WorksheetsCheck-In Review 1
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
A piece of metal is composed of atoms. Each atom in the metal contains 29 protons. How is the metal classified?
a)
as a compound
b)
as an element
c)
as a mixture
d)
as a solution
2.
Why is calcium (Ca) in group 2, period 4 on the periodic table?
a)
Calcium, like all group 2 elements, is nonreactive and a gas at room temperature
b)
Calcium, like all period 4 elements, is nonreactive and a gas at room temperature.
c)
Calcium, like all group 2 elements, is reactive and a solid at room temperature.
d)
Calcium, like all period 4 elements, is reactive and a solid at room temperature.
3.
A copper wire was cut into pieces and dropped into a test tube containing acid. Bubbles formed immediately, the liquid in the test tube turned green, and the pieces of wire were no longer visible. Which most likely happened to the pieces of copper wire?
a)
The copper wire was chemically changed when it was cut and placed in the acid.
b)
The copper wire was physically changed when it was cut and placed in the acid.
c)
The copper wire was physically changed when it was cut and chemically changed when it was placed in the acid.
d)
The copper wire was chemically changed when it was cut and physically changed when it was placed in the acid.
4.
The balanced equation below represents a chemical reaction.
FeS + 2HCl → FeCl2 + H2S
According to the law of conservation of mass, how many hydrogen and chlorine atoms are required for this reaction?
a)
1 hydrogen atom and 1 chlorine atom
b)
1 hydrogen atom and 2 chlorine atoms
c)
2 hydrogen atoms and 1 chlorine atom
d)
2 hydrogen atoms and 2 chlorine atoms
5.
To ensure renewable energy resources, government regulations require logging companies to replant trees after they clear-cut a forest. Why is clear-cutting still a concern for the environment?
a)
It destroys entire habitats.
b)
It usually kills all animal life.
c)
It can cause acid rain to form.
d)
It usually causes the extinction of most plant life.
6.
What will most likely occur if communities around the world increase the amount of wood they burn for heat?
a)
CO2 in the atmosphere will increase.
b)
CO2 in the atmosphere will decrease.
c)
Dissolved oxygen in the water will increase
d)
Dissolved oxygen in the water will decrease
7.
A scientist pours two liquids into a flask and swirls the flask to combine the liquids. The scientist then places the flask on a laboratory workbench. After a few seconds, the liquids separate into layers. How are the contents of the flask classified?
a)
as an element
b)
as a compound
c)
as a homogeneous mixture
d)
as a heterogeneous mixture
8.
Which elements have similar chemical properties?
a)
Na, K, Mg
b)
B, Al, S
c)
N, O, F
d)
He, Ar, Kr
9.
Which distinguishes chemical changes from physical changes?
a)
Physical changes are permanent, while chemical changes are temporary.
b)
Chemical changes produce new substances, while physical changes do not.
c)
Physical changes alter the properties of the substance, while chemical changes maintain the same properties.
d)
Chemical changes result in a change in mass, while physical changes do not.
10.
Two reactants, X and Y, are combined and form a new substance with a mass of 375 g. The mass of reactant X is 300 g. What is the mass of reactant Y?
a)
75 g, because the mass of the reactants equals the mass of the products
b)
175 g, because mass is lost after the chemical reaction
c)
675 g, because the mass of the reactants equals the mass of the products
d)
975 g, because mass is gained after the chemical reaction
11.
What is a possible disadvantage of using a hydroelectric dam as a source of energy?
a)
Hydroelectric dams can harm the aquatic ecosystems both above and below the dam.
b)
Hydroelectric dams can harm the atmosphere by producing toxic gas.
c)
Hydroelectric dams do not produce carbon dioxide emissions.
d)
Hydroelectric dams do not produce radioactive waste.
12.
What is one way to reduce the use of nonrenewable energy resources?
a)
building additional gas-powered factories in rural areas
b)
making more efficient gas-powered automobiles
c)
burning coal instead of wood in a fireplace
d)
mining for coal instead of drilling for oil
13.
A solid powder is composed of molecules containing silver (Ag), nitrogen (N), and oxygen (O) atoms. All of the molecules are identical. How is this substance classified?
a)
as a heterogeneous mixture
b)
as a homogeneous mixture
c)
as a compound
d)
as an element
14.
Which atom has 12 protons?
a)
carbon (C)
b)
nitrogen (N)
c)
sodium (Na)
d)
magnesium (Mg)
15.
A student lights the wick of a candle, and the candle burns for several minutes. The student makes the following observations:
Observation 1: The white candle wick turns black as it burns.
Observation 2: The solid candle wax near the flame transforms into a liquid.
Which choice best compares these two observations?
a)
Observation 1 describes a physical change, and Observation 2 describes a chemical change.
b)
Observation 1 describes a chemical change, and Observation 2 describes a physical change.
c)
Each observation describes a physical change.
d)
Each observation describes a chemical change.
16.
The reactants for a chemical reaction are below:
CH4 + 2O2---- CO2 + 2H2O
If there is one carbon atom at the beginning of the reaction, how many carbon atoms should be present at the end of the reaction?
a)
0
b)
1
c)
2
d)
4
17.
A company discovers a coal reserve under a mountain. The company uses bulldozers to remove soil and flatten the top of the mountain to expose the bedrock. Then, the company uses machines to remove coal from the exposed bedrock. How will obtaining the coal affect the environment?
a)
The removal of soil will increase the rate of erosion, and the removal of coal from the mountain will decrease the volume of carbon dioxide in the atmosphere.
b)
The removal of soil will decrease the rate of erosion, and the removal of coal from the mountain will decrease the volume of carbon dioxide in the atmosphere.
c)
The removal of soil will decrease the rate of erosion, and the flattening of
d)
The removal of soil will decrease the rate of erosion, and the flattening of the mountain will change the direction in which water flows off of the mountain
18.
If a shortage of coal were to cause an increase in coal prices, how would it most likely affect renewable energy sources like solar energy?
a)
The demand for renewable energy resources would increase.
b)
The cost of land for renewable energy resources would decrease.
c)
The need for renewable energy would remain constant as new coal locations are discovered.
d)
The facilities for renewable energy would be built and used at night until all of the coal was depleted.
19.
A scientist tests a water sample that was collected from a river. The results of the test are described below:
The water is clear.
The water contains dissolved calcium.
How should this water sample be classified?
a)
as an element
b)
as a compound
c)
as a homogeneous mixture
d)
as a heterogeneous mixture
20.
Which element has chemical properties most similar to carbon (C)?
a)
lithium (Li)
b)
silicon (Si)
c)
titanium (Ti)
d)
neon (Ne)
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