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