cycles of matter

Law of conservation of mass states that 

• matter is created
• matter is destroyed
• matter is neither created nor destroyed
• matter does not change

Evidence of a chemical reaction include:

• Phase change
• No new substance
• Bubbles forming
• Shape change

Matter is anything that

• takes up space and has mass.
• is in our universe.
• is light, sound or ideas.

Which of the following is not a compound?

• HCl
• Cl
• NaCl
• CO2

Element is a

• pure substance
• compound
• mixture
• molecule

What does this formula represent?
CO₂ +H₂O >>sunlight>>C₆H₁₂O₆ + O₂

• Cellular Respiration
• Photosynthesis
• Ecological Chemical Pathways
• Chemosynthesis

During photosynthesis, plants release _____into the world.

• Nitrogen
• Water
• Oxygen
• Helium

What happens when organisms die and decay? 

• Their nitrogen moves to the air as nitrogen gas
• Their nitrogen returns to the soil as ammonium
• Their nitrogen becomes tapped in clay and is unusable
• They stay on earth forever

Carbon dioxide is added to the atmosphere by

• Burning fossil fuels 
• Cellular respiration
• Decomposing organic matter
• All answers are correct

The nitrogen found in the atmosphere is not in a form that plants or animals can use.  What converts it into a usable form?

• Bacteria
• Photosynthesis
• Decomposition of organisms
• Fungi