Mamma Mich's Science Quiz topic 4-6

If Ms. Cawston compares students to particles in a substance, what is happening to the substance when the class moves from the regular classroom to the gym?

• The substance is changing state by freezing.

• The substance is expanding.

• The substance is contracting.

• The substance is cooling down.

What might have been the cause for the change described in the previous question?

• Energy is transferred from the particles to the environment.

• The substance is creating energy and making the particles move faster.

• The substance is being heated.

• The substance itself is transferring heat energy to its particles.

While they were in the gym, Ms. Cawston told her students to imagine that they were particles in a liquid and the gym was the container they were in. What should the students do to simulate the behavior of particles in a liquid?

• Spread out evenly throughout the whole gym.

• Move to one side of the gym and then stay in one place.

• Link hands and move around the gym as a single unit.

• Start by spreading out evenly throughout the gym and then slowly come back together into the middle.

Ms. Cawston took her class back to their classroom and told them to sit down in their desks, which were spread out evenly in the room. She told them that they were now simulating the distribution of particles in a solid. Which of the following graphs best represents the change in the volume of most substances when they change from a liquid to a solid (water is an exception)?

• Graph A

• Graph B

Ms. Cawston wanted to know just how hot it was that day so she looked at a liquid thermometer that students had mounted to an outside wall of the school. Which of the following statements about a liquid thermometer is true?

• The liquid inside the thermometer expands as it is heated and moves up the bore of the thermometer.

• The liquid inside the thermometer contracts as it is heated and moves up the bore of the thermometer.

• Water is used in liquid thermometers because it gives very accurate readings below 0°C.

• Thermometers can only be built using liquids because gases don't change volume enough when heated or cooled.

As she was going back inside the school at the end of that long, hot day, Ms. Cawston noticed that a metal wire that had been strung across the courtyard of the school was sagging down quite a bit. Which of the following statements is true?

• The metal wire was tighter when it was strung up on a cold winter day.

• The metal wire sagged even more when it was hung up on a cold winter day.

• The metal wire is sagging the same amount, regardless of the air temperature.

• The metal wire is sagging because it was strung up tightly on an even hotter day.

If Ms. Cawston were to take down the wire and hang it up again so that there was less slack in it, what would she need to consider?

• The wire will expand in the winter, so she should tighten it as much possible on that hot day.

• The wire will contract in the winter, so she should tighten it as much as possible on that hot day.

• The wire will expand in the winter; therefore she should ensure there is some slack in it so it doesn't break on a cold winter day.

• The wire will contract in the winter; therefore she should ensure there is some slack in it so it doesn't break on a cold winter day.

Jenny was relaxing in her front yard on a hot day. Her yard was grass with a brick patio and an asphalt driveway. The following questions relate to her experiences that day. When Jenny stepped from the grass onto the black asphalt she noticed that there was a distinct difference in temperature between the two, even though they had spent the same amount of time in the sunlight. The asphalt was warmer than the grass because it probably has:

• a higher specific heat capacity and so it heats up quickly

• a lower specific heat capacity and so it heats up quickly

Jenny noticed that the temperature of the bricks in the patio felt different from both the grass and the asphalt. How could Jenny measure the specific heat capacity of each of the three substances?

• Determine how much thermal energy is required to warm or cool the object by 1°C.

• Determine the mass of the objects and divide by the temperature of each one.

• Determine the temperature change of each substance in a set amount of time.

• Determine how much thermal energy is required to heat or cool one gram of the substance by 1°C.

Jenny found that the bricks felt warmer than the grass, even though they had spent the same amount of time in the sun. This probably means that the bricks will cool down:

• more slowly than the grass because the bricks have a higher specific heat capacity

• more quickly than the grass because the bricks have a higher specific heat capacity

• more slowly than the grass because the bricks have a lower specific heat capacity

• more quickly than the grass because the bricks have a lower specific heat capacity