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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
helium
C
carbon
D
nitrogen
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
to the left of the arrow
B
on both sides of the equation
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
none of the above
C
to the right of the arrow
D
to the left of the arrow
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
Rust forming on a nail
C
dissolving salt in water
D
burning paper
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
chemical change
B
dissolving
C
physical change
D
mixing
8) Which of the following is a compound?
A
CO
B
Na
C
Al
D
Co
9) Which group of substances below contains only single elements?
A
none of the above
B
C, NaCl, O2
C
H, He, CO
D
F, Fe, He
10) Which is an example of a physical change?
A
combining vinegar and baking soda to form a salt and water
B
the condensation of water vapor on the outside of a cold can of soda
C
the formation of silver sulfide when silver reacts with sulfur in the air
D
burning methane gas to produce water and carbon dioxide
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 metalloid.
B
It is a nonmetal and a gas.
C
It is a solid.
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 slower
D
the molecules pack together more closely and move faster
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
dependent variable
B
independent variable
C
control
D
constant
15) Which of the following pieces of lab equipment should be used to measure mass in grams?
A
spring scale
B
graduated cylinder
C
triple beam balance
D
beaker
16) Which of the following pieces of lab equipment should be used to measure weight in newtons?
A
triple beam balance
B
beaker
C
graduated cylinder
D
spring scale
17) Which of the following pieces of lab equipment would be the best choice for measuring 100 ml of water?
A
100ml graduated cylinder
B
25ml Beaker
C
25ml graduated cylinder
D
100ml Beaker
18) Which of these must form when two elements join together during a chemical change?
A
electrons
B
a chemical bond
C
a heterogeneous mixture
D
neutrons
19) Which of the following describes the molecules within a gas?
A
molecules are very spread out and move fast
B
molecules are jumbled and flow past each other
C
molecules do not move
D
molecules are tightly packed together
20) In a scientific experiment the variable that is manipulated by the scientist is called the ______________________.
A
constant
B
dependent variable
C
control
D
independent variable
*select an answer for all questions
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