Ch. 7

Question 1

Oxidation is ____ Reduction is ____

Answer 1

lost of electrons; gain of electrons

OILRIG

Question 2

a ____ must always be accompanied by a reduction

Answer 2

oxidation

Question 3

the number of electrons lost in the oxidation reduction reaction is equal to….

Answer 3

the number of electrons gained in the reduction reaction

Question 4

in biological systems, the term oxidation describes….

Answer 4

the gain of oxygen or loss of hydrogen

Question 5

in biological systems, the term reduction describes….

Answer 5

the loss of oxygen or gain of hydrogen

Question 6

a reaction in which electrons are lost from one reactant and gained by another reactant

Answer 6

oxidation-reduction reaction

Question 7

1 mole = ? particles

Answer 7

Avogadro’s number or 6.02 x 10 to the 23rd power

Question 8

REMINDER: the subscripts in the formula indicate the number of moles of each element in 1 mole of that compound. For example

1 mole of Mg3N2 = ? moles of Mg atoms

1 mole of Mg3N2 = ? moles of N atoms

Answer 8

3 moles of Mg atoms

2 moles of N atoms

Question 9

The molar mass (g/mole) of an element is numerically equal to….

Answer 9

its atomic mass in grams

Question 10

The molar mass (g/mole) of a compound is ….

Answer 10

the sum of the molar mass (grams) for each element multiplied by the subscript in the formula

Question 11

We always round the molar mass to the…

Answer 11

hundredths place (0.01) or use at least 4 sig figs

Question 12

in a limiting reactant problem, the availability of one of the reactants limits….

Answer 12

the amount of products

Question 13

the reactant that is used up is the

Answer 13

limiting reactant

Question 14

the reactant that remains is the

Answer 14

excess reactant

Question 15

the limiting reactant produces the….

Answer 15

smaller number of moles of product

Question 16

theoretical yield is the max amount of product calculated for a given….

Answer 16

amount of reactant

Question 17

percent yield is the ratio of the actual amount (yield) of product obtained to the

Answer 17

theoretical yield

Question 18

percent yield =

Answer 18

actual mass produced / theoretical mass X 100%

Question 19

provides us with energy from food

Answer 19

oxidation reduction

Question 20

provides electrical energy in batteries

Answer 20

oxidation reduction

Question 21

occurs when iron rusts

Answer 21

oxidation

Question 22

when electrons are transferred from one substance to another

Answer 22

oxidation-reduction reaction

Question 23

in many biochemical oxidation-reduction rxn’s, the transfer of hydrogen atoms is necessary for the production of energy, but the intermediate products are?

Answer 23

toxic

causing headaches and possible death as they interfere with key reactions in cells

Question 24

Oxidation ALWAYS

may be seen as

Answer 24

ALWAYS loss of electrons

may be addition of oxygen or loss of hydrogen

Question 25

Reduction ALWAYS

may be seen as

Answer 25

ALWAYS gain of electrons

may be loss of oxygen or gain of hydrogen

Question 26

1 mole = how many items (particles)?

Answer 26

avogadro’s number 6.02 x 10 ^ 23rd

Question 27

the chemical subscripts specify the

Answer 27

Atoms in 1 molecule

Moles of each element in 1 mole

Question 28

C9H8O4

1 molecule: _ atoms C, _ atoms of H, _ atoms of O

1 mole: _ moles C, _ moles of H, _ moles of O

Answer 28

C9H8O4

1 molecule: 9 atoms C, 8 atoms of H, 4 atoms of O

1 mole: 9 moles C, 8 moles of H, 4 moles of O

Question 29

for any element, the quantity called molar mass is teh quantity in grams that equals the ____ ____ of that element

Answer 29

atomic mass

Question 30

the mass of 1 moles of an element also the atomic mass expressed in grams

Answer 30

molar mass

Question 31

molar mass of molecule

Answer 31

mass of each individual element added depending on the number of moles of that element in one mole of the molecule