Question 1

The composition of a carbon dioxide (CO2) molecule is one atom of C-12 and two atoms of O-16. 

What is the number of molecules of CO2 in 2.2 kg of the gas? 612C6{12}\mathrm{C}

  A  

1.0 × 1022

  B  

3.0 × 1022

  C  

3.0 x1025

  D  

4.7 × 1025

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Question 2

What is the total internal energy of 2.4 mol of an ideal gas which has a temperature of 15 °C? 

  A  

6.0 × 10−21 J

  B  

1.4 × 10−20 J

  C  

4.5 × 102 J


  D  

8.6 × 103 J


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Question 3

A fixed mass of gas occupies a volume V. The temperature of the gas increases so that the root mean square velocity of the gas molecules is doubled. What will the new volume be if the pressure remains constant? 

2v​
√2v​
2 V
4 V

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Question 4

X and Y are two gas bottles that are connected by a tube that has negligible volume compared with the volume of each bottle.

Initially the valve W is closed.

X has a volume 2V and contains hydrogen at a pressure of p.

Y has a volume V and contains hydrogen at a pressure of 2p.

X and Y are both initially at the same temperature.

W is now opened. Assuming that there is no change in temperature, what is the new gas pressure?

32​ p
35​ p
34​ p
23​ p

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Question 5

A gas occupies a volume V. Its particles have a root mean square speed (crms) of u.

The gas is compressed at constant temperature to a volume 0.5V.

What is the root mean square speed of the gas particles after compression?

2u​
u
2 u
4 u

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Question 6

A fixed mass of gas is heated at constant volume. The graph is drawn for this process.

What do x and y represent?

  A  
  B  
  C  
  D  

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Question 7

Three particles are travelling in the same plane with velocities as shown in the vector diagram.

What is the root mean square speed of the particles?

  A  

4.3 m s−1

  B  

7.5 m s−1

  C  

19 m s−1

  D  

56 m s−1

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Question 8

Brownian motion

  A  

makes it possible to see the motion of air molecules


  B  

is caused by the collisions of smoke particles

  C  

is caused by collisions between air molecules and smoke particles


  D  

occurs because air is a mixture of gases and the molecules have different masses

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Question 9

Which is not an assumption about gas particles in the kinetic theory model for a gas?


  A  

they collide elastically with the container walls

  B  

they have negligible size compared to the distance between the container walls


  C  

they travel between the container walls in negligibly short times


  D  

they collide with the container walls in negligibly short times

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Question 10

The graph shows the variation of pressure p with temperature for a fixed mass of an ideal gas at constant volume.

What is the gradient of the graph?

  A  

0.341

  B  

0.395

  C  

2.93

  D  

5.00

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Question 11

Two flasks X and Y are filled with an ideal gas and are connected by a tube of negligible volume compared to that of the flasks. The volume of X is twice the volume of Y.

X is held at a temperature of 150 K and Y is held at a temperature of 300 K.

What is the ratio mass of gas in Xmass of gas in Y\frac{mass\ of\ gas\ in\ X}{mass\ of\ gas\ in\ Y}?

  A  

0.125

  B  

0.25

  C  

4

  D  

8

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