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Chemical Reactions Flashcards | StudBud
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Chemical Reactions
Chemical Reactions
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Test review - Chapter 3
Flashcards
20 cards
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Practice quiz
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Questions
20
Answers
1
Which of the following statements explains the equation pictured?
Physical change
Both 1 and 2
Chemical change
Exothermic
2
What type of reaction is pictured?
activation
decomposition
synthesis
replacement
3
What type of reaction is depicted in the photo?
Exothermic
Endothermic
Reducing
Physical
4
NaCl is an example of a chemical
reaction
equation
symbol
formula
5
What type of reaction is depicted in the picture?
replacement
decomposition
synthesis
activation
6
A log burns in a fire place. is this an exothermic or endothermic reaction?
exothermic
????
????
endothermic
7
How would you balance the equation in the photo?
Add the coefficient 3 in front of the water molecule
Add the coefficient 2 in front of the hydrogen
Add the coefficient 2 in front of the water and hydrogen
Add the coefficient 2 in front of the oxygen
8
In the reaction pictured, which substances are compounds and which are elements?
CuOH and Na are elements and NaOH and Cu are compounds.
NaOH and CuOH are compounds and Na and Cu are elements
NaOH and Cu are elements and Na and CuOH are compounds
NaOH and CuOH are elements and Na and Cu are compounds
9
The photo shows the formation of a _________, which is a sign of a chemical reaction.
enzyme
precipitate
gas
substrate
10
Which of the following is an example of how to supply activation energy?
add an inhibitor
heat the reaction
cool the reaction
add a catalyst
11
Hydrogen peroxide that turns into water and oxygen gas is an example of a ____ reaction.
replacement
decomposition
physical
synthesis
12
Chemicals that act as biological catalysts by speeding up reactions in living things are called
inhibitors
enzymes
activators
cells
13
Which of the following is a sign of a chemical reaction?
a solid forms
a change of state
gas bubbles
ice forms
14
What type of reaction is demonstrated in the photo?
Exothermic
Synthesis
Endotermic
Physical
15
How does a catalyst increase reaction rate?
by decreasing activation energy
by increasing the amount of reactant
by increasing particle contact
by increasing activation energy
16
How would you described the equation in the picture?
???
balanced
unbalanced
???
17
Vinegar and baking soda are mixed and the test tube they are in gets colder.
endothermic
???
exothermic
???
18
The principle of conservation of mass is true
only for physical changes
only for open-system reactions
for all reactions
only for closed-system reactions
19
What is a material called that is used to decrease the rate of a chemical reaction?
inhibitor
fuel
enzyme
catalyst
20
Chemistry is
anything that has mass and takes up space
the study of living things
the study of how matter changes
a rapid reaction caused by a fuel
