Science 6 Chapter 4 Test Set 1 Question Preview (ID: 33620)


Chemical Reactions. TEACHERS: click here for quick copy question ID numbers.

Chemistry is
a) a characteristic of a substance that can be observed without changing the substance into another substance
b) the study of matter and how matter changes
c) anything that has mass and takes up space
d) a rapid reaction between oxygen and a substance called fuel

The only sure evidence of a chemical reaction is
a) the formation of a gas
b) a color change
c) the production of one or more new substances
d) changes in properties

A material used to decrease the rate of a chemical reaction is called a(n)
a) inhibitor
b) enzyme
c) catalyst
d) fuel

CaCO₃ represents a chemical
a) symbol
b) formula
c) subscript
d) reaction

Which is the correct chemical equation for: Sodium reacts with oxygen to create sodium oxide.
a) 4Na + O₂ → 2Na₂O
b) 2Na + O₂ → 2NaO
c) Na₂O + O₂ → 2NaO
d) Na₂ + O₂ → Na₂O₂

The principle of conservation of mass is true
a) only for reactions that take place in open systems
b) only for reactions that take place in closed systems
c) for reactions in both open and closed systems
d) matter is not changed

In chemical reactions, what does the principle of conservation of mass mean?
a) Matter is not created or destroyed
b) The total mass of the reactants is greater than the total mass of the products
c) The total mass of the reactants is less than the total mass of the products
d) Matter is not changed

Chemicals that react as biological catalysts by speeding up reactions in living things are called
a) inhibitors
b) enzymes
c) fuels
d) reactants

Which of the following is an example of how to supply activation energy to begin a reaction?
a) Cool the reaction flask in an ice bath
b) Add a catalyst
c) Heat the reaction flask on a hot plate
d) Add an inhibitor

A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of
a) synthesis reaction
b) decomposition reaction
c) replacement reaction
d) precipitate reaction

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