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Physical Science
Homework 7
| Question | Answer |
|---|---|
| Whether one object is warmer than another object has most to do with | Molecular Kinetic Energy |
| The motion of molecules that most affects temperature is | Transitional motion |
| The temperature of melting ice is | 0 degrees C or 32 degrees F |
| When you touch a hot penny in sunlight with your finger, energy flows | From the penny to your finger |
| Which is the smallest unit of measurement for temperature? | One Fahrenheit degree |
| The lowest temperature concievable in nature is | -273 degrees C |
| For each degree a volume of air at 0°C is cooled, its pressure | Decreases by 1/273 |
| At absolute zero, a substance has | No more energy to give up |
| A volume of helium gas has a temperature of 10°C. The same gas twice as hot has a temperature of | 293 degrees C |
| Heat is thermal energy that flows due to | Temperature differences |
| If a room is cold it is due to a | Lack of adequate thermal energy |
| Compared to a giant iceberg, a hot cup of coffee has | A higher temperature, but less thermal energy |
| Thermal energy can be measured in | calories, Calories, or Joules |
| Pour a liter of 40°C water at into a liter of 20°C water and the final temperature of the two liters becomes | at or about 30 degrees C |
| The temperature of water rises when 2.00 calories are added. It will rise the same when | 8.38 J are added |
| A nutritionist in the United States measures the food energy in units of | Calories (with a capital C) |
| When work is done on a system and no heat is added, the temperature of the system | Increases |
| Which law of thermodynamics is a restatement of the conservation of energy as it applies to thermal systems? | 1st law |
| Which law of thermodynamics states that no system can reach absolute zero? | 3rd law |
| Which law of thermodynamics addresses the direction of heat flow? | 2nd law |
| Suppose you rapidly stir some raw eggs with an egg beater. The temperature of the eggs will | Increase |
| The direction of natural processes is from states of | Higher order to Lower order |
| More disorder means | More entropy |
| Your room gets messier day by day. In this case entropy is | Increasing |
| Entropy is most closely related to the | 2nd law of thermodynamics |
| To say that water has a high specific heat capacity is to say that water | Releases a lot of energy in cooling, absorbs a lot of energy (increasing the temperature), and requires a lot of energy for an increase in temperature |
| Which of the following normally warms up faster when heat is applied- iron, glass, wood, or water? | Iron |
| A substance that heats up relatively quickly has a | Low specific heat capacity |
| San Francisco has milder winters than Washington D.C. due to water's high | Specific heat capacity |
| The specific heat capacity of aluminum is more than twice that of copper. Place equal masses of aluminum and copper wire in a flame and the wire to heat up quickest will be | Copper |
| Place a kilogram block of iron at 40°C into a kilogram of water at 20°C and the final temperature of the two becomes | Less than 30 degrees C |
| The fact that desert sand is very hot in the day and very cold at night is evidence that sand has a | Low specific heat capacity |
| Which of the following expands most when the temperature is lowered? Equal volumes of iron, wood, helium, or water at 4 degrees C? | Water at 4 degrees C |
| During a very cold winter, water pipes sometimes burst because | Water expands when freezing |
| When an iron ring is heated, the hole becomes | Larger |
| A metal ring with a gap in it is shaped like the letter C. When the hot metal cools, the gap becomes | Narrower |
| Ice has a lower density than water because ice | Is composed of open-structured crystals. |
| If the temperature of a sample of 4°C water slightly increases, the sample of water | Expands |
| If the temperature of a sample of 4°C water slightly decreases, the sample of water | Expands |
| Before ice can form on a lake, all the water in the lake must be cooled to | 4 degrees C |
| The greatest expansion of water occurs when | It turns to ice |
Created by:
akozlowski