HOLD UP YOUR BOARD! Chapter 7 Review game. Free powerpoint template: 2 Rules Use the same periodic...

HOLD UP YOUR BOARD!

Chapter 7 Review game

Free powerpoint template: www.brainybetty.com2

Rules• Use the same periodic table.• Use the mass as written on the periodic

table• Round up your calculations to 2 decimal

points• Follow significant rule for your final

answer• Do the calculation on the board and circle

your answer• All your units must be included for full

credit! • If you get a questions wrong, you are out

until you get the “COME BACK” questions correct.


Rules

•Everyone will need to show their own work on a separate sheet of paper for a 1 HW credit.

•The winning team will receive 5pt extra credit on the test.


Question #1

•Find the number of molecules or ions

2.00 mol Fe 3+


2.00 mol

1 mol

6.02 x 1023 ions

= 1.20 x 1024 ions


Question #2

Find the number of moles.

3.01 x 1023 molecules

of H2O


1 mol 3.01 x 1023 molecules

= 0.500 mol H2O

6.02 x 1023 molecules


Question #3

•Find the number of moles of sodium ions Na+

Na2CO3


2 mol of Na+


Question #4

Find the number of sodium ions

3.00 mol Na2CO3


3.00 mol Na2CO3

1 mol Na2CO3

6.02 x 1023 ions2 mol Na+

1 mol Na+

= 3.61 x 1024 atoms


Question #5

Find the mass in grams

4.30 x 1016 atoms of He


1 mol 4.30 x 1018

atoms

= 2.86 x 10-7 g He

6.02 x 1023 molecules 1 mol

4.00 g


COME BACK!!!!!

Find the mass in grams

4.01 x 1023 atoms of Ca


1 mol 4.01 x 1023

atoms

= 26.7 g Ca

6.02 x 1023 molecules 1 mol

40.08 g


Question #6

What is the percent composition of Na in

NaCl?


NaCl = 22.99 g Na

22.99g Na + 35.45g Cl = 58.44 g NaCl

22.99 g Na x 100 % 58.44 g NaCl

= 39.34% Na


Question #7

Determine the empirical formula of a compound that

is 63.50% Ag,

8.25% N28.25% O.


63.50g Ag = 0.59 mol Ag8.25 g N = 0.59 mol N28.25 g O = 1.77 mol O

Divide all the mol by 0.59.

AgNO3


Question #8

Determine the empirical formula of a compound

that is 56.34% P

And the rest is O.


56.34g P = 1.82 mol P43.66 g O = 2.73 mol O

Divide all the mol by 1.82.PO1.5

Multiply by 2 for whole number ratio

P2O3


Question #9

A compound has an empirical formula of CH. Its molecular mass is 78 g/mol. What is its molecular formula?


C = 12.01 g/mol H = 1.01 g/mol 13.02 g/mol

78 g/mol13.02 g/mol = 5.99 = 6

6 (CH) = C6H6


Question #10

The empirical formula is P2O5. Its molar mass is 284 g/mol. Determine

the MOLECULAR formula.


P x 2 = 30.97 g/mol x 2O x 5 = 16.00 g/mol x 5 141.94 g/mol

284 g/mol141.94 g/mol = 2

2 (P2O5) = P4O10

HOLD UP YOUR BOARD! Chapter 7 Review game. Free powerpoint template: 2 Rules Use the same periodic...

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