OVERALL REVIEWER

Question 1

A ____________ is the symbolic REPRESENTATION of a chemical change in the form of symbols and formula.

Answer 1

Chemical Equation

Question 2

A __________ tells us the number of atoms of each element in a compound.

Answer 2

Chemical formula

Question 3

A process in which one or more substances, the reactants, are converted to one or more different substances, the products

Answer 3

Chemical Reactions

Question 4

Type of chemical reaction where two or more reactants form a single product. Also called as synthetic reaction.

A + B -> AB

Answer 4

Combination Reaction

Question 5

Involves the breakdown of a single reactant into two or more products.

AB -> A + B

Answer 5

Decomposition Reaction

Question 6

More active substance is a compound. Also called as substitution reaction.
A + BX -> AX + B

Answer 6

Single Replacement Reaction

Question 7

Switching of the cations and anions of two reactants. Also called as ionic reaction.
AX + BY -> AY + BX

Answer 7

Double Replacement Reaction

Question 8

Reaction of oxygen with a substance in the presence of heat.
O2

Answer 8

Combustion Reaction

Question 9

A _________________ shows the exact number of atoms of each element in the smallest unit of a substance.

Answer 9

Molecular Formula

Question 10

The ________________ tells us which elements are present and the simplest whole-number ration of their atoms, but not necessarily the actual number of atoms in a given molecule.

Answer 10

Empirical Formula

Question 11

atoms that contain an uneven number of protons and electrons which results in an overall positive or negative change

Answer 11

ions

Question 12

atoms that contain positive charge

Answer 12

cation

Question 13

atoms that contain negative charge

Answer 13

anion

Question 14

__________are single neutral particles.

Answer 14

atoms

Question 15

______________ are neutral particles made of two or more atoms bonded together.

Answer 15

molecules

Question 16

two or more different chemical elements combined in a fixed ratio.

Answer 16

compound

Question 17

shorthand way of expressing chemical reaction using numbers, symbols, and formula

Answer 17

chemical equation

Question 18

the starting materials in a chemical equation

Answer 18

reactants

Question 19

these are the substances that changes when it is combined with another substance in a chemical reaction

Answer 19

reactants

Question 20

is the process by which a chemical change takes place, a change where a new substance is formed

Answer 20

chemical reaction

Question 21

the new substance formed in a chemical reaction

Answer 21

product

Question 22

the substances that result of the chemical reaction

Answer 22

products

Question 23

the number before the symbol or formula of a substance

Answer 23

coefficient

Question 24

number of atoms of the elements found in the substance

Answer 24

subscript

Question 25

the sum of the masses of the products is always the same as the sum of the masses of the reactants

Answer 25

balancing chemical equations

Question 26

states that mass is neither created or destroyed in any ordinary chemical reaction

Answer 26

balancing chemical equations

Question 27

explains that the amount of the reactants is always equal to the amount of the products is any chemical reaction. this law states that in any chemical reaction, atoms are always conserved. no atoms will be destroyed or automatically created. they just undergo formation of new substances, but the number of atoms are still intact before and after any reaction

Answer 27

law of conservation of matter