Question 1

Which list includes three forms of energy?

Accepted Answer

thermal, chemical, electromagnetic

Answer

temperature, chemical, electronegativity

Answer

thermal, nuclear, electronegativity

Answer

temperature, nuclear, electromagnetic

Question 2

A cube of iron at $20. ^{\circ}	ext{C}$ is placed in contact with
a cube of copper at $60. ^{\circ}	ext{C}$ . Which statement
describes the initial flow of heat between the
cubes?

Accepted Answer

Heat flows from the copper cube to the iron
cube.

Answer

Heat flows in both directions between the
cubes.

Answer

Heat flows from the iron cube to the copper
cube.

Answer

Heat does not flow between the cubes.

Question 3

Dating once-living organisms is an example of
a beneficial use of

Accepted Answer

radioactive isotopes

Answer

neutralization reactions

Answer

redox reactions

Answer

organic isomers

Question 4

What is the amount of heat, in joules, required
to increase the temperature of a $	ext{49.5-gram}$
sample of water from  $22 ^{\circ}	ext{C}$  to $66 ^{\circ}	ext{C}?$

Accepted Answer

$9.1 	imes 10^3	ext {J}$

Answer

$1.4 	imes 10^4	ext {J}$

Answer

$4.6 	imes 10^3	ext {J}$

Answer

$2.2 	imes 10^3	ext {J}$

Question 5

Given the equation representing a reaction:

$\begin{matrix}\footnotesize208\\footnotesize82\end{matrix}{
ormalsize 	ext {Pb}}+\begin{matrix}\footnotesize70\\footnotesize30\end{matrix}{
ormalsize 	ext {Zn}}ightarrow\begin{matrix}\footnotesize277\\footnotesize112\end{matrix}{
ormalsize 	ext {Cn}}+ \begin{matrix}\footnotesize1\\footnotesize0\end{matrix}{
ormalsize 	ext  {n}}$

Which type of reaction is represented by this
equation?

Accepted Answer

transmutation

Answer

neutralization

Answer

polymerization

Answer

substitution

Question 6

Which form of energy is transferred when an ice
cube at $0^{\circ}	ext{C}$ is placed in a beaker of water at
$50^{\circ}	ext{C}?$

Accepted Answer

thermal

Answer

electrical

Answer

nuclear

Answer

chemical

Question 7

The average kinetic energy of the particles in a
sample of matter is expressed as

Accepted Answer

temperature

Answer

volume

Answer

density

Answer

pressure

Question 8

Given the equation:
$	ext{I}_2(	ext{s}) ightarrow	ext{I}_2(	ext{g})$
Which phrase describes this change?

Accepted Answer

endothermic physical change

Answer

exothermic chemical change

Answer

endothermic chemical change

Answer

exothermic physical change

Question 9

Which phrase describes a risk of using the
radioisotope $	ext{Co}-60$ in treating cancer?

Accepted Answer

increased biological exposure

Answer

increased ozone depletion

Answer

production of greenhouse gases

Answer

production of acid rain

Question 10

Which numerical setup can be used to calculate
the heat energy required to completely melt
$	ext100. \,	ext {grams}$ of $	ext H_2	ext O(	ext s)$ at $0^{\circ }	ext C?

Accepted Answer

$(100.\, 	ext g)(334\,	ext  J/	ext g)$

Answer

$(100.\, 	ext g)(4.18\,	ext  {J/g}{\bullet	ext K})(	ext O^\circ 	ext C)$

Answer

$(100.\, 	ext g)(2260\,	ext  J/	ext g)$

Answer

$(100.\, 	ext g)(4.18\,	ext  {J/g}{\bullet	ext K})(273\,	ext K)$

Question 11

Given the equation:

$\begin{matrix}\footnotesize235\\footnotesize92\end{matrix}{
ormalsize 	ext {U}}+\begin{matrix}\footnotesize1\\footnotesize0\end{matrix}{
ormalsize 	ext {n}}ightarrow\begin{matrix}\footnotesize140\\footnotesize56\end{matrix}{
ormalsize 	ext {Ba}}+ \begin{matrix}\footnotesize93\\footnotesize36\end{matrix}{
ormalsize 	ext  {Kr}}+3\begin{matrix}\footnotesize1\\footnotesize0\end{matrix}
ormalsize	ext{n}+
ormalsize	ext{energy}$

Which type of nuclear reaction is represented
by the equation?

Accepted Answer

fission

Answer

fusion

Answer

beta decay

Answer

alpha decay

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