Heat vs. Temperature
which direction does heat flow between an ice cube and a hand?
from the hand to the ice cube
How many sig figs are in the following numbers?
100.00
4.089
.00059
5, 4, 2,
Water has undergone a _______________ when it is turned from a liquid to a gas through boiling.
What is a physical change
A measure of the average kinetic energy is what?
What is temperature.
Give the answer in the correct number of sig figs
9.745 + 56.18
65.93
What is the result of mixing two or more substances together without combining their atoms?
what is a mixture
Burning and rusting are similar because they both are _______________.
What is a chemical change.
The point at which there is no kinetic energy is called.
What is zero Kelvin or (absolute zero).
Give the answer in the correct number of sig figs
1458 X .18
260
How would you separate a mixture of 2 liquids with different boiling points?
What is Distillation
The specific heat(C) for water is what?
What is 4.18 J/(g)(degrees celcius)
____________ changes occur when sugar is added to coffee to sweeten it.
What is a physical change
when energy leaves a substance and the surrounding feel warm we call the process what?
What is Exothermic
This is what happens to the molecules of a substance when it is put into a solution
Nothing it is not a chemical change.
What is another name for a solution?
What is a homogeneous mixture
The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature is what?
What is heat of fusion
when energy enters a substance and the surroundings feel cold we call the process what?
What is an exothermic process
Why is the Hv so much larger than the Hf value
it takes more energy to separate the molecules of a liquid into a gas
Homogeneous particles are uniform