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Yr10 precipitation reactions

Total questions: 57

Worksheet time: 3hrs 39mins

Name
Class
Date
1.

What is the net ionic equation for the precipitation reaction between BaCl2 and Na2SO4?

a)

BaCl2(aq) + Na2SO4(aq) --> BaSO4(s) + 2NaCl(aq)

b)

Na+(aq) + Cl-(aq) --> NaCl(s)

c)

Ba2+(aq) + SO42-(aq) --> BaSO4(s)

d)

Ba2+(aq) + 2Cl-(aq) + 2 Na+(aq) + SO42-(aq) --> BaSO4(s) + 2Cl-(aq) + 2Na+(aq)

2.

When solutions of two ionic compounds are combined and a solid forms, the process is called

a)

hydration

b)

solvation

c)

dissociation

d)

precipitation

3.

Which of the following pairs of solutions produces a precipitate when combined?

a)

Cu(NO3)2 and NaCl

b)

Fe(NO3)3 and MgCl2

c)

Cu(NO3)2 and K2CO3

d)

CaCl2 and NaNO3

4.

Precipitation is an example of what type of reaction?

a)

single replacement

b)

double replacement

c)

decomposition

d)

composition

5.

When solutions of MgCO3 and Fe2(SO4)3 are combined, what precipitate(s) forms?

a)

MgSO4

b)

neither form a precipitate

c)

MgSO4 and Fe2(CO3)3

d)

Fe2(CO3)3

6.

Identify the spectator ion(s) in the equation: 2Ag+(aq) + 2NO3–(aq) + 2Na+(aq) + S2–(aq) --> Ag2S(s) + 2Na+(aq) + 2NO3–(aq)

a)

2Ag+(aq) + 2NO3–(aq)

b)

2Na+(aq) + 2NO3–

c)

2Na+(aq) + S2–(aq)

d)

Ag2S(s) + 2Na+(aq

7.

An aqueous solution is:

a)

any liquid with another compound dissolved in it.

b)

an ionic compound with water dissolved in it.

c)

water with another compound dissolved in it.

d)

none of the above

8.

Which of the following compounds is SOLUBLE?

a)

copper carbonate

b)

calcium carbonate

c)

potassium carbonate

d)

strontium carbonate

9.

When solid NaCl is stirred into water, which of the following is NOT true?

a)

Individual sodium and chloride ions are present.

b)

The solution will conduct electricity.

c)

The solution will taste salty.

d)

The NaCl will fail to dissociate.

10.

In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products?

a)

(s)

b)

(g)

c)

(l)

d)

(w)

11.

What would be the formula of the precipitate that forms when Pb(NO3)2 (aq) and K2SO4 (aq) are mixed?

a)

K(NO3)2

b)

PbSO4

c)

PbK2

d)

H2O

12.

Considering the following precipitation reaction:

Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)

Which compound would not form ions in the complete ionic equation?

a)

PbI2

b)

KNO3

c)

Pb(NO3)2

d)

KI

13.

Considering the following precipitation reaction:


Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)


Which ion would NOT be present in the complete ionic equation?

a)

Pb2+

b)

K+

c)

NO3-

d)

I-

e)

All the above ions are in the complete ionic equation.

14.

Which of the following statements about writing molecular, complete and net ionic equations is FALSE?

a)

A molecular equation is a chemical equation showing the complete, neutral formulas for every compound in a reaction

b)

A complete ionic equation is a chemical equation showing all of the species as they are actually present in solution.

c)

A net ionic equation is an equation showing only the species that actually participate in the reaction.

d)

A spectator ion remains unchanged in the reaction and appears on both sides of the equation.

e)

All of the statements are true

15.

Which of the following compounds is INSOLUBLE?

a)

magnesium phosphate

b)

magnesium sulfate

c)

magnesium iodide

d)

magnesium nitrate

e)

none of the above

16.

Considering the following precipitation reaction:

Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)

What is the correct complete ionic equation?

a)

Pb2+ + (NO3)2- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3-

b)

Pb2+ + 2NO3- +2K+ + I- → PbI2(s) + 2K+ + NO3-

c)

Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3-

d)

Pb2+ + 2NO3- + 2K+ + 2I- → Pb2+ + 2I- + 2K+ + 2NO3-

17.
The rate of a chemical reaction is NOT affected by which of the following:
a)
temperature
b)
concentration
c)
particle size (surface area)
d)
All of these affect reaction rates
18.
The rate of a reaction increases as temperature__________________.
a)
Decreases
b)
Increases
c)
Stays the Same
19.
Products will form faster if____________
a)
the particle size of the reactants are larger.
b)
temperature is decreased.
c)
concentration of the reactants are increased.
d)
the reaction is not stirred.
20.
A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 
a)
catalyst
b)
product
c)
reactant
d)
solute
21.
Catalysts permit reactions to proceed along a ___________energy path.
a)
lower
b)
higher
22.
Smaller particle size allows for a _________ surface area to be exposed for the reaction.
a)
larger
b)
smaller
23.
The ___________ the surface area of the reactants, the faster the reaction rate.
a)
larger 
b)
smaller
24.
Increasing the temperature will increase the kinetic energy of particles, therefore increasing the collisions between particles.
a)
false
b)
true
25.
Usually lowering the temperature will slow down a reaction.
a)
false
b)
true
26.
Increasing the concentration of the reactants will slow down the reaction.
a)
false 
b)
true
27.
Exothermic reactions release heat to the surroundings.
a)
true
b)
false
28.
A catalyst increases the efficiency of collisions between reactants.
a)
true
b)
false
29.
You observe bubbles after adding metal to a solution. Do you assume a chemical reaction took place?
a)
Yes
b)
No
30.
A solution is heated and bubbles form. Do you assume a chemical reaction took place?
a)
Yes
b)
No
31.
Two clear and colorless solutions are combined within a test tube. The result is very cloudy. Do you assume a chemical reaction took place?
a)
Yes
b)
No
32.
Two clear and colorless solutions are combined within a test tube. The resulting solution is purple. Do you assume a chemical reaction took place?
a)
Yes
b)
No
33.
Metal is added to a solution in a test tube. The test tube now feels cooler. Do you assume a chemical reaction took place?
a)
Yes
b)
No
34.
A beaker containing a solution is heated. The beaker now feels warm. Do you assume a chemical reaction took place?
a)
Yes
b)
No
35.
What is the term for the → sign in a reaction?
a)
makes
b)
produces
c)
yields
d)
all are correct
36.
What two molecules are produced in a combustion reaction?
a)
CO2 + NH4
b)
SiO2 + H2O
c)
H2O + CO2
d)
CO2 + H2O2
37.
Which set of coefficients properly balances the reaction below?
_Cu + _H2O →_ CuO3 + _H2
a)
1,3,1,5
b)
2,6,2,6
c)
1,3,1,3
d)
1,2,3,4
38.
What is the coefficient of AgNO3 in this reaction?
_AgNO3 + _H2S →_Ag2S+_HNO3
a)
1
b)
2
c)
3
d)
4
39.
What type of reaction is displayed below?
HCl + NaOH → NaCl + H2O
a)
Neutralization
b)
Combustion
c)
Double Replacement
d)
Decomposition
40.
Is the reaction below exothermic or endothermic?
CH4 + 2O2 → CO2 + H2O + heat
a)
exothermic
b)
endothermic
41.
What are the correct coefficients for the reaction below?
_C4H10 + _O2 → _CO2 + _H2O
a)
4, 26, 16, 20
b)
2, 13, 8, 10
c)
1, 6.5, 4, 5
d)
2, 8, 13, 10
42.
What are the correct coefficients to balance the reaction below?
_BaO + _K3N → _Ba3N2 + _K2O
a)
3,2,1,2
b)
3,3,1,3
c)
3,2,1,3
d)
3,1,2,3
43.
The Law of Conservation of Mass states
a)
that matter exists in all states and reacts the same
b)
that matter can only be changed into new substances by introducing a catalyst
c)
that matter exists in the same state throughout any chemical change
d)
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
44.
___________________ are the elements/compounds formed in a chemical reaction (on the right)
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
45.
Is this balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
NO!
46.
What are the reactants in the chemical equation pictured?
a)
CH4 and CO2
b)
CH4 and O2
c)
CO2 and H2O
d)
O2 and H2O
47.
Is this balanced?...
Fe + S --> FeS
a)
YES!
b)
NO!
48.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
49.
Which is the name of the kind of solid substance formed in this figure?  
a)
aqueous 
b)
precipitate
c)
acid
d)
synthesis 
50.
Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas this happens because? 
a)
Magnesium is higher on the reactivity series then hydrogen
b)
magnesium is more reactive than hydrogen
c)
magnesium is able to break the bond between HCl and form MgCl2
d)
both b and c are correct
51.
Provides evidence that a chemical reaction has occurred. 
a)
dissolving 
b)
melting
c)
formation of a gas
d)
bending
52.
Predict the following reaction 
NaCl   +   Ca(NO3)2 --> 
a)
no reaction both products are aqueous 
b)
Calcium chloride and sodium nitrate are produced  
c)
sodium nitrate is a solid formed 
d)
calcium chloride is the solid formed
53.
The word reduction describes 
a)
gain of electrons 
b)
loss of electrons 
c)
number of electrons remains the same
d)
transfer of electrons
54.
The word oxidation describes 
a)
gain of electrons
b)
loss of electrons 
c)
number of electrons remains the same
d)
number of electrons transfered
55.
What are the correct coefficients when this equation is balanced?
KClO3  --> KCl  +  O2
a)
2,2,2
b)
2,2,3
c)
1,2,3
d)
3,3,3
56.
Which half reaction shows the element being reduced.  In the following reaction. 
2Na   +   Cl2  --> 2NaCl
a)
Na0   --> Na+1   +   1e-
b)
Cl20  +  2e-  --> 2Cl-
c)
Na0  +  1e- --> Na+1  
d)
Cl20 --> 2Cl-  + 2e-
57.
A metal is reacted with an acid to produce a salt and a hydrogen gas. What type of reaction has occurred? 
a)
neutralization 
b)
double replacement 
c)
single replacement 
d)
synthesis 

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