All GRE Subject Test: Chemistry Resources
Example Questions
Example Question #11 : Reaction Chemistry
What happens when a solution of is added to a solution of
?
A synthesis reaction
A decomposition reaction
A combustion reaction
A combination reaction
A double displacement reaction
A double displacement reaction
The chemical reaction that would occur is provided below:
This type of reaction is called a double displacement reaction in which there is an exchange of ions between two compounds. This type of reaction usually results in the formation of a precipitate or gas. In terms of the positive ions, the switch places
to form two new products.
Example Question #12 : Reaction Chemistry
Which of the following types of reactions best describes the following reaction:
Combustion
Synthesis
Alkylation
Catalytic
Combustion
The type of reaction given is termed a combustion reaction. A combustion reaction is one that involves a substance reacting with molecular oxygen. For combustion reactions involving a hydrocarbon as given in the example, the major products are carbon dioxide and water. The word combustion is a synonym for burn.
Example Question #12 : Reaction Chemistry
For the reaction given, identify the type of reaction taking place.
Displacement reaction
Decomposition reaction
Combination reaction
Synthesis reaction
Displacement reaction
A displacement reaction is one in which an atom, ion or molecule moves from one compound to another to replace an atom, ion or molecule in another compound. In the reaction given, ion moves from
to
to form
.
Example Question #154 : Gre Subject Test: Chemistry
Determine the percentage yield of the reaction given if 12.6 grams of is reacted excess
to give 10.4 grams of
.
In chemistry, percentage yield is a term used to quantify the efficiency of a chemical reaction. In order to calculate this quantity, the value for the actual yield and theoretical yield is needed. The actual yield is the amount of product obtained during a chemical reaction. The theoretical yield is the maximum amount of product possible to be obtain by a chemical reaction which is based on the amount of reactants used. Below is the formula needed to calculate the percentage yield.
Convert the number of grams of to moles:
Based on the chemical equation 1 mole of is produced for every 1 mole of
reacted.
Convert the moles of to grams:
Example Question #4 : Reactions With Inorganic Compounds
Determine the percentage yield of the reaction given if 21.0 grams of is reacted with excess
to give 10.2 grams of
.
In chemistry, percentage yield is a term used to quantify the efficiency of a chemical reaction. In order to calculate this quantity, the value for the actual yield and theoretical yield is needed. The actual yield is the amount of product obtained during a chemical reaction. The theoretical yield is the maximum amount of product possible to be obtain by a chemical reaction which is based on the amount of reactants used. Below is the formula needed to calculate the percentage yield.
Convert the number of grams of to moles:
Based on the chemical equation 1 mole of is produced for every 1 mole of
reacted.
Convert the moles of to grams:
Example Question #151 : Gre Subject Test: Chemistry
Determine the theoretical yield in grams of produced if 5.6 grams of
is reacted with excess
.
Convert the number of grams of to moles:
Based on the chemical equation 1 mole of is produced for every 2 mole of
reacted.
Therefore:
Convert the moles of to grams:
Example Question #155 : Gre Subject Test: Chemistry
For the reaction given, identify the type of reaction taking place.
Double displacement reaction
Combination reaction
Synthesis reaction
Decomposition reaction
Double displacement reaction
A displacement reaction is one in which an atom, ion or molecule moves from one compound to another to replace an atom, ion or molecule in another compound. In the reaction given, ion moves from
to
. Also,
ion moves from
to
.
Example Question #2 : Reactions With Inorganic Compounds
Determine the percentage yield of the reaction given if 40.0 grams of is heated to give 15.0 grams of
.
In chemistry, percentage yield is a term used to quantify the efficiency of a chemical reaction. In order to calculate this quantity, the value for the actual yield and theoretical yield is needed. The actual yield is the amount of product obtained during a chemical reaction. The theoretical yield is the maximum amount of product possible to be obtain by a chemical reaction which is based on the amount of reactants used. Below is the formula needed to calculate the percentage yield.
Convert the number of grams of to moles:
Based on the chemical equation 1 mole of is produced for every 1 mole of
reacted.
Convert the moles of to grams:
Example Question #1 : Reactions With Inorganic Compounds
For the reaction given, identify the type of reaction taking place.
Combination reaction
Decomposition reaction
Synthesis reaction
Displacement reaction
Displacement reaction
A displacement reaction is one in which an atom, ion or molecule moves from one compound to another to replace an atom, ion or molecule in another compound. In the reaction given, 2 ions move from 2 moles of
to
to form
.
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All GRE Subject Test: Chemistry Resources
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