Based on the Law of Conservation of Energy, which of the below is true?(1 point)
Responses
Energy cannot be created or destroyed by ordinary chemical or physical means.
Energy cannot be created or destroyed by ordinary chemical or physical means.
Kinetic energy is equal to potential energy minus temperature.
Kinetic energy is equal to potential energy minus temperature.
Kinetic energy is always equal to potential energy.
Kinetic energy is always equal to potential energy.
Potential energy is equal to thermal energy plus kinetic energy.
Energy cannot be created or destroyed by ordinary chemical or physical means.
When thermal energy is removed from particles, what action occurs?(1 point)
Responses
The particles’ energy is destroyed.
The particles’ energy is destroyed.
The particles move more quickly.
The particles move more quickly.
The particles’ temperature increases.
The particles’ temperature increases.
The particles’ kinetic energy decreases.
The particles’ kinetic energy decreases.
The particles’ kinetic energy decreases.
In which example do the particles in water have the most kinetic energy?(1 point)
Responses
a glass of refrigerated water
a glass of refrigerated water
a cube of ice
a cube of ice
steam rising from a kettle
steam rising from a kettle
a heated swimming pool
steam rising from a kettle
Which option defines kinetic energy?(1 point)
Responses
the average energy of particles due to motion
the average energy of particles due to motion
the energy required to change a gas into a liquid
the energy required to change a gas into a liquid
the average energy released when a liquid becomes a solid
the average energy released when a liquid becomes a solid
the energy an object has because of its motion
the energy an object has because of its motion
the energy an object has because of its motion
Which list correctly orders the states of matter from least to most kinetic energy?(1 point)
Responses
liquid, solid, gas
liquid, solid, gas
gas, liquid, solid
gas, liquid, solid
solid, liquid, gas
solid, liquid, gas
liquid, gas, solid
solid, liquid, gas
Which statement correctly describes the relationship between the volume of a gas and its temperature, in Kelvin, assuming pressure is held constant?(1 point)
Responses
The relationship is inversely proportional; as temperature increases, volume increases in the same way.
The relationship is inversely proportional; as temperature increases, volume increases in the same way.
The relationship is directly proportional; as temperature increases, volume decreases in the same way.
The relationship is directly proportional; as temperature increases, volume decreases in the same way.
The relationship is directly proportional; as temperature increases, volume increases in the same way.
The relationship is directly proportional; as temperature increases, volume increases in the same way.
The relationship is inversely proportional; as temperature increases, volume decreases in the same way.
The relationship is directly proportional; as temperature increases, volume increases in the same way.
Which statement explains the molecular changes that occur in an enclosed gas as the pressure increases and the temperature is held constant?(1 point)
Responses
An increase in pressure causes particles to move farther apart, decreasing the volume.
An increase in pressure causes particles to move farther apart, decreasing the volume.
An increase in pressure causes particles to move farther apart, increasing the volume.
An increase in pressure causes particles to move farther apart, increasing the volume.
An increase in pressure causes particles to move closer together, increasing the volume.
An increase in pressure causes particles to move closer together, increasing the volume.
An increase in pressure causes particles to move closer together, decreasing the volume.
An increase in pressure causes particles to move closer together, decreasing the volume.
The ideal gas law is represented by PV=nRT
. As volume is held constant and the temperature increases, how would the pressure be expected to change?(1 point)
Responses
It would become zero.
It would become zero.
It would remain constant.
It would remain constant.
It would decrease.
It would decrease.
It would increase.
It would increase.
When the pressure of a gas decreases, which quantity will increase, assuming all other variables are held constant?(1 point)
Responses
T
T
V
V
n
n
R
V
Two balloons hold two different gases. The gases are held at the same pressure, volume, and temperature. Which quantity can differ between the two gases?(1 point)
Responses
the gas constant of each gas
the gas constant of each gas
the number of moles of each gas
the number of moles of each gas
the molar volume of each gas
the molar volume of each gas
the mass of each gas
the number of moles of each gas
In the lake, fish tend to inhabit deeper waters during the warmer periods of the day. Which explanation most accurately correlates this behavior with the solubility of gases?(1 point)
Responses
Gases are more soluble at high temperatures.
Gases are more soluble at high temperatures.
Solubility of gases increases under elevated pressures.
Solubility of gases increases under elevated pressures.
Solubility of gases increases under reduced pressures.
Solubility of gases increases under reduced pressures.
Gases are more soluble at low temperatures.
Gases are more soluble at low temperatures.
The following table displays four solutions created through the dissolution of salt in water.
Solution | mass of NaCl (g) | Volume of water (mL)
A 5.0 50.0
B 5.0 75.0
C 5.0 100.0
D 5.0 125.0
Among the provided solutions, which one exhibits the greatest concentration of salt?
(1 point)
Responses
Solution C
Solution C
Solution D
Solution D
Solution B
Solution B
Solution A
Solution D
Tim conducted experiments with various aqueous solutions to identify the solution displaying the highest conductivity. The diagram illustrates the equipment he employed, while the table enumerates the aqueous solutions subjected to his testing.
Which of the aqueous solutions is most probable to have resulted in the brightest glow of the bulb?
(1 point)
Responses
NH3(aq) because it is a weak electrolyte
NH 3 ( aq ) because it is a weak electrolyte
KCl(aq) because it is a strong electrolyte
KCl( aq ) because it is a strong electrolyte
C12H22O11(aq) because it is a nonelectrolyte
C 12 H 22 O 11 ( aq ) because it is a nonelectrolyte
CH3OH(aq) because it is an electrolyte
KCl(aq) because it is a strong electrolyte
A student arranges an investigation to examine the variables influencing the solubility of sodium chloride. The student introduces 5.0g of sodium chloride into four separate beakers, each holding 250 mL of water. Next, the student positions the beakers on distinct hot plates and elevates their temperatures to the subsequent levels:
Beaker A: 30°C
Beaker B: 40°C
Beaker C: 50°C
Beaker D: 60°C
In which of the beakers would the dissolution of sodium chloride occur most rapidly?
(1 point)
Responses
Beaker B
Beaker B
Beaker D
Beaker D
Beaker A
Beaker A
Beaker C
Beaker D
Two sets of students engaged in a competition to determine which group could achieve the fastest dissolution of 5 grams of salt in 50 mL of water. The table illustrates the techniques they employed.
Which group is presumed to have achieved a quicker dissolution of the salt?
(1 point)
Responses
group X because they used a cup to add the salt
group X because they used a cup to add the salt
group Y because they stirred the water vigorously
group Y because they stirred the water vigorously
group X because they used a larger cylinder
group X because they used a larger cylinder
group Y because they used a wristwatch to record time
group Y because they stirred the water vigorously
Emily opted to perform a trial to ascertain if stirring impacts the speed at which an antacid dissolves. Her hypothesis posited that increasing the speed of stirring would lead to a decreased duration for the antacid to dissolve.
Based on her data, what can we conclude?
(1 point)
Responses
The data supports the hypothesis.
The data supports the hypothesis.
The data has no relationship to the hypothesis.
The data has no relationship to the hypothesis.
The data is biased.
The data is biased.
The data does not support the hypothesis.
To accurately respond to this question, the provided data is required. Please provide the data or any relevant information from the experiment in order for me to draw a conclusion.
Emily opted to perform a trial to ascertain if stirring impacts the speed at which an antacid dissolves. Her hypothesis posited that increasing the speed of stirring would lead to a decreased duration for the antacid to dissolve.
Sample | Amount of water (in mL) | temperature of water (in C) | Rate of stirring | time required to
dissolve (in sec)
X 300 25 no stirring 220
Y 300 25 slow stirring 80
Z 300 25 fast stirring 45
Based on her data, what can we conclude?
(1 point)
Responses
The data supports the hypothesis.
The data supports the hypothesis.
The data has no relationship to the hypothesis.
The data has no relationship to the hypothesis.
The data is biased.
The data is biased.
The data does not support the hypothesis.
The data supports the hypothesis. Increasing the speed of stirring resulted in a decreased duration for the antacid to dissolve. This is evident from the decreasing times required to dissolve the antacid in the different stirring conditions (220 sec without stirring, 80 sec with slow stirring, and 45 sec with fast stirring).
Instructions: Utilize the solubility graphs provided for typical potassium and sodium salts below, along with your comprehension of chemistry, to respond to the question.
Using the data from the graph, which of these solutions can be identified as saturated?
(1 point)
Responses
70 grams of NaNO3 dissolved in 100 grams of water at 0°C
70 grams of NaNO 3 dissolved in 100 grams of water at 0°C
70 grams of KNO3 dissolved in 100 grams of water at 50°C
70 grams of KNO 3 dissolved in 100 grams of water at 50°C
40 grams of KCl dissolved in 100 grams of water at 43°C
40 grams of KCl dissolved in 100 grams of water at 43°C
40 grams of NaCl dissolved in 100 grams of water at 50°C
40 grams of KCl dissolved in 100 grams of water at 43°C
A solubility chart is shown below.
What is the maximum amount of KNO3 that can be dissolved in 100 cm3 of water at a temperature of 35°C?
(1 point)
Responses
55 g
55 g
45 g
45 g
50 g
50 g
60 g
According to the solubility chart, the maximum amount of KNO3 that can be dissolved in 100 cm3 of water at a temperature of 35°C is 50 g.
The depicted graph illustrates the quantities of different solutes that can dissolve in 100 grams of water at specific temperatures.
image d5a7c3dc4e524de8959d036914123f30
Referring to the data presented in this graph, which chemical compound would exhibit lower solubility at 50°C compared to 20°C?
(1 point)
Responses
Ce2(SO4)3
Ce 2 (SO 4 ) 3
KCl
KCl
NaCl
NaCl
KNO3