Ch 9, 8th Grade Question Preview (ID: 29044)


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

Chemical changes do NOT result in a new substance being formed.
a) true
b) false
c)
d)

Which is a sign that a chemical reaction is taking place?
a) the release of light and sound
b) a change in color
c) fizzing/bubbling
d) all of the above

How do you know for sure that a chemical reaction is taking place?
a) the presence of bubbles
b) a change in temperature
c) studying the substance before and after the reaction
d) all of the above

What happens in a chemical reaction?
a) atoms rearrange and form new substances
b) a substance changes physical properties only
c) substances retain all their original properties
d) all of the above

The substances to the left of the arrow in a chemical equation are called the
a) products
b) reactants
c) subscripts
d) coefficients

The total mass before a chemical reaction is the same after a chemical reaction. This is the law of
a) conservation of energy
b) conservation of mass
c) conservation of temperature
d) conservation of reactants

Whose research contributed to the law of conservation of mass?
a) Antoine Lavoisier
b) Marie and Pierre Curie
c) Anton von Leeuwenhoek
d) Henri Becquerel

A number placed in front of an element symbol or chemical formula is called a
a) coefficient
b) subscript
c) product
d) reactant

A reaction in which two or more substances combine and form one compound is called a
a) decomposition
b) single replacement
c) double replacement
d) synthesis

A reaction in which a single reactant breaks down into two or more products is called a
a) double replacement
b) decomposition
c) single replacement
d) combustion

Negative ions in 2 compounds switch places in which kind of reaction?
a) double replacement
b) single replacement
c) combustion
d) synthesis

What happens to energy when a chemical bond is broken?
a) it is released
b) it is created
c) it is destroyed
d) it is absorbed

In an exothermic reaction, energy is...
a) absorbed
b) released
c) created
d) destroyed

The minimum amount of energy needed to start a chemical reaction is called
a) starting energy
b) beginning energy
c) activation energy
d) reaction energy

We can make a chemical reaction occur faster if we
a) increase the temperature
b) increase the concentration
c) increase the surface area
d) all of the above

When a catalyst is added to a reaction, it is considered a reactant.
a) True
b) False
c)
d)

A catalyst that speeds up chemical reactions in living cells is called a(n)
a) enzyme
b) inhibitor
c) hormone
d) preservative

A preservative is an example of a(n)
a) enzyme
b) catalyst
c) inhibitor
d) protein

A description of a reaction using element symbols and chemical formulas is called a
a) chemical symbol
b) chemical formula
c) chemical reaction
d) chemical equation

A reaction that absorbs energy is called
a) endothermic
b) exothermic
c) absorbothermic
d) thermal

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