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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
B movement increases
B
A movement decreases
C
C movement stays the same
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
605 grams
B
45 grams
C
150 grams
3) The following chemical reaction occurs. 2H2O2 → 2H2O + O2 How many atoms of hydrogen are involved in the reaction?
A
4
B
1
C
2
D
8
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
D human blood
B
B sand at the beach
C
C a solution of sugar and water
D
A vegetable oil
6) Which substance is a compound?
A
D water
B
A orange juice
C
B salt water
D
C hydrogen
7) When table salt (NaCl) is produced, which of the following BEST describes the actions of the sodium (Na) and chlorine (Cl) atoms?
A
A Sodium atoms replace chlorine atoms.
B
B Sodium and chlorine atoms mix together.
C
C Sodium atoms dissolve in chlorine atoms.
D
D Sodium and chlorine atoms bond chemically.
8) How are the properties of elements related to the properties of the compounds they make?
A
The properties of the compound are completely different than the properties of the elements.
B
The element in the compound with the largest number of atoms gives the compound its properties.
C
The properties of the compound are always the same as the properties of the elements.
D
The element in the compound with the smallest number of atoms gives the compound its properties.
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 electrons in their nuclei.
B
They have the same number of electrons in their outer energy level.
C
They have the same number of protons in their nuclei.
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 are very unreactive metals.
C
The elements in the group have the same number of electrons.
D
The elements in the group have similar atomic masses
12) Which best describes how the current periodic table is arranged?
A
by atomic number
B
in numerical order by number of neutrons in the nucleus
C
by atomic mass
D
in alphabetical order by element symbol
13) Which best describes elements found in a column of the periodic table?
A
The elements have similar chemical properties.
B
The elements are all found naturally in the same physical state.
C
The elements have the same-size atoms.
D
The elements have the same atomic number.
14) Which best represents a physical property of a substance?
A
change in shape
B
phase change
C
change in mass
D
gas formation
15) Which would provide the best evidence that a chemical reaction had occurred?
A
Acids act as a corrosive to metal.
B
Hydrochloric acid reacts with zinc metal, creating hydrogen gas.
C
Sodium combines with chlorine to create sodium chloride.
D
Gold has a density of 19.3 g/cm3.
16) Which changes when gases condense to form liquids?
A
chemical composition
B
physical state
C
physical mass
D
chemical reactivity
17) Which best represents a balanced equation?
A
2Mg(s) + O2(g) - 2MgO(s)
B
Mg(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
Coal burns without producing greenhouse gases.
B
Compared to other fuels, coal produces more energy per kilogram.
C
Compared to other fuels, coal is relatively cheap and plentiful.
D
Coal is a renewable source of energy.
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 river ecosystems
B
a decrease in the amount of water for irrigation
C
an increase in regional humidity
D
an increase in flooding downstream
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
Developing and maintaining wind farms damages ecosystems.
B
Wind turbines produce excess carbon dioxide.
C
Wind turbines change global weather patterns
D
Power is produced by wind farms using a nonrenewable resource.
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