Heat and Temperature Test
Heat is transferred from the heating element to the pot to the boiling water. What is the MOST likely method of heat transfer?
conduction
Heat always travels from ________ to
hot, cold.
Little Joey jumps into a pool on a cool fall morning. How can we describe the direction of energy transfer and temperature change between Joey and the water?
Energy is transferred from Joey to the water. The temperature of the water increases.
If a pot of boiling water is dumped into a tub of cold water, how does the hot water heat the cold water?
Heat flows from the hot water to the cold water.
If you go outside on a hot summer day with a double scoop ice cream cone, how will the cold ice cream interact with the hot outside air?
Heat from the air will move to the ice cream.
Why does a metal spoon left on a bowl of hot soup become warm?
Metal is a conductor.
You have a small piece of iron at 75 °C and place it into a large container of water at 25 °C. Which of these best explains what will occur over time?
Some heat from the iron will move to the water causing both to change temperatures.
Explain why a Chef in a very busy restaurant would prefer a copper pot over an aluminum pot.
The copper pot would heat faster because it has a lower specific heat value.
Robert leaves a chocolate bar in his car while attending school all day. When he goes to his car in the afternoon, the bar has changed into a gooey liquid. Which statement BEST explains what happened to Robert's chocolate bar?
The energy from the sun caused the chocolate to melt.
Reggie is taking notes about the relationship between the movement of molecules and heat energy. What statement BEST tells us what happens when a substance is heated?
The faster molecules move, the higher the temperature of the object.
Suppose you place an ice cube into a cup of hot tea? What will happen to the temperature of the ice cube and the tea?
The temperature of the ice will increase quickly, while the temperature of the tea will drop slowly. The liquids may or may not reach equilibrium.
Which of these would best describe the outcome of increasing the kinetic energy of the molecules in the above picture?
The temperature will increase.
Which picture shows the correct initial transfer of heat if you drop ice cold metal rods into a pot of boiling water?
b.
A small piece of a cold metal is placed in an insulated container filled with warm water. The temperatures of the metal and the water are recorded for several hours until equilibrium is reached. The dashed line represents the temperature of the metal, and the solid line represents the temperature of the water. Which graph BEST represents the temperature of each substance over time.
c.
Warm air rises at the equator and cold air sinks at the poles creating
convection currents
Red-hot steel ball bearings are dropped into a large bucket of cool water. Which graph BEST represents the changes in temperature that will occur?
d.
Mr. Kline's earth science class set up an experiment to compare the heating and cooling rates of sand and water. They filled cups with sand and water and then recorded the temperature change while (a) a light was shining directly on the cups and (b) the light was turned off. The data one group collected is presented in the data table. Based on this data, we would expect ___________ to have the greatest changes in temperatures during a 24-hour period.
deserts
What must be added to water in order to change state from liquid to a gas?
energy or heat
Conduction occurs more easily between solids and liquids. This is because the particles in gases are
farther apart and move faster.
As the kinetic energy of an object increases, so does the _________ energy produced.
heat
Energy is added in the form of heat to a pot of water on the stove. This causes the water to
increase kinetic energy.
Kinetic molecular theory says that as water molecules absorb energy, their motion and temperature __________ and the sample becomes ___________.
increase, warm
Mrs. Jones brings in some samples to class. She has a plastic fork, a wooden pencil, a rubber ball, and a nail. Which of these materials would be classified as a conductor of heat and electricity?
nail
The method of heat transfer by which the sun warms the earth is
radiation
Microwave ovens heat food through the process of
radiation.
Josh did an experiment recording the changes in temperature in sand and water when exposed to a light source, and then when the light source was removed. Josh noticed that the sand heated up faster than the water and then cools faster than the water. Josh concludes that
sand is the better insulator.
Timothy plays basketball in his driveway during the summer. By accident, he left the basketball outside during the winter. He tried to bounce it, but it would not bounce because it was partially deflated. During the winter, air molecules in the basketball move _____________ than in the summer. As a result, the pressure of the basketball is ___________ in the winter.
slower, low
If heat is absorbed by ice, what phase change occurs?
solid to liquid
Which particle has the most energy?
steam
The process of heat radiation is the ONLY method of heat transfer that can occur
through space.
Which situation is an example of transferring heat by means of convection?
you accidentally grabbing the hot pan from the oven