Chapter 9: Questions Flashcards
Why does a penny become warmer when struck by a hammer?
The hit creates heat between the two objects, setting there molecules in motion
Is the temperature of an object a measure of the total kinetic energy of molecules in the object, or a measure of the average kinetic energy per molecule in the object?
A measure of the average kinetic energy.
By how much does the pressure of a gas in a rigid vessel decrease when the temperature is decreased by 1C?
1/273
What pressure would you expect in a rigid container of 0C gas if you cooled it by 273C?
273/273, no change
What is the temperature of melting ice and boiling water on the Kelvin scale?
273K(melting) 373K(boiling)
Distinguish between temperature and heat.
Temperature measures average kinetic energy of particles (heat). Heat measures how fast molecules in an object are moving?
Does coldness travel from a cold surface when you touch it to your hand or does thermal energy from your hand travel to the cold surface?
Thermal energy travels from your hand to the cold surface. Energy always has to travel from hot to cold.
Distinguish between a joule and a calorie.
A joule measures heat. A calorie measures the amount of heat required to raise 1g of water to 1C.
Which is a greater increase in temperature, 1C or 1F
1C
Which has more thermal energy, a hot cup of coffee or an iceberg?
An iceberg because of its larger mass it has more thermal energy inside of it.
Does a substance that heats up quickly have a high or low specific heat capacity?
Low
How is bimetallic strip used to regulate temperature?
They are used as switches when when temperature reaches a certain point.
Which generally expands more for the same increase in temperature, solids or liquids?
Liquids
If you heat a small gap it a metal ring what will it do?
The gap will become wider.
What are the temperatures for freezing water on the Celsius and the Fahrenheit scales? For boiling water at sea level?
32F, 0C (freezing) 212F, 100C (boiling)
