AnswersSY2026-27 - 2003340 Chemistry 1 Sem 2 CRWriting and Balancing Chemical Equations

Writing and Balancing Chemical Equations Answers

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1
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Which chemical equation is unbalanced?

A
C + O2 CO2
Option A
B
Sr + O2 2SrO
Option B
C
6H2 + 3O2 6H2O
Option C
D
H2 + H2 + O2 H2O + H2O
Option D
2
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Which equation has both a liquid and a gas as products?

A
2 upper H g upper O (s) right arrow 2 upper H g (l) plus upper O subscript 2 (g).
Option A
B
2 upper M g (s) plus upper O subscript 2 (g) right arrow 2 upper M g upper O (s).
Option B
C
1 UJpper K upper C l upper O subscript 3 (s) right arrow 2 upper K upper C l (s) plus 3 upper O subscript 2 (g).
Option C
D
Upper M g (s) plus 2 upper H upper C l (a q) right arrow upper H subscript 2 (g) plus upper M g upper C l subscript 2 (a q).
Option D
3

Which formula equation represents the burning of sulfur to produce sulfur dioxide?

A
Upper S (s) plus upper O subscript 2 (g) right arrow with delta above upper S upper O subscript 2 (g).
Option A
B
2 upper H subscript 2 upper s (s) plus 3 upper 0 subscript 2 (g) right arrow 2 upper H subscript 2 upper O (l) plus 2 upper S upper 0 subscript 2 (g).
Option B
C
4 upper F e upper S subscript 2 plus 11 upper O subscript 2 right arrow 2 upper F e subscript 2 upper O subscript 3 plus 8 upper S upper O subscript 2.
Option C
D
2 upper S upper O subscript 2 (g) plus upper O subscript 2 (g) right arrow with upper V subscript 2 upper O subscript 5 above arrow 2 upper S upper O subscript 3 (g).
Option D
4

Which statement best describes the formula equation Cl2(g) + 2KBr(aq) 2KCl(aq)+ Br2(l)?

Question illustration
A
Carbon iodide reacts with potassium bromide to form potassium carbon iodide and bromine.
B
Bromine gas reacts with a solution of potassium chloride to form potassium bromide and chlorine gas.
C
Potassium bromine gas reacts with liquid chlorine to form potassium chloride in solution and bromine gas.
D
Chlorine gas reacts with potassium bromide to form potassium chloride in solution and liquid bromine.
5

Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. Which word equation best represents this chemical reaction?

A
isopropanol carbon dioxide + water + heat
Option A
B
isopropanol carbon dioxide + water + oxygen
Option B
C
isopropanol + oxygen carbon dioxide + water + heat
Option C
D
isopropanol + oxygen + heat carbon dioxide + water
Option D
6

Which word equation shows hydrogen reacting with oxygen to form water?

A
oxygen + water hydrogen
Option A
B
hydrogen + oxygen water
Option B
C
oxygen + water hydrogen + water
Option C
D
hydrogen + water oxygen
Option D
7

Consider the unbalanced equation for the oxidation of butene.C4H8 + 6O2 CO2 + H2OFor each molecule of C4H8 that reacts, how many molecules of carbon dioxide and water are produced?

Question illustration
A
two carbon dioxide molecules and two water molecules
B
four carbon dioxide molecules and four water molecules
C
two carbon dioxide molecules and four water molecules
D
four carbon dioxide molecules and two water molecules
8

What is the formula equation for the reaction between sulfuric acid and dissolved sodium hydroxide if all products and reactants are in the aqueous or liquid phase?

A
Upper H upper C l (a q) plus upper N a upper O upper H (a q) right arrow upper N a upper C l (s) plus upper H subscript 2 upper O (l).
Option A
B
Upper H subscript 2 upper S upper O subscript 4 (a q) plus upper C a (upper O upper H) subscript 2 (a q q) right arrow upper C a upper S upper O subscript 4 (a q) plus 2 upper H subscript 2 upper O (l).
Option B
C
Upper H subscript 2 upper S upper O subscript 4 (a q) plus 2 upper N a upper O upper H (a q) right arrow upper N a subscript 2 upper A upper O subscript 4 (a q) plus 2 upper H subscript 2 upper O (l).
Option C
D
2 upper H subscript 3 upper P upper O subscript 4 (a q) plus 3 upper C a (upper O upper H) subscript 2 (a q) right arrow upper C a subscript 3 (upper PO upper O) subscript 4 (s) plus 6 upper H subscript 2 upper O (l).
Option D
9

According to the law of conservation of

A
charge
B
energy
C
mass
D
momentum
10

In a chemical equation, which symbol should be used to indicate that a substance is in solution?

A
(s)
B
(g)
C
(l)
D
(aq)

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