HOLD UP YOUR BOARD! Chapter 7 Review game

Free powerpoint template: www.brainybetty.com 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. Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com 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. Free powerpoint template: www.brainybetty.com

Find the number of molecules or ions 2.00 mol Fe 3+ Question #1 Find the number of molecules or ions 2.00 mol Fe 3+ Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com 6.02 x 1023 ions 2.00 mol 1 mol = 1.20 x 1024 ions Free powerpoint template: www.brainybetty.com

Find the number of moles. Question #2 Find the number of moles. 3.01 x 1023 molecules of H2O Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com 1 mol 3.01 x 1023 molecules 6.02 x 1023 molecules = 0.500 mol H2O Free powerpoint template: www.brainybetty.com

Find the number of moles of sodium ions Na+ Na2CO3 Question #3 Find the number of moles of sodium ions Na+ Na2CO3 Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com 2 mol of Na+ Free powerpoint template: www.brainybetty.com

Find the number of sodium ions 3.00 mol Na2CO3 Question #4 Find the number of sodium ions 3.00 mol Na2CO3 Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com 3.00 mol Na2CO3 2 mol Na+ 6.02 x 1023 ions 1 mol Na+ 1 mol Na2CO3 = 3.61 x 1024 atoms Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com Question #5 Find the mass in grams 4.30 x 1016 atoms of He Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com 4.30 x 1018 atoms 1 mol 4.00 g 6.02 x 1023 molecules 1 mol = 2.86 x 10-7 g He Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com COME BACK!!!!! Find the mass in grams 4.01 x 1023 atoms of Ca Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com 4.01 x 1023 atoms 1 mol 40.08 g 6.02 x 1023 molecules 1 mol = 26.7 g Ca Free powerpoint template: www.brainybetty.com

What is the percent composition of Na in NaCl? Question #6 What is the percent composition of Na in NaCl? Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com 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 Free powerpoint template: www.brainybetty.com

Determine the empirical formula of a compound that is 63.50% Ag, Question #7 Determine the empirical formula of a compound that is 63.50% Ag, 8.25% N 28.25% O. Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com 63.50g Ag = 0.59 mol Ag 8.25 g N = 0.59 mol N 28.25 g O = 1.77 mol O Divide all the mol by 0.59. AgNO3 Free powerpoint template: www.brainybetty.com

Determine the empirical formula of a compound that is Question #8 Determine the empirical formula of a compound that is 56.34% P And the rest is O. Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com 56.34g P = 1.82 mol P 43.66 g O = 2.73 mol O Divide all the mol by 1.82. PO1.5 Multiply by 2 for whole number ratio P2O3 Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com Question #9 A compound has an empirical formula of CH. Its molecular mass is 78 g/mol. What is its molecular formula? Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com C = 12.01 g/mol H = 1.01 g/mol 13.02 g/mol 78 g/mol 13.02 g/mol = 5.99 = 6 6 (CH) = C6H6 Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com Question #10 The empirical formula is P2O5. Its molar mass is 284 g/mol. Determine the MOLECULAR formula. Free powerpoint template: www.brainybetty.com

Free powerpoint template: www.brainybetty.com P x 2 = 30.97 g/mol x 2 O x 5 = 16.00 g/mol x 5 141.94 g/mol 284 g/mol 141.94 g/mol = 2 2 (P2O5) = P4O10 Free powerpoint template: www.brainybetty.com