WorksheetsSpring 2024 Semester Test
Total questions: 75
Worksheet time: 38mins
Each substance to the right of the arrow in a chemical equation is a(n) __________.
Catalyst
Product
Reactant
Inhibitor
The numbers that go before symbols and formulas in a chemical equation are __________.
Superscripts
Subscripts
Catalysts
Coefficients
Substances that speed up chemical reactions are called __________.
Inhibitors
Products
Reactants
Catalysts
A(n) __________ chemical equation has the same number of atoms of each element on each side of the equation.
unbalanced
balanced
simple
complex
If something is burned, a __________ reaction has occurred.
double displacement
single displacement
combustion
synthesis
Why does an increase in temperature result in an increase in reaction rate?
It raises the activation energy
It causes the molecules to increase in size
It decreases the concentration of reactants
It causes an increase in the number of particle collisions
In a chemical equation, the symbol that means dissolved in water is __________.
(s)
(l)
(g)
(aq)
What type of reaction is the following chemical reaction? CH₃CH₂OH + 3O₂ → 2CO₂ + 3H₂O
double-displacement
single-displacement
combustion
synthesis
Which chemical reaction represents a double displacement reaction?
2Na + Cl₂ → 2NaCl
Zn + 2HCl → ZnCl₂ + H₂
2KClO₃ → 2KCl + 3O₂
NaOH + HCl → NaCl + H₂O
When a wood fire burns, it releases heat into the environment. This type of reaction is __________.
endothermic
exothermic
endergonic
exergonic
What does the Law of Conservation of Mass state?
Mass never stays constant
Mass is always added during a chemical change
Mass is always lost during a chemical change
Mass is not lost or created during a chemical change
Which action will NOT increase the rate of a chemical reaction?
Stirring
Putting the substance in a refrigerator
Putting the substance in an oven
Crushing the substance into tiny pieces
Which of the following is a correctly balanced chemical equation?
Cl₂ + 2NaI → 2NaCl + I₂
Cl₂ + NaI → NaCl + I₂
Cl₂ + NaI → NaCl + I
2Cl₂ + NaI → 2NaCl + I₂
Which situation best indicates that a chemical reaction is taking place?
A metal strip bends when heated
A solution freezes in the freezer
Two solutions mixed in a beaker produce a solid
A chemical is dissolved in water
What is NOT an example of a chemical change?
Iron rusting
Cutting paper
An apple ripening
A piece of wood burning
Which equation best represents "magnesium reacting with chlorine to produce magnesium chloride"?
Mg + Cl₂ → MgCl₂
MgCl₂ + Mg → Cl₂
MgCl + Mg → Cl₂
Mg + Cl₂ → MgCl
How many atoms of oxygen are represented in 2Ca(NO₃)₂?
3
6
10
12
What does the symbol (s) indicate when written after a chemical formula?
Solid
Soluble
Solution
Synthesis
What is a solid produced from two liquids in a double displacement chemical reaction called?
Reactant
Precipitate
Crystal
Molecule
What type of bond is formed when two atoms share electrons?
Covalent bond
Ionic bond
Metallic bond
Electron bond
Which pair of atoms is more likely to form an ionic bond?
C and O
C and H
Ca and Mg
Ca and Br
What is the oxidation number of oxygen in most compounds?
-2
-1
0
8
Which formula represents a substance that contains covalent bonds?
LiCl
CaCl2
K2O
CO2
What is the regular arrangement of atoms, ions, or molecules in a solid?
A compound
A crystal
Impossible to break
A polyatomic ion
How many electrons does an aluminum ion lose to become Al3+?
1 electron
2 electrons
3 electrons
4 electrons
How many electrons are shared in a double covalent bond?
1
2
4
6
Which atoms are most likely to form covalent bonds?
Metal atoms that share electrons
Metal atoms that share protons
Nonmetal atoms that share electrons
Nonmetal atoms that share protons
What are the electrons that are lost, gained, or shared in chemical bonds called?
Valence electrons
Chemical electrons
Lewis electrons
None of the above
Which of the following is NOT an example of covalent bonding?
H2O
NaF
NH3
O2
How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?
2
4
6
8
Which of the following is an example of a molecule?
H₂O
NaF
Mg₃N₂
All of the above are molecules
How many electrons are being shared in a triple bond?
3
6
8
12
Which of the following is the reason why atoms of sodium and chlorine attract each other in a salt crystal?
Sodium has a positive charge and chlorine has a negative charge
Sodium has a negative charge and chlorine has a positive charge
Both have a positive charge
Both have a negative charge
Atoms of the same element that have different numbers of neutrons are called what?
molecules
ions
protons
isotopes
What is the total number of electrons in the outer shell of a sodium atom?
1
2
8
18
Which particles determine the atomic number of an element?
Protons only
Neutrons and protons
Neutrons only
Protons and electrons
The total number of neutrons in the nucleus of any atom is equal to the
mass number of the atom
atomic number of the atom
atomic number minus the mass number
mass number minus the atomic number
Two different isotopes of an element have the same what?
numbers of neutrons
numbers of protons
mass numbers
nothing is the same about them
What is the maximum number of electrons that can occupy the 2nd shell of an atom of magnesium?
1
2
8
18
Which of the following is a transition metal?
Calcium
Nickel
Aluminum
Tellurium
An atom is neutral because
neutrons balance the protons and electrons
nuclear forces stabilize the charges
the numbers of protons and electrons are equal
the numbers of protons and neutrons are equal
An unstable nucleus results from too many or too few what?
neutrons
protons
electrons
radons
Which part of the periodic table indicates the number of energy levels in the electron cloud?
Group
Family
Valence electrons
Period
Which statement about the arrangement of the periodic table is not true?
Noble gases are in the group farthest to the right
Metals are found on the left side of the periodic table
Rare earth elements are in the first column on the left
Transition metals are in the center of the periodic table
Which of the following elements would be the best conductor of electricity?
Iodine
Silicon
Silver
Argon
Which of the following elements would be the most reactive?
Iodine
Silicon
Silver
Argon
Which of the following elements would be the least reactive?
Iodine
Silicon
Silver
Argon
At room temperature, most metals are _______.
Solids
Liquids
Gases
Plasma
Matter that has a definite volume and a definite shape is a _______.
solid
liquid
gas
plasma
The amount of energy needed to change a material from a liquid to a gas is the heat of _______.
evaporation
fusion
vaporization
condensation
When two or more substances are physically combined, the result is a(n) _______.
chemical change
element
compound
mixture
The air that you breathe is an example of a(n) _______.
solid
liquid
gaseous
plasma
As a sample of matter is heated, its particles _______.
are unaffected
move more quickly
move more slowly
stop moving
The most common state of matter in the universe is _______.
solid
liquid
gas
plasma
The color of ink is a _______.
physical change
physical property
chemical change
chemical property
Which process involves sawing wood, crushing a can, and burning a marshmallow?
Physical change
Chemical change
State change
Phase transition
What is an example of a physical change?
Rust
Bubbles
Broken glass
Formation of a solid
Which of the following is not considered a physical property?
Color
Odor
State
Reactivity with oxygen
What type of matter allows particles to move freely in all directions until they spread evenly throughout their container?
Solid
Liquid
Gas
Plasma
What is another term for a homogeneous mixture?
Liquid
Substance
Suspension
Solution
What is the amount of energy needed to change a material from the solid state to the liquid state called?
Condensation
Vaporization
Fusion
Evaporation
Hydrogen, gold, and iron are all examples of what?
Homogeneous mixtures
Heterogeneous mixtures
Elements
Compounds
What type of matter is formed by chemically joining two or more elements?
Compound
Solution
Colloid
Suspension
Milk, paint, and mayonnaise are all examples of what?
Homogeneous mixtures
Heterogeneous mixtures
Compounds
Elements
Refraction occurs when a wave changes its __________ as it passes through a different medium.
Speed
Direction
Frequency
Amplitude
What property of sound is primarily affected by the material of the floor in a house?
Absorption
Diffraction
Reflection
Refraction
Which type of wave is a compressional wave?
X-ray
Gamma ray
Sound wave
Water wave
What happens when the amplitude of a sound wave increases?
It becomes louder
It has a higher pitch
It travels faster
It produces beats
What is the velocity of a wave with a frequency of 25 Hz and a wavelength of 10 m?
2.5 m/s
35 m/s
250 m/s
0.4 m/s
What phenomenon occurs when light bends as it passes through a different medium?
Reflection
Refraction
Diffraction
Interference
What is the term for the bending of light waves as they bend around an object?
Reflection
Refraction
Diffraction
Interference
All electromagnetic waves:
have the same wavelength
have the same frequency
travel at 300,000,000 m/s
have the same energy
Gamma rays are dangerous because they:
fluoresce
cause sunburn
can break down molecules and cells
cause food to spoil
If the angle of reflection is 25 degrees, the angle of incidence is:
0 degrees
25 degrees
60 degrees
90 degrees
Which of the following would sound waves have the greatest speed traveling through?
a hot pan
a cold pan
hot tub water
Alaskan air
