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Chemical Reactions
Test Description: Chemical Reaction Unit Test Review
Instructions: Answer all questions to get your test result.
1) Which of the following best describes a mixture?
A
A combination of two or more substances that are not chemically combined
B
A single element with unique properties
C
A pure substance that cannot be separated
D
A pure substance that cannot be separated
2) If I add vinegar to baking soda, a chemical reaction takes place and carbon dioxide is produced. Which of the following will increase the speed of the chemical reaction?
A
decrease the concentration of the vinegar
B
use an inhibitor
C
increase the temperature of the vinegar
D
decrease the surface area of the baking soda
3) David watches a burning candle to determine whether a chemical reaction is taking place. Which of these observations shows evidence of a chemical reaction?
A
The color of the candle is blue.
B
The wax is melting.
C
The candle gives off light and heat.
D
The candle is in a glass jar.
4) In a chemical reaction, if more energy is required to make the chemical bonds than to break them apart, the reaction is endothermic, so we see a
A
increase in temperature
B
Decrease in temperature
C
Exothermic
D
no change in temperature
5) Which of the following is an example of a homogenous mixture?
A
milk
B
trail mix
C
salad dressing
D
pizza
6) An example of a heterogenous mixture is
A
ocean water
B
pepperoni pizza
C
lemonade
D
chocolate milk
7) What is an example of a colloid?
A
Milk
B
Snow Globe
C
Oil and Water
8) __________ is known as the universal solvent because it dissolves more solutes than any other solvent.
A
Salt
B
Water
C
Hydrochloric acid
D
Vinegar
9) A solute is different than a solvent because a SOLUTE...
A
is always a liquid. ex: coffee
B
is the thing that dissolves another substance. ex: water
C
is the thing that creates a chemical reaction. ex: heat
D
is the thing that is getting dissolved. ex: sugar
10) A compound is a substance that can be broken down into simpler substances and is made from atoms of two or more elements. Which of the following is not a compound?
A
carbon dioxide
B
glucose
C
gold
D
table salt
11) Which of the following is the best example of a suspension?
A
Rocks in a glass of water
B
Sugar dissolved in water
C
Milk and water stirred together
D
Oil floating on top of water
12) The choices below list one example of a physical change and two examples of a chemical change. Which is a physical change?
A
A candle is burned, and gives off heat and light
B
Water turns to ice
C
Carbon dioxide forms when baking soda is added to vinegar
13) Mr. Bowman’s science class is learning that substances can change in many ways. Sometimes a change will produce a new substance. This is called a chemical change. Which of the following is an example of a chemical change?
A
egg frying in a pan
B
paper being cut
C
water freezing into ice
D
lump of play dough being broken in two
14) A chemical change differs from a physical change because in a chemical change a substance
A
changes into another substance.
B
changes into another state of matter
C
changes shape
D
changes color.
15) According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
A
The mass of products is sometimes greater
B
There is no relationship.
C
The masses are always equal.
D
The mass of reactants is greater
16) The fire in a fireplace is an example of an exothermic reaction. Explain what happens in an exothermic reaction.
A
heats up. absorbs energy
B
heats up, has no energy
C
heats, up releases energy
D
heats up only
17) Endothermic is
A
this is hurts my brain
B
when energy is absorbed
C
when energy is released
D
when energy has a party
18) When chemical reactions break down a complex compound into two or more simpler compounds we call this kind of chemical reaction ______.
A
decomposition
B
not cool
C
cool
D
synthesis
19) synthesis
A
combining 2 or more things
B
built
C
the study of the ocean
D
come to the front
20) Which equation represents a single replacement reaction?
A
2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g)
B
2Al(s) + 3Cl2(g) → 2AlCl3(s)
C
AlCl3(aq) + 3KOH(aq) → Al(OH)3(s) + 3KCl(aq)
D
2AlCl3(s) → 2Al(s) + 3Cl2(g)
*select an answer for all questions
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