4th Nine Weeks Study Guide
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____
____
1. Which of the following is a balanced chemical equation?
a. H2O2  H2O + O2
b. 2 Fe2O3 + 3 C  4 Fe + 3 CO2
c. SO2 + O2 + 2 H2O  4 H2SO4
d. 2 Mg + HC1  MgCl2 + H2
2. Which is the correct chemical equation for the following statement? Sodium reacts with oxygen in a 2 to 1
ratio to produce sodium oxide.
a. 2 Na + O2  Na2O
b. Na2O a + O2
c. Na2O + O2 a
d. Na2 + O2 aO
Short Answer
3. .
Magnesium bromide is an ionic compound with the chemical formula MgBr2. What does the “2” tell
you? There are two magnesium ions to every bromide ion.
4. Each family in the periodic table has its own characteristic properties based on the number of valence
electrons
5. When an atom loses an electron, it becomes a __positive________ ion
6. An ionic bond is the attraction between __oppositely charged______ ions
7. Ions that are made of more than one atom are examples of __polyatomic_______ ions
8. What is the chemical name for the compound with the formula Na2S? Sodium Sulfide
9. List the characteristic property of ionic compound -Good conductors of electricity, high boiling point, high
melting point, crystal lattice
10. In what form can an ionic compound conduct electricity? When dissolved in water
11. A chemical bond formed when two atoms share electrons is called a(n) ___covalent bond______ bond
12. A covalent bond in which electrons are shared unequally is ___polar bond
13. In the chemical formula for an ionic compound, which item is written first? Positive ion
14. Electrons involved in bonding between atoms are __valence ________ electrons
15. What is the greatest number of valence electrons an atom can have? 8
16. Water is polar and oil is nonpolar. What happens when the two liquids are poured into the same container?
They do not mix
17. If atoms of a halogen nonmetal (Group 17) gain one electron, the atoms then have 8 electrons
18. Ionic compounds are electrically neutral
19. What does it that means that metals can be rolled into thin sheets, as in aluminum foil, or beaten into
complex shapes? malleable
20. A mixture that is made of two or more elements—one that is a metal—that has the properties of metal is a(n)
alloy
21. What does it mean can be pulled into thin strands or wires? ductile
22. The attraction between a positive metal ion and the electrons surrounding it is a(n) metallic bonding
23. What type of reaction is FeS + 2 HCl  FeCl2 + H2S? double displacement reaction
24. A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to
be balanced
25. What are the indicators of a chemical reaction change in color, heat and light emission, precipitate, odor
26. A shorter, easier way to show chemical reactions, using symbols instead of words, is called a balanced
equation
27. The substances listed on the left side of a chemical equation are the reactants
28. In chemical reactions, what does the principle of conservation of mass mean? Matter can neither be created
nor destroyed
29. A chemical reaction that absorbs energy in the form of heat is described as endo thermic
30. A rapid reaction between oxygen and a fuel is known as combustion
31. The number placed below an element’s symbol in a chemical formula is called a subscript
Use the diagram to answer each question.
32. List three elements from the group containing the most reactive nonmetals. Fluorine, chlorine, bromine
33. How many atoms of a Group 17 element would be needed to react with one atom of a Group 2 element?
a. 1
b. 2
c. 3
d. 4
34. In an electron dot diagram of aluminum (Al), how many dots should be drawn around the element’s symbol?
Why 3. Because it is in group 13
35. Which group of elements loses electrons most easily? Group 1
36. Which group contains elements with two valence electrons? Group 2
Use the diagram to answer each question.
37. Is the reaction that occurs in the diagram endothermic or exothermic? Explain. Exothermic , because it is
giving out heat
38. The flame from the candle gives off black smoke. Does this statement describe evidence for chemical change.
Yes
Use the diagram to answer each question.
39. What type of chemical reaction is represented in the diagram? synthesis
40. Identify the reactant(s) and product(s) of the reaction.
Reactants- hydrogen and oxygen
Products-water
4th Nine Weeks Study Guide
Answer Section
MULTIPLE CHOICE
1. ANS: B
OBJ: PS.6.2.3
2. ANS: A
DIF: L3
REF: p. PS-198, p. PS-199
DIF: L3
REF: p. PS-195
SHORT ANSWER
3. ANS:
There are two bromide ions for every magnesium ion.
DIF: L3
4. ANS:
valence electrons.
REF: p. PS-161
OBJ: PS.5.2.2
DIF: L2
5. ANS:
positive ion.
REF: p. PS-152
OBJ: PS.5.1.2
DIF: L1
REF: p. PS-159
6. ANS:
oppositely charged ions.
OBJ: PS.5.2.1
DIF: L2
7. ANS:
polyatomic ions.
REF: p. PS-160
OBJ: PS.5.2.1
DIF: L1
8. ANS:
sodium sulfide
REF: p. PS-159
OBJ: PS.5.2.1
DIF: L2
REF: p. PS-161
OBJ: PS.5.2.2
9. ANS:
They form hard, brittle crystals with characteristic shapes.
DIF: L2
REF: p. PS-162
10. ANS:
when dissolved in water
OBJ: PS.5.2.3
DIF: L1
11. ANS:
covalent bond.
REF: p. PS-163
OBJ: PS.5.2.3
DIF: L1
12. ANS:
REF: p. PS-167
OBJ: PS.5.3.1
OBJ: PS.6.2.1
polar.
DIF: L1
13. ANS:
positive ion
REF: p. PS-170
OBJ: PS.5.3.3
DIF: L1
14. ANS:
valence electrons.
REF: p. PS-161
OBJ: PS.5.2.2
DIF: L2
15. ANS:
8
REF: p. PS-150
OBJ: PS.5.1.1
DIF: L1
REF: p. PS-151
16. ANS:
The liquids do not mix.
OBJ: PS.5.1.2
DIF: L2
REF: p. PS-171
17. ANS:
8 valence electrons.
OBJ: PS.5.3.3
DIF: L2
18. ANS:
neutral.
REF: p. PS-153
OBJ: PS.5.1.2
DIF: L3
19. ANS:
malleable
REF: p. PS-161
OBJ: PS.5.2.1
DIF: L1
20. ANS:
alloy.
REF: p. PS-175
OBJ: PS.5.4.3
DIF: L1
21. ANS:
ductile
REF: p. PS-173
OBJ: PS.5.4.1
DIF: L1
22. ANS:
metallic bond.
REF: p. PS-175
OBJ: PS.5.4.3
DIF: L1
REF: p. PS-174
23. ANS:
a double replacement reaction
OBJ: PS.5.4.2
DIF: L2
24. ANS:
balanced.
OBJ: PS.6.2.4
REF: p. PS-201
DIF: L1
REF: p. PS-198
OBJ: PS.6.2.3
25. ANS:
the production of one or more new substances.
DIF: L2
26. ANS:
chemical equation.
REF: p. PS-188
OBJ: PS.6.1.2
DIF: L1
27. ANS:
reactants.
REF: p. PS-195
OBJ: PS.6.2.1
DIF: L2
REF: p. PS-195
28. ANS:
Matter is not created or destroyed.
OBJ: PS.6.2.1
DIF: L1
29. ANS:
endothermic.
REF: p. PS-196
OBJ: PS.6.2.2
DIF: L2
30. ANS:
combustion.
REF: p. PS-190
OBJ: PS.6.1.2
DIF: L1
31. ANS:
subscript.
REF: p. PS-213
OBJ: PS.6.4.1
DIF: L1
REF: p. PS-199
OBJ: PS.6.2.3
32. ANS:
Accept any three elements from Group 17: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At).
DIF: L3
REF: p. PS-153
OBJ: PS.5.1.2
33. ANS:
Two. Atoms of elements in Group 17 form ions with a charge of 1–, and atoms of elements in Group 2 form
ions with a charge of 2+. It would take two ions of a Group 17 element to balance the charge of one ion of a
Group 2 element.
DIF: L3
REF: p. PS-161
OBJ: PS.5.2.1
34. ANS:
Three. Elements in Group 13 have 3 valence electrons.
DIF: L2
35. ANS:
Group 1
REF: p. PS-152
OBJ: PS.5.1.2
DIF: L2
36. ANS:
Group 2
REF: p. PS-153
OBJ: PS.5.1.2
DIF: L2
REF: p. PS-152
OBJ: PS.5.1.2
37. ANS:
Exothermic. Heat is released when the candle (wax) burns.
DIF: L3
REF: p. PS-191
OBJ: PS.6.1.2
38. ANS:
A chemical change. The black smoke is evidence of the formation of a new substance, which means a
chemical change occurred.
DIF: L2
REF: p. PS-188
OBJ: PS.6.1.2
39. ANS:
Synthesis. Two elements (hydrogen and oxygen) combine to form a compound (water).
DIF: L2
REF: p. PS-200
OBJ: PS.6.2.4
40. ANS:
a. Hydrogen and oxygen are the reactants, and water is the product.
DIF: L2
REF: p. PS-195
OBJ: PS.6.2.1