chap 3---chem 103

Question 1

microscopic level deals w what size of particles

Answer 1

atoms

Question 2

macroscopic level deals with what size of particles?

Answer 2

moles

Question 3

what level of particles can a chemical formula be read on?

Answer 3

either macro or micro levels

Question 4

definition of balanced

Answer 4

numbers and kind of atoms on both sides are equal to one another (law of mass conservation)

Question 5

definition of formula unit

Answer 5

a unit (atom,ion, or molecule) that corresponds to a given formula

Question 6

molecular weight definition

Answer 6

substance is the average mass of the substances molecules

Question 7

formula weight definition

Answer 7

sum of atomic weighs of all atoms in a formula unit of any compound (molecular or ionic)

Question 8

stoichiometry definition

Answer 8

chemical arithmetic for mole to mass

Question 9

yield definition

Answer 9

amount of product actually formed

Question 10

percent yield definition

Answer 10

(amount actually formed/theoretical)x100

Question 11

limiting reactant

Answer 11

the amount that limits how much of the product is formed

Question 12

theoretical yield definition

Answer 12

how much the limiting reactant should allow to be made

Question 13

percent composition

Answer 13

compound is expressed by identifying the elements present & giving the mass % of each

Question 14

empirical formula definition

Answer 14

multiplying subscripts until trial and error allows the whole numbers to be found (smallest whole number ratios)

Question 15

molecular formula definition

Answer 15

yells actual numbers of atoms in molecular formula

Question 16

combustion analysis

Answer 16

determine % composition and emperifollada formula for organic carbon and hydrogen compounds

Question 17

how does the conservation of mass apply to balancing equations

Answer 17

a chemically balanced equation must have the same mass on both sides of the arrow