States of Matter and Intermolecular Forces

Which two elements are liquids at room temperature?

• Bromine and Mercury

• Oxygen and Nitrogen

• Gold and Silver

• Helium and Neon

What happens to gallium when it is held in a warm hand?

• It turns into a gas.

• It melts into a liquid.

• It becomes harder.

• It changes color.

What are intermolecular forces?

• Forces that break apart molecules into atoms.

• Attractive forces between separate molecules.

• Forces that only exist in gases.

• Forces that make molecules repel each other.

What causes London Dispersion Forces?

• Permanent positive and negative charges in molecules.

• The strong attraction between hydrogen and oxygen.

• Temporary clustering of electrons within molecules.

• The breaking of chemical bonds between atoms.

In which state of matter are the particles stuck in one spot, mostly spinning and vibrating?

• Liquid

• Gas

• Solid

• Plasma

What happens to the particles in a solid when enough heat is added?

• They move faster and spread out to become a gas.

• They move faster and flow more freely, becoming a liquid.

• They stop moving completely.

• They become colder and stick together more tightly.

What is the attraction between molecules of a liquid to each other called?

• Adhesion

• Viscosity

• Cohesion

• Surface tension

What property describes a liquid's resistance to flow, like how slowly honey pours?

• Cohesion

• Adhesion

• Viscosity

• Capillary action