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