Types Of Chemical Reactions Question Preview (ID: 39404)
Chemical Reaction Types.
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In chemical reactions, the number of atoms in the product is __________.
a) the same as the number of atoms in the reactants
b) greater than the number of atoms in the reactants
c) less than the number of atoms in the reactants
d) the same as the number of molecules in the reactants
The mass of the reactants in a chemical reaction is 4.00 kg. After the reaction takes place completely, there will be __________.
a) 4.00 kg of products
b) 4.00 kg of reactants
c) 2.00 kg of products
d) 2.00 kg of products
Meals, Ready to Eat are an instant hot meal developed by the U.S. military for troops. The meal heats up when water is added to the magnesium metal tray because the chemical reaction between water and magnesium is an _________.
a) exothermic reaction
b) endothermic reaction
c) evaporating
d) energy conserving action
When substances are mixed, changes in heat energy provide evidence to show if a chemical reaction or a physical change has occurred. In chemical reactions, heat energy is often
a) released or absorbed
b) destroyed
c) created
d) created and destroyed
An iceberg melting in an ocean is an example of an endothermic process because:
a) The iceberg absorbs thermal energy from the surrounding water.
b) A chemical reaction occurs between the iceberg and the ocean.
c) The iceberg releases thermal energy from the surrounding water.
d) It affects nearby wildlife.
What type of reaction is the following: CH4 + 2O2 = CO2 + 2H2O
a) combustion
b) single displacement
c) double displacement
d) synthesis
What type of reaction is the following: 2NH3 = N2 + 3H2
a) decompostion
b) combustion
c) single replacment
d) redox
What type of reaction is the following: 2NaCl + H2SO4 = Na2SO4 + 2HCl
a) double replacement
b) single replacement
c) combustion
d) synthesis
In a combustion reaction, ____ is required in order for the reaction to take place
a) oxygen
b) water
c) carbon dioxide
d) nitrogen
In what kind of reaction does one element replace a similar element in a compound?
a) single replacement
b) double replacement
c) combustion
d) synthesis
According to the law of conservation of mass, the total mass of the reacting substances is
a) always equal to the total mass of the products.
b) always more than the total mass of the products.
c) always less than the total mass of the products.
d) sometimes more and sometimes less than the total mass of the products.
What type of reaction is the following: Fe + S = FeS
a) synthesis
b) double displacement
c) single displacement
d) combustion
Which statement correctly describes how the following chemical equation violates the law of conservation of mass? H2 + O2 → 2HO2
a) There are more hydrogen atoms on the right side of the arrow then on the left side.
b) There are more hydrogen atoms on the left side of the arrow then on the right side.
c) There are the same number of hydrogen atoms on the left side of the arrow as there are on the right side.
d) There are more oxygen atoms on the right side of the arrow then on the left side.
The reaction A + BC ---- B + AC is a _____ reaction
a) single replacement
b) double replacement
c) combustion
d) synthesis
Starting substances in a reaction are known as:
a) reactants
b) products
c) doo-hickeys
d) thingies
The symbol (aq) means:
a) liquid
b) solid
c) gas
d) enzyme
When two aqueous solutions mix and two things trade places with each other, a ______ reaction has occurred
a) double replacement
b) single replacement
c) synthesis
d) decomposition
AB ---- A + B is a ______ reaction
a) decomposition
b) synthesis
c) double replacement
d) single replacement
A reaction that has oxygen as a reactant and usually has carbon dioxide and water as products is a _____ reaction.
a) combustion
b) synthesis
c) single replacement
d) double replacement
A + B ------ AB is what type of reaction?
a) decompostion
b) single replacement
c) double replacement
d) synthesis
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