Tag: particle theory of matter

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Questions Related to particle theory of matter

Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

  1. increasing pressure on hydrogen contained in a closed container

  2. some hydrogen gas leaking out of the container

  3. increasing the volume of the container of hydrogen gas

  4. adding more hydrogen gas to the container without increasing the volume of the container
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

When hydrogen gas leaks out of the container, the molecules of the gas remaining in the container have more free space. Hence, distance between the gas molecules increases. By increasing the volume of the container also increases the distance between the molecules.

Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

Which of the following generalizations cannot be made about the phase change of a pure substance from solid to liquid?

  1. It involves a change in potential energy.

  2. It involves no change in temperature.

  3. It involves a change in kinetic energy.

  4. It involves a change in entropy.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When a pure substance undergoes a phase change from solid to liquid state,there will increases in temperature so,the collision rate do not increases which implies that there is no change in kinetic energy,the entire heat involves a change in potential energy.It involves change in entropy because more free particles are generated from solid to liquid.

Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

Statement I: Water droplets form on the outside of a beaker containing an ice bath.
Statement II: Water vapor molecules in the air lose energy when they collide with the cold glass surface and condense.

  1. Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.

  2. Both Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I.

  3. Statement I is correct, but Statement II is incorrect.

  4. Statement I is incorrect, but Statement II is correct.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Condensation is a process in which gaseous molecules lose energy and gets converted to liquid state.

Water droplets are formed on outside of a beaker containing ice bath because water molecules in air loose energy when they collide with the cold glass surface  and condense.

Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

An electron having mass '$m$' and kinetic energy $E$ enter in the uniform magnetic field $B$ perpendicularly, then its frequency will be:

  1. $\displaystyle \dfrac{eE}{qVB}$
  2. $\displaystyle \dfrac{2\pi m}{eB}$
  3. $\displaystyle \dfrac{eB}{2\pi m}$
  4. $\displaystyle \dfrac{2m}{eBE}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It velocity of particle is perpendicular to the magnetic field,the particles moves in a circle.The centripetal force is experienced by electron is $qVB$

$\cfrac { { m }v^{ 2 } }{ r } =qVB\ \cfrac { mv }{ r } =qB\ $
$mw=qB$
$w=qB/m$
$f=\cfrac { qB }{ 2\pi m } $
Frequency$=\cfrac { eB }{ 2\pi m } $

Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 kV, its kinetic energy will be :

  1. 1840 keV

  2. 1/1840 keV

  3. 1 keV

  4. 920 keV
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
We know that :

Kinetic energy = Relative charge$\times$ accelerating potential

$KE=1e\times 1kV$

$KE=1keV$

Hence the correct option is C.
Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

As the water heats up from 280 K to 310 K, the average kinetic energy of its molecules will:

  1. increase

  2. decrease

  3. stay the same

  4. increase, then decrease

  5. decrease, then increase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$T$ $\alpha$  $KE$
Higher the temperature higher will be kinetic energy .
Hence, as the water heats up from 280 K to 310 K, the average kinetic energy of the its molecules will increase.

Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

Which of the following is a physical change?

  1. Burning fuel in your car

  2. Baking cookies

  3. Mixing vinegar and baking soda

  4. Respiration (inhaling oxygen gas and exhaling carbon dioxide gas)

  5. Evaporating water
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Evaporation is a physical change because when water evaporates no new substances are being made or nothing is being taken away from it, so in that case its still water. All the other options involve making new substances, so they all are chemical changes. 

Hence, $E$ is correct.