Science 20 Unit A Mid Unit Test
NAME:_____________________
DATE: _____________________
MARK:
/35
%
1. When Sulphur becomes an ion it
a. Looses 2 electrons
b. Gains 2 electrons
c. Looses 2 protons
d. Gains 2 protons
2. The calcium ion ends up with an electron configuration identical to
a. Helium
b. Neon
c. Argon
d. Krypton
3. The bond between the chlorine atoms in Cl2 is considered a
a. Ionic bond
b. Covalent bond
c. Metallic bond
d. Nobel bond
4. The reaction that makes a chemical cold pack work is considered what type of
reaction?
a. Endothermic
b. Exothermic
c. Ionic
d. Covalent
5. The iodine ion has how many neutrons?
a. 53
b. 54
c. 74
d. 127
6. How many valence electrons does the phosphide ion have?
a. 5
b. 8
c. 15
d. 18
7. The correct number of electrons per electron level for the arsenic atom is from
inner most to outer most
a. 2, 8, 8, 15
b. 2, 8, 8, 18
c. 8, 8, 8, 8, 1
d. 2, 8, 8, 8, 7
GLO 20–A1.1k: explain how dissolving substances in water is often a prerequisite for
chemical reactions and chemical changes
8. Disassociation is
a. The separation of molecular compounds into individual ions in a
solution
b. The separation of ionic compounds into individual ions in a solution
c. The separation of molecular compounds into separate molecules in
solution
d. The separation of ionic compounds into separate molecules in
solution
9. Which of the following theories supports the fact that dissolving substances in
water if often a prerequisite for chemical reactions?
a. Collision-reaction theory
b. Collision-combustion theory
c. Dissolving-reaction theory
d. Dissociation-reaction theory
10. Which of the following would produce a chemical reaction?
a. Zn(s) + AgNO3 (s)
b. Ba(NO3)2 (s) + Na2CO3 (s)
c. Zn(s) + AgNO3 (aq)
d. CuSO4 (s) + Na3PO4 (s)
Use the following information to answer the next question
Natural Hair Conditioner Recipe
- 30 ml carrier oil
- 15 ml emulsifying wax
- 2.5 ml vitamin E
- 125 ml distilled water
- 5 ml grapefruit seed extract
11. Using the information from above which ingredient is considered the solvent?
a. The carrier oil
b. The emulsifying wax
c. The distilled water
d. The grapefruit seed extract
20–A1.2k: differentiate, on the basis of properties, between electrolytes and nonelectrolytes
12. If I place a beaker of unknown liquid into a conductivity apparatus, and the light
bulb does not light up which of the following statements is true?
a. The liquid is an acid
b. The liquid is an ionic compound
c. The liquid is molecular
d. The compound is a base
13. Na2CO3 (aq) is a/an
a. Electrolyte because it is ionic
b. Electrolyte because it is molecular
c. Nonelectrolyte because it is ionic
d. Nonelectrolyte because it is molecular
14. C12H22O11 (aq) is a/an
a. Electrolyte because it is ionic
b. Electrolyte because it is molecular
c. Nonelectrolyte because it is ionic
d. Nonelectrolyte because it is molecular
15. AlCl3 (aq) is a/an
a. Electrolyte because it is ionic
b. Electrolyte because it is molecular
c. Nonelectrolyte because it is ionic
d. Nonelectrolyte because it is molecular
Use the following to answer the next question
i.
ii.
iii.
iv.
Acid
Base
Ionic
Molecular
16. Which of the following would be considered an electrolyte?
a. i
b. i, ii
c. ii, iii, iv
d. i, ii, iii,
20–A1.3k: compare and explain how concentrations of solutions are expressed in moles per litre,
percent by volume and parts per million
17. If I looked on a juice box for the concentration of real juice what would be the
most likely format to report this concentration?
a. Molar concentration
b. Parts per million
c. Percent by volume
d. None of the above
18. If I looked on a bottle of water for the concentration of sodium what would be
the most likely format to report this concentration?
a. Molar concentration
b. Parts per million
c. Percent by volume
d. None of the above
19. When making a solution for the lab the concentration should be expressed in
a. Molar concentration
b. Parts per million
c. Percent by volume
d. None of the above
20. You have two mass measurements and are asked to determine the
concentration of solute. The type of concentration that the question is asking for
is most likely
a. Molar concentration
b. Parts per million
c. Percent by volume
d. None of the above
21. You have 100 ml of concentrated hydrochloric acid and 100 ml of dilute
hydrochloric acid. Which of the following statements is true?
a. The concentrated hydrochloric acid will have a stronger reaction
when used
b. The dilute hydrochloric acid will have a stronger reaction when used
c. Both samples of hydrochloric acid will have the same strength of
reaction when used
d. It is impossible to tell which solution will have a stronger reaction
when used
20–A1.4k determine the concentration of solutions in moles per litre, percent by volume and parts
per million
22. A student takes 8.50g of potassium permanganate, KMnO4 (s), and dissolves it
into 50.0 ml of water. How many moles of potassium permanganate are in the
solution?
a. 0.052 mol
b. 0.17 mol
c. 5.88 mol
d. 19.18 mol
23. You dissolve 37.0g of sodium sulphate, Na2SO4 (s) into 150 ml of water. What is
the concentration of the solution?
a. 25.59 mol/L
b. 4.05 mol/L
c. 1.74 mol/L
d. 0.58 mol/L
24. A hair product requires you to make a 25% by volume solution of hydrogen
peroxide in water. If you need 300 ml of this solution how much peroxide do
you need?
a. 8.3 ml
b. 12 ml
c. 75 ml
d. 83.3 ml
25. How many moles of sodium chloride, NaCl, do you need to make 550 ml of a 3.5
mol/L solution?
a. 15.71 mol
b. 0.157 mol
c. 192.5 mol
d. 1.93 mol
26. A 250g bottle of water contains 3.5 x 10-3g of mercury. What is the
concentration of mercury in parts per million?
a. 0.014 ppm
b. 14 ppm
c. 52 ppm
d. 71 ppm
27. A mosquito repellent contains 56 ml of DEET in every 150 ml bottle. What is the
percent by volume concentration of DEET in this repellent?
a. 37%
b. 27%
c. 19%
d. 14%
28. Canadian law prevents the sale of fish for consumption containing more then
2.00 ppm of PCBs. A 375 g sample of fish is tested and found to contain the
maximum allowable concentration of PCBs. Determine the mass of PCBs in this
sample of fish.
a. 7.5 x 10-4 g
b. 7.5 x 10-2 g
c. 1.9 x 10-4 g
d. 1.9 x 10-2 g
Use the following information to answer the next two questions
Ingredients in Brand X Shampoo
Ingredient
Water
Ammonium lauryl sulphate solution
Ammonium laureth sulphate solution
Ammonium dodecylbenzene sulfonate solution
Lauramide DEA solution
Dimethicone solution
Disodium EDTA solution
Total
Volume
164 ml
164 ml
159 ml
18 ml
16 ml
3 ml
1 ml
525 ml
29. Calculate the percent by volume of the Ammonium dodecylbenzene sulfonate
solution in the shampoo
a. 12%
b. 11%
c. 3%
d. 1%
30. Calculate the percent by volume of the Ammonium lauryl sulphate solution in
the shampoo
a. 50%
b. 31%
c. 25%
d. 11%
20–A1.5k: determine the concentration of diluted solutions and the quantities of a concentrated
solution and of water to use when diluting.
31. You have 65.0 ml of a 0.865 mol/L solution of sodium chloride, NaCl. What is
the concentration once it has been diluted to a final volume of 150.0 ml?
a. 1.99 mol/L
b. 0.50 mol/L
c. 0.432 mol/L
d. 0.375 mol/L
32. Sulphuric acid is used to make chlorine dioxide for bleaching in the pulp and
paper industry. A technician needs to make 275 L of a solution with a
concentration of 4.25 mol/L. The technician only has sulphuric acid with a
concentration of 6.75 mol/L. How much of the more concentrated solution does
he need?
a. 437L
b. 324 L
c. 173L
d. 83 L
33. A large beaker contains 655 ml of a standard solution of sulphuric acid with a
concentration of 10.0 mol/L. this beaker is placed in the fume hood where
evaporation can occur. Determine the amount of water that would have to
evaporate in order for the solution to have a concentration of 11.5 mol/L
a. 98 ml
b. 85 ml
c. 570 ml
d. 753 ml
20–A1.3s: evaluate the risk involved in the handling, storage and disposal of solutions that are in
common use in the laboratory, in the home and in industry across Alberta
Use the following picture to answer the next question
34. The correct names for the three symbols above are:
a. Flammable, poisonous, radioactive
b. Flammable, toxic, biohazardous
c. Oxidizing, poisonous, toxic
d. Flammable, poisonous, biohazardous
35. When skin comes into contact with concentrated acid it is common safety
procedure to flush the skin with plenty of water. This safety protocol is used
because
a. The water will be cooler then the acid providing relief
b. The acid will become more dilute as you flush the skin with water
c. The water makes the skin thicker, allowing more to burn before you
get hurt
d. The acid will become more concentrated as you flush it with water