Download Worksheet/Pretest 1 Which of the following is/are conserved in a

Worksheet/Pretest
1
Which of the following is/are conserved in a chemical reaction?
a) mass
b. atoms
c. moles
d. both mass and atoms
2
The only products if propane burns in air is/are
a. CO
b. CO2
c. CO2 and H2O
d. H2O
3.
The mole ratio of two components in a chemical reaction is determined from the
a) coefficients of each component
c) volume of each component
b) mass of each component
d) number of atoms of each component
4.
When doing a mass-mass calculation, the mass of the first component is first converted into
a. liters
b. number of atoms
c. moles
d. number of molecules
5. Which of the following is a correct interpretation of
this equation?
P 4 + 5 O2 
+ 2 P2O5
6. If 3.0 moles of Al(NO3)3 are used up in the
following balanced reaction, how many moles of
HNO3 will be produced?
a. 9.0 moles
c. 6.0 moles
a.1 gram of P4 and 5 grams O2 react to form 2 grams P2O5
b. 1 molecule of P4 and 5 molecules O2 react to form 2 molecules of P2O5
c. 1 mole P4 and 5 moles O2 react to form 2 moles of P2O5
d. both b and c are correct
2 Al(NO3)3(aq)
+
b. 33.5 g
c. 29.2 g
Mg(OH)2
a. 0.667 moles
b. 3.00 moles
c. 1.50 moles
+
Fe
2 HCl

O2

+

KClO3
MgCl2
+
2 H2O
Fe2O3
KCl
+
O2
FeCl2
+
What mass of FeCl2 could be produced from 35.0 g of Fe and HCl
if the balanced reaction is
Fe
+
2 HCl

H2
What mass of zinc could be produced from the reaction
of 6.50 g of carbon if the reaction is:
C
12.
6 HNO3(aq)
d. 6.00 moles
9. Potassium chlorate (KClO3) decomposes to form
Potassium chloride and oxygen gas. If 5.4 moles of potassium
chlorate decompose, how many moles of oxygen could be produced?
11.
+
d. 67.0 g
8. If 111.70 g of iron react with oxygen gas to produce iron
(III) oxide, how many moles of oxygen gas will be needed?
10.
Al2(SO4)3(s)
b. 3.0 moles
d. 2.0 moles
7. Given the equation to the right, calculate the mass of H2O that would
be produced if 33.5 grams of Mg(OH) 2 react.
a. 20.7 g

3 H2SO4(aq)
+
2 ZnO

2 Zn
+
CO2
What masses of nitrogen and water could be produced from
45.0 g of ammonia? When ammonia burns in pure oxygen, the reaction is:
4 NH3
+
3 O2

2 N2
+
6 H2O
1. chemical reaction
2. reactant
3. product
4. coefficients
5.
A.
B.
C.
D.
numbers used to balance chemical equations
substance that enters into a chemical reaction
process in which a new substance is formed
written on the right side of the arrow in a chemical equation
Which of the following statements is INCORRECT?
a)
b)
c)
d)
An equation is balanced by changing subscripts as needed.
Chemical equations are balanced to show that matter is conserved.
Reactants are substances written to the left of the arrow.
Coefficients indicate the relative number of molecules of each substance in a chemical reaction.
6. Which set of coefficients balance the following equation?
a) 1, 3, 1, 3
b. 1, 1, 1, 3
 Al(OH)3
d. 3, 1, 1, 1
AlCl3 + NaOH
c. 3, 1, 3, 1
+
NaCl
7. When the equation Al + O2  Al2O3 is balanced using smallest whole number coefficients, what is the coefficient for Al 2O3?
a) 1
b. 3
c. 2
d. 4
8.
The formula for chlorine gas is
a) Cl
b) Cl2 (g)
c) Cl (g)
d) 2Cl (g)
+

9.
In the chemical equation 2 H2(g)
a) 2 grams of water
b) 2 liters of water
O2(g)
10.
Which is the best description of NaCl(aq)?
a. sodium chloride molecules dissolved in water
c. sodium atoms and chloride atoms dissolved in water
.
Balance the following chemical equations:
15.
PbI2 + AgNO3  Pb(NO3)2
16.
Mg
+
17.
C3H8
18.
P4
19.
Na2CO3

TiCl4
+
+

O2

O2
+
MgCl2
CO2
+
+
+
2 H2O(l) the term to the right of the arrow means
c) 2 molecules of water
d) 2 atoms of water
b. sodium chloride crystallized from water solution
d. sodium ions and chloride ions dissolved in water
AgI
N2
21.
PbO2
22.
Ca
+
H2O
23.
Mg
+
H3PO4
H2O
24.
CaCO3
zinc chloride
+

+
Ti
H2O
P4O10
HCl

NaCl
+
CO2
+
+
I2

20.

NI3
PbO

+

O2
Ca(OH)2

+
Mg3(PO4)2
CaO
+
zinc
26.
barium chloride
27.
calcium hydroxide
28.
+
hydrochloric acid
calcium carbonate +
29.
bromine
30.
magnesium
+
+

ammonium sulfate
hydrogen (gas)
ammonium chloride
nitric acid

calcium nitrate
hydrochloric acid

calcium chloride + carbon dioxide
+

sodium iodide
+
barium sulfate
iron(III) chloride

+
sodium bromide
magnesium chloride
water
+
+
iodine
+
iron
+
CO2
Write balanced equations for the following reactions:
25.
H2
water
H2