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Period:_________
Math of Chemistry
1) Which equation shows conservation of atoms?
1)
2)
3)
4)
H2 + O 2
H2O
H2 + O 2
2H2O
2H2 + O2
2H2O
2H2 + 2O2
2H2O
2) Given the incomplete equation representing a
reaction:
2C6H14 + ______ O2 ® 12CO 2 + 14H2O
What is the coefficient of O 2 when the equation
is completely balanced using the smallest
whole-number coefficients?
1) 13
2) 14
3) 19
4) 26
3) Given the balanced equation with an unknown
compound represented by X:
Which compound is represented by X?
1)
2)
3)
4)
CH 3OH(aq)
CH 2(OH)4(aq)
CH 3CH 2OH(aq)
CH 2OHCH 2OH(aq)
7) Given the unbalanced equation:
When the equation is correctly balanced using
the smallest whole-number coefficients, what is
the coefficient of CO?
1) 1
2) 2
3) 3
4) 4
8) If an equation is balanced properly, both sides
of the equation must have the same number of
1)
2)
3)
4)
atoms
coefficients
molecules
moles of molecules
9) Which equation is correctly balanced?
1) CaO + 2H2O ® Ca(OH) 2
2) NH 3 + 2O2 ® HNO3 + H2O
3) Ca(OH) 2 + 2H3PO 4 ® Ca3(PO4) 2 + 3H
2O
4) Cu + H 2SO 4 ® CuSO 4 + H2O + SO 2
10) When the equation
4) Which chemical equation is correctly balanced?
1)
2)
3)
4)
H2(g) + O 2(g) ® H2O(g)
N2(g) + H 2(g) ® NH 3(g)
2NaCl(s) ® Na(s) + Cl2(g)
2KCl(s) ® 2K(s) + Cl2(g)
5) Given the incomplete equation for the
combustion of ethane:
is correctly balanced using smallest whole
numbers, the sum of the coefficients will be
1) 9
3) H2O
4) H2O2
6) One mole of which substance contains a total
of
atoms?
1) Li
2) NH 3 3) O2
4) CO 2
3) 3
4) 12
11) Given the word equation:
sodium chlorate ® sodium chloride +
oxygen
2C2H6+ 7O2
4CO 2 + 6 ___
What is the formula of the missing product?
1) CH 3OH
2) HCOOH
2) 7
Which type of chemical reaction is
represented by this equation?
1)
2)
3)
4)
double replacement
single replacement
decomposition
synthesis
12)When the equation
is correctly balanced using the smallest whole number coefficients, the sum of the coefficients
is
1) 9
2) 8
3) 5
4) 4
13) Given the unbalanced equation:
What is the sum of the coefficients when the equation is completely balanced using the
smallest whole number coefficients?
1) 5
2) 7
3) 9
14) Given the balanced equation representing a
reaction:
4) 11
17)
N2(g) + 3 H2(g) « 2 NH3(g)
What type of reaction is shown above?
Which type of reaction is represented by this
equation?
1)
2)
3)
4)
decomposition
double replacement
single replacement
synthesis
15) In which type of reaction do two or more
substances combine to produce a single
substance?
1)
2)
3)
4)
synthesis
decomposition
single replacement
double replacement
16) Which equation represents a double
replacement reaction?
1)
2)
3)
4)
2 Na + 2 H 2O ® 2 NaOH + H 2
CaCO 3 ® CaO + CO 2
LiOH + HCl ® LiCl + H2O
CH 4 + 2 O2 ® CO 2 + 2 H2O
1)
2)
3)
4)
synthesis
decomposition
single replacement
double replacement
18) Which gas sample contains a total of 3.0 × 10
23 molecules?
1) 71 g of Cl 2
2) 2.0 g of H2
3) 14 g of N2
4) 38 g of F 2
19) Which sample contains the same number of
atoms as 24 grams of carbon?
1) 80. g Ar
2) 24 g Mg
3) 10. g Ne
4) 4.0 g He
20) What is the gram formula mass of (NH 4) 2SO 4
?
1) 66.0 g
2) 94.0 g
3) 114 g
4) 132 g