States of Matter
86 questions· page 1 of 9
Four gases are listed.
What is the order of their rate of diffusion at room temperature and pressure?
Options
| slowest fastest | ||||
|---|---|---|---|---|
| A | 1 | 2 | 4 | 3 |
| B | 2 | 1 | 3 | 4 |
| C | 3 | 4 | 2 | 1 |
| D | 4 | 1 | 3 | 2 |
At temperature X, the volume of samples of hexane and pentane are not affected by changing the pressure from 1 atm to 2 atm.
At temperature X, the pentane molecules are free to move.
At temperature X, the hexane molecules are in fixed positions.
What are the states of hexane and pentane at temperature X?
Options
| hexane | pentane | |
|---|---|---|
| A | liquid | solid |
| B | liquid | gas |
| C | solid | liquid |
| D | solid | gas |
A gas is produced by a chemical reaction at one side of a laboratory.
After a few minutes, the gas is detected at the other side of the laboratory.
Which process explains why the gas is detected at the other side of the laboratory?
Options
A condensation
B diffusion
C dissolving
D evaporation
The pressure of a sample of air is reduced and its temperature remains constant.
Which row describes the changes in the volume of the air and the distance between the particles in the air?
Options
| volume of air | distance between the particles in the air | |
|---|---|---|
| A | decreases | decreases |
| B | decreases | increases |
| C | increases | decreases |
| D | increases | increases |
Which substance would diffuse most quickly?
Options
A carbon dioxide at
B carbon dioxide at
C neon at
D neon at
Separate samples of water and air each have a volume of at room temperature and pressure.
The pressure applied to both samples is increased by the same amount at room temperature.
Which row describes the volumes at the increased pressure?
Options
| volume of water / | volume of air / | |
|---|---|---|
| A | 20 | 3 |
| B | 20 | 300 |
| C | 30 | 3 |
| D | 30 | 300 |
Why does a balloon full of helium gas become smaller as the temperature changes from to ?
Options
A The gas condenses to a liquid and so takes up less space.
B The gas particles become smaller at lower temperatures.
C The gas particles diffuse through the balloon and escape.
D The gas particles move more slowly so reducing the pressure.
A scientist heats a sample of a liquid. The scientist measures the temperature of the sample and plots a graph of the temperature against time.
Which statements are correct?
- Between points W and X, the temperature increases and the particles move faster.
- Between points X and Y, there is no change in the temperature because energy is needed to change a liquid into a gas.
- Between points Y and Z, the particles move further apart.
Options
A 1, 2 and 3
B 1 and 2 only
C 1 and 3 only
D 2 only
Silicon(IV) chloride, SiCl₄, boils at .
Which row shows the type of change when silicon(IV) chloride boils and the explanation?
Options
| type of change | explanation | |
|---|---|---|
| A | chemical | intermolecular forces break |
| B | chemical | Si–Cl covalent bonds break |
| C | physical | intermolecular forces break |
| D | physical | Si–Cl covalent bonds break |
Which physical changes are both exothermic?
Options
A condensation and evaporation
B evaporation and melting
C freezing and condensation
D melting and freezing