Temperature
Heat Transfer
Molecular Attraction
Changes of State
Temperature Data
100
In the United States, the most common temperature scale is called the ________________ scale.
What is Fahrenheit.
100
______________ is thermal energy moving from a warmer object to a cooler object.
What is heat.
100
Which has greater molecular attraction, isopropyl alcohol (IA) or water?
What is water?
100
All matter exists in three states which are...
What is solids, liquids, and gases.
100
The ______ temperature is a number calculated by adding all numbers together and dividing by how many numbers you added together.
What is average.
200
The temperature scale used in most of the world is the _________________ scale.
What is Celsius.
200
Molecules in a hotter sample will be moving _____.
What is faster.
200
When __________ overcomes the molecular attraction, a phase change can occur.
What is kinetic energy?
200
The physical change from one state of matter to another is called a ___________________.
What is change of state.
200
The air in Mrs. Fullner-Grennen's room measured 16◦C in the morning. Later in the afternoon the thermostat measured 21◦C. What happened to the air molecules during the day?
The molecules started moving faster.
300
On this scale, the number 32 is assigned to the temperature at which water freezes.
What is Fahrenheit.
300
There will always be heat transfer between two objects that are touching if there is a _______ in the temperatures in each object.
What is difference.
300
An object in its ______ phase do not have enough energy to break the forces of attraction holding them together.
What is solid.
300
Matter will change from one state to another if thermal energy is ______________ or ______________.
What is absorbed or released.
300
What is 4 and 24.
400
On this scale, the number 100 is assigned to the temperature at which water boils.
What is Celsius.
400
Heat transfer will stop when ____.
The molecules reach a state of equilibrium
The molecules are moving at the same speed
The kinetic energy is equal
400
Two different liquids are at room temperature. Scientists cooled them to a lower temperature. Substance 1 changed phase, but Substance 2 did not. What happened to the behavior of the molecules in Substance 1?
Its molecules now move in place forming a solid.
400
Freezing occurs when a substance ____________ thermal energy.
What is loses.
400
Estimate what final temperature each sample would reach once in contact (this is called equilibrium temperature). Explain your thinking.
40C because energy would transfer from the hotter sample to the colder sample until both reached the same temperature and all molecules are moving at the same pace.
500
At this temperature, no more energy can be removed from matter.
What is absolute zero.
500
Energy transfer occurs when molecules ______.
What is collide with each other.
500
Two different liquids are at room temperature. Scientists cooled them to a lower temperature. Substance 1 changed phase, but Substance 2 did not. Substances 1 is different than Substance 2 because _____.
Substance 1 has a stronger attraction between its molecules than Substance 2.
500
When gas loses a sufficient amount of thermal energy, it will change into a ______________.
What is liquid.
500
As you increase the temperature of a substance, why does the temperature plateau before increasing again?
This plateau is where a phase change is occuring. For example, water boils at 100F, the water will maintain 100F until all water has evaporated and turned to a gas.