SBVC Chem 101 Ch 7 Quiz

What is the coefficient of the oxygen molecule in the elephant toothpaste equation?
2 H₂O₂ -> 2 H₂O + O₂

• 0
• 1
• 2
• 4

What do you call the substances on the left side of a chemical equation?

• yield
• products
• reactants
• compounds

Chose the correct labels for the parts of a chemical equation.

• reactants yield products
• reactants make compounds
• products equal reactants
• products yield 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

Based on the diagram, what is the formula for hydrogen peroxide?

• H₂O₁₂
• H₂O₂
• H₄O₁₀
• there is no way to determine the formula

What is true of this chemical equation?

• it is balanced
• it is unbalanced
• it produces an organic substance

Which is NOT an indicator of a chemical change?

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

Which example shows evidence of a chemical change?

• a glass bowl shatters when it hits the floor
• lemonade powder is mixed in water
• an apple is cut for a snack
• milk sours in the refrigerator

What is the ratio of iron atoms to oxygen atoms in the compound for rust (Fe₂O₃)?

• 2:3
• 3:2
• 1:1
• not able to be determined

A subscript tells you...

• the # of atoms in the entire equation
• the # of elements in the equation
• the # atoms of the element it sits behind
• the # of compounds present