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WorksheetsChemistry chapter 9
Total questions: 123
Worksheet time: 4hrs 37mins
Name
Class
Date
1.
What type of reaction occurs when two substances combine to form a single product?
a)
A) Decomposition
b)
B) Synthesis
c)
C) Combustion
d)
D) A reaction between a compound and oxygen
2.
Which of the following is an example of a combustion reaction?
a)
A) C2H6 + O2 → CO2 + H2O
b)
B) 2Na + Cl2 → 2NaCl
c)
C) H2SO4 → H2O + SO3
d)
D) Fe + O2 → Fe2O3
3.
In a decomposition reaction, what happens?
a)
A) Two or more products form from a single reactant
b)
B) A single reactant forms two or more products
c)
C) The rearrangement of atoms
d)
D) A new compound replaces a substance
4.
Which of the following is a double-replacement reaction?
a)
A) NaCl + AgNO3 → NaNO3 + AgCl
b)
B) 2Na + Cl2 → 2NaCl
c)
C) 2Na + Cl2 → 2NaCl
5.
Which reaction is an example of a single-replacement reaction?
a)
A) 2Na + Cl2 → 2NaCl
b)
B) NaOH + HCl → NaCl + H2O
c)
C) Combustion
6.
Which of the following reactions represents a synthesis reaction?
a)
B) 2Na + Cl2 → 2NaCl
b)
C) Decomposition
c)
D) Double replacement
7.
In the reaction 2Na + Cl2 → 2NaCl, what type of reaction is this?
a)
A) Decomposition
b)
B) Combustion
c)
C) Synthesis
d)
D) Double replacement
8.
Which of the following reactions is an example of a decomposition reaction?
a)
A) CaCO3 → CaO + CO2
b)
B) NaCl + AgNO3 → NaNO3 + AgCl
c)
C) 2H2O → 2H2 + O2
d)
D) 2Na + Cl2 → 2NaCl
9.
Which of the following is a characteristic of a combustion reaction?
a)
A) Oxygen combines with a substance to produce heat and light
b)
B) A gas is produced
c)
C) Two elements combine to form a compound
d)
D) Combustion
10.
The reaction 2H2O → 2H2 + O2 is an example of:
a)
A) Decomposition
b)
B) Synthesis
c)
C) Combustion
d)
D) Double replacement
11.
In the reaction H2 + Cl2 → 2HCl, what type of reaction occurs?
a)
A) Synthesis
b)
C) Combustion
c)
D) Carbon dioxide
12.
What is always a product in a combustion reaction?
a)
A) Carbon dioxide and water
b)
B) Oxygen
c)
C) Hydrogen
d)
D) NaOH + HCl → NaCl + H2O
13.
Which of the following represents a single-replacement reaction?
a)
A) Zn + 2HCl → ZnCl2 + H2
b)
B) Zn + 2HCl → ZnCl2 + H2
c)
C) Zn + 2HCl → ZnCl2 + H2
d)
D) 4
14.
In the reaction 2Na + Cl2 → 2NaCl, how many atoms of chlorine are involved?
a)
A) 1
b)
B) 2
c)
C) 3
d)
D) The products always have the same number of atoms
15.
Which of the following is not a sign of a chemical reaction?
a)
A) Formation of a gas
b)
B) The formation of a new substance
c)
C) Temperature change
d)
D) No ions are exchanged
16.
What is the product of a decomposition reaction of potassium chlorate?
a)
A) KCl and O2
b)
B) KCl and O3
c)
C) K2O and Cl2
d)
D) Single replacement
17.
What type of reaction occurs when magnesium reacts with oxygen to form magnesium oxide?
a)
A) Synthesis
b)
B) Double replacement
c)
C) Decomposition
d)
D) Combustion
18.
What happens in an exothermic reaction?
a)
A) Heat is absorbed
b)
B) Heat is released
c)
C) Synthesis
d)
D) Carbon dioxide
19.
Which of the following is an example of a replacement reaction?
a)
A) NaCl + AgNO3 → NaNO3 + AgCl
b)
B) Heat is released
c)
C) No heat is involved
d)
D) Sodium chloride
20.
In a combustion reaction, what do the products typically include?
a)
A) Water and carbon dioxide
b)
B) NaCl + AgNO3 → NaNO3 + AgCl
c)
C) H2SO4 → H2O + SO3
d)
D) Water
21.
What happens when hydrogen reacts with oxygen?
a)
A) It forms water
b)
B) Hydrogen and oxygen
c)
C) Hydrogen and oxygen
d)
D) Single-replacement
22.
Which of the following is true about a chemical reaction?
a)
A) The reactants always change state
b)
B) Atoms rearrange / new substances form
c)
C) It forms hydrogen gas
d)
D) Combustion
23.
Which type of reaction is shown by the equation NaCl + AgNO3 → NaNO3 + AgCl?
a)
A) Synthesis
b)
B) Double replacement
c)
C) The mass of the reactants is less than the mass of the products
d)
D) No heat is involved
24.
What is a synthesis reaction?
a)
A) A reaction where a single compound breaks down into two or more products
b)
B) A reaction where two elements combine to form a compound
c)
C) A reaction where a metal replaces another metal in a compound
d)
D) A reaction between a compound and oxygen
25.
Which of the following is an example of a combustion reaction?
a)
A) CH4 + O2 → CO2 + H2O
b)
B) 2Na + Cl2 → 2NaCl
c)
C) H2SO4 → H2O + SO3
d)
D) Fe + O2 → Fe2O3
26.
What type of reaction occurs when a single compound breaks down into two or more elements or new compounds?
a)
A) Two or more products form from a single reactant
b)
B) A single reactant forms two or more products
c)
C) The rearrangement of atoms
d)
D) A gas is produced
27.
In a single-replacement reaction, which of the following occurs?
a)
A) Two elements combine to form a compound
b)
B) One element replaces another element in a compound
c)
C) A compound reacts with oxygen to release energy
d)
D) Two compounds exchange ions
28.
Which of the following is a double-replacement reaction?
a)
A) NaCl + AgNO3 → NaNO3 + AgCl
b)
B) 2Na + Cl2 → 2NaCl
c)
C) H2SO4 → H2O + SO3
d)
D) H2O2 → H2O + O2
29.
What is the product of a synthesis reaction?
a)
A) A single compound
b)
B) Two elements
c)
C) A gas and a solid
d)
D) Water and carbon dioxide
30.
Which of the following reactions is an example of a decomposition reaction?
a)
A) CaCO3 → CaO + CO2
b)
B) NaCl + AgNO3 → NaNO3 + AgCl
c)
C) CaO + CO2 → CaCO3
d)
D) CH4 + O2 → CO2 + H2O
31.
In the reaction 2Na + Cl2 → 2NaCl, what type of reaction is this?
a)
A) Synthesis
b)
B) Combustion
c)
C) Double replacement
d)
D) 2Na + Cl2 → 2NaCl
32.
What does a double-replacement reaction produce?
a)
A) NaOH + HCl → NaCl + H2O
b)
C) NaOH + HCl → NaCl + H2O
c)
D) Combustion
33.
Which of the following is an example of a single-replacement reaction?
a)
A) It involves oxygen and produces heat and light
b)
B) It involves two compounds reacting
c)
C) It forms a precipitate
d)
D) Water
34.
Which of the following is true about exothermic reactions?
a)
A) They absorb energy from the surroundings
b)
B) They release energy to the surroundings
c)
C) Higher concentration increases the rate
d)
D) It absorbs energy from the surroundings
35.
Which reaction is classified as a decomposition reaction?
a)
A) H2O2 → H2O + O2
b)
B) CH4 + O2 → CO2 + H2O
c)
C) NaCl + AgNO3 → NaNO3 + AgCl
d)
D) 2NaCl → 2Na + Cl2
36.
In a combustion reaction, what are the common products formed?
a)
A) Carbon dioxide and water
b)
B) Nitrogen and oxygen
c)
C) A solid
d)
D) Carbon dioxide
37.
What happens in a replacement reaction?
a)
A) A substance reacts with oxygen to form energy
b)
B) A single element replaces another in a compound
c)
C) A single element replaces another in a compound
d)
D) Hydrogen gas
38.
What type of reaction occurs when potassium reacts with water?
a)
A) Combustion
b)
B) Synthesis
c)
C) Single-replacement
d)
D) Sodium chloride and water
39.
What is always a product in combustion reactions?
a)
A) Water
b)
B) Hydrogen and oxygen
c)
D) Combustion
40.
Which of the following is an example of a decomposition reaction?
a)
A) 2NaCl → 2Na + Cl2
b)
C) Oxygen
c)
D) Exothermic
41.
What happens in a double-replacement reaction involving ionic compounds?
a)
A) The cations and anions swap places
b)
B) One compound decomposes
c)
C) Single replacement
d)
D) Double-replacement
42.
What type of reaction produces a precipitate in an aqueous solution?
a)
A) Double-replacement
b)
B) Combustion
c)
C) No ions are exchanged
d)
D) Decomposition
43.
In a synthesis reaction, what happens?
a)
A) 2Na + Cl2 → 2NaCl
b)
B) Decomposition
c)
C) Single-replacement
d)
D) Sodium chloride
44.
Which of the following is an example of a combustion reaction?
a)
A) Single-replacement
b)
B) Water and oxygen
c)
C) Oxygen is added to form an oxide
d)
D) Sodium chloride and water
45.
What is the rate of a chemical reaction?
a)
A) The amount of energy released during the reaction
b)
B) The amount of reactant used up per unit of time
c)
C) The amount of product produced
d)
D) The number of particles in the reaction
46.
Which of the following increases the rate of a chemical reaction?
a)
A) Decreasing temperature
b)
B) Decreasing the concentration of reactants
c)
C) Increasing the surface area of reactants
d)
D) Removing the catalyst
47.
How does temperature affect the rate of a reaction?
a)
A) Higher temperatures decrease the reaction rate
b)
B) Lower temperatures increase the reaction rate
c)
C) Higher temperatures increase the reaction rate
d)
D) Temperature does not affect the reaction rate
48.
What is the effect of concentration on the rate of a chemical reaction?
a)
A) Higher concentration slows the reaction
b)
B) Lower concentration speeds up the reaction
c)
C) Higher concentration speeds up the reaction
d)
D) Concentration does not affect the reaction rate
49.
What role does a catalyst play in a chemical reaction?
a)
A) It decreases the rate of the reaction
b)
B) It is consumed during the reaction
c)
C) It increases the reaction rate without being consumed
d)
D) It does not affect the reaction rate
50.
Which of the following is a characteristic of an exothermic reaction?
a)
A) It absorbs heat from the surroundings
b)
B) It releases heat to the surroundings
c)
C) It requires a catalyst to proceed
d)
D) It does not change temperature
51.
How does surface area affect the rate of reaction?
a)
A) Larger surface area slows down the reaction
b)
B) Smaller surface area speeds up the reaction
c)
C) Larger surface area speeds up the reaction
d)
D) Surface area does not affect the reaction rate
52.
What is an example of a factor that does not affect the rate of a chemical reaction?
a)
A) Temperature
b)
B) Concentration of reactants
c)
C) Volume of the reaction container
d)
D) Presence of a catalyst
53.
Which statement is true about the energy changes during a reaction?
a)
A) Energy is always absorbed in a reaction
b)
B) Exothermic reactions release energy to the surroundings
c)
C) Endothermic reactions release energy
d)
D) Energy does not change during a reaction
54.
Which factor will NOT speed up a chemical reaction?
a)
A) Increasing the temperature
b)
B) Increasing the concentration
c)
C) Decreasing the particle size of the reactants
55.
Which of the following reactions is affected by the presence of a catalyst?
a)
A) Both exothermic and endothermic reactions
b)
B) Only exothermic reactions
c)
C) Only endothermic reactions
d)
D) Neither exothermic nor endothermic reactions
56.
What is the effect of increasing pressure on a reaction involving gases?
a)
A) It slows the reaction rate
b)
B) It speeds up the reaction rate
c)
D) It prevents the reaction from occurring
57.
What is required to start a chemical reaction?
a)
A) Activation energy
b)
B) Energy input from the products
c)
C) No energy is required
d)
D) An increased concentration of products
58.
How does a higher concentration of reactants affect the rate of reaction?
a)
A) It decreases the rate of reaction
b)
B) It has no effect on the rate
c)
C) It speeds up the rate of reaction
d)
D) It only affects exothermic reactions
59.
Which of the following is NOT a factor that affects the rate of reaction?
a)
A) Catalyst presence
b)
B) Temperature
c)
C) Product concentration
d)
D) Reactant concentration
60.
In an endothermic reaction, where does the energy go?
a)
A) It is absorbed from the surroundings
b)
B) It is released to the surroundings
c)
C) It is stored in the reactants
d)
D) It is converted to heat
61.
Which of the following is an example of an endothermic process?
a)
A) Freezing of water
b)
B) Combustion of fuel
c)
C) Photosynthesis
d)
D) Dissolving sodium hydroxide in water
62.
What does the collision theory of reactions state?
a)
A) Particles must collide with enough energy to react
b)
B) Only temperature affects reaction rates
c)
C) Reactions do not require energy
d)
D) Reactions can occur without collisions
63.
Which of the following best defines a chemical reaction?
a)
A) A change in the state of matter
b)
B) A process in which atoms are rearranged to form new substances
c)
C) The absorption of energy by a system
d)
D) A process that only involves physical changes
64.
What happens to the mass of substances involved in a chemical reaction?
a)
A) The mass is lost
b)
B) The mass is gained
c)
C) The mass remains constant
d)
D) The mass is destroyed
65.
What is the law of conservation of mass?
a)
A) Mass can be created and destroyed during a reaction
b)
B) The mass of the products is always greater than the mass of the reactants
c)
C) The total mass of reactants equals the total mass of products
d)
D) Mass is irrelevant in chemical reactions
66.
Which of the following is a characteristic of a chemical change?
a)
A) Change in color
b)
B) Change in state of matter
c)
C) Formation of a new substance
d)
D) All of the above
67.
What is released or absorbed during a chemical reaction?
a)
A) Energy
b)
B) Matter
c)
C) Heat only
d)
D) None of the above
68.
What type of reaction occurs when a compound reacts with oxygen to produce energy?
a)
A) Synthesis
b)
B) Decomposition
c)
C) Combustion
d)
D) Single replacement
69.
Which of the following is an example of a physical change?
a)
A) Burning wood
b)
B) Dissolving sugar in water
c)
C) Cooking an egg
d)
D) Rusting iron
70.
What is the role of a catalyst in a chemical reaction?
a)
A) It speeds up the reaction without being consumed
b)
B) It slows down the reaction
c)
C) It increases the reaction rate without being consumed
d)
D) It increases the temperature of the reaction
71.
In which type of reaction are two or more substances combined to form a single product?
a)
A) Synthesis
b)
B) Decomposition
c)
C) Double replacement
d)
D) Single replacement
72.
What type of reaction occurs when a single reactant breaks down into two or more products?
a)
A) Synthesis
b)
B) Decomposition
c)
C) Double replacement
d)
D) Single replacement
73.
What is produced in a combustion reaction?
a)
A) Water and oxygen
b)
B) Carbon dioxide and water
c)
C) Oxygen and nitrogen
d)
D) Nitrogen and hydrogen
74.
Which of the following reactions represents a decomposition reaction?
a)
A) 2Na + Cl2 → 2NaCl
b)
B) H2O2 → H2O + O2
c)
C) NaOH + HCl → NaCl + H2O
d)
D) CH4 + O2 → CO2 + H2O
75.
What is true about the products in a chemical reaction?
a)
A) They are always more reactive than the reactants
b)
B) They always have more mass than the reactants
c)
C) They are new substances with different properties than the reactants
d)
D) The reactants gain energy but do not release energy
76.
Which of the following is a sign that a chemical reaction has occurred?
a)
A) A color change
b)
B) The formation of a gas
c)
C) The release of heat or light
d)
D) All of the above
77.
What type of reaction occurs when one element replaces another in a compound?
a)
A) Synthesis
b)
B) combustion
c)
C) Single replacement
d)
D) Double replacement
78.
What is required for a chemical reaction to take place?
a)
A) Energy to break bonds
b)
B) A catalyst
c)
C) No energy is required
d)
D) A change in temperature
79.
Which of the following is a product of the reaction between an acid and a base?
a)
A) Water and a salt
b)
B) Hydrogen gas
c)
C) Oxygen and hydrogen
d)
D) Carbon dioxide
80.
Which of the following is a physical property of a substance that can change during a chemical reaction?
a)
A) Color
b)
B) Melting point
c)
C) Boiling point
d)
D) Boiling point
81.
What is always a product of a combustion reaction involving hydrocarbons?
a)
A) Carbon dioxide
b)
B) Oxygen
c)
C) Nitrogen gas
d)
D) Hydrogen gas
82.
Which of the following occurs during a chemical reaction?
a)
A) The rearrangement of atoms to form new substances
b)
B) The atoms of the reactants remain unchanged
c)
C) The products always have the same number of atoms
d)
D) Reactions can occur without collisions
83.
Breaking down a substance into simpler substances
a)
Displacement
b)
Synthesis
c)
Decomposition
d)
Oxidation
84.
Identify the following chemical reaction.
2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double replacement
85.
Identify the following chemical reaction.
3 HBr + 1 Al(OH)3 ----> 3 H2O + 1 AlBr3
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double replacement
86.
Identify the following chemical reaction.
Pb + FeSO4 ----> PbSO4 + Fe
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
87.
What reaction has the following general formula:
AB --> A + B
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
e)
Combustion
88.
What reaction has the following general formula:
A + CD --> C + AD
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
e)
Combustion
89.
What reaction has the following general formula:
AB + CD --> CB + AD
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
e)
Combustion
90.
What reaction has the following general formula:
A + B --> AB
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
e)
Combustion
91.
Which chemical reaction always starts with a hydrocarbon that reacts with oxygen and produces carbon dioxide and water?
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
92.
Which phrase describes what happens to atoms in a chemical reaction?
a)
never lost or gained, just rearranged
b)
sometimes lost, never rearranged
c)
sometimes lost, gained, or rearranged
d)
lost or gained, never rearranged
93.
In a chemical reaction, everything to the right of the arrow are called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
94.
What type of reaction is the equation C + O2 → CO2?
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
95.
What type of reaction is the equation 2NaCl →2Na +Cl2?
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
96.
Cu + 2Ag(NO3) → 2Ag + Cu(NO3)
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
97.
Consider the chemical equation CH4 + 2 O2 → CO2 + 2 H2O. What type of reaction is this?
a)
Synthesis
b)
Combustion
c)
Double Replacement
d)
Decomposition
98.
What are the reactants in the chemical equation pictured?
a)
CH4 and CO2
b)
CH4 and O2
c)
CO2 and H2O
d)
O2 and H2O
99.
3KOH + H3PO4 --> K3PO4 + 3H2O
a)
Combination
b)
Decomposition
c)
Single replacement
d)
Double replacement
100.
2Na +S → Na2S
a)
Double Replacement
b)
Decomposition
c)
Combustion
d)
Synthesis
101.
2 NO2 ---> 2 O2 + N2
a)
Synthesis
b)
Single Replacement
c)
Decomposition
d)
Combustion
102.
What reaction has the following general formula:
CxHy + O2 −>CO2 + H2O
a)
Combination
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
e)
Combustion
103.
What is the correct definition of spectator ions?
a)
Ions that do not participate in a chemical reaction
b)
Ions that are always positively charged
c)
Ions that are only found in acidic solutions
d)
Ions that are only found in solid compounds
104.
Which of the following is the correct net ionic equation for the dissociation of KBr in water?
a)
K(s) + Br(s) → K+(aq) + Br−(aq)
b)
KBr(s) + H2O (l) → K+(aq) + Br−(aq)
c)
KBr(s) → K+(aq) + Br−(aq)
d)
KBr(s) → K+(aq) + Br−(aq) + H2O (l)
105.
In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products?
a)
(s)
b)
(g)
c)
(l)
d)
(w)
106.
What is the solvent in an aqueous solution?
a)
An ionic compound.
b)
Water.
c)
Ions.
d)
Acid.
107.
Split the following compound into its ionic component - K₂S
a)
K²⁺ and S⁻
b)
K⁺ and S²⁻
108.
Is the process of dissolution of sugar a physical or a chemical change?
a)
Physical change.
b)
Chemical change.
109.
The _____is the part that gets dissolved.
a)
solute
b)
solvent
c)
solution
d)
Sacajawea
110.
A solution is a kind of ________.
a)
mixture
b)
compound
c)
element
d)
stuff
111.
The universal solvent is ______.
a)
sodium
b)
acid
c)
water
d)
wind
112.
When one of the parts of the solution is water we call it _________.
a)
water stuff
b)
water mixture
c)
aqua-man
d)
aqueous
113.
____________ is the process whereby particles of a solvent completely surround the particles of a solute, disperse them throughout the solvent particles, and hold them in solution.
a)
solvation
b)
immisciblation
c)
dissolution
d)
saturation
114.
Water dissolves __________ well.
a)
polar substances (like sugar)
b)
nonpolar substances (like oil)
c)
bricks
115.
Water doesn't dissolve __________ well.
a)
polar substances (like sugar)
b)
nonpolar substances (like oil)
c)
ice
116.
How many Hydrogen atoms does a single water molecule have?
a)
1
b)
2
c)
3
d)
4
117.
What is the oxidation number of Fe in FeO?
a)
+1
b)
-1
c)
+2
d)
-2
118.
What is the oxidation number of O in CO2?
a)
+2
b)
-1
c)
+4
d)
-2
119.
What is the oxidation of C in CH4?
a)
-4
b)
-1
c)
+4
d)
+1
120.
What is the oxidation number of Ca in Ca3N2?
a)
+3
b)
+2
c)
-3
d)
-2
121.
What is the oxidation state of Cu in Cu2+?
a)
-1
b)
-2
c)
+2
d)
0
122.
When solutions of two ionic compounds are combined and a solid forms, the process is called
a)
hydration
b)
solvation
c)
dissociation
d)
precipitation
123.
What is the solvent in an aqueous solution?
a)
An ionic compound.
b)
Water.
c)
Ions.
d)
Acid.
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