chemical reactions

Question 1

valence electron

Answer 1

an electron in an outer orbital that can form bonds with other atoms

Question 2

reactants

Answer 2

in a chemical equation, the substances on the left side of the equation; the starting materials in a chemical reaction.

Question 3

products

Answer 3

the substances on the right side of a chemical equation that are formed in a chemical reaction.

Question 4

polar covalent bond

Answer 4

unequal distribution of electrons in an atom

ex: water

Question 5

non-polar covalent bond

Answer 5

electrons are shared equally between two atoms

Question 6

balancing chemical reactions

Answer 6

there is a change in the bond, but not the total mass of the elements entering and exiting

there must be the same numbers of each element on both sides of the equation.

Question 7

mole

Answer 7

atomic mass, measured in grams, of a substance.

ex: the atomic mass of carbon is 12amu therefore 12 grams of carbon is 1 mole of carbon

ex 2: the atomic mass of NaCI has the atomic mass of 36.5amu therefore 36.5 grams of NaCI is 1 mole of table salt.