MS.7 Checkpoint

A paper being waded up.

• Chemical Change
• Physical Change

A piece of paper being burned.

• Chemical Change
• Physical Change

In a solid, the particles

• vibrate in place
• slide past one another
• overcome the strong attraction
• move freely in any direction

At higher temperatures

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

What does the law of conservation of matter and energy say?

• that matter changes phase when it absorbs thermal or heat energy

• that all matter melts when heated

• that matter and energy cannot be created or destroyed, but just transformed from one form into another

• that energy causes motion in matter

Which state of matter has the highest kinetic energy (atoms move the fastest)?

• solid
• liquid 
• gas

Which state of matter has the lowest kinetic energy (atoms move the slowest)?

• solid 
• liquid
• gas

During a reaction, atoms are

• created

• destroyed

• neither created or destroyed - just rearranged

How many total atoms are in this compound? Al₂O₃

• 2

• 5

• 6

• 3

The reactants in the image above are:

• CH4 and 2 O2

• 2 H2O and CO2

• All of these are reactants

• All of these are products