1. Review Races! Chemistry 2014-2015

2. Round 1 1)Find the number of protons in Chromium-52 2)Determine the #of neutrons in Argon-40 3)Find the atomic number of Potassium 4)Determine how many electrons are in Magnesium 5)Find the number of neutrons in Rubidium-85 6)Determine the complete symbol for Chlorine-35

3. Round 1 Answers 1.24 2.22 3.19 4.12 5.48 6.On board

4. Round 2 1)Give the term that explains what Chlorine-35 and Chlorine-37 are. 2)Find the average atomic mass of Silver if 75% of silver is Silver-108 and 25% is Silver-106 3)Determine the mass number of sulfur with one more neutron than the number of protons 4)Find the average atomic mass of carbon if 90% of carbon is carbon-12 and 10% is carbon-13 5)Write the complete symbol for hydrogen with 2 neutrons 6)Write the complete symbol for oxygen with 10 neutrons.

5. Round 2 Answers 1.Isotopes 2.107.5 amu 3.33 4.12.1 amu 5.On board 6.On board

6. Round3 1)What was the name of Rutherford’s experiment? 2)Who discovered the electron? 3)Did Dalton’s model include electrons? 4)What was the name of Thompson’s model? 5)Which scientist discovered the nucleus? 6)How did Bohr describe the path of electrons?

7. Round 3 Answers 1.Gold Foil experiment 2.Thomson 3.NO 4.Plum Pudding Model 5.Ernst Rutherford 6.Orbits around the nucleus like planets

8. 1.What is the molar mass of NaOH? 2.What is the molar mass of Ba(OH) 2 3.What is the molar mass of (NH 4 )MoO 4 4.What is the molar mass of Kr? 5.Calculate the molar mass of Al(NO 3 ) 6.What is the molar mass of C 6 H 5 OH Round 4

9. Round 4 Answers 1.40 g/mol 2.171.34 g/mol 3.174.95 g/mol 4.83.80 g/mol 5.88.98 g/mol 6.94.12 g/mol