Particles of Matter

Usually, atoms move slower in solids than they do in liquids. Which evidence supports this statement?

• Diffusion is the moving of particles from higher to a lower concentration.
• The atoms in gas move the fastest.
• Solids, liquids, and gases can all undergo the process of diffusion.
• Solid atoms are more tightly packed than in liquids & less space to move.

"If you put a million atoms next to each other, they will be as thick as 1 piece of human hair.”What does this show?

• how atoms can be seen with a regular microscope
• how tiny atoms actually are
• how much they look like hair
• how hairy atoms actually are

What is kinetic energy?

• the stored energy an object has because of its position or state.
• the energy that holds the atoms in a molecule together.
• the energy in the center (or nucleus) of an atom.
• the energy of a moving object.

What is thermal energy?

• the stored energy an object has because of its position or state.
• the total amount of moving energy in a substance noted by moving particles.
• the energy in the center (or nucleus) of an atom.
• the energy of a moving object.

What is temperature?

• the energy in the center (or nucleus) of an atom.
• the energy transferred from stuff at a higher temp. to a lower temp.
• a measure of the average kinetic energy of atoms in a substance.
• the energy of a moving object.

What is heat?

• the energy in the center (or nucleus) of an atom.
• the energy transferred from stuff at a higher temp. to a lower temp.
• a measure of the average kinetic energy of atoms in a substance.
• the energy of a moving object.

What happens when energy is transferred (moved) between two objects?

• Changes in size, shape, volume, and mass of both objects.
• A change in temperature - always cold to warm.
• A change in the state of matter - if it's a solid changing to liquid.
• A change in temperature and/or a change in state of matter.

What happens to the atoms when a substance changes state?

• Atoms change their motion (not moving/moving some/moving a lot).
• Atoms change their position (close together/further apart).
• Atoms change NEITHER their motion NOR their position.
• Atoms change BOTH their motion AND their position.

What is the name for change of state from a solid to a gas?

• sublimation
• deposition
• melting
• evaporation/vaporization

Does the change from a solid to a gas add heat or remove heat?

• add heat
• remove heat