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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
nitrogen
B
oxygen
C
carbon
D
helium
2) Which of the following is the most abundant element found in the Earth's atmosphere?
A
helium
B
oxygen
C
carbon
D
nitrogen
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
on both sides of the equation
B
to the left of the arrow
C
none of the above
D
to the right of the arrow
5) A student observes actions that occurred in four different eggs. Which action describes ONLY a chemical change.
A
a dropped egg
B
a stirred egg
C
a cut up egg
D
a rotting egg
6) Which of the following is a physical change?
A
baking a cake
B
dissolving salt in water
C
burning paper
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
mixing
B
dissolving
C
chemical change
D
physical change
8) Which of the following is a compound?
A
Na
B
CO
C
Al
D
Co
9) Which group of substances below contains only single elements?
A
F, Fe, He
B
C, NaCl, O2
C
H, He, CO
D
none of the above
10) Which is an example of a physical change?
A
the condensation of water vapor on the outside of a cold can of soda
B
burning methane gas to produce water and carbon dioxide
C
the formation of silver sulfide when silver reacts with sulfur in the air
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 nonmetal and a gas.
B
It is a liquid.
C
It is a metalloid.
D
It is a solid.
12) What happens to the molecules in a lump of butter as the butter melts?
A
the molecules pack together more closely and move slower
B
the molecules spread farther apart and move slower
C
the molecules spread farther apart and move faster
D
the molecules pack together more closely and move faster
13) Which of these is the smallest particle of matter?
A
compound
B
molecule
C
atom
D
mixture
14) The variable in a scientific experiment that is measured is called the ______________.
A
control
B
constant
C
independent variable
D
dependent variable
15) Which of the following pieces of lab equipment should be used to measure mass in grams?
A
spring scale
B
beaker
C
triple beam balance
D
graduated cylinder
16) Which of the following pieces of lab equipment should be used to measure weight in newtons?
A
beaker
B
spring scale
C
triple beam balance
D
graduated cylinder
17) Which of the following pieces of lab equipment would be the best choice for measuring 100 ml of water?
A
25ml graduated cylinder
B
25ml Beaker
C
100ml graduated cylinder
D
100ml Beaker
18) Which of these must form when two elements join together during a chemical change?
A
a heterogeneous mixture
B
neutrons
C
electrons
D
a chemical bond
19) Which of the following describes the molecules within a gas?
A
molecules are tightly packed together
B
molecules are very spread out and move fast
C
molecules do not move
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
control
B
constant
C
independent variable
D
dependent variable
*select an answer for all questions
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