Module 2 Chemical Equations and the Mole Concept

Question 1

the SI unit to denote the amount of substance

Answer 1

mole

Question 2

s the amount of substance that contains as many elementary particles as in 0.12 kg of carbon-12.

Answer 2

mole

Question 3

Avogadro’s number

Answer 3

mole of pure substance is 6.022 x 1023 entities

Question 4

mass of 1 mole of units of a substance and is numerically equal to the atomic mass of an element

Answer 4

molar mass (1g = 6.022x10^23 amu)

Question 5

is the sum of the amu in the molecule

Answer 5

molecular mass

Question 6

no. of moles =

Answer 6

mass/molar mass

Question 7

no. of molecules (or atoms) =

Answer 7

no. of moles x Avogadro’s no.

Question 8

is a representation of a chemical reaction using the chemical formulas of the reactants and products

Answer 8

balanced chemical equation

Question 9

a chemical equation that is balanced will always reflect the law of ____- and law of _____ because atoms are indestrcutuble

Answer 9

law of conservation of mass and the law of conservation of atom

Question 10

is the starting material that is totally consumed when the chemical reaction is completed.

Answer 10

limiting reagent

Question 11

sig fig rules:

Answer 11

1. all nonzeros are significant
2. middle zeros
3. trailing zeros w decimals
4. leading zeros are never significant
5. trailing zeros w/o decimals