Show:
Energy conversions
solar wind and chemical energy
solar continued
chemical reactions
physical properties.
100
State the law of conservation of Energy
Energy cannot be created nor destroyed, it can simply be changed
100
Why is wind considered a renewable recourse?
Because it can be replaced as it is used.
100
name items that contain chemical energy
batteries, gasoline, wood,
100
materials that burn are ______________________ which is an example of a chemical property
combustible.
200
One type of bulb uses a filament, a thin piece of wire. How does this type of light bulb work?
Electricity changes into thermal energy which makes the filament heat up so much that it glows.
200
Why is petroleum considered a nonrenewable resource?
because it takes millions of years to replace what is used which means it cannot be replaced as quickly as it is used.
200
what is solar energy
Light energy from the sun that helps you see and warms earth surface.
200
Bubbling and color change are signs of
a chemical change
200
Define melting point and boiling point.
melting point: the temperature at which a solid (such as ice) changes to a liquid. Boiling point: is the temperature at which a liquid (such as water) changes to a gas.
300
Name the heating elements in electric stoves
resistors
300
Identify the energy conversions that happen in a battery powered radio?
The chemical energy in the battery changes into electricity, and the electricity changes into sound energy
300
how does energy from a rubber band change as it is twisted
The rubber band moves as it is twisted, so it has kinetic energy. The kinetic energy changes into potential energy that is stored because the shape of the rubber band changes.
300
The mass of substances before and after a chemical change are the same. We say that matter is _________
conserved
300
Relate the mass of a bicycle to the mass of its parts.
the mass of a bicycle is equal to the mass of all its parts.
400
refrigerators and air conditioners use electricity to do what?
pump fluid through their pipes
400
How is solar energy responsible for rain?
Thermal energy causes water in oceans, lakes, and rivers to evaporate. The water in the air condenses to form clouds. Then, the water falls as rain or snow. This is known as the water cycle, which is the movement of water between the Earth’s surface and the atmosphere.
400
What is energy conversion?
a change from one form of energy into another form of energy.
400
four signs of a chemical reaction
change in temperature (i.e burning paper), change in color, ( mixing iodine with flower bubbling), and changes in odor and taste (Baking bread dough or cooking an egg)
400
compare the density, volume and mass of these two boxes in the link : http://www.bing.com/images/search?view=detailV2&ccid=svlKWCMx&id=9377EA65F81DD15532A6B8127ACC38247268C287&q=two+boxes&simid=608054425746276458&selectedIndex=22&ajaxhist=0
the smaller box has less volume than the larger box. The smaller box mass is less, than the larger box, but the density between the two boxes are the same.
500
A computer uses electricity to convert to multiple forms of energy such as (Hint, the screen speakers, and fans)
the screen uses electricity to make light energy, the speakers uses electricity to make sound energy and the fans converts electricity for mechanical energy in order to cool the computer which is producing thermal energy.
500
What is photosynthesis
a process in plants that changes solar energy into stored chemical energy.
500
The amount of kinetic energy an object has depends on ______ and __________
mass/weight and speed.
500
how do chemical changes differ form physical chagnes
new substances are formed by chemical changes. physical changes only change the physical properties of a substance. They do not form new substances.
500
cutting paper changes the properties of paper. Identify two physical properties that change and two physical properties that do not change
Cutting paper is a physical change. It changes the size and the shape of the paper. It does not change the color or the density of the paper.