TOPIC 4- Stoich

Question 1

It is used to determine the number of atoms in a set quantity of a substance

Answer 1

Average Mass

Question 2

it is determined based on atomic mass unit

Answer 2

Atomic mass

Question 3

the most accurate method to compare the masses of atoms involves the use of

Answer 3

Mass Spectrometer

Question 4

Ions with higher masses deviate (change) the

Answer 4

Least

Question 5

Is defined as the number equal to the number of carbon atoms in exactly 12 grams of pure 12C

Answer 5

Mole

Question 6

12 gram of ^12C is equal to

Answer 6

6.022x10^23 atoms which is the Avogadro’s number

Question 7

is the mass of one mole of the compound measured in grams

Answer 7

Molar Mass

Question 8

used for compound that do not contain molecules

Answer 8

Formula Unit

Question 9

is calculated by comparing the mass percent of the element in one mole of a compound with the total mass of one mole of the compound

Answer 9

Mass Percent

Question 10

Techniques in determining the formula compound

Answer 10

1. decomposing into its component elements
2. introducing oxygen to produce substances

Question 11

is the simplest whole number ratio of the formula

Answer 11

Empirical Formula

Question 12

always an integer multiple of the empirical formula

Answer 12

Molecular Formula

Question 13

involves the reorganization of atom in one or more substances

Answer 13

Chemical Reactions

Question 14

are situated on the left side of an arrow

Answer 14

reactants

Question 15

located on the right side of an arrow

Answer 15

products

Question 16

if bonds are broken,

Answer 16

new bonds are formed

Question 17

Atoms neither ________ nor ___________ in chemical reaction

Answer 17

created, destroyed

Question 18

is the reactant that is completely consumed

Answer 18

Limiting reactant

Question 19

When this is used up, the reaction stops

Answer 19

Limiting Reactant

Question 20

This is not completely consumed

Answer 20

excess reactant

Question 21

Is one that possesses equivalent amounts of reactants that match the numbers in the balanced equations

Answer 21

Stoichiometric Mixture

Question 22

It is the highest quantity of product that can be obtained from a given amount of limiting reactant

Answer 22

Theoretical Yield

Question 23

It is the actual amount obtained and is less than the theoretical yield

Answer 23

percent Yield