A person is driving on an extremely foggy day and cannot see the road ahead very well. They decide to turn on the headlights on the car. Even after turning on the headlights, the person cannot see the road ahead very well. Why does the light not help see through the fog?(1 point)
Responses
Fog is a heterogeneous mixture of water and air. It scatters light in all directions, which is why it is hard to see.
Fog is a heterogeneous mixture of water and air. It scatters light in all directions, which is why it is hard to see.
Fog is a homogeneous mixture of water and air. Homogeneous mixtures absorb light and do not let it pass.
Fog is a homogeneous mixture of water and air. Homogeneous mixtures absorb light and do not let it pass.
Fog is a homogeneous mixture of water and air. Homogeneous mixtures can be clear and easy to see through.
Fog is a homogeneous mixture of water and air. Homogeneous mixtures can be clear and easy to see through.
Fog is a heterogeneous mixture of water and air. The water will separate from the air when the light hits it, making it easier to see.
Fog is a heterogeneous mixture of water and air. It scatters light in all directions, which is why it is hard to see.
What of the following is an advantage of the thermal properties of plastic?(1 point)
Responses
Plastics are easy to mold into any shape.
Plastics are easy to mold into any shape.
Heating plastics eliminates the risk of BPA exposure.
Heating plastics eliminates the risk of BPA exposure.
The thermal conductivity of plastic is very high, making it a good material to transmit heat.
Plastics are easy to mold into any shape.
Which phase change is the opposite of boiling?(1 point)
Responses
evaporation
evaporation
condensation
condensation
freezing
freezing
melting
condensation
As the pressure of a gas decreases to half its original value, what happens to the volume of the gas if temperature is held constant?(1 point)
Responses
The volume decreases to one-fourth of its original value.
The volume decreases to one-fourth of its original value.
The volume increases to four times its original value.
The volume increases to four times its original value.
The volume increases to twice its original value.
The volume increases to twice its original value.
The volume decreases to half of its original value.
The volume decreases to half of its original value.
The volume increases to twice its original value.
There are 300 light particles in an airtight container. Which adjustment would increase the speed of the particles?(1 point)
Responses
keeping the volume constant and replacing the light particles with heavy particles
keeping the volume constant and replacing the light particles with heavy particles
keeping the pressure constant and increasing the temperature
keeping the pressure constant and increasing the temperature
keeping the volume constant and cooling the container
keeping the volume constant and cooling the container
keeping the temperature constant and increasing the container volume
keeping the pressure constant and increasing the temperature
The relationships among which variable quantities are expressed by the ideal gas law equation?(1 point)
Responses
pressure, volume, number of moles, mass
pressure, volume, number of moles, mass
volume, temperature, number of moles, gas constant
volume, temperature, number of moles, gas constant
pressure, volume, temperature, number of moles
pressure, volume, temperature, number of moles
pressure, volume, temperature, molar mass
pressure, volume, temperature, molar mass
pressure, volume, temperature, number of moles
When salt dissolves completely into water, which term is used to describe the water? (1 point)
Responses
solute
solute
solution
solution
concentration
concentration
solvent
solvent
Which statement best describes what happens when oil and water are stirred together?(1 point)
Responses
Oil and water molecules have like charges, causing them to repel each other and separate.
Oil and water molecules have like charges, causing them to repel each other and separate.
Water molecules will attract each other electrically, but they will not attract oil molecules, causing separation.
Water molecules will attract each other electrically, but they will not attract oil molecules, causing separation.
Oil molecules will repel each other electrically, leading to complete mixing of the two substances.
Oil molecules will repel each other electrically, leading to complete mixing of the two substances.
Water and oil molecules have opposite electrical charges, causing them to repel each other and separate
Water molecules will attract each other electrically, but they will not attract oil molecules, causing separation.
Crystals are made using supersaturated solutions of solids in water. These solutions hold more of the solute than they would at room temperature. How are these solutions made? (1 point)
Responses
The water would need to be chilled to a lower temperature, which would take kinetic energy away from molecules and ions, increasing solubility.
The water would need to be chilled to a lower temperature, which would take kinetic energy away from molecules and ions, increasing solubility.
The water would need to be heated to a higher temperature, which would give molecules and ions more kinetic energy, increasing solubility.
The water would need to be heated to a higher temperature, which would give molecules and ions more kinetic energy, increasing solubility.
The water would need to be chilled to a lower temperature, which would give molecules and ions more kinetic energy, increasing solubility.
The water would need to be chilled to a lower temperature, which would give molecules and ions more kinetic energy, increasing solubility.
The water would need to be heated to a higher temperature, which would take kinetic energy away from molecules and ions, increasing solubility.
The water would need to be heated to a higher temperature, which would take kinetic energy away from molecules and ions, increasing solubility.
The water would need to be heated to a higher temperature, which would give molecules and ions more kinetic energy, increasing solubility.
Question
Which substance is most likely to dissolve in greater quantities in cold water? (1 point)
Responses
potassium chloride
potassium chloride
sodium chloride
sodium chloride
oxygen
oxygen
sugar
sugar
How is a mole related to concentration?(1 point)
Responses
The volume of particles of solute in a solution is measured in moles.
The volume of particles of solute in a solution is measured in moles.
The mass of the solute in a solution is measured in moles.
The mass of the solute in a solution is measured in moles.
The saturation point of a solution is measured in moles.
The saturation point of a solution is measured in moles.
The number of particles of solute in a solution is measured in moles.
The number of particles of solute in a solution is measured in moles.
Which statement best describes what it means when something is classified as a strong acid?(1 point)
Responses
It is present in large quantities in a solution.
It is present in large quantities in a solution.
It easily dissociates into ions in solution.
It easily dissociates into ions in solution.
It is present in low quantities in a solution.
It is present in low quantities in a solution.
It resists dissociating into ions in solution.
It easily dissociates into ions in solution.
Question
Which substance is most likely to dissolve in greater quantities in cold water? (1 point)
Responses
potassium chloride
potassium chloride
sodium chloride
sodium chloride
oxygen
oxygen
I apologize for the incorrect response earlier.
The substance most likely to dissolve in greater quantities in cold water is sodium chloride.