Conservation of Mass and Energy SC.8.L.18.4
Open System
A system in which matter can enter from or escape to the surroundings.
Closed System
A system where all the mass is captured during a chemical reaction. A system in which no matter is allowed to enter or leave
Photosynthesis
Conversion of light energy from the sun into chemical energy.
Law of Conservation of Energy
Energy cannot be created or destroyed
18
If you have 18 oxygen atoms used during cellular respiration , how many oxygen atoms are available for photosynthesis?
Cellular Respiration
Process that releases energy by breaking down glucose and other food molecules in the presence of oxygen
During a chemical reaction, the total amount of mass before and after ________________.
Stays the same.
Equals the amount of stored energy in glucose
The amount of light energy used in photosyntheis
15
The mass of a piece of wood equals 30 grams before it was burned. The mass of the ashes are 15 grams. What is the mass of the gas produced in grams?
30
The mass of oxygen produced by photosynthesis is 30 grams. How much oxygen ( in grams) is absorbed during cellular respiration?
What happens to the atoms during a chemical reaction?
They break apart and regroup to form new substances.
When an iron nail rusts, it gets heavier in mass. Does the iron nail follow the Law of Conservation of Mass? The chemical equation for rusting is shown below. 4Fe + 3O2 ---> 2Fe2O3
Yes, it follows the Conservation of Mass because the number/kind of atoms before the reaction equals the number/kind of atoms after. Before: 4 Iron (Fe), 6 Oxygen (O) After: 4 Iron (Fe), 6 Oxygen (O)
Law of Conservation of Mass
states that during a chemical reaction, mass is not created or destroyed. The mass of the products equal the mass of the reactants.
Carbon Cycle
the series of processes by which carbon compounds are interconverted in the environment, chiefly involving the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels.
