Mass: a measurement of how much matter an object contains.
Compound: a pure substance formed from chemical combinations of two or more different elements.
Chemical Change: a change in which one ore more substances combine or decompose to form new substance.
Physical Change: changes that only alters the form of the substance, but not its identity.
**Know how to do simple balancing equation. Keep in mind that the left side(reactant(s)) of the elements should always equal the right side( product(s)).
Everything is Matter.
Coefficient: is the number in front of the formula. It tells how many molecules of a given formulas are present. It indicates how many molecules or atoms of each reactant and product are involved in a reaction.
Subscript: smaller number to right-lower of the element. It reflect each elements atomic contribution to a given molecule. It tells the # of atoms in a molecule or ratio of element in a compound.
Products: a substance formed as a result of a chemical reaction.
Reactants: a substance that enters into a chemical reaction.
Chemical Equation: a short, easy way to show chemical reaction, using symbols instead of words.
Chemical Formula: a combination of symbols that represent the elements in a compound.
Answers to the Balancing Equation Sheet:
1) 4 Na + O2 --> 2Na2O
2) 2H2 + O2 --> 2H2O
3) Na2SO4 + CaCl2 --> CaSO4 + 2NaCl
4) 2Al2O3 --> 4Al + 3O2
5) N2 + 3H2 -->2NH3
6) 3Fe + 4H2O --> Fe3O4 + 4H2
7) P4 + 5O2 --> P4O10
8) 2C2H6 + 7O2 --> 4CO2 + 6H2O
9) SiCl4 --> Si + 2Cl2
10) C + 2H2 --> CH4
Don't forget about how to count the Atoms from your 2 practice sheets on counting the atoms.