|You are to do the following problems. Each one is from a
topic that was covered in the Grade 11 course. The following questions
are a sample of the type of questions that you should be able to answer after
completing the SCH3U course.
|1.||Complete and balance the following chemical equations.|
|(a) Li + H2O --->|
|(b) Pb(NO3)2 + NaCl ------->|
|(c) Na2CO3 +
|2.||Without using a calculator, perform the following arithmetic.|
|(a) (1.0 X 107) X (4.0 X 105)
(2.0 X 108)
|(b) (4.0 X 10-5) X (6.0 X
(3.0 X 10-2)
|(c) (5.0 X 10-4) X (2.0 X
(1.0 X 10-12)
|(d) (3.0 X 104) + (2.1 X 105)|
|(e) (8.0 X 1012)/(2.0 X 10-3)2
|3.|| In what region of the periodic table are
the largest atoms found? Where are the smallest atoms found?
|4.||How are isotopes of the same element alike? How
do they differ?
|5.||Calculate the formula weight or molecular mass of each substance.|
|(a) Sodium chloride, NaCl|
|(b) Sucrose (table sugar), C12H22O11|
|(c) Calcium propionate, Ca(C3H5O2)2, a food additive|
|(d) Ferrous ammonium sulphate, (NH4)2Fe(SO4)2
|6.||How many moles of sulphur atoms must be combined
with 2.0 mol of iron atoms to give iron pyrite, FeS2?
|7.||Sodium bicarbonate, NaHCO3, is one ingredient
of baking powder. In one experiment in a series of tests of different ratios
of ingredients, a scientist used 21.0 g NaHCO3. How many moles
of NaHCO3 were in this sample?
|8.||Balance the following equations:|
|(a) Al2O3 + H2SO4 ----> Al2(SO4)3 + H2O|
|(b) KHCO3 + H3PO4 ----> K2HPO4 + H2O + CO2|
|(c) C9H20 + O2
----> CO2 + H2O
|9.||What is the Pauli Exclusion Principle? What effect
does it have on the populating of orbitals by electrons?
|10.||Predict the electron configurations of (a) S, (b)
K, (c) Ti, and (d) Sn.
|11.||Lactic acid, the substance that causes sour milk
to taste as it does, has a formula weight of 74. It consists of 48.63%
C and 8.18% H, with the rest being oxygen. Calculate the empirical and
molecular formulas of lactic acid, arranging the atomic symbols in alphabetical
|12.||Analysis shows a hydrocarbon to be composed of 80% C and 20% H.|
|a) What is it's simplest formula?|
|b) Its density is 1.34 g/L at STP. What is its molecular mass?|
|c) What is its molecular formula?
|13.||Asbestos, a known cancer-causing agent, has a typical
How many atoms of each element are given in this formula?
|14.||Write the formulas and names of the elements that
exist in nature as molecules that are each composed of two atoms.
|15.||Give chemical names for the following.|
|(a) NaClO3 (b) K2Cr2O7|
|(c) HIO3(aq) (d) MnCl2|
|16.||If a steel cylinder with a volume of 1.50 L contains
10.0 mol of oxygen, under what pressure (in atm) is the oxygen if the temperature
|17.||A gas measuring 525 mL is collected at 104.66 kPa.
What volume does this gas occupy at 99.33 kPa?
|18.||A gas occupies 50.0 mL at standard temperature.
What volume will it occupy at 335oC, pressure unchanged?
|19.||Does the label "0.500 M NaCl" tell how much solution
is in the bottle?
|20.||Calculate the number of grams of each solute that has to be taken to make each of the following solution.|
|(a) 250 mL of 0.100 M NaCl|
|(b) 100 mL of 0.440 M C6H12O6 (glucose)|
|(c) 500 mL of 0.500 M H2SO4
|21.||Supply the charge on each element in the following formulas|
|a) Zn3(PO4)2, b) NaNO2, c) SnBr2,|
| d) HSbO2,
|22.||Calculate the mass percentage composition of each compound.|
|a) MgCl2 , b) Na2SO4 , c) Fe2O3 ,|
, e) AlBr3.6H2O
|23.||A sample of iron ore weighing 2.80 g is to be analyzed
for the percentage of iron. All of the iron in the sample is converted
into iron oxide (Fe2O3) which has a mass of 1.00
g. What is the percentage of iron in the ore?
|24.||What is the relationship between first ionization
energies and metallic and nonmetallic properties?
|25.||A clinical thermometer registers a patient's temperature
to be 37.13 oC. What is this temperature in K?
|26.||The coldest permanently inhabited place on the
Earth is the Siberian village of Oymyakon in Russia. In 1964 the temperature
reached a shivering -69.12 oC! What is this temperature in K?
|27.||Helium has the lowest boiling point of any liquid.
It boils at 4 K. What is it's boiling point in oC?
|28.||Calculate the number of grams of sodium peroxide, Na2O2, that would be required to produce 50 g of oxygen by the following reaction;|
|2 Na2O2 + 2 H2O
---> 4 NaOH + O2
|29.||How many litres of pure O2 at STP, are
required to react completely with 2.43 g of magnesium?
|30.||Magnesium metal reacts quantitatively with oxygen to give magnesium oxide, MgO. If 5.00 g of Mg and 5.00 g of O2 are allowed to react, what weight of MgO is formed, and what weight of which reactant is left in excess?|