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WorksheetsChemistry Eoc Exam
Total questions: 23
Worksheet time: 46mins
What is the chemical formula for magnesium bromate?
MgBr
MgBr2
MgBrO3
Mg(BrO3)2
How are compounds with metallic bonds similar to ionic compounds?
Both tend to have double and triple bonds.
Both tend to have low boiling points.
Both tend to have poor conductivity.
Both tend to have high melting points.
Which of these elements has the greatest atomic radius?
H
Cl
N
Cs
How does the amount of heat energy change as a 250-g sample of water is heated from 5.0°C to 30.0°C?
The amount of heat energy increases, causing the water to sublime.
The amount of heat energy increases, causing the water to evaporate.
As the temperature increases, the amount of heat energy decreases.
As the temperature increases, the amount of heat energy increases.
This graph represents data collected when a sample of a gas is uniformly cooled from 155°C. Why does the temperature of the sample remain constant between point X and
point Y? (phase changes/cooling/heating curves)
because the sample is transitioning from a gaseous state to a solid state
because the sample is transitioning from a gaseous state to a liquid state
because the sample is transitioning from a solid state to a gaseous state
because the sample is transitioning from a liquid state to a solid state
The phases of a substance under various pressure and temperature combinations are shown on this phase diagram. What occurs if the pressure of the substance at point F remains constant, and the temperature increases to point G? (phase changes and phase diagrams)
It will transition from a solid state to a liquid state.
It will transition from a liquid state to a solid state.
It will transition from a solid state to a gaseous state.
It will transition from a gaseous state to a solid state.
The potential energy diagram of a chemical reaction is shown . Which best describes the energy in the chemical reaction? (energy diagrams/Activation Energy)
Heat energy was released.
Energy was lowered by a catalyst.
8 J of energy were required to start the reaction.
10 J of energy were required to start the reaction.
This balanced chemical equation represents a chemical reaction: 6NO + 4NH3 → 5N2 + 6H2O
What volume of NH3 gas, at Standard Temperature and Pressure (STP), is required to react with 15.0 g of NO? (Stoichiometry)
5.68 L
7.47 L
10.0 L
11.2 L
The equation represents a chemical reaction at equilibrium.
HCl (aq) + Mg (s) → MgCl2 (aq) + H2 (g) + heat
What happens to the system when the temperature is decreased? (reversible reactions)
The reaction shifts toward the right, and the amount of hydrogen gas increases.
The reaction shifts toward the right, and the amount of hydrogen gas decreases.
The reaction shifts toward the left, and the amount of hydrogen gas
increases.
The reaction shifts toward the left, and the amount of hydrogen gas
decreases.
This equation represents a chemical reaction at equilibrium:
2SO2 (g) + O2 (g) ↔2SO3 (g)
What will happen when the concentration of SO3 is increased? (reversible reactions)
The reaction shifts to the right, and concentrations of SO2 (g) and O2 (g) decrease.
The reaction shifts to the right, and concentrations of SO2 (g) and O2 (g) increase.
The reaction shifts to the left, and concentrations of SO2 (g) and O2 (g) decrease.
The reaction shifts to the left, and concentrations of SO2 (g) and O2 (g) increase.
A student conducts an experiment to identify the pH of some common household substances. The data is recorded in this table. Which substance would be classified as containing the highest concentration of hydroxide ions? (Acids/Base, hydroxide ions (OH-) versus Hrydonium (H3O+)
Ammonia
Drain Cleaner
Lemon Juice
Vinegar
A newly synthesized ionic compound is placed in water to make an aqueous solution. Which best describes the new ionic solution?
The ionic solution conducts electricity.
The ionic solution dissolves nonpolar solutions.
The ionic solution cannot conduct electricity.
The ionic solution is a neutral solution.
Why is potassium chloride able to dissolve in water? (intermolecular forces (polar bonding) and Solutions)
because potassium ions are attracted to the partial negative charge of hydrogen
because potassium ions are attracted to the partial positive charge of hydrogen
because potassium ions are attracted to the partial negative charge of oxygen
because potassium ions are attracted to the partial positive charge of oxygen
Which occurs if an electron transitions from n = 5 to n = 2 in a hydrogen atom?
Energy is absorbed, and visible light is emitted.
Energy is released, and visible light is emitted.
Energy is released, and visible light is not emitted.
Energy is absorbed, and visible light is not emitted.
When a gamma ray is emitted by an element, what happens to the atomic mass and the atomic number? (Nulcear equations)
The atomic mass stays the same, and the atomic number stays the same.
The atomic mass stays the same, and the atomic number stays the same.
The atomic mass stays the same, and the atomic number changes
The atomic mass changes, and the atomic number changes.
How does a single covalent bond between two carbon atoms compare to a double covalent bond between two carbon atoms?
A single covalent bond is stronger and has a longer bond length than a double covalent bond.
A single covalent bond is stronger and has a shorter bond length than a double covalent bond.
A single covalent bond is weaker and has a shorter bond length than a double covalent bond.
A single covalent bond is weaker and has a longer bond length than a double covalent bond.
How do the three isotopes Sn-116, Sn-118, and Sn-119 differ?
Sn-116 has 166 neutrons, Sn-118 has 168 neutrons, and Sn-119 has 169 neutrons.
Sn-116 has 116 neutrons, Sn-118 has 118 neutrons, and Sn-119 has 119 neutrons.
Sn-116 has 66 neutrons, Sn-118 has 68 neutrons, and Sn-119 has
69 neutrons.
Sn-116 has 50 neutrons, Sn-118 has 52 neutrons, and Sn-119 has
53 neutrons.
Which molecule contains a triple bond? (Lewis Structures/Bond Table/HONC rule)
F2
O2
Cl2
N2
Which of these compounds will form a precipitate when mixed with an aqueous solution of sodium sulfate, Na2SO4?
LiNO3
KNO3
Mg(NO3)2
Ba(NO3)2
Solid chromium(II) reacts with oxygen gas to form solid CrO. What is this type of reaction?
decomposition
synthesis
single replacement
double replacement
Which element has 8 valence electrons?
Potassium
Oxygen
Helium
Neon
How are the bonds formed in a polar covalent compound?
Electrons are shared unequally.
Electrons are shared equally.
Electrons are gained.
Electrons are lost.
In a chemical reaction, how does increasing the temperature of the reactants affect the reaction process?
The reactants absorb more heat, which turns them into products faster.
The activation energy is decreased, which makes the reaction proceed faster.
The kinetic energy of the reactants increases, causing more effective collisions.
The particles break down faster, increasing the surface area and the
reaction rate.
