Review 3

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

• Water evaporating from a pot on a hot stove
• Sand being removed from sea water by filtration
• A spoonful of sugar dissolving in a glass of water
• A white solid forming when two clear liquids are poured together
  

Which of the following always results from a chemical reaction?

• Fire
• Bubbles
• A new substance that is a solid
• A new substance that can be a solid, liquid, or gas
  

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

• The surface of a copper penny changing color after being in a drawer for years
• Melted butter becoming a solid when placed in the refrigerator
• A car rusting when exposed to the air and rain
• Bread toasting
  

What happens when chemical bonds break and new bonds form?

• a physical change
• a chemical reaction
• matter is destroyed
• surface area increases
  

The substances listed on the left side of a chemical equation are the

• Products
• Coefficients
• Precipitates
• Reactants

How many Lithium atoms are on the Reactant side of this equation?

6Li + 2H₃PO₄ ---> 3H₂ + 2Li₃PO₄

• 6

• 1

• 17

• 24

Which of the following is NOT a physical property?

• flexibility
• flamability
• melting point
• ability to conduct electricity

A solid that forms from solution during a chemical reaction is a(n)

• precipitate
• reactant
• product
• byproduct

If reactants' mass is 18g , what is the mass of the reactants ?

• 15

• 36

• 81

• 18

If there are 4 H atoms on the reactant side, how many H atoms will be on the product side? 

• 2
• 4
• 6
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