Change of State Insulator? Conductor? State of Matter Huh? 100 Heat & Temperature
When you put a liquid in the freezer what will happen?
It will turn to a solid
What happens when a gas loses energy?
It condenses to a liquid
What happens when a liquid loses energy?
It freezes into a solid
What happens when a solid gains energy?
It melts into a liquid
What happens when a liquid gains energy?
It boils into a gas
At what temperature does water freeze? (Celsius)
0 degrees Celsius
What is an insulator?
An insulator does not allow heat to leave or cold to enter
What is a conductor?
Conductors are materials that permit heat or electricity to flow freely through touch.
What is endothermic?
Endothermic is when energy is absorbed or taken in.
What is exothermic?
Exothermic is energy being released
When a liquid freezes to a solid – what energy transfer takes place?
Energy is released (it’s exothermic to go from a liquid to a solid). Energy is released from the liquid to the air around it.
Is plastic an insulator or a conductor? How do you know?
Plastic is an insulator. I know this because a plastic spoon will not allow an ice cube to melt quickly or will not get hot when placed in hot soup.
Is metal an insulator or a conductor? How do you know?
Metal is a conductor. I know this because the heat is transferred to the spoon while in a hot bowl of soup.
What is sublimation?
Going from a solid to a gas.
What is deposition?
Going from a gas to a solid.
List the changes of state that show a decrease in kinetic energy.
Deposition, freezing, condensation
List the changes of state that show a increase in kinetic energy.
Sublimation, melting, boiling
What is heat?
Heat is the transfer of energy.
What is temperature?
Temperature is the measure of heat.
Which state of matter has the most kinetic energy? Which state of matter has the least kinetic energy?
Most = gas Least = solid
Why do the lines on the chart plateau?
Because it takes time and energy to change state
How has chemistry impacted people, society and technology?
Through chemistry science has created many useful items – like plastics. Plastics make our lives easier, warmer, cooler and better.
Where on this graph is the greatest average kinetic energy located? Why? A B C
The reaction requires energy for a phase change to happen.
What will happen when a substance is heated?
It will melt
What has the ability to change the state of matter?
heat
MaterialObservation plasticslightly warm stainless steelhot silververy hot woodnot warm After the spoons have been in the water for a couple of minutes, what will the student most likely observe about the temperature of each spoon? 1)After the spoons have been in the water for a couple of minutes, what will the student most likely observe about the temperature of each spoon? 2) Classify each of the materials that the student is testing as a conductor or an insulator. 3) Describe how heat transfer due to radiation could be used to affect this system. 4) Identify and describe the type of heat transfer that occurs between the hot water and the spoons. 100 ̊ C
1) The silver and stainless steel spoons will feel hot, the plastic spoon will feel warm, and the wood spoon temperature will not have changed; etc.) 2) insulators: plastic and wood; conductors: stainless steel and silver 3) Radiation could come in the form of a heat source at some distance away, such as a fire under the bowl 4) direct contact, or conduction