Law of Conservation of Mass IPC 8 C

Law of Conservation of Mass IPC 8. C Investigate and Identify the Law of Conservation of Mass

A Chemical Reaction must be balanced. A reaction equation shows the same number and kind of atoms on both sides. Reactants Products

Al + O 2 ® Al 2 O 3 http: //richardbowles. tripod. com/chemistry/balance. htm

1 1 3 5 __N 5 2 + __H 15 2 __NH 3

Law of Conservation of Mass: The total mass of substances does not change during a chemical reaction. reactant 1 + reactant 2 total mass calcium oxide Ca. O 56. 08 g + + product = carbon dioxide CO 2 + 44. 00 g academic. evergreen. edu/curricular/matterandmotion/chem_phys%5 Clectures%5 Coct 5. ppt – total mass calcium carbonate Ca. CO 3 100. 08 g ?

If a gas is produced in a chemical reaction, it can be difficult to measure its mass if it escapes into the surroundings.

The illustrations show a conservation-of-mass experiment. The solution in the beaker lost mass because — A materials have less mass at high temperatures B the mass of the reactants and products was less than 100 g C sodium sulfate (Na 2 SO 4) is lighter than air D some of the water molecules turned into gas

In the procedure shown above, a calcium chloride solution is mixed with a sodium sulfate solution to create the products shown. Which of the following is illustrated by this activity? F The law of conservation of mass G The theory of thermal equilibrium H The law of conservation of momentum J The theory of covalent bonding

24 CO 2 24 H 2 O 4 24 O 2 To produce 4 molecules of sugar, a plant needs — If one thing in an equation is A 6 molecules of hydrogen changed, all other reactants B 12 molecules of ATP and products must be changed C 18 molecules of water by the same amount. D 24 molecules of carbon dioxide

2 3 4 21 1 2 No! YES! What are the coefficients that will balance this chemical equation? A 2, 1, 1 B 3, 4, 2 C 2, 2, 1 D 4, 3, 2 Try all the answer choices to see which one works!