Snc2dchemistry Unit Review

SNC2DCHEMISTRY UNIT REVIEW

MULTIPLE CHOICE:

____1.Which of the following statements concerning a bonding model are correct?

1. Metals react by losing electrons.

2. Nonmetals (except for the noble gases) react by gaining electrons.

3. Noble gases are unreactive.

a. / 1 and 3 only / d. / 2 and 3 only
b. / 1 and 2 only / e. / None of the statements are correct.
c. / 1, 2, and 3

____2.In a chemical reaction, a metallic element usually

a. / loses electrons. / d. / gains protons.
b. / gains electrons. / e. / loses protons.
c. / shares electrons.

____3.Ionic bonds are generally formed between

a. / two different gases.
b. / alkali metals and the halogens.
c. / elements in the top horizontal row of the periodic table.
d. / alkaline earth metals and the noble gases.
e. / two different metals.

____4.XF2 is the formula of a metallic fluoride. The formula of the corresponding metallic oxide of Xis

a. / XO. / d. / X2O.
b. / XO2. / e. / X2O3.
c. / XO4.

____5.Which of the following polyatomic ions have names that end in “ate”?

1.ClO3-

2.OH-

3.PO43-

4.HCO32-

5.SO32-

a. / 2, 3, and 4 only / d. / 1, 2, 4, and 5 only
b. / 2, 3, and 5 only / e. / 1, 3, and 4 only
c. / 1 and 5 only

____6.A covalent bond would most likely form between a

a. / chlorine atom and a magnesium atom.
b. / phosphorus atom and chlorine atom.
c. / sodium atom and a fluorine atom.
d. / chlorine atom and an iron atom.
e. / magnesium atom and a sodium atom.

____7.When atoms form chemical bonds they can

a. / gain electrons only. / d. / lose or gain electrons only.
b. / lose electrons only. / e. / share electrons only.
c. / lose, gain, or share electrons.

____8.What does the "  " mean in the chemical equation: water  hydrogen + oxygen

a. / to produce / d. / is balanced
b. / reacts with / e. / a coefficient
c. / a skeleton equation

____9.What does the " + " mean in the chemical equation: phosphorus + oxygen  phosphorus(V) oxide

a. / a skeleton equation / d. / a coefficient
b. / to produce / e. / is balanced
c. / reacts with

____10.The product(s) of the complete combustion of a hydrocarbon is/are:

a. / water, carbon dioxide, and nitrogen dioxide / c. / carbon dioxide only
b. / water only / d. / water and carbon dioxide

____11.Which chemical reaction type does the following belong to?

2K + H2SO4 K2SO4 + H2

a. / synthesis / c. / double displacement
b. / decomposition / d. / single displacement

____12.An acid-base indicator is a substance that:

a. / does not change colour when the pH of the test solution goes from 4 to 9 / c. / can only be made from laboratory chemicals
b. / is always red in acid and always blue in base / d. / turns different colours in acids and bases

____13.Which is true about acids and bases?

a. / acids are liquids, bases are gases / c. / they are rarely found outside of a laboratory
b. / acids dissolve in water, bases do not dissolve in water / d. / acids taste sour, bases taste bitter

____14.What is the proper name of this acid: HNO3?

a. / nitric acid / c. / nitrous acid
b. / nitrite acid / d. / nitrate acid

____15.H3PO3 + KOH  K3PO3 + H2O

In the above reaction, which is the salt?

a. / H3PO3 / c. / K3PO3
b. / KOH / d. / H2O

____16.When the following equation is balanced, the coefficients for P and O2 in order are:

P + O2 P2O5

a. / 6, 4 / d. / 5, 4
b. / 3, 4 / e. / 4, 5
c. / 4, 6

____17.When the following equation (for the production of rust) is balanced, the coefficients for Fe(OH)2 and O2 in order are: Fe(OH)2 + O2 + H2O  Fe(OH)3

a. / 4, 1 / d. / 2, 2
b. / 3, 2 / e. / 1, 4
c. / 2, 3

____18.Which of the following equations is correctly balanced?

a. / 2H2O  H2 + O2 / d. / 2Mg + Cl2 MgCl2
b. / HgO Hg + O2 / e. / None of these is correctly balanced.
c. / C + O2 CO2

____19.Which of the following equations is balanced?

a. / Zn + H2SO4 ZnSO4 + 2H2 / d. / 2H2O + CaCa(OH)2 + H2
b. / H2O + Na NaOH + H2 / e. / None of these is correctly balanced.
c. / 2KClO3KCl + 3O2

____20.The following reaction is an example of the reaction type called:

CH4 + 2 O2 CO2 + 2 H2O

a. / synthesis. / d. / single displacement.
b. / combustion. / e. / double displacement.
c. / decomposition.

____21.The following list contains properties of common acids and bases in water. Which of these properties describe a base?

1.turns litmus blue

2.is not hazardous

3.feels slippery

4.tastes sour

5.reacts with chalk (calcium carbonate).

a. / 1 and 3 only / d. / 1, 4, and 5 only
b. / 2 and 5 only / e. / 1, 2, 3, 4, and 5
c. / 3 and 4 only

____22.When the pH of a solution changes from 2 to 5

a. / the concentration of hydrogen ions decreases by a factor of 1000 / d. / the concentration of hydrogen ions decreases by a factor of 10
b. / the concentration of hydrogen ions increases by a factor of 1000 / e. / the concentration of hydrogen ions increases by a factor of 10
c. / the concentration of hydrogen ions remains unchanged

SHORT ANSWERS

23.Give the chemical name or formula as required.

CaCl2 / Sr3P2
BaI2 / Na3N
hydrogen chloride / potassium oxide
aluminum nitride / sodium fluoride
zinc sulfide / potassium bromide
PbI2 / SnF4
Fe2O3 / Cu2S
iron (II) bromide / tin (II) phosphide
copper (I) nitride / lead (IV) oxide
AgNO3 / Pb(ClO3)2
CaSO4 / K3PO4
magnesium carbonate / calcium hydrogen carbonate
copper(II) sulfate / iron(II) hydroxide
Na2CO3 / Sn(NO3)2
Cu(OH)2 / Al(HCO3)3
zinc chlorate / calcium phosphate
potassium sulfate / lead(IV) carbonate
SO2 / CF4
NBr3 / CS2
carbon dioxide / nitrogen phosphide
silicon tetrabromide / carbon monoxide
HBr(aq) / H3PO3(aq)
nitrous acid / H2CO3(aq)
Mg(OH)2 (aq) / manganese (II) hydroxide
aluminum hydroxide / sulfurous acid

24. a) Describe the pH scale – draw a sketch if necessary.

b) pH 6 is ______times more ______than pH 9

pH 8 is ______times more ______than pH 2

pH 12 is ______times more ______than pH 10

pH 9 is ______times more ______than pH 4

25. What does neutralization mean? Be sure to indicate the types of product formed from a neutralization reaction.

26. Magnesium nitrate reacts with potassium oxide to form magnesium oxide and potassium nitrate.

a)Write the word equation for the above reaction

b)Write the chemical equation for this reaction

c)Balance the above chemical equation

27.Pentane, C5H12 , is a hydrocarbon gas easily kept as a liquid under pressure.

Write out a word equation for the complete combustion of pentane.

Write the balanced chemical equation for the complete combustion of pentane.

What else is produced that is not written as a chemical formula?

If pentane underwent incomplete combustion, what products would be produced?

28. Freshwater swimming pools are kept at a pH between 7.2 and 7.6 to main the correct level of chlorine in the water.

a) What colour would you expect a sample of this pool to be if it was tested with phenolphthalein indicator? Explain your answer?

b) If a pool technician finds that the pH is 7.9, should an acid or base be added to the pool to bring the pH back to an acceptable level. Explain your answer.

29.i) Predict the products of the following chemical equations

ii) Write a balanced chemical equation

ii) Indicate the type of reaction

a) Alumnium reacts with oxygen

b)Butane (C4H8) is burned

c) Ca(s) + O2(g)

d)Ca(OH)2(aq) + HCl(aq)

e) C4H10(g) + O2(g)

f) Al2(SO4)3(aq) + Ca(OH)2(aq)

g)Na + FeSO4(aq)

30. Balance the following equations and identify the type of chemical reaction that is occurring.

a)__Ca(OH)2 + __HCl__CaCl2 + __H2O

b)__C4H10 + __O2__CO2 + __H2O

c)__SO2 + __O2__ SO3

d)__Al + __H2SO4__Al2(SO4)3 + __H2

e)__AgNO3 + __CaCl2__AgCl + __Ca(NO3)2

f)__Ag2O __Ag + __O2

g)__Fe + __Cl2__FeCl3

h)__Br2 + __KI  I2 + __KBr

i)__C5H12O + __O2__CO2 + __H2O

j)__N2 + __O2__ N2O3

k)__AsCl3 + __H2S__As2S3 + __HCl

l)__ FeCl3 + __ (NH4)2S __ Fe2S3 + __ NH4Cl

m)__KNO3__KNO2 + __O2