2Q G10 Chemical Reactions

Multiple Choice

The reactants are on the left side of the chemical equation.

• True
• False

Multiple Choice

What is the left part of a chemical equation called?
H_{2 +} O → H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Multiple Choice

A reaction that releases energy in the form of heat is known as . . .

• a synthesis reaction

• an exothermic reaction

• a decomposition reaction

• an endothermic reaction

Multiple Choice

A reaction that absorbs energy in the form of heat is known as . . .

• a synthesis reaction

• an exothermic reaction

• a decomposition reaction

• an endothermic reaction

Multiple Choice

the process by which one or more substances change to produce one or more different substances, defines ___________

• conservation of mass

• a chemical reaction

• a chemical formula

• a catalyst

Multiple Choice

substance that increases reaction rate by lowering the activation energy of a reaction

• catalyst

• molecule

• endothermic

• synthesis reaction

Multiple Choice

One of the signs of a chemical reaction taking place is:

• Bubbles are produced 
• Reactants are not combining
• Products are not forming
• Color is not changing

Multiple Choice

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.
• Matter can only be lost in a chemical reaction.
• Matter can only be gained in a chemical reaction.
• Matter can be gained and lost in a chemical reaction. 

Multiple Choice

A group of chemical symbols and numbers to show number of atoms of each element in a molecule

• reactant

• Chemical Formula

• product

Multiple Choice

When I want to balance a chemical equation, this is the only number that I can change.

• Subscript

• Coefficient

• Elemental Symbol

• Yields

Multiple Choice

The subscript tells you how many of what there are in a chemical reaction?

• atoms of that element

• molecules of that compound

• number of reactions

• They don't tell you anything.

Multiple Choice

Is this equation balanced?

• yes
• no
• Not enough information

Multiple Choice

Is this equation balanced?

• Yes

• No

Multiple Choice

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

• A

• B

• C

• D

Multiple Choice

Choose the answer that shows this equation balanced:

C + S₈ ----->CS₂

• 4C + S₈ ----->4CS₂

• 3C + S₈ -----> 2CS₂

• C + 2S₈ -----> 6CS₂

• 8C + S₈ -----> 4CS₂

Multiple Choice

What are the coefficient used to balance the equation below?
__Ag₂O →__ Ag +___O₂

• 2,4,1
• 1,1,1
• 2,1,2
• 2,2,2

Multiple Choice

Which type of chemical reaction has two or more reactants to make one product?

• combustion

• single displacement

• double displacement

• synthesis

• decomposition

Multiple Choice

What reaction has the following general formula:

A + B --> AB

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

Multiple Choice

What is a synthesis reaction?

• A synthesis reaction is a chemical reaction where two or more substances combine to form a single product.

• A synthesis reaction is a process where substances are mixed without any chemical change.

• A synthesis reaction involves the exchange of ions between two compounds.

• A synthesis reaction is when a single substance breaks down into two or more products.

Multiple Choice

Which of the following is an example of a synthesis reaction?

• $$2H_2 + O_2 \rightarrow 2H_2O$$

• $$H_2O \rightarrow H_2 + O_2$$

• $$NaCl \rightarrow Na + Cl$$

• $$C_6H_{12}O_6 \rightarrow 6CO_2 + 6H_2O$$

Multiple Choice

Which of the following reactions is a synthesis reaction?

• $$N_2 + 3H_2 \rightarrow 2NH_3$$

• $$2KClO_3 \rightarrow 2KCl + 3O_2$$

• $$Zn + 2HCl \rightarrow ZnCl_2 + H_2$$

• $$C_2H_4 + 3O_2 \rightarrow 2CO_2 + 2H_2O$$

Multiple Choice

What type of reaction is this?

Al(OH)₃ → Al₂O₃ + H₂O

• Combination

• Decomposition

• Single Replacement

• Double Replacement

Multiple Choice

A decomposition reaction can be recognized because it has...

• only one product

• only one reactant

• 2 or more reactants and 2 or more products

• the presence of a catalyst

Multiple Choice

A decomposition reaction can be represented as _____________________.

• AB  → A + B
• A + B → AB
• AB + CD → AC + BD
• A + BC → B + AC

Multiple Choice

Determine the type of reaction.

Pb(NO₃)₂ --> PbO + NO₂ + O₂

• Synthesis

• Decomposition
• Neither

• Both

Multiple Choice

Which of the following correctly describes a single replacement reaction?

• two elements combine to form a compound

• oxygen is necessary for the reaction to occur

• elements from two compounds replace each other

• one element replaces another element in a compound

Multiple Choice

Which of the following elements can be replaced by copper?

• Zinc

• Hydrogen

• Silver

• Bromine

Multiple Choice

Which of the following would be the correct formulas for the products of the following reaction:

Mg + H₂O →

• H₂ + MgO

• H₂ + Mg₂O₂

• H₂ + Mg(OH)₂

• no reaction would occur

Multiple Choice

What do we look at to determine if an element is strong enough to replace another element in a single replacement reaction?

• Solubility Rules 
• Ionic Charges
• It must be insoluble!
• Activity Series

Multiple Choice

When using the activity series the more reactive metals are on top

• True

• False

Multiple Choice

Which of the following describes a double replacement reaction?

• two or more reactants form one product

• one reactant forms two or more products

• one element and one compound form a different element and a different compound

• two compounds form two different compounds

Multiple Choice

What is a precipitate?

• A solid formed from single replacement reaction

• An aqueous compound formed from double replacement reaction

• An aqueous compound formed from double replacement reaction

• A solid formed from double replacement reaction

Multiple Choice

What is the generic equation for a double replacement reaction?

• AB + CD -> AD + CB

• AB + CD -> DA + CB

• AB + CD -> A + BC

• AB + CD -> D +CBA

Multiple Choice

What are the two PRODUCTS in a complete combustion reaction?

• Carbon Dioxide and Water

• Carbon Monoxide and Methane

• Carbon and Water

• Fuel and Oxygen

Multiple Choice

A compound that contains only carbon and hydrogen and that produces carbon dioxide and water when burned is called a(n)

• binary compound
• carbonate
• ionic compound
• hydrocarbon

Multiple Choice

Complete combustion is when there is plenty of oxygen to react with. 

• True
• False

Multiple Choice

Which type of reaction is combustion?

• endothermic

• reduction

• oxidation

• displacement

Multiple Choice

Is combustion a reversible reaction?

• Yes.

• No.

Multiple Choice

What type of reaction is this?
2 C₆H₁₄ + 19 O₂ --> 12 CO₂ + 14 H₂O

• Single Replacement

• Double Replacement

• Combustion

• Decomposition

Multiple Choice

Which of the following is a characteristic of a combustion reaction?

• A) It requires a fuel and an oxidizing agent.

• B) It always produces carbon monoxide.

• C) It occurs only in the presence of water.

• D) It is an endothermic process.

Multiple Choice

3Ca + 2AlCl₃ --> 3CaCl₂ + 2Al

• Synthesis
• Decomposition
• Single diplacement
• Double displacement

Multiple Choice

4Si + S₈ --> 2Si₂S₄

• Synthesis
• Decomposition
• Single displacement
• Double displacement

Multiple Choice

3KOH + H₃PO₄ --> K₃PO₄ + 3H₂O

• Synthesis 
• Decomposition
• Single displacement
• Double displacement

Multiple Choice

3Mg + N₂ --> Mg₃N₂

• Synthesis 
• Decomposition
• Single displacement
• Combustion

Multiple Choice

C₄H₁₂ + O₂ --> CO₂ + H₂O

• Synthesis
• Combustion
• Single Replacement
• Double Replacement

Multiple Choice

Which of the following is the general formula for a decomposition reaction?

• A + B  → AB
• AB → A + B
• AB + C → AC + B
• AB + CD → AC + BD

Multiple Choice

Which reaction type is the following: C₅H₁₀O₄ + O₂ --> CO₂ + H₂O

• Decomposition
• Single Replacement
• Combustion
• Double Replacement

Multiple Choice

When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced

• charge
• subscript
• random number
• coefficient

Multiple Choice

Balance this equation:
 __Li + __Cl₂ -> __LiCl

• 2Li + Cl₂ -> 4LiCl₂
• 2Li + Cl₂ -> LiCl₂
• 2Li +  Cl₂ -> 2LiCl