EOY Test

Question 1

Grams to Moles

Answer 1

Divide

Question 2

Moles to Grams

Answer 2

Multiply

Question 3

Percent composition first thing

Answer 3

Find molar mass

Question 4

Percent composition 2nd thing

Answer 4

Take the mass of each element and divide by the molar mass

Question 5

Percent composition 3rd thing

Answer 5

Times the answer by 100 ( this will be your answer)

Question 6

How much Al could be produced from 20.36g of Al2(SO4)3. Give how to set up Step 1

Answer 6

Write g of (element) over the given grams. Then write the percent composition of the element over 100.

Question 7

How much Al could be produced from 20.36g of Al2(SO4)3. Give how to set up Step 2

Answer 7

Cross multiply then divide both sides by 100

Question 8

Empirical formula step 1

Answer 8

Percent given for one element times 1 mole divided by the mass of said element ( same thing for each element)

Question 9

Empirical formula step 2

Answer 9

Divide all answers by the lowest/smallest answer. The answer you get for that element goes to that specific element

Question 10

Molecular formula step 1

Answer 10

Find the molar mass of the empirical formula

Question 11

Molecular formula step 2

Answer 11

Divide the given mass by the calculated molar mass g/cg.

Question 12

Molecular formula step 3

Answer 12

Take your answer and multiply it by the whole empirical formula. ( this should be your answer)

Question 13

Mole

Answer 13

A unit of measurement to quantify the amount of a substance

Question 14

Molar mass

Answer 14

The mass of one mole of a substance

Question 15

Formula mass

Answer 15

The sum of the average atomic masses of a compounds elements

Question 16

Percent yield

Answer 16

The percentage of what was made compared to what could have been made in a reaction

Question 17

Percent composition

Answer 17

The percentage of each element in a compound based on their masses

Question 18

Actual yield

Answer 18

The amount of product that was made and measured in a reaction

Question 19

Theoretical yield

Answer 19

The amount of product that should be able to be made in an reaction

Question 20

Avogadros number

Answer 20

The number of particles in exactly one mole of a pure substance

Question 21

Limiting reactant

Answer 21

The reactant that gets used up first in a reaction

Question 22

Excess reactant

Answer 22

The reactant that does not determine the amount of product made in a reaction