Answers2026-2027_MDCPS_2003345_Chemistry_1_B-CRLab: Measuring pH

Lab: Measuring pH — Cumulative exam Answers

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Two different gases are stored in separate closed containers. If both gases have a temperature of 50°C, which statement is true?

A
The thermal energies of gas molecules in the two containers are unrelated.
B
The gas molecules in both containers will absorb heat from the surroundings.
C
The molecules in one gas will transfer energy to the molecules in the other gas.
D
The gas molecules in both containers have the same average kinetic energy.
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Which scientist established the law of octaves?

A
Antoine Lavoisier
B
Dmitri Mendeleev
C
Henry Moseley
D
John Newlands
43

What is the definition of a Lewis acid?

A
a substance that accepts electrons to form a covalent bond
B
a substance that donates electrons to form a covalent bond
C
a substance that accepts a proton
D
a substance that donates a proton
44

The table lists the lattice energies of some compounds.CompoundLattice Energy (kJ/mol)LiF –1,036LiCl –853NaF –923KF –821NaCl –786Which statement about crystal lattice energy is best supported by the information in the table?

A
The lattice energy increases as cations get smaller, as shown by LiF and KF.
B
The lattice energy increases as the cations get larger, as shown by LiF and LiCl.
C
The lattice energy decreases as cations get smaller, as shown by NaCl and NaF.
D
The lattice energy decreases as the cations get smaller, as shown by NaF and KF.
45

The reaction below demonstrates which characteristic of a base?

Question illustration
A
the ability of bases to release sodium ions into solution
B
the ability of bases to release hydrogen ions into solution
C
the ability of a base to react with carbonate or bicarbonate
D
the ability of a base to react with a soluble metal salt
46

Which statement is true about ionic compounds?

A
They are made up of many large molecules that are bonded together.
B
They are made up of atoms of only one type of element.
C
They are made up of particles that are arranged in a repeating pattern.
D
They are made up of a random ratio of elements that are bonded together.
47

Which of the following can easily form an ionic bond with a cation?

A
Sr
B
Ne
C
NH4+
D
PO43–
48

How can the pH of a solution be calculated if the pOH is known?

A
by taking the negative logarithm of pOH
B
by adding the pOH to 14
C
by raising 10 to the power of –pOH
D
by subtracting the pOH from 14
49

Which element is classified as a noble gas?

A
O
B
N
C
Cl
D
Xe
50

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

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