Chemistry

Question 1

1According to the kinetic theory, raising the temperature of a gas

Easy

A. stops the particles B. increases the speed of its particles C. reduces pressure in a closed container D. makes particles bigger

Question 2

2Gases are easily compressed because their particles are

Easy

A. far apart B. close together C. very heavy D. not moving

Question 3

3Sweating cools the body because

Easy

A. sweat is cold B. evaporation takes heat energy from the skin C. sweat blocks sunlight D. water conducts heat into the body

Question 4

4Iodine crystals change straight from solid to vapour on heating. This is

Easy

A. condensation B. melting C. evaporation D. sublimation

Question 5

5According to Graham's law, the rate of diffusion of a gas is

Hard

A. proportional to pressure only B. inversely proportional to the square root of its molar mass C. independent of mass D. directly proportional to its mass

Question 6

6A gas occupies 2 dm³ at 300 K. At constant pressure, what is its volume at 600 K?

Easy

A. 2 dm³ B. 1 dm³ C. 6 dm³ D. 4 dm³

Question 7

7How many times faster does hydrogen (Mr = 2) diffuse than oxygen (Mr = 32)?

Medium

A. 2 times B. 4 times C. 8 times D. 16 times

Question 8

8Real gases deviate most from ideal behaviour at

Hard

A. room conditions B. high pressure and low temperature C. all conditions equally D. low pressure and high temperature

Question 9

9The direct change from solid to gas is

Easy

A. freezing B. condensation C. sublimation D. evaporation

Question 10

10Brownian motion is evidence that

Easy

A. gases have no mass B. particles of matter are in constant random motion C. atoms are charged D. liquids are rigid