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WorksheetsUnit 6 Chemical Reactions Review
Total questions: 20
Worksheet time: 12mins
The chemical formula H2O written over the arrow represents what in the following equation?
Heat has been added.
A catalyst has been added.
A product is formed.
An impurity.
In the following equation, Na+ is a
reactant
product
catalyst
state of matter
Predict what happens when iron (Fe) is added to a solution of potassium chloride (KCl).
No reaction occurs.
Iron (II) chloride is formed.
Iron potassium chloride is formed.
Iron potassium is formed.
Which answer choice summarizes endothermic and exothermic reactions.
Exothermic reactions absorb energy and endothermic reactions release energy.
Heat is the only product formed in an exothermic reaction.
Endothermic reactions absorb energy and exothermic reactions release energy.
Both endothermic and exothermic reactions conserve energy.
Which reaction results in the cations of two ionic compounds exchanging places to form two new ionic compounds?
Synthesis
Decomposition
Single Replacement
Double Replacement
How do we represent elemental nitrogen in a chemical reaction?
Nitrogen
N
2N
N2
The following symbol over an arrow in a chemical equation represents what?
A catalyst is added to the reaction.
Heat is added to the reaction.
Yields
A precipitate is formed.
The law of conservation of mass states what?
Reactants are greater than products.
Products are greater than reactants.
Reactants can be more or less than the total mass of products.
Reactants are always equal to the total mass of products.
These 3 equations represent what type of chemical reaction?
Synthesis
Decomposition
Single Replacement
Combustion
How many total atoms of aluminum and oxygen are in one formula unit of Al2(C2O4)3
2 Al 4 O
2 Al 12 O
6 Al 12 O
2 Al 7O
The activity series is used....
To predict if a combustion reaction will occur.
To predict if a double replacement reaction will occur.
To predict if a single replacement reaction will occur.
To predict the melting points of elements.
Fill in the following blanks....
An endothermic reaction _____________ heat from the surroundings, and feels _______________ to the touch.
releases, hot
absorbs, cold
absorbs, hot
releases, cold
When will a double replacement reaction not occur?
When all the products are insoluble (s)
When all of the products are soluble (aq)
When one of the products is soluble (aq) and the other insoluble (s)
All double replacement reactions occur.
A heating pad is used to soothe a sore back. When applied to the back, which way foes heat move?
Heat moves from the back to the heating pad because the pad is warmer.
Heat moves from the heating pad to the back because the pad is warmer than the back.
Heat doesn't move.
Heat moves from the back to the heating pad because the back is colder.
Classify the following reaction.
Exothermic / decomposition
Exothermic / synthesis
Endothermic / decomposition
Endothermic / synthesis
If the temperature of the system increases for the following reaction below..
CH3OH (g) + 101 kJ CO (g) + 2H2 (g)
equilibrium shifts to the right, and the concentration of CH3OH increases and the concentration of CO increases
equilibrium shifts to the right, and the concentration of CH3OH decreases and the concentration of CO increases
there is no shift in equilibrium and the concentrations in the system do not change
equilibrium shifts to the left, and the concentration of CH3OH increases and the concentration of CO decreases
If the concentration of CO increases for the following reaction below
CH3OH (g) + 101 kJ CO (g) + 2H2 (g)
the equilibrium shifts to the left and the concentration of CH3OH increases
the equilibrium shifts to the left and the concentration of CH3OH decreases
the equilibrium shifts to the right and the concentration of CH3OH increases
the concentrations in the system do not change
Predict the products for the reaction between sodium cyanide (NaCN) and sulfuric acid (H2SO4).
Na2SO4 and HCN
NaSO and HCN
NaH and CNSO4
one of the above
Chlorine gas and solid iron (III) bromide react to yield solid iron (III) chloride and bromine gas. What is the balanced chemical equation for this reaction?
3Cl (g) + FeBr3 (s) -> FeCl3 (s) + 3Br (g)
Cl (g) + Fe3Br (s) -> Fe3Cl (s) + Br (g)
3Cl2 (g) + 2FeBr3 (s) -> 2FeCl3 (s) + 3Br2 (g)
Cl2 (g) + 2Fe3Br (s) -> 2Fe3Cl (s) + Br2 (g)
An aqueous solution of aluminum sulfate, Al2(SO4)3 reacts with solid strontium hydroxide, Sr(OH)2. Predict the products and determine the solubility of each product.
Al(OH)3 (s) + SrSO4 (s)
Al(OH)3 (s) + SrSO4 (aq)
AlOH3 (s) + Sr(SO4)2 (aq)
AlOH3 (s) + SrSO4 (s)
