Chemistry Unit Test

Question 1

The ions that combine to form Magnesium Phosphate are:
a) Mg+3 and P-3
b) Mg+2 and P-3
c)P+3 and Mg-2?
d) Mg+2 and PO4 -3
e) Mg+3 and PO3 -3

Answer 1

1. The ions that combine to form Magnesium phosphate are:
   d) Mg+2 and PO4 -3

Question 2

Which of the following is an acid?
a) H2SO3 (s)
b) Mg(OH)2 (aq)
c)H2CO3(aq)
d) Al(OH)3
e) H2SO3(l)

Answer 2

c)H2CO3(aq)

Question 3

When a metal is added to HCl(aq), what is produced?
(a) hydrogen gas
b) base
C)oxygen gas and an ionic compound
d) an oxyacid
e)oxygen gas and a base

Answer 3

(a) hydrogen gas

Question 4

Which of the following elements do not form a diatomic molecule
a) chlorine
b) hydrogen
c)oxygen
d) sulfur
e) iodine

Answer 4

d) sulfur

Question 5

Atoms of element A have 3 electrons in their outermost shell. Atoms of element B have 7
electrons in their outermost shell. The formula of the compound formed between A and B
is:
a) A7B3
b) A3B
c) AB3
d) A3B7
e) AB

Answer 5

a) AB3

Question 6

how many oxygens in Al(NO3)3 + Na2co3 - Al2(CO3)3 + NaNO3?
a) 3
b)6
C)9
d)12
e)24

Answer 6

d)24

Question 7

The following list contains properties of common acids and bases in water. Which of these
properties describe an acid:

1. turns blue litmus paper red;
2. leaves phenolphthalein clear;
3. feels slippery and have a tangy taste;
4. tastes sour;
5. reacts with hydrochloric acid

a) 1 and 5 only
b) 1,2 and 4 only
c) 1,3 and 5 only
e) 2,3,4, and 5

Answer 7

b) 1,2 and 4 only

Question 8

Which a the following compounds has a metal with a charge of +2?
a) KOH
b) K2O
c)PbO
d)Mg3P2
e)c and d are correct

Answer 8

e) c and d are correct

Question 9

Which one of the following reactions would best fit a neutralization reaction?
a iron (II) oxide + hydrochloric acid
b) iron (Il) bromide + copper sulphate
c) burning of propane
d) hydrogen + oxygen
e) phosphoric acid + magnesium hydroxide

Answer 9

e) phosphoric acid + magnesium hydroxide

Question 10

A solution of vinegar (acid) is found to have a pH of 3 and a glass of orange juice
is found to have a pH of 5. This means the vinegar is (——)times more acidic than the orange juice.

Answer 10

100

Question 11

The type of chemical reaction that occurs when a compound breaks down is called a (——–) reaction.

Answer 11

decomposition reaction

Question 12

Metal elements in group # (—-) always lose two electrons to become stable
ions

Answer 12

2

Question 13

Consider the following chemical reaction for question (4):
NaOH (aq) + HNO; (aq) - H,O (1) + NaNO, (aq)

D. The chemical name of the product, which remains an aqueous solution, would
be (—-)

Answer 13

sodium Nitrate

Question 14

Consider the following for 5.

I) 7p, 7 n°, 7 e-
II) 7p, 7 n°, 10 e-
III)10 p, 7 n°, 7 e-
IV) -7p, 7 n°, 4 e-
V) 4p*, 7 n°, 7 e-

E. (—–) represents the structure of a nitrogen ion.

Answer 14

II

Question 15

Phosphorus tetrachloride

Answer 15

PCl4

Question 16

Cu3N2

Answer 16

Copper (II) Nitride

Question 17

Iron (II) Sulfide

Answer 17

FeS

Question 18

H2S (aq)

Answer 18

Hydrosulfuric acid

Question 19

Ammonium Carbonate

Answer 19

(NH4)2CO3

Question 20

2. Balance the following completed skeleton equations. (2 Marks T/I)
   __Li+__H2SO4 = ___H2+ ___Li2SO4

Answer 20

2Li+H2SO4 = H2+ Li2SO4

Question 21

Balance

___HCl(aq) +___Ca(OH)2 (aq)= ____ CaCl2(aq) +___H2O(l)

Answer 21

__2_HCl(aq) +___Ca(OH)2 (aq)= ____ CaCl2(aq) +_2__H2O(l)

Question 22

___HCl(aq) +___Ca(OH)2 (aq)= ____ CaCl2(aq) +___H2O(l)

word equation

Answer 22

Hydrochloric acid + Calcium Hydroxide= Calcium Chloride + water

Question 23

Lead (II) metal is placed into a solution of tin (IV) nitrate…..
Balanced Chemical Equation:
Type of Chemical Reaction:

Answer 23

Single
Displacement

Question 24

Magnesium bromide reacts with a solution of copper (I) oxide..

Answer 24

Double Displacement

Question 25

The breakdown of potassium oxide….
Balanced Chemical Equation:
Type of Chemical Reaction:

Answer 25

Decomposition

Question 26

1. Show the bond formation that occurs to produce calcium fluoride. Start with the lewis
   dot diagram of atoms, and include the transfer of electrons and ions produced. (3 Marks
   App.)

Answer 26

draw diaagram

Question 27

2.
A piece of calcium oxide has a mass of 20.5 g. When heated, a chemical reaction
happens. A solid piece of calcium and oxygen gas are produced. If the solid piece of
calcium has a mass of 9.5 g, what would you predict the mass of the oxygen gas to be?
Explain. (2 marks App.)

Answer 27

It would be 11 grams because the law of conversation states that the mass on both sides has to be equal.

Question 28

The stomach contains a solution of hydrochloric acid called gastric juice, which has a normal pH of 2.5. After eating spicy foods and a large coke, the pH of your stomach
drops to a pH of 0.5.
a. You have two items in your medicine cabinet: Mg(OH), and H2CO2. Which medication would you take to bring your stomach pH back to normal? Explain
your reasoning by discussing the type of reaction that occurs. (2 marks App.)

Answer 28

I would use Mg(OH)2 because it is a base. In order for you to neutralize an acid you need to use a base the reaction would be neutralization.

Question 29

b. Does this increase or decrease the acidity of your stomach? Explaining by
indicating the relationship between pH and acidity/basicity. (2 marks)

Answer 29

It will decrease the acidity in your stomach because to neutralize something you need a PH of 7. If the Ph is 2.5 then obviously when you neutralize it to 7 you will gain acidity.