Show:
Matter and Energy
Force,Motion,and Energy
Photosynthesis
Molecules
Bonus!
100
What is the definition of an atom?
An atom is the smallest unit of a substance and it is the building block of all matter.
100
What is the definition of energy?
Energy is the ability to do work or cause change.
100
What is the definition of photosynthesis?
Photosynthesis is the process that green plants use to transform radiant energy to chemical energy (food)
100
What is the definition of a molecule?
A molecule is a set of a compound(can be plural) ex: 3H2O
100
How much food waste ends up in land fills?
1/3 of food waste.
200
What is the definition of an element?
the purest state of a substance.
200
What is the definition of the law of conservation of energy?
Energy can not be created nor destroyed.
200
what is the definition of decomposition?
Decomposition is the state or process of breaking down molecules into smaller molecules; decaying/rotting.
200
How are large molecules broken down into smaller molecules?
they are broken down by either decomposition or enzymes in the digestive system.
200
When plants and animals died, what happens to there remains?
They are decomposed and the their nutrients go into the soil for plant to use.
300
What is the definition of a compound?
Two or more elements chemically combined.
300
List some forms of energy.
Chemical energy Thermal energy Mechanical energy Radiant energy ect.
300
Explain the role of decomposition in allowing photosynthesis to occur.
if there wasn't decomposition plants wouldn't be able to get the nutrients they need from the soil.
300
True or False Is the breaking down of molecules a physical change?
False, its a chemical change.
300
How much food waste does an average person throw away?
224 lbs. per year
400
What are some examples of elements and compounds?
Compounds Elements H2O-water O-oxygen CO2-carbon dioxide H-hydrogen NH4-ammonia S-silicon
400
What are some examples of energy transformation?
Radiant energy--Chemical energy (photosynthesis) Mechanical energy--Thermal energy (rubbing hands together)
400
Why does energy flow in one direction?
Energy flows in one direction because in all ecosystems energy enters as radiant energy(sunlight)and is transferred through other living organisms.
400
True or False Are all molecules the same size?
False,the sizes of molecules vary.
400
What are humans doing to harm the earths decomposition process?
We are taking up a lot of land and instead of letting our food waste decompose naturally we send it to land fills.
500
How many atoms are in the compound H2O (water)?
There are three atom in H2O (water).
500
Explain that energy transformation occur to reach stability.
(interact with audience)
500
What is the definition of Cycling Matters?
When larger molecules are broken down into smaller molecules.
500
Why are small molecules necessary for life?
Small molecules are important to life because they are utilized as the building block of matter.
500
How can we persuade our school to make changes that better reflect the natural flow of matter and energy in our environment?
We can have separate trash bins where you only throw away your food waste and at the end of the school day all that food waste would be put in a compost bin so that it can decompose naturally.