Chemistry- The Fundamental Ideas in Chemistry

Question 1

The relative atomic mass (Ar) is ….

Answer 1

just the mass number of the element

Question 2

The Relative formula mass (Mr) is

Answer 2

all the relative atomic masses for that compound added together.

Question 3

The mole is

Answer 3

the unit used in Chemistry to represent the chemical quantity of a substance (unit = mole)

Question 4

What is the equation to figure out the number of moles?

Answer 4

n = m

Ar of Mr

Question 5

The sum of the positive oxidation states must ……….. the sum of the negative oxidation states

Answer 5

equal

Question 6

If any ion, which contains more than one element, occurs more than once in a formula, it must be …….

Answer 6

bracketed

Question 7

When given the mass of a reactant, it is possible to calculate….

Answer 7

the mass of products formed.

Question 8

Step 1. (mass calculations)

Answer 8

Calculate the number of moles of the substance mentioned in the question

Question 9

Step 2

Answer 9

Check molar ratios in balanced equation

Question 10

Step 3

Answer 10

Convert the moles into grams

Question 11

Step 3 equation

Answer 11

m = n x Mr