Unit 3B - Temperature and Heat
Place a 1-kilogram block of iron at 40°C into 1 kilogram of water at 20°C and the final temperature of the two becomes
less than 30°C.
The white-hot sparks from a 4th-of-July-type sparkler that strike your skin transfer
little energy to you in spite of their high temperature.
In which is the temperature greater?
both the same
A substance that heats up relatively slowly has a
high specific heat capacity.
Compared to a giant iceberg, a hot cup of coffee has
higher temperature, but less internal energy.
The fact that desert sand is very hot in the day and very cold at night is evidence that the specific heat capacity of sand is relatively
low.
Pour two liters of water at 40°C into one liter of water at 20°C and the final temperature of the two becomes
more than 30°C.
Heat energy travels from an object with a high
temperature to an object with a lower temperature.
Tomatoes have a higher specific heat capacity than dough. This means that when you bite into a hot pizza
the tomato sauce feels hotter than the dough.
The fact that a thermometer "takes its own temperature" illustrates
thermal equilibrium.
Pour a liter of water at 40°C into a liter of water at 20°C and the final temperature of the two becomes
at or about 30°C.
Heat energy is measured in units of
both of these
Aluminum has a specific heat capacity more than twice that of copper. Place equal masses of aluminum and copper wire in a flame and the one to undergo the fastest increase in temperature will be
copper
When you touch a hot potato with your finger, energy flows
from the potato to your finger.
When you touch a cold piece of ice with your finger, energy flows
from your finger to the ice.
The moderate temperatures of islands throughout the world has much to do with water's
high specific heat capacity.
Aluminum has a higher specific heat capacity than iron. This means that for equal masses of aluminum and iron, the metal that heats more quickly when the same amount of heat is applied is
iron
Which of the following normally warms up fastest when heat is applied?
iron
Temperature is most closely related to molecular
kinetic energy.
One of water's interesting thermal properties is that when heated it takes a relatively
long time in changing temperature.
If the specific heat capacity of water were lower than it is, a nice hot bath would be a
shorter experience.
If the specific heat capacity of water were lower than it is, a watermelon in a picnic cooler would cool in a
shorter time
If the specific heat of water were lower than it is, ponds in the cold winter would be
more likely to freeze.
Which unit represents the most energy?
Calorie
Which temperature scales have equal sized degrees?
Celsius and Kelvin
The air in your room is composed of molecules that have
a wide variety of speeds.
The quantity of heat that a substance can transfer relates to its
all of the above
A temperature difference of 10 Celsius degrees is also equal to a temperature difference of 10 on the
Kelvin scale.
Room temperature on the Kelvin scale is about
300 K.
The amount of heat needed to raise the temperature of 1 gram of water by 1°C is
4.19 joules
When 10 grams of hot water cool by 1°C, the amount of heat given off is
41.9 joules.
Which temperature scale has the smallest sized degrees?
Fahrenheit
A substance that cools down faster than others has a
low specific heat capacity.
A substance that heats up relatively quickly has a
low specific heat capacity.
The specific heat capacity is highest for substances that absorb or release large quantities of heat for correspondingly
small temperature changes.
