Chemical Reactions Question Preview (ID: 39708)
8th Grade Level Test On Chemical Reactions, Photosynthesis And Respiration And Mixtures.
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The color change that occurs when iron rusts is evidence of a(n)
a) surface change
b) increase in concentration
c) temperature change
d) chemical reaction
The following reaction is considered to be what? Zn + 2HCl --- ZnCl + H
a) decomposition reaction
b) single replacement
c) double replacement
d) synthesis reaction
A reaction that combines simpler reactants to form a new compound is called a
a) combustion reaction
b) decomposistion reaction
c) concentration reaction
d) synthesis reaction
Which statement reflects the law of conservation of mass?
a) mass can be created but not destroyed
b) mass can be destroyed but not created
c) mass cannot be created nor destroyed
d) mass can be created and destroyed
In the chemical equation 2H2 + O2 -- 2H2O, what is 2H2 considered?
a) reactant
b) product
c) indicates the combustion reaction
d) indicates the direction of reaction
In the equation N2 + 3H2 -- 2NH3, the coefficient of the hydrogen reactant is
a) 1
b) 2
c) 3
d) 6
Most living things obtain energy through a process that is very similar to a combustion reaction. This process is called
a) catalytic conversion
b) silicon purification
c) respiration
d) photosynthesis
The breakdown of water molecules (H2O) into hydrogen (H2) and oxygen (O2) molecules is an example of a
a) synthesis reaction
b) combustion reaction
c) decomposition reaction
d) physical change
To balance a chemical equation, you can change
a) compounds
b) subscripts
c) coefficients
d) elements
In the chemical equation 2H2 + O2 -- 2H2O, the arrow indicates
a) the speed of the reaction
b) the direction of the reaction
c) the side of the reaction with more mass
d) that a physical change has occurred
Which of the following best describes an endothermic reaction?
a) absorbs energy and decreases temperature
b) releases energy and decreases tempature
c) absorbs energy and increases temperature
d) releases energy and increases temperature
Which of the following best describes an exothermic reaction?
a) absorbs energy and decreases temperature
b) releasess energy and decreases temperature
c) absorbs energy and increaes temperature
d) releases energy and increases temperature
A mixture where you can see the different parts is called
a) homogenous
b) heterogenous
c) solution
d) colloid
A mixture where you cannot see the parts is called
a) homogenous
b) hetergenous
c) solution
d) colloid
C6H12O6 + 6O2 ---- 6CO2 + 6H2O + ATP is which equation
a) respiration
b) photosynthesis
c)
d)
6CO2 + 6H2O +energy----- C6H12O6 + 6O2 is which equation
a) photosynthesis
b) respiration
c)
d)
Is this equation balanced? CF4 + 2Br2 ---- CBr4 + 2F2
a) balanced
b) unbalanced
c)
d)
Is this equation balanced? N2 + H2 ---- NH3
a) unbalanced
b) balanced
c)
d)
Which of the following DOES NOT affect the rate of a chemical change
a) surface area
b) concentration
c) catalysts
d) type of element
Baking bread is a ___________ change
a) chemical
b) physical
c)
d)
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