FUELS: Mid-unit Review

Read the following chemical formula: C₆H₁₂O₆. How many hydrogen atoms are in the formula?

• 12
• 6
• 4

The law of conservation of mass states that....

• Matter can be made
• Matter can be destroyed
• Matter can neither be made or destroyed

What is the part of the chemical equation in green called? 
Fe + S --> FeS

• products
• reactants
• yield
• chemical formula

Is this balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!
• NO!

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

• 1
• 2
• 3
• 4

In an endothermic reaction, heat is ...

• taken in or absorbed
• given out or released 

When you freeze water, it turns to ice.  What kind of change is this?

•  Physical
• Chemical

When iron nails get rusty, heat is released.  What process is this?

• Exothermic
• Endothermic

Which of the following is NOT an example of a physical change?

• crumpled paper
• pencil sharpening
• shrunken clothing
• sour milk

A substance has a melting point of 100 °C and a boiling point of 500 °C. When is it a solid?

• 100 °C and below

• 100-500 °C

• 500 °C and above