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Ch 7 Chemical Rxn
Test Description: N
Instructions: Answer all questions to get your test result.
1) a release of energy is a sign that
A
a physical change has occured
B
a chemical change is taking place
C
organic chemicals are present
D
oxygen is present
2) Fragments of molecules that have at least one electron available for bonding are called
A
orbits
B
radicals
C
protons
D
ions
3) All of the following factors are may speed up a chemical reaction except
A
smaller surface area
B
presence of a catalyst
C
higher temperature
D
higher pressure
4) The substance that is formed in a chemical reaction is called the
A
polymer
B
reactant
C
product
D
radical
5) Which of the following occurs in an endothermic reaction but not in an exothermic reaction
A
energy is absorbed
B
molecules are formed
C
chemical bonds are broken
D
atoms are rearranged
6) A type of reaction that produces an increase in temperature is
A
exothermic
B
endothermic
C
covalent
D
non polar
7) A reaction in which the products contain more chemical energy that the reactants is
A
electrical
B
endothermic
C
exothermic
D
exergonic
8) In a balanced chemical equation , the mass of the reactants is equal to the
A
volume of the reactants
B
atoms in a molecule
C
atomic mass of the elements
D
mass of the products
9) raising the temperature of a system favors the reaction that
A
is exothermic
B
is exergonic
C
releases energy
D
absorbs energy
10) All of these are likely to speed up the rate of reaction except
A
decreasing the surface area
B
increasing the pressure
C
adding a catalyst
D
increasing the temperature
*select an answer for all questions
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