DATE: NAME: CLASS: SCI 10AP- CHEM
True/false: /5 Matching: /5 Fill in blank: /5 Multiple choice: /10 Short answer: /5 Long answer: /16
TOTAL: /46
Chapter 2 Test
True/False (5marks)
On the line provided, indicate whether each statement is true (T) or false (F). If the sentence is false, rewrite it to make it true
___ 1. Blue litmus paper turns red in the presence of a base.
___ 2. Only acidic solutions are capable of conducting electricity.
___ 3. The cation is always written first when writing the formula for an ionic compound.
___ 4. The name for any anion always ends in “-ide”.
___ 5. All cations should be named using the Stock system.
Matching (5marks)
Match each description in column A with the correct term in column B. Write the letter for the term on the line beside the description.
A
___ 6. substance that dissolves in water to release hydrogen ions ___ 7. ion that consists of one or more different atoms joined by
covalent bonds
___ 8. process that takes place when acids and bases are mixed ___ 9. substance that is used to identify whether a solution is
acidic or basic
___ 10. compound that is formed of non-metals joined only by covalent bonds
B
(a) ionic compound (b) molar mass (c) anion (d) cation
(e) molecular compound (f) acid
(g) neutralization (h) base
Fill in the Blanks(5marks)
Complete each sentence with the correct term.
11. A(n) _____________ bond is an intermolecular bond that has a permanent difference in charge across the bond. 12. When naming a(n) _________________ compound, prefixes are used to indicate how many of each type of
atom are present.
13. The ___________system is a system of nomenclature in which the charge on the cation is written, in parentheses, as a Roman numeral after the name of the metal.
14. A(n) _____________ compound always conducts electricity when melted.
15. pH is a measure of the amount of ____________________ that is contained in a given volume of solution.
Multiple Choice (10marks)
Circle the letter for the choice that best completes the statement or answers the question. 16. What is the systematic (IUPAC) name for the compound Fe2O3?
(a) iron(III) oxide
(b) iron oxide (c) iron(II) oxide(d) iron(II) trioxide
17. What is the systematic (IUPAC) name for the compound S2O3?
(a) sulfur oxide (b) sulfur(III) oxide
(c) sulfur trioxide (d) disulfur trioxide
18. What is the correct formula for the compound that contains magnesium and phosphate ions? (a) MgPO4
(b) Mg3PO4
(c) Mg2(PO4)3
(d) Mg3(PO4)2
19. Which compound has no covalent bonds? (a) Na2SO4
(b) KCl
(c) HClO3
(d) CH3Cl
20. The name for H2SO3(aq) is
(a) hydrosulfuric acid (b) sulfuric acid
(c) sulfurous acid (d) hydrogen sulfite acid 21. Substances with a pH above 7 are considered to be
(a) basic (b) acidic
(c) salty (d) ionic 22. Which is not a characteristic of acids?
(a) bitter taste (b) turn litmus red
(c) react with bases to form salts
(d) react with active metals to form H2 gas
23. Four compounds are dissolved in water. Which of the resulting solutions (I to IV) are good conductors of electricity?
I. H2CO3(aq)
II. NH4OH(aq)
III. CH3OH(aq)
IV. NaCl(aq)
(a) A, B, and C only (b) A and C only
24. The attraction between the partial negative charge of one water molecule and the partial positive charge of another water molecule is referred to as a(n)
(a) polar covalent bond (b) ionic bond
(c) hydrogen bond (d) hydrophobic bond 25. Which statement best explains the unusually high boiling point of water?
(a) Water contains H+ and OH– ions.
(b) The covalent OH bond in water is very strong.
(c) The hydrogen bonds that hold water molecules together are strong. (d) Water molecules interact with each other through ionic bonds.
Short Answer (5marks)
Answer each question in the space provided. Be sure to use complete sentences. 26. What is the key difference between an ionic bond and a covalent bond? (2 marks)
27. Why is sodium(I) hydroxide not the correct name for NaOH? (1 mark)
28. Describe the difference between acids and bases, according to Arrhenius. (2 marks)
Long Answer (16marks)
Answer each question in the space provided. Use complete sentences.
29. A group of students is given four containers, labelled A, B, C, and D. The students assemble the following list of characteristics for the four unknown substances.
Substance State at SATP Litmus paper test Conductivity test
A liquid red turns blue conducts
B solid no change when B
dissolved in water
conducts when dissolved in water
C liquid no change does not conduct
D gas blue turns red when
D bubbled through water
conducts when bubbled through water
(b) The students are told that the substances are methanol, hydrogen sulfide, aqueous ammonium sulfide solution, and aqueous sodium hydroxide solution. In the following table, write the chemical formula for each substance and the letter that corresponds to the substance.(8marks)
Substance Correct chemical formula
Substance letter (A, B, C, or D)
methanol
hydrogen sulfide
sodium hydroxide (aqueous solution)
Answers
1. F: Blue litmus paper turns red in the presence of an acid.
2. F: Basic solutions and neutral solutions are also capable of conducting electricity. 3. T
4. F: The names of binary ionic compounds almost always end in “ide.”
5. F: Only cations that have more than one possible charge should be named using the Stock system. 6. (f)
7. (k) 8. (g) 9. (l) 10. (e) 11. polar 12. molecular 13. Stock 14. ionic 15. hydrogen 16. (a) 17. (d) 18. (d) 19. (b) 20. (c) 21. (a) 22. (a) 23. (d) 24. (c) 25. (c)
26. An ionic bond exists between a cation and an anion in an ionic compound. An ionic bond is formed when electrons are transferred from a metal to a non-metal. A covalent bond exists within a molecular compound. A covalent bond is formed when non-metals share electrons.
27. You do not use the Stock system to name sodium cations. Sodium forms only one cation: Na+. Therefore, there is no need to indicate its charge.
28. Acids dissolve in water to release H+ ions. Bases dissolve in water to release OH– ions. 29. (a) Substance A is a base because it turns red litmus blue and conducts electricity.
Substance B is an ionic compound because it conducts electricity when dissolved in water.
Substance C is a molecular compound because it is a liquid at room temperature and does not conduct electricity or change the colour of litmus.
Substance D is an acid because it turns blue litmus red when dissolved in water and also conducts electricity when dissolved in water.
(b) Answers are in boldface.
Substance
Correct chemical
formula Substance letter (A, B, C, or D)
methanol CH3OH(l) C
hydrogen sulfide H2S(g) D sodium hydroxide
(aqueous solution)
NaOH(aq) A
ammonium sulfide (aqueous solution)
