Answer:
3) 2000 times the mass of an electron and a unit positive charge
Explanation:
The proton is approximately 2000 times massive than electron.
Neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.
Symbol of proton= P+
Symbol of neutron= n0
Mass of proton=1.672623×10-27 Kg
Mass of neutron=1.674929×10-27 Kg
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.
Symbol= e-
Mass= 9.10938356×10-31 Kg
It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.
A hydrated form of copper sulfate (CuSO4⋅xH2O) is heated to drive off all of the water. If there is initially 9.42g of hydrated salt and there is 5.26g of anhydrous CuSO4 after heating, find the number of water molecules associated with each CuSO4 formula unit.
Answer:
CuSO₄. 7 H₂O
Explanation:
Given data:
Mass of anhydrous CuSO₄ = 5.26 g
Mass of hydrated CuSO₄ = 9.42 g
Number of water molecules associated with CuSO₄ = ?
Solution:
Mass of water = 9.42 g - 5.26 g = 4.16 g
Number of moles of water = mass/ molar mass
Number of moles of water = 4.16 g/ 18 g/mol
Number of moles of water = 0.23 mol
Number of moles of CuSO₄:
Number of moles = mass/ molar mass
Number of moles = 5.26 g/ 159.61 g/mol
Number of moles = 0.033 mol
Number of moles of water per mole of CuSO₄:
Number of moles of water/ number of moles of CuSO₄
0.23 mol/ 0.033 mol
7 moles
CuSO₄. 7 H₂O
please please please help 12 points !!!
Fission is the process where nuclei:
Split to form smaller nuclei.
Fusion is the process where nuclei:
Combine to form larger nuclei.
A easy way to remember which is which is by remembering that to fuse two things together is to combine them to make a single entity, and fusion is the process of fusing nuclei together. And if you know that, then you will know that fission is the process of splitting nuclei.
Fusion: Combine
Fission: Split
I hope this helps. Let me know if you have any questions or if anything confuses you. :)
I. Determine the mass of reactants and products that will be needed if one mole of P4(s) reacts completely, as follows
P4(s) + 6 H2(g) →4 PH3(g)
II. What is the total mass of the reactants? What is the mass of the products?
III. What principle is illustrated by this example?
If someone could really help me with explanation as well thank you very much
Answer:
I. Reagents:
P₄= 123.88 g
H₂ = 12 g
Products:
PH₃= 135.88g
II. Total reagents = 135.88 g
Total products = 135.88 g
III. The principle of conservation of mass
Explanation:
I. First, the molar masses of all reagents and all reaction products are calculated:
• mP₄ = 4 x mP = 4 x 30.97g = 123.88 g / mol
• mH₂ = 2 x mH = 2 x 1.00g = 2 g / mol
• mPH₃ = 4 x mH + m P = 3 x 1.00g + 30.97g = 33.97 g / mol
Having the equation balanced, it can be seen that in order for one mole to react completely of P₄, 6 moles of H₂ must react, and 4 moles of PH₃ will be produced. With the molar masses, we obtain the reacting masses of each reagent and the mass of product that is formed:
Reagents:
P₄: 1 mol ≡ 123.88 g
H₂: 6 moles ≡ 12 g
Products:
PH₃: 4 moles ≡135.88g
II. We add the total mass of the reagents:
Total reagents = mP₄ + mH₂ = 123.88 g + 12 g = 135.88 g
As the reaction product is only PH₃, the total mass of products is 135.88 g
III. It is seen that the mass of reagents necessary to produce the reaction is equal to the mass of product obtained. Therefore, the principle illustrated with this example is the principle of conservation of mass, it says that “In an isolated system, during any ordinary chemical reaction, the total mass in the system remains constant, that is, the mass Consumption of reagents is equal to the mass of the products obtained ”
The mass of reactants (P4 and H2) and product (PH3) is calculated using their molar masses. The reactants have a total mass of 136 g and the product also has a total mass of 136 g, illustrating the law of conservation of mass.
Explanation:The chemical equation given is P4(s) + 6 H2(g) → 4 PH3(g). This equation tells us that one mole of P4 reacts with 6 moles of H2 to produce 4 moles of PH3.
Firstly, we need to find the molar masses of P4, H2, and PH3. Using the atomic mass of Phosphorus (P) = 31 g/mol and Hydrogen (H) = 1 g/mol, the molar mass of P4 would be 4*31 = 124 g/mol. The molar mass of H2 = 2*1 = 2 g/mol. And the molar mass of PH3 = 31 + 1*3 = 34 g/mol.
Then we can find the total mass of reactants and products: For reactants, one mole of P4 is 124 g and six moles of H2 is 6*2 = 12 g. So, the total mass of reactants is 124+12 = 136 g. For products, four moles of PH3 would be 4*34 = 136 g.
This example illustrates the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. Thus, the total mass of the reactants is equal to the total mass of the products.
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pls answer
Maria is baking cookies. She mixes water, flour, sugar, baking powder, butter and chocolate chips and then measures the mass of her ingredients. The mixture has a mass of 1053 grams. Maria baked the cookies for 15 minutes and then measured the mass of the cookies and found they now had a mass of 845 grams. Why didn't the cookies obey the law of conservation of mass?
Group of answer choices
The law of conservation of mass was not obeyed since Maria did not measure the mass of all of the ingredients.
The law of conservation of mass was not obeyed since some of the mass was destroyed in the baking process.
The law of conservation of mass was obeyed since some of the mass evaporated while the cookies were baking.
The law of conservation of mass was not obeyed since some of the mass was destroyed in the oven.
Answer:
The law of conservation of mass was obeyed since some of the mass evaporated while the cookies were baking.Explanation:
The law of conservation of mass, as other physic's laws, is universal, meaning that it is obeyed in any circumstance, place, and time.
Thus, any explanation that asserts that the law of conservation of mass is not obeyed must be discarded.
Hence, first, second and fourth options are incorrect.
The law of conservation of mass states that during any physical or chemical process the mass of the substances can neither created nor destroyed; then, what happened that made the mass of the mixture of ingredients mixed by Maria (1053 g) were greater than the mass of the cookies baked for 15 minutes (845 g)?
One of the physical process that occurs when cooking, due to the increase of temperature, is the evaporation of water (besides the chemical reactions between the ingredients, some of which produce other gases).
The water in form of vapor (steam) will "escape" from the mass and the oven, so when the cookies are weighted they will weight less than the mixture, because the water was transformed from liquid state to gas state; i.e. some of the mass evaporated while the cookies were baking. Thus, the third choice is correct.
2-- What is the [H3O+] in a solution with [OH-] = 1 x 10-12 M?
Answer:
The answer is 0.01 M
Explanation:
The problem is solved by applying the expression for ionic product of water as follows:
Kw = [H₃O⁺] [OH⁻]
Where Kw is the ionic product of water and it is 1.10⁻¹⁴ M at⁴ 25ºC. As [OH⁻]= 1.10⁻¹² M, [H₃O⁺] will be:
[H₃O⁺]= Kw/ [OH⁻]= 1.10⁻¹⁴M/1.10⁻¹²M= 0.01 M
Which of the following is an example of energy causing motion?
A. bowling ball on a ball stand
B. boy holding a bowling ball
C. rolling ball scattering the bowling pins
D. Bowling pins scattered on the ground
Answer:
the answer is c
Explanation:
Answer:
C
Explanation:
The bowling ball has energy in order to to move and hits the pins causing them to scatter (motion)
Pb(NO3)2 + K2CO3 --> PbCO3 + KNO3
A. 5
B. 2
C.
4
Answer:
Pb(NO3)2 + K2CO3 ----> PbCO3 + 2KNO3
The answer is B. 2
Hope this helps!
PLEASE HELP
Refer to the reactants of this synthesis reaction.
_[blank]_Mg + _[blank]_O2 → ?
What completed equation shows the product formed?
4Mg + O2 → 2Mg2O
Mg + O2 → MgO2
2Mg + O2 → 2MgO
2Mg + O2 → Mg2O2
2 Mg + O₂ → 2 MgO
Explanation:
Metallic magnesium (Mg) will react with gaseous oxygen (O₂) to produce solid magnesium oxide (MgO).
2 Mg + O₂ → 2 MgO
To balance the chemical equation the number of atoms of each element entering the reaction have to be equal to the number of atoms of each element leaving the reaction, in order to conserve the mass.
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convert 9.78 gallons toliters
Answer:
44.46076 litres
Explanation:
Answer:
about 37.02 Liters
Explanation:
The conversion rate is about 3.785. 9.78*3.785~37.02
Acids are described as corrosive because they a. turn litmus blue. b. taste bitter. c. “eat away” at other materials. d. feel slippery.
Answer:
C
Explanation:
acids are corrosive since they tend to destroy every single thing they do get a big example is the acidic rain which tends to corrode iron sheet thus making them to appear worn out and full of rust
Answer:
It's C.
Explanation:
c: eat away at other materials.
If the chemical equation below is balanced, what number would go in front of hydrochloric acid (HCD?
_CuCl2 + H2S → _Cus + _HCI
Coefficient 2 on HCl
Balanced equation: CuCl₂ + H₂S → CuS + 2HCI
Explanation:We are required to balance the chemical equation given;
The equation is;CuCl₂ + H₂S → CuS + HCI
Balancing chemical equations involves putting appropriate coefficients on the products and reactants involved in a chemical reactions.It ensures that the number of atoms of each element is equal; on both sides of a chemical equation.In our case;
To balance the chemical equation, we put coefficients; 1, 1, 1, 2 on CuCl₂, H₂S, CuS and HCl respectively.Therefore, the balanced equation will be;CuCl₂ + H₂S → CuS + 2HCI
The equation now obeys the law of conservation of mass which requires the mass of reactants be equal to the mass of products.A mixture formed of isopropyl alcohol C,H,OH (70%) and water (30%), if you know
that the density of the mixture (at 20°C) = 0.79 g/mL, Calculate :
(1) Molar concentration.
(2) Molal concentration. (C=12 ,H=1 ,O=16 )
Answer:
(1) C C3H7OH = 9.200 M
(2) C C3H7OH = 11.647 m
Explanation:
mixture:
∴ 70% = (g C3H7OH/g mix)×100
∴ 30% = (gH2O/g mix)×100
∴ δ mix = 0.79 g/mL
assuming:
g mix = 100g = 0.100 Kg⇒ V mix = (100g)×(mL/0.79g) = 126.582 mL mix = 0.1266 L mix
⇒ g C3H7OH = 70g
⇒ g H2O = 30g
∴ Mw C3H7OH = 60.1 g/mol
∴ Mw H2O = 18 g/mol
(1) Molar concentration (M):
M ≡ mol solute/L mix⇒ C C3H7OH = ((70 g)(mol/60.1 g))/(0.1266L) = 9.200 M
(2) molal concentration (m):
m ≡ mol solute/Kg mix⇒ C C3H7OH = ((70 g)(mol/60.1g))/(0.100 Kg) = 11.647 m
1. (5) Solid nickel reacts with aqueous nitric acid (HNO3) to form aqueous nickel (III) nitrate and
hydrogen gas. Write out and balance the chemical equation, including phases.
2. (5) What type of reaction is this? Can it undergo redox? If so, write out the balanced half-
reactions
Answer:
See every answer with its explanation below
Explanation:
1. Write the molecular equation
Ni(s) + HNO₃ (aq) → Ni(NO₃)₃ (aq) + H₂(g)↑ ↑ ↑ ↑
solid nickel aqueous nitric aqueous nickel(III) hydrogen gas
acid nitrate
2. Balance the molecular equation:
2Ni(s) + 6HNO₃ (aq) → 2 Ni(NO₃)₃ (aq) + 3H₂(g)
3. Type of reaction
This is a replacement reaction because the nickle is taking the place of hydrogen in the nitric acid and the hydrogen is released. It is also a redox reaction because nickel is being oxidized and hydrogen is being reduced.
The balanced half-reactions are:
Oxidation reaction:2Ni⁰ → 2Ni³⁺ + 2×(3e⁻)
Each nickle atom loses 3 electrons increasing its oxidation state from 0 to +3.
Reduction reaction:6H⁺ + 6e⁻ → 3H₂⁰
Each H⁺ gains 1 electron reducing its oxidation state from +1 to 0.
The phenomenon of marble cancer is due to
(a) soot particles (c) fog
(b) CFCs (d) acid rain
Answer:
The phenomenon of marble cancer is due to ACID RAIN.
Explanation:
The marble corrosion is a process by which the marbles or limestone used in construction of monuments and buildings is corroded away by the acid rain. The sulphur-dioxide and nitrogen oxides present in the atmosphere undergoes certain chemical reaction causing this acid rain. These chemical in the acid rain converts the calcium present in the limestone or marble into salt.
Also, this marble cancer leads to change the appearance and color. Sometime due to over corrosion the monuments or building causes them disintegrate .Tajmahal is one of the monument affected by marble cancer. the white color of tai mahal is slowly turning into yellow due to this marble cancer.
1. What is the mass-percent of a solution that has 13.6 g of NaCl in 250.0 g of solution?
Answer:
Mass percent = 5.44 %
Explanation:
Given data:
Mass of solute (NaCl) = 13.6 g
Mass of solution = 250 g
Mass percent of solution = ?
Solution:
Formula:
Mass percent = mass of solute / mass of solution ×100
Mass percent = 13.6 g / 250 g × 100
Mass percent = 0.0544 × 100
Mass percent = 5.44 %
The mass percent of a solution containing 13.6 g of NaCl in 250.0 g of solution is 5.44%. This is calculated by dividing the mass of the solute (NaCl) by the total mass of the solution and multiplying by 100%.
Explanation:The mass percent of a solution can be calculated by dividing the mass of the solute by the total mass of the solution and then multiplying by 100%. In this case, the solute is NaCl (sodium chloride), and the mass is 13.6 g. The total mass of the solution is 250.0 g. Mass-percent = (Mass of solute / Total mass of solution) × 100% = (13.6 g / 250.0 g)× 100% = 5.44%.
Therefore, the mass percent of the solution that has 13.6 g of NaCl in 250.0 g of the solution is 5.44%.
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Which hydrocarbon is an unsaturated hydrocarbon
Final answer:
An unsaturated hydrocarbon is a hydrocarbon with one or more double or triple bonds in its carbon chain, as opposed to saturated hydrocarbons with only single bonds. Examples include alkenes and alkynes, as well as unsaturated fatty acids like Oleic acid.
Explanation:
An unsaturated hydrocarbon is a hydrocarbon that contains at least one carbon-to-carbon double bond (C=C) or triple bond (C≡C), which is less than the maximum number of hydrogen atoms possible on its carbon chain. These bonds change the geometry and properties of the molecule compared to saturated hydrocarbons, which only have single bonds. The presence of these multiple bonds characterizes alkenes, which have one or more double bonds, and alkynes, which have one or more triple bonds.
For example, Oleic acid is a type of unsaturated fatty acid that is a long-chain hydrocarbon with at least one double bond along its chain. This kind of fatty acid is found in various foods and is a part of dietary fats and oils. When comparing saturated and unsaturated fats, the unsaturated fats contain these double or triple bonds in their structure.
CI is the element symbol of Chlorine with an atomic unit of 18.
a. True
b. False
Answer:
b) False
Explanation:
CI is the element symbol of Chlorine with an atomic mass unit of 35.5 amu and atomic number 17.
That's why the given statement is false.
The elements of group 17 are called halogens. These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine.
Chlorine is present below the bromine and have following properties:
Properties of Chlorine:
1. it is greenish-yellow irritating gas.
2. its melting point is 172.2 K
3. its boiling point is 238.6 K
4. it is disinfectant and can kill the bacteria.
5. it is also used in manufacturing of paper, paints and textile industries
8. If the distance between the Earth and the Sun
were increased, which change would occur?
A) The apparent diameter of the Sun would
decrease.
B) The amount of insolation received by the
Earth would increase.
C) The time for one Earth rotation (rotation
period) would double.
D) The time for one Earth revolution (orbital
period) would decrease.
Answer:
Option C. Time for one Earth rotation would double.
Explanation:
If the distance between Earth and Sun is increased up then it will decrease the gravitational pull of the Sun and hence will increase the orbital period of the Earth and will also increase the time taken for one Earth rotation because rotation of Earth is primarily depend on the external torque from the gravity of the Sun, Moon and other celestial bodies.
The following are examples of chemical properties except ____.
Choices
the ability to burn
the ability to be crushed
the ability to react with oxygen
toxicity
The ability to be crushed is a physical property and therefore is the answer.
Answer:
the ability to be crushed
Explanation:
Chemical change are effects that is accompanied by changes in the chemical composition of a substance. When chemical changes occur the new substance are chemically different from the formal substance. A new chemical matter is usually formed after the change occur . Example of chemical changes are rusting of iron, toxicity, combustion(substance burning in the presence of oxygen), ability of substance to react with oxygen.
Physical changes are changes that does not alter the chemical composition of the new substance . Example of physical changes are steam condensing into liquid, sugar dissolving in water and crushing a solid substance. The changes are usually physical changes. The overall substance does not change in chemical composition.
What did ancient astronomers think areas of the moon called mares might be? mountains seas craters terrae
Answer: seas
Explanation:
The ancient astronomers thought the mares on the moon were seas.
Answer:
Seas!
Explanation:
My teacher told me lol
What would cause the pressure of a gas to increase?
Final answer:
The pressure of a gas can increase by adding more gas molecules, compressing the gas into a smaller volume, or raising the temperature, all of which lead to more forceful and frequent collisions between the molecules and the container walls.
Explanation:
The pressure of a gas can increase for several reasons. One primary factor is the addition of more gas molecules to a container while its volume remains constant. This increase in the number of molecules results in more frequent collisions with the container walls, thereby increasing the pressure. Similarly, when a gas is compressed into a smaller volume without changing the number of molecules, the pressure increase is due to the rise in the frequency of molecular collisions.
Another way the pressure of a gas can increase is through a rise in temperature. When the gas molecules are heated, they move faster and collide more vigorously with the container walls. This more forceful impact also increases the pressure within the container. Therefore, an increase in temperature or a decrease in volume, or an increase in the number of molecules can all lead to higher gas pressure.
The discoverer of X-rays was(blank) The discoverer of radioactivity was (blank)
Answer:
The discoverer of X-rays was Wilhelm Conrad Roentgen.
The discoverer of radioactivity was Henri Bacquerel.
Explanation:
Wilhelm Conrad Roentgen discovered X-rays in early 1895. Roentgen observed a fluorescent glow of crystals on a table near his tube when he was working with a cathode-ray tube in his laboratory, The Cathode ray tube consisted of a glass envelope with positive and negative electrodes encapsulated in it. When a high voltage was applied the air in the tube was evacuated and hence the tube produced a fluorescent glow.
Becquerel had discovered radioactivity in 1896. To study the properties of x-rays he was using naturally fluorescent minerals. He exposed potassium uranyl sulfate to sunlight and then on photographic plates wrapped in black paper, he placed this. He believed that suns's energy would be absorbed by uranium which would then produce X rays. Without any Solar energy uranium emitted radiation because the images produce in this experiment were strong and clear.
Wilhelm Conrad Roentgen discovered X-rays in 1895 while investigating the external effects from the various types of vacuum tube equipment. His discovery was a significant scientific advancement because it marked the beginning of modern medical imaging. Roentgen was awarded the first Nobel Prize in Physics in 1901 for his work. Henri Becquerel discovered radioactivity in 1896. He was working with uranium salts when he found that they emitted rays that resembled X-rays in their penetrating power. Becquerel's discovery was accidental; he had stored a photographic plate in a dark drawer with a uranium salt and found that the plate became fogged. This led to the realization that uranium was emitting some form of radiation on its own, without any external excitation. Becquerel shared the 1903 Nobel Prize in Physics with Pierre and Marie Curie for their work on radioactivity
this is a reaction And products are
Cu(s)+2AgNO3(aq)=> 2Ag(s)+Cu(NO3)2(aq)
Answer:
2Ag + Cu(NO3)2
Explanation:
A chemical reaction is represented by a chemical equation which show the reactant and products. Reactants are written on left side of arrow while products are written on right side. The number of atoms are remain same however arrangement of atoms is different on both side.
For example:
Cu(s) + 2AgNO3(aq) → 2Ag + Cu(NO3)2
In this reaction Cu and AgNO3 are reactants while Ag and Cu(NO3)2 are products.The number of atoms are same on both side however arrangement of atoms is different.
How is the modern periodic table arranged?
by increasing electronegativity
by increasing atomic number
by increase in atomic mass
by increasing ionic size
The modern periodic table is arranged by increasing atomic number, which corresponds to the number of protons in an atom. Each box represents an element and displays various details about it. The table also shows patterns and periodic trends in the properties of elements.
Explanation:The modern periodic table is primarily arranged by increasing atomic number, which directly corresponds to the number of protons in an atom. The table is composed of rows (periods) and columns(groups). Elements that share many of the same chemical properties are grouped into the same columns. As we traverse each period from left to right, a proton is added to the nucleus and an electron to the valence shell of each successive element. The trend changes as you go down a group; the number of electrons in the valence shell remains constant, while the principal quantum number increases by one each time.
Each box in the table represents an element and includes its atomic number, symbol, average atomic mass, and sometimes its name. Elements are arranged in seven horizontal rows and 18 vertical columns. Patterns in chemical properties are also observable in the periodic table. For instance, as we move down a group, the metallic character of the elements increases, signifying a periodic trend in the elements' properties.
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how does gentrification work ?
Gentrification is a process of changing the character of a neighborhood through the influx of more affluent residents and businesses. ... The gentrification process is typically the result of increasing attraction to an area by people with higher incomes spilling over from neighboring cities, towns, or neighborhoods.
Gentrification is a socio-economic process where lower-status individuals' improvements to a neighborhood attract wealthier residents, leading to increased rents and potential displacement of the original residents. This can be explained economically by the Rent Gap Theory and is influenced by various factors, including lifestyle changes and media representation.
Explanation:Gentrification is a complex process often starting when lower social status individuals invest their effort (sweat equity) into revitalizing neighborhoods. Over time, these improvements make the neighborhood more appealing to middle and upper-class residents who begin moving in. This shift can lead to a rise in rents and property values, sometimes forcing existing working-class residents out due to affordability issues, a phenomenon referred to as displacement.
Displacement is a serious downside of gentrification, where less politically powerful citizens, often including local businesses, are pushed out from their homes and commercial spaces. This is particularly true in cities without rent control laws. Gentrification is not merely a process defined by the social or racial makeup alterations, but it is multifaceted, involving cultural shifts, economic pressures, real estate investments, and sometimes, unfortunately, an increase in tensions and violence, as seen in historical events like Tompkin's Square Park Riot.
From an economic standpoint, Neil Smith's Rent Gap Theory proposes that gentrification occurs when there's a significant difference between the current value of property and its potential value post-investment. This gap attracts investors to rejuvenate rundown areas. However, not all gentrification efforts are driven purely by economic incentives; they may also be influenced by changing lifestyles, demographic shifts, and even cultural representation in media.
What is the velocity of a wave traveling north with a frequency of 75 hertz and a wavelength of
6 meters?
Answer:
v = 450 m/s
Explanation:
Given data:
Frequency = 75 Hz
Wavelength = 6 m
Velocity = ?
Solution:
Velocity is the product of frequency and wavelength.
v = f × λ
v = 75 Hz × 6 m
Hz = s⁻¹
v = 75 s⁻¹ × 6 m
v = 450 m/s
Answer: 450
meters per second
Explanation:
The Lewis structure for CIF^2+ is shown. What is the electron-pair geometry and the molecular geometry around the central atom
1:electron pair geometry->trigonal pyramid
2: molecular pair geometry->linear
According to molecular geometry, the electron pair geometry is trigonal pyramid and molecular pair geometry is linear.
Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.
It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.
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6.
A gas occupies a volume of 224 cm and a pressure of 1.51 bars. If the gas expands to a volume of 578 cm,
what will the new pressure be? (Assume the temperature remains constant.)
Answer:
The new pressure is 0.5852 bar
Explanation:
Since the temperature is constant, we can apply Boyle's Law.
Boyle's Law states that at constant temperature, pV = constant
[tex]p_{1}V_{1}=p_{2}V_{2}\\p_{1}=1.51\:bar\\V_{1}=224cm^{2}\\V_{2}=578cm^{2}\\Let\:p_{2}\:be\:the\:new\:pressure.\\p_{2}=\frac{p_{1}V_{1}}{V_{2}}=\frac{1.51\times224}{578}\\ p_{2}=0.5852\:bar[/tex]
Therefore, the new pressure is 0.5852 bar
Since the new oceanic crust is created at the mid-ocean ridges, then the Earth is getting bigger.
True
False
Answer:
False
Explanation:
It is true that new crust is being created at the mid-oceanic ridges, but this does not make the Earth any bigger despite the the growth of oceanic crusts in these regions.
The reason that Earth does not get bigger is because the same plates that are being created at the divergent plate boundaries are recycled into the mantle at the subduction zones. Because of this, the surface area of the Earth remains the same.
Sand is made up of silicon dioxide, SiO2 (molar mass=60.). How many silicon atoms are in a
smgle grain of sand weighing 55.2 micrograms?
Answer:
5.54 × 10¹⁷ atoms
Explanation:
Given data:
Mass of sand = 55.2 μg (55.2 ×10⁻⁶ g)
Molar mass of sand = 60 g/mol
Number of atoms = ?
Solution:
Number of moles = mass/ molar mass
Number of moles = 55.2 ×10⁻⁶ g / 60 g/mol
Number of moles = 0.92 × 10⁻⁶ mol
Number of atoms:
one mole = 6.022 × 10²³ atoms
0.92 × 10⁻⁶ mol × 6.022 × 10²³ atoms / 1mol
5.54 × 10¹⁷ atoms