AnswersChemistry - SC3210 A-CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

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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
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Consider the energy diagram below.Which statement best describes the diagram?

Question illustration
A
The pathway A-B-D involves a catalyst and is slower than A-C-D.
B
The pathway A-B-D involves a catalyst and is faster than A-C-D.
C
The pathway A-C-D involves a catalyst and is slower than A-B-D.
D
The pathway A-C-D involves a catalyst and is faster than A-B-D.
23

The following reaction occurs in a car’s catalytic converter.2NO(g) + 2CO(g) N2(g) + 2CO2(g) Which answer best describes the reducing and oxidizing processes in this reaction?

Question illustration
A
NO and CO are both reducing agents.
B
NO and CO are both oxidizing agents.
C
The oxidation state of nitrogen in NO changes from +2 to 0, and the oxidation state of carbon in CO changes from +2 to +4 as the reaction proceeds.
D
The oxidation state of nitrogen in NO changes from 0 to +2, and the oxidation state of carbon in CO changes from +4 to +2 as the reaction proceeds.
24

Which statement is true about crystal lattice energy?

A
It increases as the size of the ions increases.
B
It increases as the charge on the ions decreases.
C
It is the energy that ions absorb when they form a crystal.
D
It is a measure of the strength of the bonds between ions.
25

A teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. Which would be the best demonstration that she could use?

A
bending a piece of aluminum
B
breaking a matchstick
C
dissolving sugar in water
D
burning a candle
26

Consider the unbalanced equation for the oxidation of aluminum._Al + _O2 _Al2O3Which sequence of coefficients should be placed in the blanks to balance this equation?

Question illustration
A
2, 3, 1
B
1, 3, 2
C
4, 3, 2
D
3, 2, 3
27

The image shows what happens when an antacid tablet is placed in water.The process shown in the image can best be described as a

Question illustration
A
rapid chemical reaction where gas is released.
B
slow chemical reaction where light is being given off.
C
slow chemical reaction where the liquid changes color.
D
rapid chemical reaction where heat is suddenly released.
28

Which best describes the function of a centrifuge?

A
to separate the solute from the solvent
B
to separate the dissolved part of a solution into layers
C
to separate a mixture by heating it for a long period of time
D
to separate the undissolved particles of a mixture into layers
29

Which is true of transition metals when moving from left to right on the periodic table?

A
The d sublevels are not filled across the period.
B
The cation radii become larger across the period.
C
Atomic radii increase slightly and then start to decrease.
D
Atomic radii decrease slightly and then start to increase.
30

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.
31

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.
32

Which element is likely to have a high thermal conductivity?

A
antimony
B
carbon
C
chlorine
D
sodium
33

Which is the formula for diarsenic pentoxide?

A
Ar2O5
B
As5O2
C
As2O5
D
2As5O
34

Which statement explains how the bands in the crystal of a metal are like atomic orbitals?

A
They both have localized electrons that orbit specific atoms.
B
They both involve ionization of some atoms so bonding can occur.
C
They both have localized electrons that move from atom to atom.
D
They both allow electrons to move from lower energy levels to higher energy levels.
35

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

A
a noble gas
B
a halogen
C
a metalloid
D
a metal
36

The periodic table below shows the electronegativity values of some elements.ElectronegativitiesConsider the positions of barium (Ba), sulfur (S), silicon (Si), and calcium (Ca) on the periodic table. The atoms of which element require the least amount of energy to give up an electron when forming chemical bonds?

Question illustration
A
barium
B
sulfur
C
silicon
D
calcium
37

A single atom of an element has 21 neutrons, 20 electrons, and 20 protons. Which element is it?

A
K
B
Zr
C
Ca
D
Sc
38

In an experiment, a student wants to increase the rate of a reaction that involves gases. Which change to the reactants would accomplish this?

A
Increase the volume to decrease pressure and to increase concentration.
B
Increase the volume to increase pressure and to decrease concentration.
C
Decrease the volume to decrease pressure and to increase concentration.
D
Decrease the volume to increase pressure and to increase concentration.
39

Which compound contains both sigma and pi bonds?

A
HCCl3
B
H2CO
C
H2S
D
HBr
40

According to the collision theory, which is required for a high number of effective collisions?

A
a very low amount of force from colliding molecules
B
a very low amount of kinetic energy from colliding molecules
C
molecular collisions that have very specific orientations
D
molecular collisions with energy to overcome activation energy

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