Unit 5 Review on Chemical Equations and Reactions

Unit 5 Review on Chemical Equations and Reactions

1. Chemical equations

2. Balancing Chemical Equations

3. Types of Chemical Reaction

4. Single Replacement Reaction

Multiple Choice

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled
• the product is half the mass of the reactants
• the mass is the same
• the mass changes depending on the reaction

Multiple Choice

Is this balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!
• NO!

Multiple Choice

All of the following reactions are correctly balanced except-

• A
• B
• C
• D

Multiple Choice

Which equation is a synthesis reaction?

• CH₄ + 2O₂ → CO₂ + 2H₂O
• CH₄ + ClO₂ →  CCl + H₂O
• S₂ + Li → S₂Li

Multiple Choice

Which are the product(s) of this chemical reaction?

FeCl₃ + NH₄OH -->

• FeCl₃NOH₄

• NH₄Fe + Cl₃OH

• Fe(OH)₃ + NH₄Cl

• NCl₃ + FeOH₅

Multiple Choice

A double replacement reaction takes place when aqueous Na₂CO₃ reacts with aqueous Sn(NO₃)₂. You would expect one of the products of this reaction to be _________________.

• NaNO₃

• NaSn

• Sn(CO₃)₂

• CNO₃

Multiple Choice

Predict the products of the following reaction. No need to balance.

Al + HCl -->

• AlCl + H

• AlCl₃ + H₂

• HAl + Cl

• H₃Al + Cl₂

Multiple Choice

A mixture contains aluminum metal, copper metal, and tin metal. This mixture is mixed with zinc nitrate. Which metals, if any, will react?

• Aluminum only

• Copper only

• Tin only

• All 3

Multiple Choice

Predict the product(s) of this reaction (don't worry about balancing):

Mg + HCl →

• No Reaction

• MgCl₂ + H₂

• MgCl₂ + H

• MgCl + H₂

Multiple Choice

Based on the activity series, will this reaction occur?

Au (s) + HCl (l) →

• AuCl + H

• No Reaction

• AuCl + H_2

• Au₂Cl + H₂

Multiple Choice

The numbers needed to balance the equation are:

• 2, 7, 6, 4
• 2, 3, 2, 6
• 4, 3, 1, 12
• 1, 6, 2, 6

Multiple Choice

The numbers needed to balance the equation are:

• 2, 7, 6, 4
• 2, 1, 1, 2
• 3, 1, 1, 3
• 1, 6, 2, 6

Multiple Choice

The numbers needed to balance the equation are:

• 2, 7, 6, 4
• 2, 1, 3, 2
• 1, 1, 3, 2
• 2, 3, 1, 3

Multiple Choice

Which of the following equations are correctly balanced?

• 12CO₂ +H₂O --> C₆H₁₂O₆ + O₂
• CO₂ + 9H₂O --> C₆H₁₂O₆ + O₂
• CO₂ + H₂O --> 3C₆H₁₂O₆ + O₂
• 6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

Multiple Choice

Products that are formed in complete combustion reactions.

• CO and H₂O

• CO₂ and H₂O

• H₂ and H₂O

• CO and H₂

Multiple Choice

2Pb(NO₃)₂ --> 2PbO + 4NO₂ + O₂

• Synthesis 
• Decomposition
• Single displacement
• Combustion

Multiple Choice

3KOH + H₃PO₄ --> K₃PO₄ + 3H₂O

• Combustion

• Double Displacement

• Single displacement

• Neutralization

Multiple Choice

3Ca + 2AlCl₃ --> 3CaCl₂ + 2Al

• Synthesis

• Decomposition

• Single displacement

• Double displacement

Multiple Choice

In a chemical reaction

• The atoms of the reactants always stay together to form the products
• The atoms of the reactants unbond, rearrange, and then rebond to form the products
• New atoms are formed which combine to make the products
• Some atoms disappear while others multiply to form the products

Multiple Choice

Which equation below matches the description above?

• 2Na₃PO₄ + 3CaCl₂ --> Ca₃(PO₄)₂ + 6NaCl

• Ca₃(PO₄)₂ + 6NaCl --> 2Na₃PO₄ + 3CaCl₂

• CaPO₄ + NaCl --> NaPO₄ + CaCl

• NaPO₄ + CaCl --> CaPO₄ + NaCl

Multiple Choice

Which of the following would be considered a product of this reaction?

• Potassium bromide

• Silver (I) nitrate

• Potassium nitrate

• Potassium silveride

Multiple Select

In the molecule below, which of the following choices is a coefficient? (Select all that apply)

• 3

• 2

• 4

• SO

Multiple Choice

How many sulfur atoms are present in this molecule?

• 4

• 3

• 12

• 1

Multiple Select

In the molecule below, which of the following choices is a subscript? (Select all that apply)

• 3

• 2

• 4

• SO

Multiple Choice

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

(i) Displacement reaction

(ii) Precipitation reaction

(iii) Combination reaction

(iv) Double displacement reaction

• (a) (i) only

• (b) (ii) only

• (c) (iv) only

• (d) (ii) and (iv)

Multiple Choice

Which of the following are combination reactions?

(i) 2KClO₃ + Heat --> 2KCl + 3O₂

(ii) MgO + H₂O --> Mg(OH)₂

(iii) 4Al + 3O₂ --> 2Al₂O₃

(iv) Zn + FeSO₄ --> ZnSO₄ + Fe

• (a) (i) and (iii)

• (b) (iii) and (iv)

• (c) (ii) and (iv)

• (d) (ii) and (iii)

Multiple Choice

The following reaction is used for the preparation of oxygen gas in the laboratory

2KClO₃ (s) + Heat --Catalyst--> 2KCl (s) + 3O₂ (g)

Which of the following statement(s) is(are) correct about the reaction?

• (a) It is a decomposition reaction and endothermic in nature

• (b) It is a combination reaction

• (c) It is a decomposition reaction and accompanied by release of heat

• (d) It is a photochemical decomposition reaction and exothermic in nature

Multiple Choice

Which among the following is(are) double displacement

reaction(s)?

(i) Pb + CuCl₂ --> PbCl₂ + Cu

(ii) Na₂SO₄ + BaCl₂ --> BaSO₄ + 2NaCl

(iii) C + O₂ --> CO₂

(iv) CH₄ + 2O₂ --> CO₂ + 2H₂O

• (a) (i) and (iv)

• (b) (ii) only

• (c) (i) and (ii)

• (d) (iii) and (iv)

Multiple Choice

COMPLETE WITH THE MISSING WORD:

During a chemical reaction, the ___________ within the substances reorganise and unite in different ways

• reactants

• lights

• atoms