Take 10
Week #15
SPS-4 Periodic Table
& SFS- 5 States of Matter
Day 1 Question 1
Which of the following changes of state
will increase the entropy of water
molecules?
Day 1 Question 2
Which of the following statements
explains what happens to the gas inside
a balloon as the external pressure on the
balloon decreases and the temperature
stays constant?
A. The volume increases.
B. The volume decreases.
C. The molecular speed increases.
D. The molecular speed decreases.
Day 1 Answers
1. Which of the following changes of state
will increase the entropy of water
molecules?
Which of the following statements explains
what happens to the gas inside a balloon as
the external pressure on the balloon
decreases and the temperature stays
constant?
A. The volume increases.
Day 2 Question 1
Formaldehyde in solution is used as a
preservative. It has a melting point of -92°C.
When the temperature of a sample of
formaldehyde rises from -93°C to -91°C,
which of the following occurs?
A. The molecules move more freely.
B. The molecules lose electrical charge.
C. The molecules break apart into atoms.
D. The molecules become fixed in a crystal
structure.
Day 2 Question 2
A hiker carries drinking water in a cloth-covered,
metal container called a canteen. During the
summer, the hiker wets the cloth covering so that
the water in the canteen stays cool.
Which of the following statements explains why a
wet covering keeps the water cool?
A. A wet covering transfers coolness to the water in
the canteen.
B. A wet covering insulates the canteen better than
a dry covering.
C. Evaporation of water from the covering transfers
heat away from the canteen.
D. Condensation of water from the covering
transfers heat away from the canteen.
Day 2 Answers
1. Formaldehyde in solution is used as a
preservative. It has a melting point of -92°C.
When the temperature of a sample of formaldehyde
rises from -93°C to -91°C, which of the following
occurs?
A. The molecules move more freely.
2. A hiker carries drinking water in a cloth-covered,
metal container called a canteen. During the
summer, the hiker wets the cloth covering so that
the water in the canteen stays cool.
Which of the following statements explains why a
wet covering keeps the water cool?
C. Evaporation of water from the covering transfers
heat away from the canteen.
Day 3 Question 1
The diagram below shows two gases maintained at
STP in separate chambers by a closed valve.
After the valve is opened, the two gases form a
homogeneous mixture. Which of the following
changes in the system results when forming this
mixture?
A. loss of heat
B. increase in entropy
C. chemical reaction of the gases
D. decrease in the total volume of the gases
Day 3 Question 2
Which of the following statements best
explains why water vapor condenses
as temperature decreases?
A. Collisions between water vapor
molecules become elastic.
B. Water vapor molecules chemically react
when they collide.
C. Water vapor molecules are pulled
together by the force of gravity.
D. Attractive forces between water vapor
molecules overcome molecular motion.
Day 3 Answers
1. After the valve is opened, the two gases
form a homogeneous mixture. Which of the
following changes in the system results
when forming this mixture?
B. increase in entropy
2. Which of the following statements best
explains why water vapor condenses
as temperature decreases?
D. Attractive forces between water vapor
molecules overcome molecular motion.
Day 4 Question 1
The figure shows part of the periodic
table.
Which of the following is an accurate
comparison of the atomic number
and mass of copper (Cu) and gold
(Au)?
A. Au has a smaller atomic mass and
fewer electrons than Cu.
B. Au has the same atomic mass as
Cu but a greater atomic number.
C. Au has the same atomic number as
Cu but a much greater atomic
mass.
D. Au has both a greater atomic
number and a greater atomic mass
than Cu.
Day 4 Question 2
Which of the following correctly
describes a trend from top to bottom
in the group 2 (2A) elements on the
periodic table?
A. Ionic radius decreases.
B. Ionic charge increases.
C. Atomic radius increases.
D. Atomic number decreases.
Day 4 Answers
1. Which of the following is an accurate
comparison of the atomic number and
mass of copper (Cu) and gold (Au)?
D. Au has both a greater atomic number
and a greater atomic mass than Cu.
2. Which of the following correctly
describes a trend from top to bottom in
the group 2 (2A) elements on the
periodic table?
C. Atomic radius increases.
Day 5 Question 1
The graph compares three states of a substance.
Which of the following choices is the best
label for the y-axis?
A. molecular density C. neutron density
B. molecular motion D. neutron motion
Day 5 Question 2
The illustration shows a hot-air
balloon. The pilot can change the
altitude of the hot-air balloon by
changing the temperature of the
gas inside the balloon. When the
gas is heated, the balloon rises.
Which of the following best
explains this phenomenon?
A. Heating the gas reduces its
pressure.
B. Heating the gas decreases its
density.
C. Heating the gas decreases its
molecular motion.
D. Heating the gas reduces the
frequency of the gas molecules’
collisions.
Day 5 Answers
1. Which of the following choices is the
best label for the y-axis?
B. molecular motion
2. Which of the following best
explains this phenomenon?
B. Heating the gas decreases
its density.