| A | B |
|---|
| Molecules in all states of matter have kinetic energy. (T or F?) | True |
| What does the term absolute zero mean? | Temperature at which all moelcular motion stops. |
| Why are the terms not and cole not scientific terms? | They are based on individual opinion. The terms convey different temperatures to different people. |
| When you add food coloring to hot water, why does the color psread more quickly than if you add food coloring to cold water? | There is more movement of particles which helps spread the color faster. |
| What does the measure of temperature depend upon? | Motion of molecules in a substance. |
| Who was Count Rumford? | Credited with the discovery of heat. |
| How does heat move? | From warmer to cooler areas. |
| Objects that have been left out in a room for several hours will reach a temperature that is the same as, greater than, or less than room temperature? | Same as |
| What kinds of materials are insulators? | Materials like plastic and wood are insulators because they do not conduct heat well. |
| What is a conductor? | A materials that transfers heat well. |
| Explain the concept of heat ransfer in thermal equilibrium. | Warmer objects speed up the motion of cooler objects and vice versa. |
| Name 3 methods by which heat is transferred. | Radiation, conduction and convection. |
| What is required for heat to transfer by conduction? | Direct contact with the source of heat. |
| What is the term used to describe the transfer of heat by the movement of matter. | Convection |
| The transmission of energy by the sun is a form of what kind of heat transfer? | Radiation |
| Why do dark objects feel warmer than light colored ones? | Dark colors absorb radiant energy; light colors reflect that energy. |
| A change in state from solid to liquid is also referred to as a _____ _____. | Phase change |
| On a heating curve, phase changes have a characteristic curve called a _______. | Plateau |
| If a substance melts at 10 degrees C, what temperature will it freeze at? | 10 degrees C. Freezing and melting points are the same temperature. |
| If you have 2 vials of water at 10 degrees C and you add in 2 vials of water at 90 degrees C, what would be the temperature of the resulting mixture? | 50 degrees. |
| Since each substance has a unique boiling point, boiling point is a ____________ property. | characteristic |
| Explain how chemicals such as salt help to prevent freezing on icy surfaces. | The addition of solute lowers the freezing point of the solution. |
| T or F? All substances freeze at 0 degrees C. | False. Freezing point is a characteristic property. |
| Which requires more energy, the phase change between solid and liquid or liquid and gas? | The heat of vaporization (change between liquid and gas) requires 1000 times more energy than the heat of fusion (change between solid and liquid). |
| Explain the following statement, "All solids are frozen". | In science, the freezing point is the temperature at which a substance changes from liquid to solid. |
| Does frozen mean cold? | No. Lauric acid freezes at 43 degrees C, a relatively warm temperature. |
| Explain how hypothermia can occur in temperatures above freezing. | Prolonged direct contact with wet clothing and cool weather can draw body heat away from the body leading to hypothermia where the body's temperature is below 95 degrees F. |
