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