Answer:
The given graph in the question shows relation between melting point and boiling point of the given substance.
Explanation:
The above given graph shows Direct proportionality between melting point and boiling point that is with the decreasing of melting point, the boiling point is also decreasing. Hence the proportionality is shown between the two temperatures of boiling and melting in the given graph.
Use the periodic table to identify the noble gas that would be included in the noble-gas notation for each of the following elements.
Si:
Fr:
Hg:
V:
Answer:
Si ⇔ Neon
Fr ⇔ Radon
Hg ⇔Xenon
V ⇔Argon
Explanation:
Silicon (Si) is, part of the carbon-group, and has atomic number 14. This means it has 14 protons and 14 elecrons ( same amount), as well as 14 protons ( 28-14).
⇒There are 14 electrons spread over 3 shells.
If we look closer to the electron configuration of a silicon atom:
₁₄Si 1s² 2s² 2p⁶ 3s² 3p² ⇔ this is [Ne] 3s² 3p²
⇒ Neon (Ne) is noble gas ( group 18) with atomic number 10.
⇒The following orbital is 3s, which is complete with 2 electrons.
⇒The next orbital is 3p, and Silicon is the second element in that section, so two electrons are used.
Francium (Fr) is part of the alkali / lithium group and has atomic number 87. This means it has 87 protons and 87 electrons ( same amount), and 136 neutrons (223 - 87).
⇒There are 87 electrons spread over 7 shells.
If we look closer to the electron configuration of a francium atom:
₈₇Fr 1s²2s²2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 7s¹ ⇔ this is [Rn] 7s¹
⇒ radon (Rn) is noble gas( group 18) with atomic number 86
⇒we will see that the 4 s orbital fills with electrons before any of those in the 3 d subshell as the 4 s orbital is lower in energy than the 3 d s, and it is favorable for electrons to fill low-energy orbitals first (closer to the nucleus)
⇒Francium will fill orbitals all the way up to the 7 s subshell, where it will have a half-filled orbital: 7 s 1
Mercury (Hg) is part of the zinc group, and has atomic number 80. This means it has 80 protons and 80 electrons ( same amount), and 121 neutrons ( 201 - 80).
⇒There are 80 electrons spread over 6 shells
If we look closer to the electron configuration of a Mercury atom:
₈₀Hg 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² ⇔ this is[Xe] 4f¹⁴ 5d¹⁰ 6s²
⇒xenon (Xe) is noble gas ( group 18) with atomic number 54.
⇒After the 6s orbital is filled, 4f fills next (can hold 14 electrons) because it lower in energy than 5d.
⇒Then, the 10 remaining electrons will go in the 5d orbital. The f orbitals will always be one principle quantum number(n) behind the d orbitals.
Vanadium (V) is part of the vanadium group, and has atomic number 23. This means it has 23 protons and 23 electrons (same amount), and 28 neutrons (51 - 23).
⇒There are 23 electrons spread over 4 shells
If we look closer to the electron configuration of a vanadium atom:
₂₃V 1s² 2s² 2p⁶ 3s² 3p⁶ 3d³ 4s² ⇔ this is [Ar] 3d³ 4s²
⇒argon (Ar) is a noble gas (group 18) with atomic number 54.
⇒ When the atom of V releases 5 electrons from 3d and 4s orbital, V ion (V5+) will attain the octet structure, 1s2 2s2 2p6 3s2 3p6 which is same as Argon
Answer:
Neon (Ne) for Silicon (Si)
Radon (Rn) for Francium (Fr)
Xenon (Xe) for Mercury (Hg)
Argon (Ar) for Vanadium (V)
Explanation:
Did it on edge
Which of the graphs below illustrates water boiling in Denver, Colorado? (Altitude 1,600 meters.)
Answer:
The graphs that come with this question are in the picture attached.The answer is graph identified with the letter A.Explanation:
The normal boiling point of water is 100°C. That is the temperature at which water boils when the atmospheric pressure is 1 atm, i.e. at sea level.
The liquids boil when its vapor pressure equals the atmospheric pressure; so the higher the atmospheric pressure the higher the boiling point, and the lower the atmospheric pressure the lower the boiling point.
Since, it is stated that the altitude of Denver, Colorado is 1,600 m, the atmosperic pressure (ther pressure exerted by the columnn of air above the place) is lower than 1 atm (atmospheric pressure at sea level).
Hence, water boiling point in Denver is lower than 100°C.
The graphs shown represent the temperature (T °C) as water is heated. Since when liquids boil their temperature remains constant during all the phase change, the flat portion of the graph represents the time during which the substance is boiling.
In the graph A, the flat portion is below 100°C; in the graph B, the flat portion is at 100 °C; in the graph C the flat part is above 100ªC, and, in graph D, there is not flat part. Then, the only graph that can illustrate water boiling in Denver, Colorado is the graph A.
What do parent and daughter cells have in
common? Check all that apply.
Answer:
Mitosis is common to all eukaryotes; during this process, a parent cell splits into two genetically identical daughter cells, each of which contains the same number of chromosomes as the parent cell.During meiosis, the cells needed for sexual reproduction divide to produce new cells called gametes.
Answer:
They contain copies of the same cellular components.
They are exact copies of one another.
Explanation:
i just got the answers
What objects in your home has chemical and physical properties
Answer:
Chemical properties would be like what you would make food with because you are changing the structure of the ingredients.
Physical properties would be like a chair or the device you asked this question on.
Explanation:
Objects in your home, such as an iron skillet or a plastic water bottle, have both chemical and physical properties. The skillet can rust, which is a chemical property, and is also hard, a physical property. The water bottle is made of polymers (a chemical property) and is also transparent and flexible (physical properties).
Explanation:Many objects in your home have both chemical and physical properties. For example, an iron skillet has the chemical property of being able to rust when exposed to water and air, a physical property of this skillet is its hardness or rigidity. Similarly, a plastic water bottle has the chemical property of being made up of polymers, which are long chains of repeating molecules, and a physical property would be its transparency or flexibility.
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Which is the frequency of the wave shown?
Answer:
The frequency of wave is 0.125 Hz.
Explanation:
Frequency:
"It is an event repeat itself in a given period of time"
The unit of frequency is the Hz . If time is measured in seconds then frequency will be in Hz. Hz is equal to the per second.
Formula:
f = 1/ T
f = 1/ 8 sec
f = 0.125 Hz
Which statements describe lattice energy?
Answer:
Which statements describe lattice energy?
B,C,D
Explanation:
just did it
Compare mechanical energy and thermal
energy.
Answer:
Explanation:
Mechanical and thermal energy are both different forms of energy. They can be converted from one to another. Some systems relies solely on this form of energy conversion between these types of interactions.
Mechanical energy is a form of energy that is due to the motion of a body.
Thermal energy is due to the temperature changes between bodies.
Both forms of energy are not related but they can be converted from one from to anther.
A scientist develops a new idea based on her observations of nature. What should she do next?
A
think of a way to test the idea
B
claim that she has discovered a new theory
C
look only for evidence that supports the idea
D
reject any evidence that conflicts with the idea
Answer: Would Be A
Explanation:
You would do that because in the scientific method it said make a question, hypothesize and test the idea and make conclusions.
Answer:
the answer is A).
Explanation:
1.
Earth's diameter is 12.756 kilometers. How many meters is this?
2.
The diameter of Earth's moon is 3.476 kilometers. Express this distance in centimeters.
If an isotope of an element has 40 neutrons and a mass number of 79, how many electrons must it have?
Answer: 39 electrons
Explanation: Subtract 79 by 40 to get the atomic number (amount of protons) which is 39. The number of electrons must be the same as the number of protons if it's not an ionic compound so the amount of electrons is the same amount of protons.
To find the number of electrons in an atom, identify the atomic number which is equal to the number of protons. Since the mass number is 79 and the isotope has 40 neutrons, the number of protons is 39, meaning an atom of this isotope also has 39 electrons.
Explanation:In order to find the number of electrons in an isotope of an element, we need to identify the atomic number of the isotope. The atomic number is equal to the number of protons in the nucleus of the atom, which is also equal to the number of electrons in a neutrally charged atom.
The mass number of an isotope is the total number of protons and neutrons in the nucleus. Given that the mass number is 79 and the isotope has 40 neutrons, we can subtract the number of neutrons from the mass number to find the number of protons: 79 - 40 = 39.
Therefore, we can conclude that the volumetric element has 39 electrons. This is because in a neutrally charged atom, the number of electrons equals the number of protons.
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• How does convection drive plate movement?
Answer:Convection currents drive the movement of Earth's rigid tectonic plates in the planet's fluid molten mantle. In places where convection currents rise up towards the crust's surface, tectonic plates move away from each other in a process known as seafloor spreading (Fig. 7.21).
Explanation:
Convection drives plate movement because of high convection current on the Earth’s core. It makes molten rocks to move in molten layer.
Explanation:
In the aesthenosphere, high convection currents pass heat on the surface, where less dense magma leaves break down plates in distribution centres and create different plate boundaries.
When the plate moves away from the propagation centres, they also cool down to higher-density rocks, which are part of the oceanic crust consumed in ocean subduction areas. Then, the crust returns to aesthenosphere.
Generally, the heat generated by the radioactive decomposition of elements deeper in the Earth produces magma (molten rock) in aesthenosphere. It (70 to 250 km) is a part of mantle, the central globe, extending over 2,900 km.
A substance contains an arrangement of different types of atoms joined together by chemical bonds. Which of the following classes of substances could this describe?
A) all matter
B) all elements
C) all compounds
D) all pure substances
Answer:
The correct classification of the statement is all compounds.
Explanation:
All matter is defined as something that entirely has weight and occupies some sought of space. That's why it can't be used to describe the above statement.All elements are defined as substances that have an equal number of protons. The atoms in an element contain an exact atomic number.All compounds can be defined as a formation that takes place when a variety of atoms are chemically combined. Hence, this explains the answer above.All pure substances mean that the substance is not mixed with anything at all. It's just by itself.9474 millimeters to centimeters using scientific notation showing work
Answer:
9.474 x 10^2
Explanation:
ok. first you have to get the value in the required unit so 9474mm/(10mm/cm) = 947.4 so scientific notation states that the number must be raised to any power of an integer and the value of the number being raised must be less than than 10 and more than or equal to 1
so it must have one digit in front so.. 947.4 becomes 9.474 and because you move 2 places to the left, ur power is positive 2
and proof 10^2 is 100 so multiply 9.474 by 100 and u will get 947.4 cm which is also 9474 mm
Which option correctly explains electrical conductivity of metals?
Metals are poor conductors of electricity because the inner electrons in metallic crystals are not free to move.
Metals are poor conductors of electricity because the valence electrons in metallic crystals are not free to move.
Metals are good conductors of electricity because the valence electrons in metallic crystals are free to move.
Metals are good conductors of electricity because the inner electrons in metallic crystals are free to move.
Answer:
Metals are good conductors of electricity because the valence electrons in metallic crystals are free to move.
Explanation:
Metallic bonds joins atoms of metals and alloys together. The formation of this bond type is favoured by large atomic radius, low ionization energy and a large number of electrons in the valence shell.
The metallic bond is responsible for the bulk of the physical properties of metals we know such as malleablility, ductility, electrical and thermal conductivity e.t.c.
According to the following reaction, what volume of 0.244 M KCl solution is required to react exactly with 50.0 mL of 0.210 M Pb(NO3)2 solution? 2 KCl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2 KNO3(aq)
Answer:
86 mL
Explanation:
First find the moles of Pb (NO3)2
n=cv
where
c ( concentration)= 0.210 M
v ( volume in L) =0.05
n= 0.210 × 0.05
n= 0.0105
Using the mole ratio, we can find the moles of KCl by multiplying by 2
n (KCl) =0.0105 ×2
=0.021
v (KCl)= n/ c
= 0.021/ 0.244
=0.08606557377
=0.086 L
= 86 mL
Answer:
The volume of 0.244 M KCl solution is required 86.07 mL.
Explanation:
[tex]Concentration=\frac{Moles}{Volume (L)}[/tex]
Moles of lead nitrate in 50.0 mL of 0.210 M solution be n.
Molarity of the lead nitrate solution = 0.210 M
Volume of the solution = 50.0 mL = 0.050 L ( 1 mL = 0.001 L)
[tex]0.210 M=\frac{n}{0.050 L}[/tex]
[tex]n=0.210 M\times 0.050 L=0.0105 mol[/tex]
According to reaction given, 1 mole of lead nitrate reacts with 2 moles of KCl.
Then 0.0105 moles of lead nitrate will react with:
[tex]\frac{2}{1}\times 0.0105 mol=0.021 mol[/tex] of KCl
Moles of KCl = 0.021 mol
Volume of KCl solution = V
Molarity of the KCl solution = 0.244 M
[tex]0.244 M=\frac{0.021 mol}{V}[/tex]
[tex]V=\frac{0.021 mol}{0.244 M}=0.08607 L = 86.07 mL[/tex]
The volume of 0.244 M KCl solution is required 86.07 mL.
HELP ASAP PLZ!!! WILL GIVE BRAINLIEST
Carl creates the model of a diamond shown below. His model shows atoms of carbon in a crystalline structure. What can Carl determine about diamonds using his model?
Group of answer choices
A diamond is a mixture because it is made of compounds.
A diamond is an impure substance because it made of mixtures.
A diamond is a pure substance because it is made of one element.
A diamond is a mixture because it is made of elements.
(here is the pic)
Answer:
A diamond is a pure substance because it is made of one element.
Explanation:
From the crystalline structure model of the diamond, we can see that we only have just one element represented by the green balls connected in a cross linked fashion to one another. Therefore, one can rightly conclude that this is a pure substance made up of one element.
In a pure substance, all parts are homogeneous and composition is definite.
Grade
In a chemical reaction, sulfuric acid and aluminium metal react
to form hydrogen gas and a salt solution of aluminium sulfate.
Ben has written this equation for the reaction:
Al +H,SO(g) → A1,(SO )3(aq) + H, (R
Ben's equation is not balanced. Write a balanced chemical equation for this reaction.
Answer:
2Al + 3H2SO4 (g) → Al2(SO4)3 (aq) + 3H2 (g)
Explanation:
On the right side we have Al2 ( so 2x aluminium, So on the left side we multiply Al by 2, On both sides is 2x Al now)
The formula for Sulfuric acid is H2SO4.
The result ( aluminium sulfate ) is Al2(SO4)3. Aluminium has an oxidation number of +3, SO4 has an oxidation number of -2 ( S(+6) + 4O (4x-2) : 6-8 = -2
So we have to multipy aluminium 2x and SO4 (3x) to equal.
On the right side we have 3x S, so on the right side we have to multiply H2SO4 also by 3 to get the same amount.
This results in 12x Oxygen (3xO4). Which is the same as the right side.
On the left side we have 6H ( 3xH2) so on the right side we multiply H2 by 3 to get the same amount.
So we have on both sides:
2x Al
6xH
3xS
12xO
Q6.The manufacturer supplying concentrated ethanoic acid for the production of vinegar als
supplied other acids. The label had come off a batch of one of these other acids.
A sample of this unknown acid was analysed and found to contain 54.5% of carbon and 9.10% OL
hydrogen by mass, the remainder being oxygen.
CHO
(a)
Use these data to calculate the empirical formula of the unknown acid.
Show your working.
The problem gives us the percentages for carbon and hydrogen in the unknown acid:
54.5 % carbon
9.10 % hydrogen
The difference until 100 % is oxygen:
36.4 % oxygen
Now we may calculate the empirical formula of the unknown acid:
First we divide each percentage by the atomic mass of each component:
carbon = 54.5 / 12 = 4.54
hydrogen = 9.1 / 1 = 9.1
oxygen = 36.4 / 16 = 2.28
Now we divide the answers to the smallest number, which is 2.28:
carbon = 4.54 / 2.28 = 2
hydrogen = 9.1 / 2.28 = 4
oxygen = 2.28 / 2.28 = 1
Now the empirical formula for the acid will be:
C₂H₄O₁
And molecular formula:
(C₂H₄O₁)ₓ , but here we do not have enough information to determine unknown "x".
Who discovered the electron and what instrument did he use?
Answer:J.J. Thomson, he was using a high-vacuum cathode-ray tube
Explanation:(I Googled it)
J.J. Thomson discovered the electron in 1897 using a cathode ray tube.
The discovery of the electron is attributed to the English physicist J.J. Thomson in 1897 through his groundbreaking work with the cathode ray tube. A cathode ray tube operates by passing an electric current through gases at low pressure, forming a glowing beam or cathode ray from the negatively charged cathode to the positively charged anode. Thomson's experiments demonstrated that these rays consisted of negatively charged particles, later named electrons, indicating that atoms were not indivisible as previously thought but composed of smaller subatomic particles. This realization marked a pivotal moment in the understanding of atomic structure, disproving the notion that the atom was the smallest unit of matter.
b. Write the formula for density.
Density is mass divided by volume
Happy to help! Please mark me as the brainliest!
Answer and Explanation:
[tex]\huge\boxed{Density=\frac{mass}{volume}}[/tex]
That's the formula ↑
For a 20-gram mass that takes up a volume of 5 cubic centimeters:
[tex]density[/tex] [tex]is=\frac{20}{5} gm/cm^{3}[/tex]
[tex]=4gm/cm^3[/tex]
Regina has been growing sunflowers in her backyard so she can harvest their seeds. The sunflowers are all growing in the same type of soil and receive the same amount of sunlight. Regina has also provided them all with the same amount of water. So far, the sunflowers have all grown the same amount.
Regina's grandfather comes to visit, and he tells Regina that the flowers will produce more seeds if she gives the flowers Fertilizer X. Regina would like to try the fertilizer, but it is very expensive. She decides to test the fertilizer in a scientific investigation before purchasing enough for all of the sunflowers.
Which of the following questions can Regina answer through a scientific investigation in order to test her grandfather's claim?
A.
Will Regina's grandfather be upset if she uses a cheaper fertilizer that works as well as Fertilizer X?
B.
Will providing sunflowers with Fertilizer X cause the flowers to produce more seeds?
C.
Will providing sunflowers with Fertilizer X result in more attractive flowers?
D.
Would it be wiser to use Fertilizer X on vegetable plants since it is so expensive?
Answer:
B.
Will providing sunflowers with Fertilizer X cause the flowers to produce more seeds?
Explanation:
The question B is a sort of untested idea. It is the ideal hypothesis for Regina to test and see if the brand of the fertilizer will improve her sunflower seed production.
To scientifically carryout this test, Regina must set up an experiment. The experiment will help her affirm her grandfather's observation about the fertilizer.
The dependent variable here is the yield of the sunflower as we know. The sunflower will produce more seeds based on how nourished it is with available nutrients.
In her experiment, she can use the normal soil, soil with fertilizer x and maybe organic manure mixed with soil to compare different results. She then proceeds to plant her seed and on the long run observe the output.
From the result of her experiment, she can then conclude on her hypothesis. With the experiment, she can prove wether the fertilizer will improve the yield of the seeds or not.
Answer:
The answer is B - Will providing sunflowers with Fertilizer X cause the flowers to produce more seeds?
Explanation:
I had the question a little bit of go and it was B and I got it right.
The substances in a ___________ mixture can usually be seen and are easily separated.
A. homogeneous
B. heterogeneous
C. simple
D. compound
The substances in a heterogeneous mixture can usually be seen and are easily separated, exemplified by a mixture of sand and water. Option B is correct.
The substances in a heterogeneous mixture can usually be seen and are easily separated. A heterogeneous mixture consists of two or more substances that are not uniformly distributed, meaning the different components can usually be observed with the uncovered eye.
An example of a heterogeneous mixture is a mixture of sand and water, where the sand can be easily seen and separated from the water by simple means such as filtration.
In contrast, a homogeneous mixture is uniform, meaning its composition is the same throughout, and the different components cannot be seen. Salt dissolved in water is an example of a homogeneous mixture because the salt is evenly distributed within the water and cannot be seen separately.
Hence, B. is the correct option.
"Any process used to ask and answer testable questions about observations of the natural world" defines which term?
Answer:
Scientific inquiry
Explanation:
A scientific inquiry is a systematic way of finding out about certain phenomena in our environment through the use of careful observations and experimentation. It follows a series of steps and procedures which helps a scientist to critically think and observe certain events in his environment. Through the observations, scientific conclusions are then drawn.
Which best describes the purpose of a control sample
Answer:
The purpose of a control sample is to compare its results to those with the experimental sample. Control sample is a type of renown forensic samples usually used to ensure analyses are properly performed to assure reliable results.
HOPE THIS HELPED!!!!!!!!!!!XDDDDDDDDD
The control sample in the experimental system has been used as the reference for the test.
The experimentation setup has been consisted of the test sample along with the control sample as designated conditions.
What is the use of Control sample?The control sample has been set in an experimental setup as the reference. The test sample has been consisted of the substance to be tested, and the control sample lack the substance.
The samples are treated at equivalent conditions and the results has been compared from test to control abut the difference bought by the substance.
Thus, the control sample in the experimental system has been used as the reference for the test.
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What is the difference between metals and non metals on the periodic table
Answer:
On the periodic table, metals are separated from nonmetals by a zig-zag line stepping through carbon, phosphorus, selenium, iodine, and radon. ... Elements just to the left of the line may be termed metalloids or semimetals and have properties intermediate between those of the metals and nonmetals.
Explanation:
Final answer:
Elements are categorized on the periodic table as metals, nonmetals, and metalloids, with metals being lustrous and good conductors, nonmetals being dull and poor conductors, and metalloids exhibiting intermediate properties.
Explanation:
The periodic table organizes elements into categories based on their properties. The main categories are metals, nonmetals, and metalloids (or semimetals). Metals, which occupy the left three-fourths of the periodic table, are generally shiny and silvery, excellent conductors of electricity and heat, and are malleable and ductile. On the contrary, nonmetals are typically found in the upper right-hand corner of the periodic table and tend to be dull, poor conductors of electricity and heat, and brittle in their solid form.
Metalloids, found along the zigzag line between metals and nonmetals, have properties that are intermediate between the two. For example, metalloids are semiconductors due to their unique electrical properties, which are crucial for creating transistors and other solid-state devices.
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The energy to form plasma comes from which of the following sources?
The movement of particles
Attractive forces between particles
The shape of the plasma
Heat or electricity in the atmosphere
Heat or electricity in the atmosphere
Answer:
Option (4)
Explanation:
The Plasma is formed when a gas is heated and becomes very hot. Due to this heating of gas, the atoms within the gas acquires a huge amount of energy. This energy facilitates the electrons to get eliminated from its nucleus of the gas atoms.
In simple words, plasma is defined as the ionized gas.
These plasma forms more than 99% of the universe that is visible to us. At night, these plasma appears to shine in the form of nebula, stars and auroras that is formed in the atmosphere of both the poles.
Thus, the plasma are formed due to heating or electricity in the atmosphere.
Hence, the correct answer is option (4).
What is the energy of a microwave photon of frequency 2.5x 10^9 HZ?
Answer in units of J.
Answer:
the energy of a microwave photon E = 16.565 x 10^-25 Joule
Explanation:
To get the energy of the photon we are going to use this formula : E = hf
when E is the energy of the photon which we need to calculate
h is Planck's constant = 6.626 x 10^-34 J.S
f is the photon of frequency = 2.5 X 10^9 Hz
so by substitution:
the energy of a microwave photon E = 6.626 x 10^-34 J.S * 2.5 X 10^9 S-1
= 16.565 x 10^-25 Joule
Final answer:
The energy of a microwave photon with a frequency of 2.5 x 10⁹ Hz is 1.6565 x 10⁻²⁴ Joules, calculated using Planck's equation.
Explanation:
The question asks: What is the energy of a microwave photon of frequency 2.5 x 10⁹ Hz? To find this energy, we use Planck's equation, which states that the energy (E) of a photon is equal to the product of Planck's constant (h) and the frequency (f) of the photon. Mathematically, this is expressed as E = hf. Planck's constant is 6.626 x 10⁻³⁴ J-s. Substituting the given frequency and Planck's constant into the equation gives E = (6.626 x 10-⁻³⁴J-s)(2.5 x 10⁹ Hz), which calculates to 1.6565 x 10⁻²⁴ Joules (J).
33. According to the law of conservation of mass,
when is mass conserved?
Answer:
that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Explanation:
According to the law of conservation of mass, mass can only be conserved in an isolated system.
Recall:
The law of conservation of mass states that mass can neither be created nor destroyed. However, it can be converted from one form to another.
In an open system, the mass may not be conserved because materials and energy are being exchanged between the system and the surrounding.
The mass may also not be conserved in a closed system because energy can be exchanged between the system and the surroundings even though materials cannot.
An isolated system does not exchange materials or energy with its surrounding. Thus, mass is only conserved when a system is in an isolated state.
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How long would it take for a car to travel 200km if it has an aventage speed of 55 km/ hr
Answer: 3.64 hours
Explanation:
Formula of Average speed : [tex]\text{Average speed}=\dfrac{\text{Distance}}{\text{Time}}[/tex]
Given : Distance = 200km ; Average speed = 55 km/ hr
To find : Time
Substitute values for distance and average speed in the above formula , we get
[tex]55=\dfrac{200}{\text{Time}}\\\\\Rightarrow\text{Time}=\dfrac{200}{55}=3.63636363636\approx3.64\ hr[/tex]
Hence, it would take 3.64 hours for a car to travel 200km .
Rob is conducting an experiment in which he measures a person's body temperature in response to changes in air temperature. What is the independent variable that is manipulated in the experiment?
Answer:
Explanation:
Persons body temperature
Answer: Change in air temperature is the independent variable
Explanation:
The independent variable can be defined as the factors that is under control of the experimenter.
There can be changes in the air temperature based on that the temperature of the body will change.
So, in this condition the independent variable is air temperature and dependent variable is body temperature.