AnswersNY-Chemistry Term 1 HillcrestCumulative Exam

Cumulative Exam — Cumulative exam Answers

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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
22
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The boiling points of different substances are given in the table below.SubstanceBoiling point (°C)Acetic acid118.1Benzene80.2Chloroform61.2Water100.0Which substance most likely has the strongest intermolecular forces?

A
acetic acid
B
benzene
C
chloroform
D
water
23

Consider the diagram.Which postulate of the kinetic-molecular theory best describes the event in the diagram?

Question illustration
A
Most of the volume of a gas is empty space.
B
All collisions between particles are perfectly elastic.
C
There is no force of attraction or repulsion between gas particles.
D
The average kinetic energy of particles depends only on temperature.
24

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.
25

The volume of a fixed amount of gas is doubled, and the absolute temperature is doubled. According to the ideal gas law, how has the pressure of the gas changed?

A
It has increased to two times its original value.
B
It has increased to four times its original value.
C
It has decreased to one-half its original value.
D
It has stayed the same.
26

Two students are given two different size blocks of the same substance and are instructed to determine the properties of the substance. Which statement describes a property that will be the same for both students?

A
length because it is an extensive property
B
mass because it is an extensive property
C
boiling point because it is an intensive property
D
volume because it is an intensive property
27

Which of the following is an oxidation-reduction reaction?

A
SO2(g) + H2O(l) H2SO3(aq)
Option A
B
CaCO3(s) CaO(s) + CO2(g)
Option B
C
Ca(OH)2(s) + H2CO3(l) CaCO3(aq) + 2H2O(l)
Option C
D
C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(l)
Option D
28

The following half-reaction method is used to balance oxidation-reduction equations.(1) Determine which atoms change oxidation state from reactant to product in the reaction.(2) Identify and write half reactions (oxidation and reduction).(3) Return to the original chemical equation to balance it.(a) Insert the coefficients from the half reactions first.(b) Inspect the number of each atom on each side for all elements.Which important step is missing from this procedure?

A
Check other reactions similar to this one.
B
Name the elements that are involved in the reaction.
C
Make sure the reduction half reaction is identified first.
D
Balance the half reactions based on the number of electrons.
29

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
30

Which compound contains both sigma and pi bonds?

A
HCCl3
B
H2CO
C
H2S
D
HBr
31

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.
32

What is the percent by mass of magnesium sulfate in MgSO4 · 7H2O?Use .

Question illustration
A
12.04%
B
48.83%
C
51.17%
D
86.98%
33

Which can be categorized as a use of plasma in technology?

A
taking pictures of solar flares
B
observing the aurora borealis
C
making fluorescent lights for houses
D
making telescopes to observe distant stars
34

The table below gives the numbers of protons, electrons, and neutrons in four atoms.AtomNumber of protonsNumber of electronsNumber of neutrons1393952240405033939544404051Based on the information that is given, which atom in the table has the highest mass?

A
1
B
2
C
3
D
4
35

Which statement best compares the energy involved in melting with the energy involved in boiling for a given liquid?

A
Energy is removed from the particles in each change, but more energy is removed in melting than in boiling because the attractions are weaker.
B
Energy is removed from the particles in each change, but more energy is removed in boiling than in melting because the attractions are weaker.
C
Energy is added to the particles in each change, but boiling requires more energy than melting because the attractions must be completely overcome.
D
Energy is added to the particles in each change, but melting requires more energy than boiling because the attractions must be completely overcome.
36

An element has five valence electrons available for bonding. This element is most likely which of the following?

A
boron
B
phosphorus
C
tin
D
tellurium
37

Consider the balanced equation. PCl3 + 3H2O H3PO3 + 3HCl What is the percent yield of HCl if 42.0 g of HCl are produced from the reaction of 62.0 g of PCl3?Use .

Question illustration
A
28.4%
B
72.8%
C
85.0%
D
93.5%
38

The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO).2Mg + O2 2MgOThe molar mass of O2 is 32.0 g/mol. What mass, in grams, of O2 is required to react completely with 4.00 mol of Mg?

Question illustration
A
2.00 grams
B
64.0 grams
C
128 grams
D
256 grams
39

Consider the redox reaction below.Which statement correctly describes a half-reaction that is taking place?

Question illustration
A
Hydrogen is oxidized from +1 to 0.
B
Chlorine is reduced from –1 to 0.
C
Aluminum is oxidized from 0 to +3.
D
Hydrogen is reduced from 0 to –1.
40

Which statement best explains why different gases effuse at different rates?

A
At a given pressure, gas particles with smaller masses move faster.
B
At a given pressure, gas particles with smaller masses move slower.
C
At a given temperature, gas particles with smaller masses move faster.
D
At a given temperature, gas particles with smaller masses move slower.

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