Answer:
The inner core
Explanation:
Well, Jaron's tunneling machine would find it quite impossible to even penetrate the crust.
Our dynamic earth is arranged in concentric layers with each shell at varrying physical state and chemical properties.
As we go down the earth, the temperature and pressure increases significantly. The innermost layer of the erth is the inner core and it is expected that the temperature and pressure here should be the greatest. The pressure in the inner core is so great that the materials that were supposed to be in molten form exists as solid in there.
Answer:The inner core
Explanation:
Taglines Definition: Example:
ILL GIVE BRAINLIEST
Answer:
Definition: a catchphrase or slogan, especially as used in advertising, or the punchline of a joke
EX: Walmart's tagline – Save money. Live better.
A tagline is a memorable phrase used in advertising or promotion that encapsulates the essence of what it's promoting. For instance, Nike's 'Just Do It' is an example of a tagline.
A tagline is a catchphrase or a slogan that is used to advertise or promote a product, service, or entity, such as a company, brand, movie, book, or campaign. These brief, memorable phrases aim to leave a lasting impression on the consumer, often encapsulating the essence of what they're promoting.
Example of a Tagline:
An example of a well-known tagline is 'Just Do It' by Nike. This simple yet powerful message encourages people to take action and emphasizes the brand's association with determination, resilience, and achievement in sports and life.
The mountain peaks shown below were initially formed millions of years ago through the processes of folding, faulting, and overthrusting. Image courtesy of the U.S. NPS Over the past several million years, these peaks have been gradually worn down. If not for the process of _______ carrying small bits of sediment away, the peaks above might be 1,000 meters taller. A. erosion B. chemical weathering C. deposition D. physical weathering
Answer:
A. Erosion
Explanation:
Erosion is the process in which soil and rock are worn away and transported by wind or water and transported to another location.
The image below shows how water has eroded a coastline.
B is wrong. Chemical weathering is the disintegration of rocks by reactions with water and the acids dissolved in it
C is wrong. Deposition is the process in which sediments carried by wind, water or ice are deposited at another location.
D is wrong. Physical weathering is the breakdown of rocks and soil by physical processes like the freezing of ice in the cracks of rocks.
erosion is the answer
how many significant figures are in the measurement 40,500 mg?
a) two
b) three
c) four
d) five
b) three
this is because all integers are sig figs, and all numbers between integers are sig figs. This makes the 40,5 part of 40,500 significant. Place holder zeroes that are not after a decimal are not significant, so the last two zeroes of the number are not significant.
The correct option to the question is option (b).
To find:
Number of significant figures = ?
Significant figures are defined as the figures that are present in a number. It expresses the magnitude of a quantity to a specific degree of accuracy.
Some rules to detect the significant figures in a number are as follows:
All digits ranging from 1 to 9 are always considered significant.Every non-zero number is always considered significant.All zero’s that are present between the integers is always considered significant.All zero’s preceding the first integer is never considered significant.All zeros that are present after the decimal point are always significant.It is evident from the given measurement that the digits '4', '0', and '5' are only significant and the last two zeroes do not have any significance.
Thus, the correct option is option (b).
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what is the density of a 10 kg mass of water when 1 kg mass of water has a density of 1 g/cm3
Answer:
The same density is an intrinsic property. A property that that does not depend on the amount.
Explanation:
The density of this 10 kg mass of water is [tex]10 \;g/cm^3[/tex]
Let the first water be A.Let the second water be B.Given the following data:
Mass of A = 10 kgMass of B = 1 kgDensity of B = [tex]1 \;g/cm^3[/tex]To find the density of A;
First of all, we would find the volume for this density.
[tex]Volume = \frac{Mass}{Density}\\\\Volume = \frac{1}{1}\\\\Volume = 1 \;cm^3[/tex]
Now, we can find the density of A;
[tex]Density = \frac{10}{1}[/tex]
Density of A = [tex]10 \;g/cm^3[/tex]
Therefore, the density of this 10 kg mass of water is [tex]10 \;g/cm^3[/tex]
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What two properties of a gas depend on its container?
One property is it's volume. I am not sure if the second
Answer:
Volume and pressure.
Explanation:
The gases represent the physical state of matter whose values of volume, density or shape are not defined. They have a high degree of disorder caused by the free displacement of the particles that make them up (atoms, molecules or ions - usually molecules) and are objects of study because they have great applicability in everyday life, and because they are the material layer in which we keep most contact, after all, normally our whole body is in contact with gases (atmospheric air).
The properties of the gases are variable, that is, because there are certain and specific spaces between their constituents (which can increase or decrease) the volume, density, pressure, viscosity can be changed. The smaller the container in which the gas is containing, the smaller its volume and the higher its pressure, for example.
How does a sample of water at 38 °C compare to a sample of water at 295 K? The water at 38 °C has a lower average kinetic energy than the sample at 295 K. The water at 38 °C has faster-moving molecules than the sample at 295 K. The water at 38 °C has greater nuclear energy than the sample at 295 K. The water at 38 °C has larger molecules than the sample at 295 K.
The correct statement is: "The water at 38 °C has faster-moving molecules than the sample at 295 K."
Temperature is a measure of the average kinetic energy of molecules in a substance. The Kelvin scale directly measures this kinetic energy, so 295 K represents a certain average kinetic energy.
However, 38 °C is equivalent to 311 K, which means the water molecules at this temperature have higher average kinetic energy. Since kinetic energy is directly related to the speed of molecules, water at 38 °C has faster-moving molecules compared to water at 295 K.
This is because at higher temperatures, molecules possess greater kinetic energy, resulting in faster movement.
Therefore, the statement accurately describes the comparison between the two samples of water.
Define inference and explain how it is used to form conclusions
4. the number that indicates the number of protons in the atoms
Answer:electrons indicates to the no of protons because they are same in number.
Explanation:
Magnesium bromide is a binary ionic compound. From its formula, MgBr2, how do you know that
Mg is the metal?
Answer: Magnesium loses electrons to form [tex]Mg^{2+}[/tex]
Explanation:
An ionic bond is formed when an element completely transfers its valence electron to another element. Metals donate the electron and forms a positively charged ion called as cation. Non metals accept the electrons and forms a negatively charged ion called as anion.
Electronic configuration of magnesium:
[tex][Mg]:12: 1s^22s^22p^63s^2[/tex]
Magnesium atom will loose one electron to gain noble gas configuration and form magnesium cation with +2 charge.
[tex][Mg^{2+}]:10:1s^22s^22p^63s^0[/tex]
Electronic configuration of bromine
[tex][Br]:35:1s^22s^22p^63s^23p^64s^23d^{10}4p^5[/tex]
Bromine atom will gain one electron to gain noble gas configuration and form bromide ion with -1 charge.
[tex][Br^-]=1s^22s^22p^63s^23p^64s^23d^{10}4p^6[/tex]
Thus as magnesium forms a cation , it is the metal.
If you added 15,000 calories to 2.0 L of water that was at 25.0 degrees C, what temperature would it be at when you finished?
Answer:
When we finish, the temperature would be 32.5℃
Explanation:
Density of water = mass/volume
So,
Mass of water = Density × Volume
[tex]\\\\$=1.0 \times 2.0 L$\\\\$=1.0 \frac{g}{m L} \times 2000 m L$\\\\$\quad=2000 g$[/tex]
[tex]$Q=m \times c \times \Delta T$[/tex]
where
[tex]\Delta T[/tex] = Final T - Initial T
Q is the heat energy in calories
c is the specific heat capacity (for water 1.0 cal/(g℃))
m is the mass of water
plugging in the values
[tex]$15000 \mathrm{Cal}=2000 \mathrm{g} \times 1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times \Delta T$[/tex]
[tex]\\$\Delta T=\frac{15000 \mathrm{cal}}{2000 \mathrm{g} \times \frac{1.0 \mathrm{cal}}{g^{\circ} \mathrm{C}}}$\\\\$\Delta T=7.5^{\circ} \mathrm{C}$[/tex]
Final T = ∆T + Initial T
= 7.5℃ + 25℃ = 32.5℃ (Answer).
Which answer choices are true statements about the properties of an enclosed gas?
Select all that apply.
If the temperature of a gas remains constant, then increasing its volume will decrease its pressure.
If the volume of a gas remains constant, then increasing its temperature will increase its pressure.
If the pressure of a gas remains constant, then increasing its temperature will increase its volume.
If the temperature of a gas remains constant, then increasing its volume will increase its pressure
Answer:
option 1:
True
option 2:
True
option 3:
True
option 4:
False
Explanation:
we know from ideal gas equation that
[tex]PV=nRT[/tex]
or
[tex]\frac{PV}{T}=Constant[/tex]..............(1)
option 1:
True
Explanation
From equation 1 it is clear that if temperature remains constant than on increasing the volume of gas, pressure of gas will get decreases.
Option-2
True:
Explanation
From equation 1 it is clear that if volume of gas remains constant then on increasing the temperature, pressure of gas will increases.
Option-3
True
Explanation:
From equation 1 it is clear that if pressure of gas remains constant then on increasing the temperature volume of gas will increases.
Option-4
False
Explanation:
From equation 1 it is clear that if temperature of gas remains constant then on increasing the volume of gas, pressure of gas will decreases.
Three out of the four statements given align with the Gas Laws: Boyle's Law, Charles's Law, and Gay-Lussac's Law, respectively. The incorrect statement contradicts Boyle's Law.
Explanation:Your question relates to the behavior of an enclosed gas under various conditions. This is governed by the Gas Laws, which state:
If the temperature of a gas remains constant (an isothermal process), then increasing its volume will decrease its pressure. This is known as Boyle's Law. If the volume of a gas remains constant, then increasing its temperature will increase its pressure. This is described by Charles's Law. If the pressure of a gas remains constant, then increasing its temperature will increase its volume. This is the essence of Gay-Lussac's Law.Therefore, the last statement is incorrect: If the temperature of a gas remains constant, increasing its volume will not increase its pressure - it will decrease it, according to Boyle's Law.
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A substance that conducts electricity, is malleable, ductile, and has luster would be classified as a
Answer:
A substance that conducts electricity, is malleable, ductile, and has luster would be classified as a metal.
Explanation:
Metal can be defined as the statement above or according to its position in the periodic table. Over there they can be classified as: rare earth metals, transition metals, alkaline earth metals or alkali metals. An example of a metal is the iron.
Metals conduct electrivity and heat wonderfully. They are malleable, wich means they can be changed its shape or hammered into sheets. They are ductile too, which means they can be drawn into wires.
Which event is most likely occurring?
Answer: effusion of gas particles
Answer:
The correct answer is "effusion".
Explanation:
In chemistry, effusion is defined as the movement of gas particles trough a small hole from an area to another. This event is what most likely is occurring in the figure, where the red dots inside the container represent gas particles, the green circle is a barrier and the white dot at the middle represent the small hole that the gas particles go trough during the effusion process.
The potential energy on a spring is proportional to the square of which of these quantities
Final answer:
The potential energy stored in a spring is proportional to the square of the displacement (x) from its undeformed position, as expressed by the formula PE_s = ½ kx².
Explanation:
The potential energy on a spring is proportional to the square of the displacement (x) from its undeformed position. When a spring is stretched or compressed by a distance x, the work done is stored as potential energy. This energy can be expressed by the formula PE_s = ½ kx², where k is the spring's force constant. At maximum compression or stretch, all the energy in the spring is potential, and when the spring passes through the equilibrium point, it possesses kinetic energy, which is also proportionate to the square of the amplitude of the motion.
the pressure of a gas constant temperature is increased by a factor od 4 by what factor does the volume change
1/4
1/2
1
4
Answer:
[tex]\frac{1}{4}[/tex]
Explanation:
From the given problem, we are to find the factor number by which the volume of the compressed gas has changed through.
We apply Boyle's law to this problem because the condition of the reaction stipulates a constant temperature.
Boyle's law states "the volume of a given mass of gas is inversely proportional to its pressure provided that temperature remains constant". Mathematically, it is expressed as:
P₁V₁ = P₂V₂
P₁ is initial pressure on the gas
V₁ is the initial volume of the gas
P₂ is the final pressure of the gas
V₂ is the final volume of the gas
From the problem, we are to find the factor through which the volume changed:
P₁V₁ = P₂V₂
V₂ = [tex]\frac{P_{1} }{P_{2} } V_{1}[/tex]
Now:
P₁ = P₁
P₂ = 4P₁
V₂ = [tex]\frac{P_{1} }{4P_{1} } V_{1}[/tex]
Therefore, the factor of the volume change is [tex]\frac{1}{4}[/tex]
The study of chemicals and bonds is called chemistry.
The correct answer is option A which is 1/4.
What is ideal gas law?The ideal gas law, also called the general gas equation, is the equation of the state of a hypothetical ideal gas. It is a good approximation of the behavior of many gases under many conditions, although it has several limitationsFrom the given problem, we are to find the factor number by which the volume of the compressed gas has changed. We apply Boyle's law to this problem because the condition of the reaction stipulates a constant temperature.
Boyle's law states "the volume of a given mass of gas is inversely proportional to its pressure provided that temperature remains constant". Mathematically, it is expressed as:
P₁V₁ = P₂V₂
Where
P₁ is initial pressure on the gasV₁ is the initial volume of the gasP₂ is the final pressure of the gasV₂ is the final volume of the gasFrom the problem, we are to find the factor through which the volume changed:
P₁V₁ = P₂V₂
V₂ = [tex]\frac{P_1}{P_2}*V_1[/tex]
Now:
P₁ = P₁
P₂ = 4P₁
Hence
V₂ = [tex]\frac{P_1}{4P_2}*V_1[/tex]
Therefore, the factor of the volume change is 1/4.
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What is the frequency of light with an energy of 124 kJ/mol?
Answer: = 3.11 x 10^14 s^-1
Explanation:
Use the formula E = hv
This formula uses the assumption that the unit for energy is in Joules/photon.
124 kJ = 124000J
To get 124000J/mol into a unit of J/photons, we need to divide by the number of photons in a mole, which is 6.022 x 10^23.
And thus, we need
124000/6.022 x 10^23 = 2.06 x 10^-19J/photon
We can plug it in to E = hv by
2.06 x 10^-19J = (6.63 x 10^-34 J s)(v) Isolate v by
v = (2.06 x 10^-19J)/(6.63 x 10^-34 J s)
= 3.11 x 10^14 s^-1
Select all the correct answers.
Researchers are studying possible ways to use the process of nuclear fusion to generate electricity. In what ways would fusion be better than fission for use in power plants?
1._The fuel used for fusion is abundant in nature and easy to obtain.
2._Fusion occurs at ordinary temperatures and pressures.
3._The fusion process doesn’t require an energy input.
4._Fusion has fewer safety risks than fission.
5._Fusion doesn’t produce radioactive waste products.
Answer:
it is The fuel used for fusion is abundant in nature and easy to obtain and The fusion process doesn’t require an energy input ans Fusion has fewer safety risks than fission. and Fusion doesn’t produce radioactive waste products.
Explanation:
Answer:
The correct answer is option 5.
Explanation:
The process of nuclear fission takes place due to the dissociation of heavy atoms into lighter atoms, generating high energy particles in the procedure like alpha, neutrons, and beta particles. On the other hand, the process of nuclear fusion takes place by combining lighter atoms into heavier atoms generating very less radioactive constituents.
In the process of nuclear fusion, there are also lesser chances of a meltdown of a fusion reaction in comparison to a fission reaction, thus, minimizing the occurrences of an accident. The process of nuclear fusion is better in comparison to nuclear fission in generating electricity in power plants as fusion processes do not generate radioactive waste components.
In the process of nuclear fission, one projectile is required to hit the heavy element nucleus, and the reaction cannot be stopped and always generate radioactive elements as the side component. While in nuclear fusion an enormous amount of heat is required. The reaction can be stopped readily and the eventual component produced is not radioactive in nature, that is, environment-friendly.
For the following aqueous reaction, complete and balance the molecular equation and write a net iconic equatio, making sure to include the physical states of the compounds:
Potassium carbonate + Strontium nitrate
Answer:
Balance molecular equation:
K2CO3(aq) + Sr(NO3)2(aq) → SrCO3(s) + 2KNO3(aq)
Net ionic equation:
CO3∧-2(aq) + Sr∧+2(aq) → SrCO3(s)
Explanation:
Potassium carbonate = K2CO3
Strontium nitrate = Sr(NO3)2
Chemical equation:
K2CO3 + Sr(NO3)2 → SrCO3 + KNO3
Balance chemical equation with physical states:
K2CO3(aq) + Sr(NO3)2(aq) → SrCO3(s) + 2KNO3(aq)
Ionic equation:
2K+(aq) + CO3∧-2(aq) + Sr∧+2(aq) + 2NO∧-3(aq) → SrCO3(s) + 2K+(aq) + 2NO∧-3(aq)
Net ionic equation:
CO3∧-2(aq) + Sr∧+2(aq) → SrCO3(s)
2K+ and 2NO∧-3 ions are spectator ions that's way these are not written in net ionic equation.
Spectator ions:
These are the ions that are present same on both side of chemical reaction and does not effect the equilibrium.
The molecular equation for the reaction between potassium carbonate and strontium nitrate is K2CO3 (aq) + Sr(NO3)2 (aq) → 2KNO3 (aq) + SrCO3 (s). The complete ionic equation is 2K+ (aq) + CO3^2- (aq) + Sr^2+ (aq) + 2NO3^- (aq) → 2K+ (aq) + 2NO3^- (aq) + SrCO3 (s). The net ionic equation is CO3^2- (aq) + Sr^2+ (aq) → SrCO3 (s).
Explanation:The molecular equation for the reaction between potassium carbonate and strontium nitrate is:
K2CO3 (aq) + Sr(NO3)2 (aq) → 2KNO3 (aq) + SrCO3 (s)
The complete ionic equation for the reaction is:
2K+ (aq) + CO32- (aq) + Sr2+ (aq) + 2NO3- (aq) → 2K+ (aq) + 2NO3- (aq) + SrCO3 (s)
The net ionic equation for the reaction is:
CO32- (aq) + Sr2+ (aq) → SrCO3 (s)
Write a balanced chemical equation for the reaction of copper(II) sulfate and concentrated ammonia to produce teramine copper(II) sulfate.
The balanced chemical equation is CuSO4 + 4NH3 -> [Cu(NH3)4]SO4.
Explanation:The balanced chemical equation for the reaction of copper(II) sulfate and concentrated ammonia to produce teramine copper(II) sulfate is:
CuSO4 + 4NH3 → [Cu(NH3)4]SO4
In this reaction, copper(II) sulfate (CuSO4) reacts with concentrated ammonia (NH3) to produce teramine copper(II) sulfate. The reaction forms a complex compound with the coordination number of copper changed from 2 to 4.
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12. Why do scientists believe there could be life on Titan?
Answer:
Whether there is life on Titan, the largest moon of Saturn, is at present an open question and a topic of scientific assessment and research. Titan is far colder than Earth, and its surface lacks stable liquid water, factors which have led some scientists to consider life there unlikely.
Explanation:
what is a biotic factor in an ecosystem
During Trial 2, what allowed you to determine that aluminum was the limiting reactant? Check all that
apply.
All of the copper dissolved.
All of the aluminum dissolved.
The solution turned clear.
The number of grams of copper(II) chloride used in the reaction was greater than the number of
grams of aluminum.
The molar ratio of copper(II) chloride to aluminum was greater than 3:2, the equation's molar ratio.
Answer:
b & e
Explanation:
Answer:
B and E
Explanation:
On Edge 2021
After recording the data for five repeated trials you should calculate the average of five values and report that average in your lab report
Answer:
The statement given is true.
Explanation:
When we conduct an experiment we have to record the outcomes and maintain a log so that we can know number for later purposes, where the experiment is going and what conclusions we can expect.
To get the final answer or number the five outcomes that have been recorded here have to be averaged to get one value, this value would show where the outcome’s value will lie.
In a value, any non-zero digit is considered a significant digit. (Zeroes may or may not be significant.) What is the minimum number of significant digits in 828,000,000
Answer:
The minimum number of significant digits in 828,000,000 is 3.
Explanation:
This is because there are 3 non-zero digits that are considered significant.
The minimum number of significant digits in 828,000,000 is three.
Significant digitsIn the given number, all non-zero digits (8, 2, and 8) are considered significant digits. The zeroes in this case are placeholders and do not contribute to the number's significant digits.
Therefore, the minimum number of significant digits in 828,000,000 is three, as it is determined by the count of non-zero digits in the number.
This explanation emphasizes the rules for identifying significant digits in a value, focusing on the actual non-zero digits that convey meaningful information.
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One of the compounds used to increase the octane rating of gasoline is toluene (pictured). Suppose 43.3 mL of toluene (d = 0.867 g/mL) is consumed when a sample of gasoline burns in air. How many grams of oxygen are needed for complete combustion of the toluene? (a) How many grams of oxygen are needed for complete combustion of the toluene? g (b) How many total moles of gaseous products form? mol (c) How many molecules of water vapor form?
Answer:
(A)
Density = Mass / Volume
So
Mass = Density × Volume
[tex]= 0.867 g/mL \times 43.3mL = 37.5411 g Toluene[/tex]
[tex]1C_6 H_5 CH_3 + 9 O_2 > 7 CO_2 + 4 H_2 O[/tex]
Mole ratio of toluene : Oxygen is 1 : 9
[tex]$37.5411 g \text { Toluene } \times \frac{1 \text {mol} \text {toluene}}{92 g \text { toluene}} \times \frac{9 {mol} O_{2}}{1 \text {mol} \text { toluene }} \times \frac{32 g O_{2}}{1 {mol} O_{2}}=117 g O_{2}(\text {Answer})$[/tex]
(B)
1 mole of Toluene produces 7 moles of [tex]CO_2[/tex] gas and 4 moles of [tex]H_2 O[/tex] Vapour
So the mole ratio is 1 : 11
[tex]37.5411 g Toluene $\times \frac{1 \text { mol toluene }}{92 g \text { toluene }} \times \frac{11 \mathrm{mol} \text { gas }}{1 \text { mol toluene }} $$\\\\=4.49 \text { mol gaseous products (Answer) } $[/tex]
(C)
1mole contains [tex]6.022\times10^{23}[/tex] molecules
[tex]37.5411 g Toluene $\times \frac{1 \text { mol toluene }}{92 g \text { toluene}} \times \frac{4 \mathrm{mol} \mathrm{H}_{2} \mathrm{O}}{1 \mathrm{mol} \text { toluene }} \times \frac{6.022 \times 10^{23} \text { molecules } \mathrm{H}_{2} \mathrm{O}}{1 \mathrm{mol} \mathrm{H}_{2} \mathrm{O}} $\\\\$=9.82 \times 10^{23} \text { molecules } \mathrm{H}_{2} \mathrm{O} \text { (Answer) } $[/tex]
A. The mass of oxygen needed for complete combustion of the toluene is 117.52 g.
B. The total mole of gaseous products formed is 4.488 moles
C. The number of molecules of water vapor formed is 9.82×10²³ molecules
We'll begin by calculating the mass of toluene. This can be obtained as follow:
Volume = 43.3 mL
Density = 0.867 g/mL
Mass of toluene =?Mass = Density × Volume
Mass of toluene = 0.867 × 43.3
Mass of toluene = 37.5411 gNext, we shall write the balanced equation for the reaction. C₆H₅CH₃ + 9O₂ —> 7CO₂ + 4H₂ONext, we shall determine the masses of C₆H₅CH₃ and O₂ that reacted from the balanced equationC₆H₅CH₃ + 9O₂ —> 7CO₂ + 4H₂O
Molar mass of C₆H₅CH₃ = (6×12) + (1×5) + 12 + (3×1) = 92 g/mol
Mass of C₆H₅CH₃ from the balanced equation = 1 × 92 = 92 g
Molar mass of O₂ = 2 × 16 = 32 g/mol
Mass of O₂ from the balanced equation = 9 × 32 = 288 g
SUMMARY:
From the balanced equation above,
92 g of C₆H₅CH₃ reacted with 288 g of O₂
A. Determination of the mass of O₂ needed for the complete combustion of the toluene
From the balanced equation above,
92 g of C₆H₅CH₃ reacted with 288 g of O₂.
Therefore,
37.5411 g of C₆H₅CH₃ will react with = (37.5411 × 288)/92 = 117.52 g of O₂
Thus, 117.52 g of O₂ is needed for the reaction.
B. Determination of the total number of mole of the gaseous products formed
We'll begin by calculating the number of mole of in 37.5411 g of C₆H₅CH₃Molar mass of C₆H₅CH₃ = 92 g/mol
Mass of C₆H₅CH₃ = 37.5411 g
Mole of C₆H₅CH₃ =?Mole = mass / molar mass
Mole of C₆H₅CH₃ = 37.5411 / 92
Mole of C₆H₅CH₃ = 0.408 mole Next, we shall determine the mole of CO₂ produced.C₆H₅CH₃ + 9O₂ —> 7CO₂ + 4H₂O
From the balanced equation above,
1 mole of C₆H₅CH₃ produced 7 moles of CO₂
Therefore,
0.408 mole of C₆H₅CH₃ will produce = 0.408 × 7 = 2.856 moles of CO₂
Next, we shall determine the mole of H₂O produced.C₆H₅CH₃ + 9O₂ —> 7CO₂ + 4H₂O
From the balanced equation above,
1 mole of C₆H₅CH₃ produced 4 moles of H₂O
Therefore,
0.408 mole of C₆H₅CH₃ will produce = 0.408 × 4 = 1.632 moles of H₂O
Finally, we shall determine the total moles of the gaseous productsMole of CO₂ produced = 2.856 moles
Mole of H₂O produced = 1.632 moles
Total mole = 2.856 + 1.632
Total mole = 4.488 molesTherefore, the total number of mole of the gaseous products formed is 4.488 moles
C. Determination of the number of molecules of water vapor formed.
From Avogadro's hypothesis,
1 mole of water = 6.02×10²³ molecules
Therefore,
1.632 moles of water = 1.632 × 6.02×10²³
1.632 moles of water = 9.82×10²³ molecules
Thus, the number of molecules of water vapor formed is 9.82×10²³ molecules
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The sink-float method is often used to identify the type of glass material found at crime scenes by determining its density.
Several different types of glass of known density are placed into solutions of varying densities. Determine whether each glass
piece will sink, float, or do neither when immersed in the given solution.
Glass that will sink
Glass that will float
Glass that will not sink or float
alkali zinc borosilicate with a density of
2.57 g/mL in a solution with a density
of 2.46 g/mL
soda borosilicate with a density of 2.27 g/mL
in a solution with a density of 2.62 g/mL
alkali strontium with a density of 2.26 g/mL in
a solution with a density of 2.34 g/mL
potash borosilicate with a density of
2.16 g/mL in a solution with a density
of 2.16 g/mL
potash soda lead with a density of 3.05 g/mL
in a solution with a density of 1.65 g/mL
Answer Bank
terms of use
contac
Answer:
Glass that will sink
alkali zinc borosilicate with a density of 2.57 g/mL in a solution with a density of 2.46 g/mLpotash soda lead with a density of 3.05 g/mL in a solution with a density of 1.65 g/mLGlass that will float
soda borosilicate with a density of 2.27 g/mL in a solution with a density of 2.62 g/mLalkali strontium with a density of 2.26 g/mL in a solution with a density of 2.34 g/mLGlass that will not sink or float
potash borosilicate with a density of 2.16 g/mL in a solution with a density of 2.16 g/mLExplanation:
Density is the property of matter that states the ratio of the amount of matter, its mass, to the space occupied by it, its volume.
So, the mathematical expression for the density is:
density = mass / volumeBy comparing the density of a material with the density of a liquid, you will be able to determine whether object will float, sink, or do neither when immersed in the liquid.
The greater the density of an object the more it will try to sink in the liquid.
As you must have experienced many times an inflatable ball (whose density is very low) will float in water, but a stone (whose denisty is greater) will sink in water.
The flotation condition may be summarized by:
When the density of the object < density of the liquid, the object will floatWhen the density of the object = density of the liquid: the object will neither float nor sinkWhen the density of the object > density of the liquid: the object will sink.Glass that will sink
alkali zinc borosilicate with a density of 2.57 g/mL in a solution with a density of 2.46 g/mL, because 2.57 > 2.46.potash soda lead with a density of 3.05 g/mL in a solution with a density of 1.65 g/mL, because 3.05 > 1.65.Glass that will float
soda borosilicate with a density of 2.27 g/mL in a solution with a density of 2.62 g/mL, because 2.27 < 2.62.alkali strontium with a density of 2.26 g/mL in a solution with a density of 2.34 g/mL, because 2.26 < 2.34.Glass that will not sink or float
potash borosilicate with a density of 2.16 g/mL in a solution with a density of 2.16 g/mL, because 2.16 = 2.16The sink-float method is used to identify the type of glass by determining its density. Glass with higher density sinks, glass with lower density floats, and glass with equal density neither sinks nor floats. The given examples demonstrate different outcomes based on the densities of the glass and the solutions.
Explanation:The sink-float method is commonly used to identify the type of glass by determining its density. If the density of the glass is higher than the density of the solution it is immersed in, it will sink. If the density of the glass is lower than the density of the solution, it will float. If the density of the glass is equal to the density of the solution, it will neither sink nor float but stay suspended in the solution.
In the given examples:
The alkali zinc borosilicate with a density of 2.57 g/mL will sink in a solution with a density of 2.46 g/mL.The soda borosilicate with a density of 2.27 g/mL will float in a solution with a density of 2.62 g/mL.The alkali strontium with a density of 2.26 g/mL will neither sink nor float in a solution with a density of 2.34 g/mL.The potash borosilicate with a density of 2.16 g/mL will neither sink nor float in a solution with a density of 2.16 g/mL.The potash soda lead with a density of 3.05 g/mL will sink in a solution with a density of 1.65 g/mL.The term "precision" BEST refers to which of the following?
A) whether or not a measurement is correct
B) how “close together” a seat of measurements is
C) whether or not a tool for making measurements is useful
D) how close a measurement is to an accepted value for measurement
Answer:
A.
Explanation:
the term precision refers to something that is has the most quality or good condition, being precise and exact.
Answer: The answer is B
Explanation:
This is because precision refers to how close two or more measurements are to each other.
what does the word atomos mean and why is it not an accurate name
He named the atom after the Greek word atomos, which means 'that which can't be split.'
The word 'atomos' means 'indivisible' in Ancient Greek, but modern science has shown that atoms can be divided into smaller subatomic particles. Despite this, the term 'atom' is still used today.
What is the mass in grams of 16.3 mol of the element
nickel, Ni?
Answer:
The mass of 16.3 moles of nickel is 956. 647 g.
Explanation:
Given data:
moles of nickel = 16.3 mol
molar mass of nickel = 58.69 g/mol
mass in gram = ?
solution:
Formula:
number of moles = mass / molar mass
mass = number of moles × molar mass
mass = 16.3 mol × 58.69 g/mol
mass= 956. 647 g
To find the mass of 16.3 mol of nickel, multiply the number of moles by the molar mass of nickel, 58.693 g/mol, resulting in a mass of 956.9 grams.
Explanation:To find the mass in grams of 16.3 mol of the element nickel (Ni), you need to use the element's molar mass. As identified in the information provided, the molar mass of nickel is 58.693 g/mol. Applying this molar mass to the given number of moles (16.3 mol), you can calculate the mass as follows:
Mass = number of moles × molar mass
Mass = 16.3 mol × 58.693 g/mol
Mass = 956.8969 g
Therefore, the mass of 16.3 mol of nickel is 956.9 grams (rounded to one decimal place).
What evidence is there that electrons move around in definite pathways around the
nucleus?
What evidence is there that electrons m
Answer:
Absorption and emission spectra
Explanation:
This is occurs when an atom either absorbs or emits energy when bombarded by a source.
Neils Bohr predicted that electrons moves round in the atom in distinct orbitals according to their energy. An electron in its ground state can become excited if it gains sufficient energy which surpasses that of its ground state configuration. An atom can also move from higher energy levels to lower ones. During the descent, energy is given off in form of emission spectra.
Absorption occurs when electrons in an atom absorbs energy from incoming radiation and they re-radiate it in all directions. This is given off as a spectra and can be observed for such electron.
Final answer:
Quantum mechanics replaced the idea of electrons moving in fixed orbits with the concept of orbitals, where electrons have a high probability of being found. Evidence for this includes distinct atomic spectra and quantum numbers that match experimental data.
Explanation:
The question about the behavior of electrons around the nucleus is a fundamental concept in chemistry and physics. The early model by Niels Bohr suggested that electrons move in definite circular paths or orbits around the nucleus, akin to planets orbiting the sun. However, this model was succeeded by quantum mechanics, which describes electron behavior as a set of probabilities rather than definite paths.
Quantum mechanics introduced the concept of electron orbitals, which describe regions of space around the nucleus where there is a high probability of finding an electron. One piece of experimental evidence is the atomic spectra, which show distinct lines corresponding to electrons moving between energy levels in an atom. This indicates that electrons occupy specific energy states rather than moving randomly.
Another supporting evidence comes from quantum numbers, which describe the properties of electron orbitals and help explain the arrangement of electrons in atoms. These quantum numbers arise naturally from the equations of quantum mechanics and match a vast array of experimental data.