6.6 + 6.7

Question 1

Law of conservation of mass

Answer 1

matter can’t be created or destroyed

Question 2

mole-mole factor

Answer 2

ratio of moles for any two substances in an equation

Question 3

Theoretical yield

Answer 3

max amount of product

Question 4

how is theoretical yield calculated?

Answer 4

calculated with a balanced equation

Question 5

actual yield

Answer 5

amount of product obtained when reaction takes place

Question 6

percent yield

Answer 6

ratio of actual yield to theoretical yield

Question 7

formula for calculating percent yield?

Answer 7

percent yield= (actual yield(g) / theoretical yield(g)) x 100

Question 8

limiting reactant

Answer 8

substance in chemical reaction that is used up first which limits amount of product formed

Question 9

excess reactant

Answer 9

left over from limiting reactant

Question 10

What are the 3 conditions for a chemical reaction to occur?

Answer 10

1. Collision
2. Orientation
3. Energy

Question 11

Collision

Answer 11

reactants collide

Question 12

Orientation

Answer 12

reactants align properly to break/form bonds

Question 13

energy

Answer 13

collision provides energy of activation

Question 14

Activation energy

Answer 14

amount of energy required to break bonds between atoms of the reactants

Question 15

What happens if energy of collision is less than energy of activation?

Answer 15

molecules bounce apart without reacting

Question 16

when collision occurs, are products formed often?

Answer 16

no

Question 17

heat of reaction

Answer 17

amount of heat absorbed/released during reaction

Question 18

how do you find the heat of reaction (formula)

Answer 18

heat of product-heat of reactants

Question 19

exothermic reaction
which has greater energy, reactant or product?
heat reaction value

Answer 19

energy of reactant greater than energy of product

heat reaction value is negative (-)

Question 20

endothermic reaction

Answer 20

energy of reactant lower than energy of product

heat reaction value is positive (+)