2.3 Mastery Check

Can matter disappear?

• Yes
• No

What happens when something burns?

• atoms are destroyed and released as smoke
• atoms rearrange to form water vapor and carbon dioxide

What is energy?

• The ability for matter to change
• The electricity that powers everything

What is chemical energy?

• Energy that is stored in the bonds of molecules
• Energy from living things

Where does the energy from a flame come from ?

• ONLY the air
• the high energy bonds in molecules

All molecules have high energy bonds

• true
• false

When we burn something, we see the energy released as

• heat
• light
• motion
• all the above

List an example of a type of energy we talked about in class

What is the law of conservation of mass?

• Mass can be created or destroyed

• Mass is neither created nor destroyed in a chemical reaction

Which of the following is an example of a chemical change?

• Melting ice

• Burning wood