Chemistry MCQ Paradise Kinetic Particle Theory Level 4

The particles in substance Z are widely spaced and able to move freely.

Z changes to a state in which the particles are in contact but still able to move freely.

What is this change called?

Bromine is a liquid at 20°C.

What is the melting point and the boiling point for bromine?

Two gases, P and Q, were separately released in a laboratory on a cold day. The experiment was repeated on a hot day. The time taken for the gases to reach the opposite end of the laboratory was recorded for each experiment.

The relative molecular mass of gas P was 34 and the relative molecular mass of gas Q was 64.

Which gas on which day would reach the end of the laboratory in the shortest time?

Which row correctly shows the order of the rates of diffusion of the gases ammonia, carbon dioxide and hydrogen bromide?

The stopper was removed from a bottle containing perfume X and the time taken for the smell to reach the opposite side of the room was noted.

The experiment was repeated using perfume Y. Perfume Y has a higher relative molecular mass than perfume X.

Which row gives

• the name of the process by which the perfume spreads around the room,
• the identity of the perfume that reaches the opposite side of the room in the shorter time?

Under the same conditions, which gas diffuses at the same rate as nitrogen gas?