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Semester One Review PART ONE
Test Description: It is
Instructions: Answer all questions to get your test result.
1) Which of the following elements makes up about 21% of the Earth's atmosphere?
A
oxygen
B
nitrogen
C
helium
D
carbon
2) Which of the following is the most abundant element found in the Earth's atmosphere?
A
carbon
B
nitrogen
C
oxygen
D
helium
3) The reactants in a chemical equation are located _________________________.
A
on both sides of the equation
B
to the left of the arrow
C
to the right of the arrow
D
none of the above
4) The products in a chemical equation are located _____________.
A
to the right of the arrow
B
to the left of the arrow
C
on both sides of the equation
D
none of the above
5) A student observes actions that occurred in four different eggs. Which action describes ONLY a chemical change.
A
a cut up egg
B
a rotting egg
C
a stirred egg
D
a dropped egg
6) Which of the following is a physical change?
A
baking a cake
B
burning paper
C
dissolving salt in water
D
Rust forming on a nail
7) When copper reacts with oxygen in the air, a color change takes place that turns the surface of the copper green. What type of change occurs to produce this color change?
A
dissolving
B
mixing
C
physical change
D
chemical change
8) Which of the following is a compound?
A
CO
B
Al
C
Co
D
Na
9) Which group of substances below contains only single elements?
A
H, He, CO
B
C, NaCl, O2
C
F, Fe, He
D
none of the above
10) Which is an example of a physical change?
A
the formation of silver sulfide when silver reacts with sulfur in the air
B
the condensation of water vapor on the outside of a cold can of soda
C
burning methane gas to produce water and carbon dioxide
D
combining vinegar and baking soda to form a salt and water
11) An element appears in the far right column of the periodic table. What can you conclude about the element based on this information?
A
It is a solid.
B
It is a metalloid.
C
It is a nonmetal and a gas.
D
It is a liquid.
12) What happens to the molecules in a lump of butter as the butter melts?
A
the molecules spread farther apart and move faster
B
the molecules spread farther apart and move slower
C
the molecules pack together more closely and move faster
D
the molecules pack together more closely and move slower
13) Which of these is the smallest particle of matter?
A
compound
B
atom
C
molecule
D
mixture
14) The variable in a scientific experiment that is measured is called the ______________.
A
constant
B
control
C
dependent variable
D
independent variable
15) Which of the following pieces of lab equipment should be used to measure mass in grams?
A
beaker
B
graduated cylinder
C
spring scale
D
triple beam balance
16) Which of the following pieces of lab equipment should be used to measure weight in newtons?
A
graduated cylinder
B
triple beam balance
C
spring scale
D
beaker
17) Which of the following pieces of lab equipment would be the best choice for measuring 100 ml of water?
A
100ml Beaker
B
25ml graduated cylinder
C
100ml graduated cylinder
D
25ml Beaker
18) Which of these must form when two elements join together during a chemical change?
A
a heterogeneous mixture
B
a chemical bond
C
neutrons
D
electrons
19) Which of the following describes the molecules within a gas?
A
molecules do not move
B
molecules are tightly packed together
C
molecules are very spread out and move fast
D
molecules are jumbled and flow past each other
20) In a scientific experiment the variable that is manipulated by the scientist is called the ______________________.
A
constant
B
control
C
dependent variable
D
independent variable
*select an answer for all questions
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