Chemical Formulas, Reactions, and Equations

What is the right part of a chemical equation called?
H_{2 +} O → H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Which is NOT an indication of a chemical change?

• temperature change
• formation of a precipitate
• shape change
• production of light

The Law of Conservation of Mass proves that -

• the number of atoms in a chemical reaction does not change
• there are more atoms on the reactant side than the product side
• there are more atoms on the product side than the reactant side
• the mass of the product will not equal the reactants

You know you a chemical reaction has occurred if 

• there is a precipitate.
• there is a color change.
• there is a temperature change.
• All of these answers are evidence.

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2
• 6
• 1
• 4

The red numbers in the image below represent ________

• subscripts
• coefficients
• the number of atoms
• None of the answers are correct

The blue numbers in the image below represent ________

• the number of compounds
• coefficients
• subscripts
• none of the answers are correct

The substances at the beginning of a chemical equation are called the ____

• product
• yield
• chemical symbol
• reactants

Which is the correct atom count for the reactant side of the chemical equation?
CH₄ + 2 O₂ -> CO₂ + 2 H2O

• C=4
  H=4
  O=4
• C=1
  H=4
  O=2
• C=1
  H=4
  O=2
• C=1
  H=4
  O=4

How many O's are in Al₂(SO₄)₃

• 4
• 12
• 7
• 24