AnswersSY2026-27 - 2003340 Chemistry 1 Sem 2 CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

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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
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Iron reacts with oxygen in a chemical hand-warmer. How should this reaction be categorized?

A
as an exothermic process because it releases heat
B
as an endothermic process because it releases heat
C
as an exothermic process because it absorbs heat
D
as an endothermic process because it absorbs heat
43

Which statement is true for most chemical reactions?

A
An energy change occurs during the breaking and forming of bonds.
B
The internal energy of the system increases during a reaction.
C
Energy is released during the formation of reactants.
D
The enthalpy of the products is higher than the enthalpy of the reactants.
44

Which method would increase the solubility of a gas?

A
increasing the pressure
B
stirring the solvent quickly
C
increasing the temperature
D
decreasing the amount of solvent
45

Two samples of carbon come into contact. A heat transfer will occur between sample A and sample B. What must be true for heat to transfer from sample A to sample B?

A
The average kinetic energy of A is greater than that of B.
B
The average kinetic energy of B is greater than that of A.
C
The average kinetic energy of both samples is equal.
D
The average kinetic energy does not determine the direction of heat transfer.
46

The initial temperature of a bomb calorimeter is 28.50°C. When a chemist carries out a reaction in this calorimeter, its temperature decreases to 27.45°C. If the calorimeter has a mass of 1.400 kg and a specific heat of 3.52 J/(gi°C), how much heat is absorbed by the reaction?Use .

Question illustration
A
140 J
B
418 J
C
1,470 J
D
5,170 J
47

Mercury(II) oxide (HgO) decomposes to form mercury (Hg) and oxygen (O2). The balanced chemical equation is shown below.2HgO 2Hg + O2The molar mass of O2 is 32.00 g/mol. How many moles of HgO are needed to produce 250.0 g of O2?

Question illustration
A
3.906 moles
B
7.813 moles
C
15.63 moles
D
73.87 moles
48

If the pressure, volume, and the number of moles of a gas are known, which is needed to calculate the universal gas constant from the ideal gas law?

A
the temperature of the gas
B
the molar volume of the gas
C
the molar mass of the gas
D
the partial pressure of the gas
49

A sample of hexane (C6H14) has a mass of 0.580 g. The sample is burned in a bomb calorimeter that has a mass of 1.900 kg and a specific heat of 3.21 J/giK. What amount of heat is produced during the combustion of hexane if the temperature of the calorimeter increases by 4.542 K?Use .

Question illustration
A
8.46 kJ
B
16.1 kJ
C
27.7 kJ
D
47.8 kJ
50

Consider the reaction below.2Al2O3 4Al + 3O2How many moles of oxygen are produced when 26.5 mol of aluminum oxide are decomposed?

Question illustration
A
17.7 mol
B
19.9 mol
C
39.8 mol
D
53.0 mol

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