Chapter 3 Quiz Question Preview (ID: 5893)


8th Grade Science. TEACHERS: click here for quick copy question ID numbers.

A reaction in which energy is released is a(n)
a) exothermic reaction
b) endothermic reaction
c) photosynthetic reaction
d) physical reaction

Plants absorb and store some of the energy in sunlight through a series of reactions called
a) fossil fuel combustion
b) fossil fuel formation
c) decomposition
d) photosynthesis

When a chemical bond is broken,
a) energy is released.
b) energy is absorbed.
c) no energy is released or absorbed.
d) energy is either released or absorbed.

Endothermic reactions always
a) absorb energy.
b) release energy.
c) are part of photosythesis.
d) have no change in energy.

Which is not evidence of chemical reactions?
a) gas
b) water
c) precipitate
d) color change

The splitting of water molecules into hydrogen and oxygen molecules is an example of
a) physical change.
b) chemical change.
c) combination reaction.
d) synthesis reaction.

Combustion reactions
a) form precipitate.
b) require glucose
c) require oxygen.
d) destroy atoms.

Which of the following will increase the rate of a reaction?
a) decreasing the concentration
b) decreasing the temperature
c) removing a catalyst
d) breaking the reactants into smaller pieces

What does a catalyst do in a chemical reaction?
a) It is a reactant.
b) It becomes a product.
c) It slows the reaction down.
d) It speeds the reactant up.

A chemical equation must
a) use subscripts.
b) use coefficients.
c) be balanced.
d) show energy.

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