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Reactions Test 50
By Jonathan Klinginsmith
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Last updated about 6 years ago
33 questions
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Question 1
1.
Each substance to the right of the arrow in a chemical equation is a
product
reactant
Question 2
2.
The numbers that go before symbols and formulas in a chemical equation are
superscript
coefficients
Question 3
3.
Substances that speed up chemical reactions are called
reactants
catalysts
Question 4
4.
A blank chemical equation has the same number of atoms of each element on each side of the equation.
balanced
simple
Question 5
5.
If something is burned, a blank reaction has occurred.
single displacment
combustion
Question 6
6.
Why does an increase in temperature result in an increase in reaction rate?
it decreases the concentration of reactants
it causes an increase in the number of particle collisions
Question 7
7.
If energy must be ADDED to a chemical reaction for the reaction to take place, the reaction is blank.
endergonic
endothermic
Question 8
8.
In a chemical equation, this symbol means dissolved in water
L
AQ
Question 9
9.
What type of reaction needs oxygen and produces carbon dioxide and water vapor?
combustion
synthesis
Question 10
10.
NaOH and HCL produces NaCl + H20 is a double displacement reaction.
True
False
Question 11
11.
A teacher wants to demonstrate a chemical reaction for her students. Which activity would best demonstrate a chemical reaction?
placing metal in an acid to greate gas
filling a balloon with helium gas
Question 12
12.
When a wood fire burns, it releases heat into the environment. This type of reaction is blank.
endothermic
exothermic
Question 13
13.
The law of conservation of Mass states
mass is always lost during a chemical change
mass is not lost or created during a chemical change
Question 14
14.
Which of the following observation does NOT indicate that a chemical reaction has occurred?
Changes shape
heat and light released
Question 15
15.
Which situation provides the best evidence that a chemical reaction is taking place?
a solution freezes in the freezer
two solutions mixed in a beaker produce a solid
Question 16
16.
A substance that is an ingredient in a chemical reaction is called a blank.
product
reactant
Question 17
17.
Hydrogen reacts with oxygen to produce water; which substances are the reactants?
oxygen only
water only
both hydrogen and oxygen
Question 18
18.
The S symbol written after a formula in a chemical equation stands for blank?
solid
soluble
Question 19
19.
A solid produced from two liquids in a double displacment chemical reaction is called a blank.
precipitate
molecule
Question 20
20.
To balance a chemcial equation, it may be neccessary to adjust the
coefficents
subscripts
Question 21
21.
Balance the equation
visibility
View drawing
Question 22
22.
What type of reaction is number twenty one?
Double Replacement
Single Replacement
Question 23
23.
Balance the equation
visibility
View drawing
Question 24
24.
What type of reaction is number twenty three?
Synthesis
Decomposition
Question 25
25.
Balance the equation
visibility
View drawing
Question 26
26.
What type of reaction is number twenty five?
Synthesis
Single Replacement
Question 27
27.
Balance the equation
visibility
View drawing
Question 28
28.
What type of reaction is number twenty seven?
Double Replacement
Single Replacement
Question 29
29.
Balance the equation
visibility
View drawing
Question 30
30.
What type of reaction is number twenty nine?
Double Replacement
Single Replacement
Question 31
31.
The more concentrated a solution is, the slower the reaction rate
True
False
Question 32
32.
an Endothermic reaction absorbs energy
True
False
Question 33
33.
An exothermic reaction releases energy
True
False