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Chemical Reactions
Test Description: 8th grade level test on chemical reactions, photosynthesis and respiration and mixtures
Instructions: Answer all questions to get your test result.
1) The color change that occurs when iron rusts is evidence of a(n)
A
temperature change
B
chemical reaction
C
surface change
D
increase in concentration
2) The following reaction is considered to be what? Zn + 2HCl --- ZnCl + H
A
synthesis reaction
B
single replacement
C
double replacement
D
decomposition reaction
3) A reaction that combines simpler reactants to form a new compound is called a
A
synthesis reaction
B
concentration reaction
C
combustion reaction
D
decomposistion reaction
4) Which statement reflects the law of conservation of mass?
A
mass can be created and destroyed
B
mass can be created but not destroyed
C
mass cannot be created nor destroyed
D
mass can be destroyed but not created
5) In the chemical equation 2H2 + O2 -- 2H2O, what is 2H2 considered?
A
indicates the combustion reaction
B
product
C
indicates the direction of reaction
D
reactant
6) In the equation N2 + 3H2 -- 2NH3, the coefficient of the hydrogen reactant is
A
3
B
2
C
6
D
1
7) Most living things obtain energy through a process that is very similar to a combustion reaction. This process is called
A
photosynthesis
B
catalytic conversion
C
silicon purification
D
respiration
8) The breakdown of water molecules (H2O) into hydrogen (H2) and oxygen (O2) molecules is an example of a
A
decomposition reaction
B
physical change
C
synthesis reaction
D
combustion reaction
9) To balance a chemical equation, you can change
A
elements
B
compounds
C
coefficients
D
subscripts
10) In the chemical equation 2H2 + O2 -- 2H2O, the arrow indicates
A
the side of the reaction with more mass
B
the direction of the reaction
C
the speed of the reaction
D
that a physical change has occurred
11) Which of the following best describes an endothermic reaction?
A
releases energy and increases temperature
B
releases energy and decreases tempature
C
absorbs energy and decreases temperature
D
absorbs energy and increases temperature
12) Which of the following best describes an exothermic reaction?
A
releasess energy and decreases temperature
B
releases energy and increases temperature
C
absorbs energy and decreases temperature
D
absorbs energy and increaes temperature
13) A mixture where you can see the different parts is called
A
solution
B
heterogenous
C
colloid
D
homogenous
14) A mixture where you cannot see the parts is called
A
homogenous
B
solution
C
colloid
D
hetergenous
15) C6H12O6 + 6O2 ---- 6CO2 + 6H2O + ATP is which equation
A
photosynthesis
B
respiration
16) 6CO2 + 6H2O +energy----- C6H12O6 + 6O2 is which equation
A
photosynthesis
B
respiration
17) Is this equation balanced? CF4 + 2Br2 ---- CBr4 + 2F2
A
unbalanced
B
balanced
18) Is this equation balanced? N2 + H2 ---- NH3
A
unbalanced
B
balanced
19) Which of the following DOES NOT affect the rate of a chemical change
A
catalysts
B
concentration
C
surface area
D
type of element
20) Baking bread is a ___________ change
A
chemical
B
physical
*select an answer for all questions
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