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WorksheetsChemical Reactions and pH Review
Total questions: 59
Worksheet time: 30mins
What does the pH scale measure?
Temperature
Concentration of H+ ions
Number of atoms in a molecule
Amount of dissolved solids
A solution with a pH of 2 is best described as...
Neutral
Acid
Base
A solution with a pH of 7 is...
Neutral
Acid
Base
As pH decreases, the concentration of H+ ions...
Increases
Stays the same
Decreases
Changes randomly
Which of the following pH values is the most basic?
1
4
6
10
If a solution changes from a pH 6 to a pH 4, it becomes...
10X more acidic
100X more acidic
10X more basic
100X more basic
Which of these is an acid?
Baking soda
Soap
Lemon juice
Water
The pH scale ranges from...
-5 to 5
0 to 14
1 to 100
-14 to 14
What ion is found in basic solutions?
H+
OH-
Na+
Cl-
What is an element?
A pure substance made of only one kind of atom.
A substance made of two atoms bonded together.
A mixture of multiple compounds.
A molecule made of different elements.
Which of the following is a molecule? (Select all that apply)
O₂
CO₂
NaCl
Fe
What is a compound?
A pure substance made of two or more different elements chemically bonded.
A mixture of elements physically combined.
A single atom.
A molecule made of the same element.
Which formulas represent elements? (Select all that apply)
He
N₂
H₂O
CO₂
Which formulas represent compounds? (Select all that apply)
H₂O
NaCl
O₃
Fe
Which of the following is NOT a sign of a chemical reaction?
Change in temperature
Change in color
Gas production
Melting ice cube
What does a subscript represent?
The number of atoms of that element.
The number of molecules.
The coefficient.
The charge.
Which are signs of a chemical reaction? (Select all that apply)
Odor change
Temperature change
Dissolving sugar
Production of a solid (precipitate)
What is the reactant side of a chemical equation?
The starting substances before the reaction.
The substances formed after the reaction.
The subscript.
The catalyst.
What is the product side of a chemical equation?
The substances formed by the reaction.
The substances that are used up.
Only gases.
Only solids.
What type of reaction is A + B → AB?
Decomposition
Synthesis
Single replacement
Combustion
What type of reaction is AB → A + B?
Synthesis
Single replacement
Decomposition
Double replacement
What type of reaction is AB + C → AC + B?
Synthesis
Single replacement
Double replacement
Decomposition
What type of reaction is AB + CD → AD + CB?
Single replacement
Double replacement
Decomposition
Synthesis
Which reaction shows a synthesis reaction?
2H₂ + O₂ → 2H₂O
2KClO₃ → 2KCl + 3O₂
Cu + AgNO₃ → Ag + CuNO₃
Pb(NO₃)₂ + KI → KNO₃ + PbI₂
Which reaction shows a decomposition reaction?
Ca + Cl₂ → CaCl₂
2HgO → 2Hg + O₂
Mg + HCl → MgCl₂ + H₂
NaCl + AgNO₃ → AgCl + NaNO₃
Which reaction shows a single replacement reaction?
Zn + HCl → ZnCl₂ + H₂
H₂ + O₂ → H₂O
NaOH + HCl → NaCl + H₂O
CaCO₃ → CaO + CO₂
Which of the following is a chemical change?
Burning wood
Boiling water
Breaking a rock
Melting ice
Which reaction produces a precipitate?
A solid forms in a solution.
Water boils.
Ice melts.
Gas bubbles form.
Which reaction shows gas production?
Formation of bubbles
Color change
Temperature change
A solid appears
Identify the products in: Na + Cl₂ → NaCl
Na
Cl₂
NaCl
Identify the reactants in: C + O₂ → CO₂
CO₂
C
O₂
What does the arrow (→) mean in a chemical equation?
Reacts to produce
Is equal to
Forms a mixture
Means the reaction is reversible
Identify the reaction type: CaCO₃ → CaO + CO₂
Synthesis
Decomposition
Single replacement
Double replacement
Identify the reaction type: Ca + 2HCl → CaCl₂ + H₂
Double replacement
Synthesis
Single replacement
Decomposition
Identify the reaction type: AgNO₃ + NaCl → AgCl + NaNO₃
Double replacement
Single replacement
Synthesis
Decomposition
Is the equation balanced? H₂ + Cl₂ → 2HCl
Yes
No
Is the equation balanced? N₂ + H₂ → 2NH₃
Yes
No
Is the equation balanced? 2Mg + O₂ → 2MgO
Yes
No
Is the equation balanced? Fe + O₂ → Fe₂O₃
Yes
No
Which shows a color change due to a chemical reaction?
Iron rusting
Red dye dissolving in water
Melting chocolate
Freezing water
Which represents a balanced equation?
2H₂ + O₂ → 2H₂O
H₂ + O₂ → H₂O
Fe + O₂ → Fe₂O₃
N₂ + H₂ → NH₃
Which represents an unbalanced equation? (Select all that apply)
H₂ + O₂ → H₂O
N₂ + 3H₂ → 2NH₃
Fe + O₂ → Fe₂O₃
2Mg + O₂ → 2MgO
Which best describes a precipitate?
A solid formed from a solution during a reaction.
A gas released.
A liquid evaporating.
A color change.
Identify the reaction: 2K + Br₂ → 2KBr
Synthesis
Decomposition
Single replacement
Double replacement
Identify the reaction: Cu + 2AgCl → 2Ag + CuCl₂
Double replacement
Single replacement
Synthesis
Decomposition
Identify the reaction: BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl
Double replacement
Single replacement
Synthesis
Decomposition
What happens to atoms during a chemical reaction?
Bonds between atoms are broken and made to form new substances.
The atoms disappear.
They turn into energy.
They gain mass.
Which of the following is an example of a compound?
CO₂
O₂
Ni
Ne
Which shows evidence a chemical reaction occurred? (Select all that apply)
Gas production
Temperature change
A new solid forms
Boiling water
What does a coefficient represent?
Number of molecules or formula units
Number of atoms
Charge
Subscript
Which represents a physical change?
Ice melting
Wood burning
Rust forming
Baking bread
What must remain the same on both sides of a chemical equation?
Number of each type of atom
Number of molecules
Temperature
Volume
Identify the reactants in: Mg + O₂ → MgO
Mg
O₂
MgO
Identify the products in: H₂ + Cl₂ → 2HCl
H₂
Cl₂
HCl
Balance: H₂ + O₂ → H₂O
2,1,2
1,1,2
2,2,1
1,2,2
Balance: N₂ + H₂ → NH₃
1,3,2
1,1,2
2,3,2
1,2,3
Balance: Fe + O₂ → Fe₂O₃
4,3,2
1,1,1
2,2,3
3,2,4
Balance: Mg + O₂ → MgO
2,1,2
1,1,1
1,2,1
3,1,3
Balance: Al + O₂ → Al₂O₃
4,3,2
1,1,1
2,1,1
1,2,3
