What happens to water molecules when a large quantity of thermal energy is added to water in a liquid state?

• The more energy added, the greater the attraction between the molecules.
• The molecules gain energy, move farther apart, and become a gas.
• The water molecules become packed closer together, and their temperature increases.
• Each water molecule gives up energy and eventually stop moving.

Students were asked to draw a concept map of changes in matter at the molecular level. Based on the diagram, which of the following statements is true?

• Arrow A= particles become more tightly packed.
• Arrow B= the pressure of the substance decreases.
• Arrow C= energy of particles increases.
• Arrow D= particles become more widely spaced.

What is true of the particles of a substance that is heated or cooled?

• The particles size changes
• The particles motion changes
• The particles size and motion changes
• Neither the size nor the motion of the particles change

How do liquid water, ice, and water vapor differ from each other?

• They are made of different kinds of atoms.
• They are made of different kinds of molecules.
• They are different compounds.
• They are different states of matter.

At higher temperatures

• a gas contracts
• particles in an object move faster
• particles in an object have less energy
• particles in an object move slower

Which state of matter has particles that are tightly packed and vibrate in place?

• Gas
• Plasma
• Liquid
• Solid

What happens to the energy of particles during freezing?

• Energy increases
• Energy stays the same
• Energy decreases
• Energy Multiples

What is the primary characteristic of liquids?

• Fixed shape and volume
• No fixed shape but fixed volume
• Particles don't move
• Particles are far apart

What determines the temperature of matter?

• Volume of the container
• Mass of the substance
• Speed of the particles
• Color of the substance

Which statement about solids is correct?

• Particles move freely
• Has no fixed shape
• Has a definite shape
• Particles are far apart