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Physical Science
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Instructions: Answer all questions to get your test result.
1) In a chemical reaction, what is the best description of a molecule’s movement when the temperature decreases?
A
C movement stays the same
B
B movement increases
C
A movement decreases
2) A chemistry teacher combines 20 grams of lemon juice with 25 grams of baking soda in a flask covered with a balloon. The flask and balloon have a combined mass of 105 grams. What is the mass of the entire setup after a reaction has occurred?
A
45 grams
B
150 grams
C
605 grams
3) The following chemical reaction occurs. 2H2O2 → 2H2O + O2 How many atoms of hydrogen are involved in the reaction?
A
4
B
2
C
8
D
1
4) Iron filings are thrown into a pile of sand. What is the best way to separate this mixture?
A
Sift through the sand for all of the iron.
B
Use a magnet to pick up the sand.
C
Use a magnet to pick up the iron filings.
D
Evaporate the sand
5) Which best represents a heterogeneous mixture?
A
A vegetable oil
B
D human blood
C
B sand at the beach
D
C a solution of sugar and water
6) Which substance is a compound?
A
C hydrogen
B
A orange juice
C
D water
D
B salt water
7) When table salt (NaCl) is produced, which of the following BEST describes the actions of the sodium (Na) and chlorine (Cl) atoms?
A
C Sodium atoms dissolve in chlorine atoms.
B
D Sodium and chlorine atoms bond chemically.
C
B Sodium and chlorine atoms mix together.
D
A Sodium atoms replace chlorine atoms.
8) How are the properties of elements related to the properties of the compounds they make?
A
The element in the compound with the largest number of atoms gives the compound its properties.
B
The element in the compound with the smallest number of atoms gives the compound its properties.
C
The properties of the compound are completely different than the properties of the elements.
D
The properties of the compound are always the same as the properties of the elements.
9) Which element is the least reactive?
A
Hydrogen
B
Carbon
C
Iodine
D
Helium
10) Why are certain elements placed into the same column on the periodic table?
A
They have the same number of protons in their nuclei.
B
They have the same number of electrons in their nuclei.
C
They have the same number of electrons in their outer energy level.
11) Which of these is one similarity of the elements in the first group of the periodic table?
A
The elements in the group react with oxygen in similar ways.
B
The elements in the group have the same number of electrons.
C
The elements in the group are very unreactive metals.
D
The elements in the group have similar atomic masses
12) Which best describes how the current periodic table is arranged?
A
in alphabetical order by element symbol
B
by atomic number
C
by atomic mass
D
in numerical order by number of neutrons in the nucleus
13) Which best describes elements found in a column of the periodic table?
A
The elements have the same atomic number.
B
The elements have the same-size atoms.
C
The elements are all found naturally in the same physical state.
D
The elements have similar chemical properties.
14) Which best represents a physical property of a substance?
A
change in mass
B
gas formation
C
change in shape
D
phase change
15) Which would provide the best evidence that a chemical reaction had occurred?
A
Gold has a density of 19.3 g/cm3.
B
Hydrochloric acid reacts with zinc metal, creating hydrogen gas.
C
Sodium combines with chlorine to create sodium chloride.
D
Acids act as a corrosive to metal.
16) Which changes when gases condense to form liquids?
A
chemical composition
B
chemical reactivity
C
physical state
D
physical mass
17) Which best represents a balanced equation?
A
Mg(s) + O2(g) -2MgO(s)
B
2Mg(s) + O2(g) - 2MgO(s)
C
Mg(s) + 2O2(g) - 2MgO(s)
18) Which statement BEST explains why coal is used to generate electricity despite the amount of pollution produced by burning coal?
A
Compared to other fuels, coal is relatively cheap and plentiful.
B
Coal burns without producing greenhouse gases.
C
Coal is a renewable source of energy.
D
Compared to other fuels, coal produces more energy per kilogram.
19) The construction of Hoover Dam on the Colorado River resulted in abundant fresh water and electrical power for the region. Which of these is a disadvantage of the construction of Hoover Dam?
A
a decrease in the amount of water for irrigation
B
an increase in regional humidity
C
an increase in flooding downstream
D
a decrease in the amount of river ecosystems
20) Wind farms use turbines to generate electricity without using fossil fuels. What is one negative consequence of using wind turbines to generate electricity?
A
Wind turbines change global weather patterns
B
Wind turbines produce excess carbon dioxide.
C
Developing and maintaining wind farms damages ecosystems.
D
Power is produced by wind farms using a nonrenewable resource.
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