Phase changes

Why do different materials have different melting and boiling points?

• Because they are made of different types of particles with varying attractive forces.

• Because all materials have the same attractive forces.

• Because kinetic energy is the same for all materials.

• Because temperature affects the force of attraction between particles.

What happens to the kinetic energy of particles as the temperature increases?

• It increases.

• It remains the same.

• It depends on the type of particle.

• It decreases.

What is the state of matter when the kinetic energy is too low to overcome the force of attraction?

• Solid

• Liquid

• Gas

• Plasma

Why does gold have a much higher melting point compared to water?

• Because gold has weaker attractive forces than water.

• Because gold has stronger attractive forces than water.

• Because gold particles have lower kinetic energy.

• Because gold is a gas at room temperature.

Why is nitrogen a gas at room temperature?

• Because its attractive forces are very weak.

• Because its melting and boiling points are very high.

• Because its kinetic energy decreases at room temperature.

• Because it has very strong attractive forces.