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

Writing and Balancing Chemical Equations — Cumulative exam Answers

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1
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Which compound contains both sigma and pi bonds?

A
HCCl3
B
H2CO
C
H2S
D
HBr
2
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Which element would most likely have chemical properties similar to that of fluorine (F)?

A
Ne
B
N
C
Li
D
Br
3

An electron in a hydrogen atom moves from level 1 to level 4. The electron then drops from level 4 to level 2. Which statement describes the most likely result?

A
The energy absorbed in the first move equals the energy released in the second move.
B
The energy absorbed in the first move is greater than the energy released in the second move.
C
The energy released in the first move equals the energy absorbed in the second move.
D
The energy released in the first move is greater than the energy absorbed in the second move.
4

When chemists convert ethene (C2H2) to ethanol (CH3CH2OH), they have a mixture of the two gaseous substances. Why do chemists then lower the temperature of the mixture?

A
to collect liquid ethene and leave ethanol as a gas because ethene has stronger dipole-dipole forces
B
to collect liquid ethene and leave ethanol as a gas because ethanol has stronger London dispersion forces
C
to collect liquid ethanol and leave ethene as a gas because ethanol has hydrogen bonds
D
to collect liquid ethanol and leave ethene as a gas because ethene has stronger London dispersion forces
5

A scientist wants to perform a controlled experiment to test the effect of rust on chemically treated iron. Which action would be most important to perform in a controlled experiment?

A
Design an experiment that is based on previously published results.
B
Expose the treated iron to the corrosive effects of the air.
C
Test a large piece of treated iron and a small piece of untreated iron.
D
Test a piece of treated iron and a piece of untreated iron under the same conditions.
6

In an investigation that uses the scientific method, which step immediately follows making a hypothesis?

A
summarizing the results
B
asking a question
C
making observations
D
designing an experiment
7

Francine makes several measurements of the mass of a metal block. The data set is shown in the table below.MeasurementMass of metal block (g)120.73220.76320.68420.75After analyzing this data set, Francine calculates a value of 20.73 g. Which of these characteristics has been calculated?

A
mean
B
median
C
mode
D
range
8

Which is the formula for diarsenic pentoxide?

A
Ar2O5
B
As5O2
C
As2O5
D
2As5O
9

Consider the word equation.calcium hydroxide + hydrochloric acid calcium chloride + waterWhich is the corresponding formula equation?

Question illustration
A
Upper C a upper C l subscript 2 right arrow upper C a (s) plus upper C l subscript 2 (g).
Option A
B
Upper C a upper O (s) plus upper H subscript 2 upper O (l) right arrow upper C a (upper O upper H) subscript 2 (a q).
Option B
C
Upper N a upper O upper H (a q) plus 2 upper H upper C l (a q) right arrow upper N a upper C l (a q) plus 2 upper H subscript 2 upper O (l).
Option C
D
Upper C a (upper O H) subscript 2 (s) plus 2 upper H upper C l (l) right arrow upper C a upper C l subscript 2 (a q) plus 2 upper H subscript 2 upper O (l).
Option D
10

In an investigation with density, Marcia’s teacher measures the mass and volume of 10 different samples of a substance. The samples are numbered 1 through 10. Then, the teacher makes the graph that is shown below.What is the independent variable in this investigation?

Question illustration
A
mass
B
volume
C
sample number
D
substance density
11

The properties of two elements are listed below.ElementAtomic radius(pm)Ionic radius(pm)First ionization energy(kJ/mol)Electron affinity(kJ/mol)ElectronegativityBr1141951140–3253.0K243152.2418.8–48.40.82Which prediction is supported by the information in the table?

A
K will give up an electron more easily than Br.
B
Both K and Br will have the same pull on electrons.
C
K will have a smaller size in comparison to Br.
D
Both K and Br will produce ions of the same size.
12

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

A
a noble gas
B
a halogen
C
a metalloid
D
a metal
13

Derek needs a tool that delivers 5.00 mL of a sodium hydroxide solution. Which tool would be best for him to use?

A
a beaker
B
a pipette
C
a graduated cylinder
D
an Erlenmeyer flask
14

Sodium chloride is made up of clear, colorless crystals. A solution of sodium chloride in water is a good conductor of electricity. Which statement describes sodium chloride?

A
It is made up of ions that are held together by ionic bonds.
B
It is made up of atoms that are held together by metallic bonds.
C
It is made up of atoms that are held together by covalent bonds with equal sharing of electrons.
D
It is made up of atoms that are held together by covalent bonds with unequal sharing of electrons.
15

Rebekah finds that a solution of sugar in water has a volume of 1.32 fl. oz. How should she report this amount using the metric system? (1 fl. oz. = 29.6 mL)

A
0.403 m
B
1.40 qt
C
37.5 g
D
39.1 mL
16

How many hybrid orbitals are found in CCl4?

A
one
B
two
C
three
D
four
17

Which is a component of John Dalton’s atomic theory?

A
The ratio of atoms in a compound is fixed.
B
The atoms of different elements are the same.
C
An atom is a small particle of matter that can be broken down.
D
A reaction can create or destroy atoms as well as rearrange them.
18

Which method for treating arthritis is an example of pseudoscience?

A
diet
B
drugs
C
exercise
D
magnets
19

What is the chemical formula for iron(II) hydroxide?

A
FeOH
Option A
B
Fe(OH)
Option B
C
FeOH
Option C
D
FeOH
20

In the molecules below, areas that have a partial negative charge are pink and areas that have a partial positive charge are blue. The attractive force between these two molecules has most likely been produced by

Question illustration
A
covalent bonds.
B
dipole-dipole interactions.
C
dipole-induced dipole interactions.
D
London dispersion forces.

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