Answers2026-2027_MDCPS_2003345_Chemistry_1_B-CRLab: Measuring pH

Lab: Measuring pH — Unit test Answers

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Which statement accurately describes part of the dissolving process of a polar solute in water?

A
Solute molecules repel water molecules.
B
Water molecules surround solute molecules.
C
Water molecules are strongly attracted to nonpolar substances.
D
Solute molecules remain concentrated in one part of the solvent.
2
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What is the Arrhenius definition of a base?

A
A substance that increases H3O+ concentration when it is dissolved in water.
B
A substance that increases OH– concentration when it is dissolved in water.
C
A compound that donates protons.
D
A compound that accepts protons.
3

Which of these equations correctly expresses the self-ionization of water?

A
Upper H subscript 2 upper O superscript plus upper H subscript 3 upper O superscript plus double-headed arrow upper H subscript 2 upper O plus upper O upper H superscript minus.
Option A
B
Upper H subscript 2 upper O plus upper H subscript 2 upper O double-headed arrow 2 upper O upper H superscript minus.
Option B
C
Upper H subscript 2 upper o plus upper H subscript 2 upper O double headed arrow 2 upper H subscript 3 upper O superscript plus.
Option C
D
Upper H subscript 2 upper O plus upper H subscript 2 upper O double-headed arrow upper H subscript 3 upper O superscript plus, plus upper O upper H superscript minus.
Option D
4

Which of these factors will cause a solid solute to dissolve faster?

A
increasing the air temperature
B
increasing the amount of solute
C
increasing the amount of solvent
D
increasing the surface area of solute
5

The pH of lemon juice at 298 K is found to be 2.32. What is the concentration of ions in the solution? Use .

Question illustration
A
1.05 times 10 to the negative 3 moles per liter.
Option A
B
4.79 times 10 to the negative 3 moles per liter.
Option B
C
2.09 times 10 squared moles per liter.
Option C
D
9.55 times 10 squared moles per liter.
Option D
6

A substance is dissolved in water and produces hydronium ions. This occurs when hydrogen ions move from the substance to associate with water molecules. Which term best matches the behavior of this substance?

A
Arrhenius base
B
Arrhenius acid
C
Bronsted-Lowry base
D
Bronsted-Lowry acid
7

Which characteristic best identifies an Arrhenius base?

A
It must donate electrons to form a covalent bond.
B
It must accept protons from an acid.
C
It must generate hydroxide ions in water.
D
It must form a conjugate acid after reacting.
8

An unknown substance turns methyl orange solution red. This shows that the substance

A
is a base.
B
is water.
C
is an acid.
D
is an alkaloid.
9

Several substances are labeled on the pH scale below.Which substance has the lowest [H+] concentration but is still considered an acid?

Question illustration
A
milk
B
blood
C
gastric fluid
D
household lye
10

The graph below shows how solubility changes with temperature.How many grams of NaCl will be needed to form 600 mL of a saturated solution at 100°C?

Question illustration
A
15 g
B
24 g
C
40 g
D
240 g
11

Brownian motion is not observed in a mixture that includes two phases. Which best identifies the mixture?

A
a colloid
B
a suspension
C
a solution
D
an alloy
12

A compound accepts electrons from another substance to form a covalent bond. Which term best describes this compound’s behavior?

A
Lewis acid
B
Arrhenius base
C
Bronsted-Lowry acid
D
Bronsted-Lowry base

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