Energy Transfer
What must be added to water to change from liquid to gas?
Energy or heat
What is a hypothesis
an idea/ statement that can be tested
How does hot water heat cold water?
Heat flows from hot to cold
Sequence when ice is heated
Solid -> liquid-> gas
Explain the Energy transformation when wood burns?
Chemical energy -> thermal and light energy
An outcome/ Result/ Measured
Dependent Variable
What is the end result of mixing hot and cold water?
All water reaches equilibrium temperature
Heat water on stove... is an example of what sequence
Liquid -> gas
what energy transformation is used for this scenario? A toaster browning bread
Electrical energy into thermal energy
Independent variable
The measure of hotness or coldness expressed in terms of any of several scales
Temperature
Ice melts, then boils. Is an example of what states of matter sequence.
Solid -> liquid -> gas
A wind turbine generating power show which energy converting
Mechanical energy to electrical energy
A hypothesis is a testable prediction you start with.
A theory is an established explanation supported by a lot of evidence over time.
Name the three methods of heat transfer.
Conduction, convection, radiation.
What process changes a solid directly into a gas?
Sublimation
Why is electrical energy output less than mechanical input in a wind turbine
Energy is always lost as heat
Why is a disproven hypothesis still valuable
Provides info for future investigations
Why does metal feel colder than wood at the same temperature?
Metal conducts heat away from your hand faster.
What happens to molecules during melting?
They gain energy and move apart.