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Chemical Equation Review
Test Description: Use this to review for test
Instructions: Answer all questions to get your test result.
1) What kind of chemical reaction has the same number of atoms of each element on both sides of the equation?
A
balanced
B
simple
C
unbalanced
D
complex
2) How do you know if an equation is balanced?
A
Same formulas on both sides of the equation
B
Science
C
Same number of each type of atom on each side of the equation
D
Same types of elements on both sides of equation
3) In what type of chemical reaction does one element replace another element?
A
double displacement
B
single displacement
C
decomposition
D
synthesis
4) Which would be an example of decomposition?
A
element + element --) compound
B
compound + element --) compound + element
C
compound + compound --) compound + compound
D
compound --) element + element
5) What type of reaction occurs when one substance breaks down into two or more simpler substances?
A
endothermic
B
synthesis
C
decompostion
D
displacement
6) What type of chemical reaction gives off heat?
A
endothermic
B
flammable
C
nonflammabe
D
exothermic
7) The numbers that precede symbols and formulas in a chemical equation are called
A
coeffecients
B
subscripts
C
catalysts
D
superscripts
8) What does the law of conservation of mass tell us about the mass products compared to the mass of the reactants?
A
the masses are equal
B
the mass of the reactants is greater
C
the mass of the products is greater
D
there is no relationship
9) What type of chemical reaction occurs when two substances combine to form another substance?
A
double displacement
B
synthesis
C
decomposition
D
single displacement
10) If you have 16 oxygen atoms on the reactant side how many oxygen atoms will be present on the product side?
A
2
B
16
C
8
D
4
11) How many atoms are present in 2NaC2H3O2?
A
8
B
20
C
16
D
12
12) When you balance a chemical equation what are NOT allowed to change?
A
superscripts
B
subscripts
C
formulas
D
coeffients
13) Where is the coefficient written in a chemical formula?
A
at the end of the unit or formula
B
in the middle of the formula
C
in front of the unit or formula
D
below the formula
14) How many oxygen atoms are present in Mg3(PO4)2
A
24
B
4
C
8
D
12
15) What coefficients are needed to balance: ____NaCl ---) _____Na + ___Cl2
A
1,1,1
B
1,1,2
C
2,2,2
D
2,2,1
*select an answer for all questions
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