CH3 Calculations w/ formulas & chemical equations

Question 1

Reactants

Answer 1

Left of the arrow

Question 2

Balancing equation rules

Answer 2

1. adjust coefficient in front of chemical formulas

2. Subscripts are never changed

Question 3

Combination reactions

Answer 3

2+ substances react to form one product (aka synthesis)

- fewer products than reactants

Question 4

Decomposition reaction

Answer 4

one substance reacts to form 2+ products

Question 5

Combustion RXN

Answer 5

Rapid which produce a flame (O2 most often involved)

Question 6

Moles =

Answer 6

mass/ molecular mass

Question 7

g/mol =

Answer 7

1 dalton

Question 8

Formula weight (FW)

Answer 8

sum of atomic weights for the atoms in a formula

Question 9

Molecular weight

Answer 9

sum of atomic weights of the atoms in a given molecule

Question 10

Percentage composition formulas… % element=

Answer 10

(#of atoms in element)x(atomic weight of element)x(100)
/
formula weight of compound

Question 11

Avogadros number

Answer 11

6.022 x 1023

Question 12

Molar Mass

Answer 12

mass in grams of 1 mol of a substance

ex. mass of 1 mol/g of C (1 dalton) = 12g

Question 13

Finding empirical formula from mass percent

Answer 13

number of grams of each element in a given amount

* Lowest whole number ratio of moles is empirical formula *

Question 14

What is the empirical formula?

Answer 14

relative ratio of elements in a molecule

Question 15

Coefficients

Answer 15

relative number of molecules involved in a RXN

Question 16

Stoichiometric coefficient

Answer 16

relative number of moles in a balanced equation

Question 17

Stoichiometric Factors

Answer 17

convert between reactants consumed and products formed

Question 18

Stoichiometric factor notes

Answer 18

1. ratios given are IDEAL proportions

Question 19

Theoretical yield

Answer 19

amount of product predicted/ maximum yield

Question 20

Actual yield

Answer 20

amount actually obtained in RXN (less than theoretical)

Question 21

Percent yield

Answer 21

less than / equal to 100%

Question 22

solution =

Answer 22

solute dissolved in solvent

Question 23

electrolyte

Answer 23

solute that forms ions in solution

- conducts electricity

Question 24

non-electrolyte

Answer 24

solute doesn’t produce ions

- does not conduct electricity