Answers2026-2027_MDCPS_2003345_Chemistry_1_B-CRLab: Measuring pH

Lab: Measuring pH — Cumulative exam Answers

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21
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Ca(OH)2 is added to a large beaker of water. How is the solution different from the original water?

A
The solution turns blue litmus to red.
B
The solution turns phenolphthalein pink.
C
The solution has more hydrogen ions.
D
The solution has fewer hydroxide ions.
22
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Pure water at 25°C

A
ionizes in the presence of acid to form an equilibrium in which
Option A
B
ionizes in the presence of acid to form an equilibrium in which
Option B
C
self-ionizes to form an equilibrium in which
Option C
D
self-ionizes to form an equilibrium in which
Option D
23

Which element would most likely have chemical properties similar to that of fluorine (F)?

A
Ne
B
N
C
Li
D
Br
24

What is the element Ar classified as in the periodic table?

A
a noble gas
B
a halogen
C
a metalloid
D
a metal
25

Which best describes a compound such as magnesium oxide?

A
an impure substance that is made up of two elements
B
a mixture of two uncommon substances
C
a mixture of two common elements
D
a pure substance that is made up of different elements
26

The pOH of a solution is 6.0. Which statement is correct?Use and .

Question illustration
A
The pH of the solution is 20.0.
B
The concentration of OH– ions is .
Option B
C
The concentration of OH– ions is .
Option C
D
The pH of the solution is 8.0.
27

What is a common use of bases?

A
as a component of vinegar
B
as a component of car batteries
C
to make foods tart
D
to reduce indigestion
28

The main component of smog is . Smog is a product that is formed through the following series of intermediate chemical reactions.What is the overall chemical equation for smog after the above intermediate reactions are combined?

Question illustration
A
Upper N subscript 2 (g) plus 3 upper O subscript 2 (g) plus 2 upper O subscript 3 (g) plus 2 upper O (g) right arrow 8 upper N upper O (g) plus 4 upper N upper 0 subscript 2 (g) plus 2 upper O subscript 3 (g).
Option A
B
Upper N subscript 2 (g) plus 3 upper O subscript 2 (g) plus upper O subscript 3 (g) plus upper O (g) right arrow 9 upper N upper O (g) plus 3 upper N upper 0 subscript 2 (g) plus 2 upper O subscript 3 (g).
Option B
C
Upper N subscript 2 (g) plus 3 upper O subscript 2 (g) right arrow 3 upper N upper O subscript 2 (g).
Option C
D
Upper N subscript 2 (g) plus 2 upper O subscript 2 (g) right arrow 2 upper N upper O subscript 2 (g).
Option D
29

A sample of propane (C3H8) has a mass of 0.47 g. The sample is burned in a bomb calorimeter that has a mass of 1.350 kg and a specific heat of 5.82 J/(g • °C). How much energy is released by the reaction if the temperature of the calorimeter rises by 2.87°C?Use .

Question illustration
A
7.85 kJ
B
10.6 kJ
C
22.5 kJ
D
47.9 kJ
30

The enthalpy of formation of water is –285.8 kJ/mol. What can be inferred from this statement?

A
The enthalpy of the products is equal to the enthalpy of the reactants.
B
Heat is absorbed during the process.
C
Heat is released during the process.
D
The enthalpy of the products is more than the enthalpy of the reactants.
31

How does heat differ from temperature?

A
Temperature is the measure of heat.
B
Temperature and heat are the same thing.
C
Temperature measures thermal energy, and heat is the flow of thermal energy.
D
Temperature measures the loss of energy, and heat measures the gain of energy.
32

A sample of an unknown substance has a mass of 0.158 kg. If 2,510.0 J of heat is required to heat the substance from 32.0°C to 61.0°C, what is the specific heat of the substance?Use .

Question illustration
A
0.171 J/(gi°C)
B
0.548 J/(gi°C)
C
15.9 J/(gi°C)
D
86.6 J/(gi°C)
33

During photosynthesis, sunlight shining on a plant is absorbed. Through several chemical reactions, the plant produces sugar, a high-energy compound, from simpler substances. What energy transformation occurs during this process?

A
thermal energy to chemical energy
B
electromagnetic energy to chemical energy
C
kinetic energy to potential energy
D
potential energy to chemical energy
34

What is the equilibrium constant of pure water at 25°C?

A
1014
B
10–14
C
10–7
D
107
35

Ethyne (C2 H2 (g), Hf = 226.77 kJ/mol) undergoes complete combustion in the presence of oxygen to produce carbon dioxide (CO2 (g), Hf = –393.5 kJ/mol ) and water (H2 O(g), Hf = –241.82 kJ/mol) according to the equation below.What is the enthalpy of combustion (per mole) of C2 H2 (g)? Use .

Question illustration
A
–2511.2 kJ/mol
B
–1255.6 kJ/mol
C
–862.1 kJ/mol
D
–431.0 kJ/mol
36

Selected properties of antimony (Sb) and iodine (I) are listed in the table below.ElementAtomic radius(pm)First ionization energy(kJ/mol)Electron affinity(kJ/mol)ElectronegativitySb145?–1032.05I1401008–295?Which predictions can most likely be made?

A
Sb has a lower ionization energy but a higher electronegativity than I.
B
Sb has a higher ionization energy but a lower electronegativity than I.
C
Sb has a lower ionization energy and a lower electronegativity than I.
D
Sb has a higher ionization energy and a higher electronegativity than I.
37

Which element would most likely have an electron affinity measuring closest to zero?

A
Na
B
Al
C
Rb
D
Ar
38

Which refers to the amount of a solute that will dissolve in a given volume of solvent at a given temperature and pressure?

A
solubility
B
supersaturated
C
dissolution rate
D
concentrated
39

Which units express specific heat capacity?

A
J/°C, J/K, cal/°C, cal/K
B
J/(gi°C), J/(giK), cal/(gi°C), cal/(giK)
C
J, cal
D
°C, K
40

Sulfur reacts with oxygen to form sulfur dioxide (SO2(g), Hf = –296.8 kJ/mol) according to the equation below.What is the enthalpy change for the reaction? Use .

Question illustration
A
–593.6 kJ
B
–296.8 kJ
C
296.8 kJ
D
593.6 kJ

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