AnswersCR03101 ChemistryCumulative Exam

Cumulative Exam — Cumulative exam Answers

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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
2
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A miner develops cancer of the esophagus. Ten years before, he had been exposed to radiation when he worked for a year in a mine. He had also smoked cigarettes for a number of years, but had quit five years ago. Which statement best describes the miner’s condition?

A
Tests can determine whether the cancer was caused by exposure at the mine or by compounds in cigarette smoke so that a treatment can be determined.
B
Cancer caused by exposure at the mine would have appeared while he was at the mine, so smoking is the more likely cause.
C
The cancer is likely the result of natural exposure to radiation in the environment and not related to either the mine or smoking.
D
It is unlikely that a specific cause can be determined, but the treatment would likely be the same in either case.
3

Two cups of coffee, one that is at 10°C and one that is at 20°C, are mixed. Which statement about the temperature of the mixture is correct?

A
There is no kinetic energy transfer so the temperature of the coffee in the warmer cup is the final temperature.
B
The kinetic theory dictates that the temperature of the coffee in the cooler cup is the final temperature.
C
Energy is transferred from faster moving molecules to slower moving molecules, and the result is the average of 15°C.
D
Energy transfer occurs as the molecules collide, and the result is additive; the final temperature is 30°C.
4

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.
5

Consider the following reversible reaction.What is the equilibrium constant expression for the given system?

Question illustration
A
mc031-2.jpg
Option A
B
K subscript e q equals StartFraction StartBracket upper C upper O subscript 2 EndBracket over StartBracket upper O subscript 2 EndBracket EndFraction.
Option B
C
K subscript e q equals StartFraction StartBracket upper C EndBracket StartBracket upper O subscript 2 EndBracket over StartBracket upper C upper O subscript 2 EndBracket EndFraction.
Option C
D
K subscript e q equals StartFraction StartBracket upper O subscript 2 EndBracket over StartBracket upper C upper O subscript 2 EndBracket EndFraction.
Option D
6

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
7

Ladybugs eat aphids on plants. Ajoy counts the number of ladybugs in one square meter of his garden. To estimate the number of ladybugs in the entire garden, Ajoy needs the

A
dimensions of the garden.
B
ladybug life span.
C
number of plants in the garden.
D
dimensions of a single ladybug.
8

A radioactive nuclide that is used for geological dating has an atomic number of 19 and mass number 40. Which is the symbol of this nuclide?

A
Superscript 19 subscript 21 upper K.
Option A
B
Superscript 21 subscript 19 upper K.
Option B
C
Superscript 40 subscript 19 upper K.
Option C
D
Superscript 19 subscript 40 upper K.
Option D
9

Kumar is producing the photoelectric effect by using red light. He wants to increase the energy of emitted electrons. Based on the research of Albert Einstein, what is the best way for him to do this?

A
Increase the intensity of red light.
B
Decrease the intensity of red light.
C
Use a different colored light that has a higher frequency.
D
Use a different colored light that has a lower frequency.
10

Which task most likely involves a calculation that uses moles?

A
measuring a sugar sample on a balance
B
counting the number of jellybeans in a jar
C
determining the number of atoms in a jar of liquid
D
finding the rate of expansion of a gas-filled balloon
11

Molecules in all organisms are composed in part of radioactive carbon-14. Which statement best explains the presence of carbon-14 in organisms?

A
The radioactive isotope reacts in the same way as stable isotopes in the nuclear reactions in the body.
B
The radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body.
C
The radioactive isotope reacts faster than stable isotopes in the nuclear reactions in the body.
D
The radioactive isotope reacts faster than stable isotopes in the chemical reactions in the body.
12

A supervisor spends a day inspecting a nuclear plant for potential radiation leaks. She has to move throughout the plant inspecting all the equipment and machinery. She needs to take two different radiation detection devices to help ensure her safety and to find radiation leaks. She needs the results immediately. Which two devices would be the best choices for the task?

A
Geiger counter and scintillation counter
B
Geiger counter and cloud chamber
C
cloud chamber and scintillation counter
D
film badge and scintillation counter
13

The table describes solids and plasmas.Which statement can be placed in the blank cell to make the information in the table accurate?

Question illustration
A
can be crystalline
B
can be amorphous
C
are made of charged particles
D
are made of neutral particles
14

A sample of an unknown substance has a mass of 0.158 kg. If 2,510.0 J of heat is required to heat the substance from 32.0°C to 61.0°C, what is the specific heat of the substance?Use .

Question illustration
A
0.171 J/(gi°C)
B
0.548 J/(gi°C)
C
15.9 J/(gi°C)
D
86.6 J/(gi°C)
15

Which answer choice represents a balanced alpha emission nuclear equation?

A
Superscript 52 subscript 26 upper F e right arrow superscript 52 subscript 25 upper M n plus superscript o subscript plus 1 e.
Option A
B
Superscript 235 subscript 92 upper U right arrow superscript 239 subscript 94 upper P u s plus superscript 4 subscript 2 upper H e.
Option B
C
Superscript 189 subscript 83 upper Bi right arrow superscript 185 subscript 81 upper T l plus superscript 4 subscript 2 H e.
Option C
D
Superscript 14 subscript 6 upper C right arrow superscript 14 subscript 7 upper N plus superscript 0 subscript negative 1 e.
Option D
16

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
17

In which orbitals would the valence electrons for carbon (C) be placed?

A
s orbital and d orbitals
B
s orbital only
C
p orbitals only
D
s orbital and p orbitals
18

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

A
a noble gas
B
a halogen
C
a metalloid
D
a metal
19

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
20

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.

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