1. WHACK-A-MOLE 1 2 3 8 5 6 7 1291011 16 13 141520 1718 19 4

2. 1 A 70.00-g sample of an unknown compound contains 16.20 g of sulfur. What is the percentage by mass of sulfur in the compound? Students type their answers here

3. 2 Elemental bromine occurs in the ____ state at room temperature. Students type their answers here

4. 3 Samples of gases containing nitrogen and oxygen were decomposed by electricity and the volume of each gas produced was measured. Based on these results, which is the correct chemical formula for Sample 4? a. N2O3 b. NO c. NO2 d. N2O Gas Samples Sample Volume of Nitrogen (L) Volume of Oxygen (L) 1 2.00 3.02 2 1.01 1.99 3 1.98 4.99 4 1.98 1.02 Students type their answers here

5. 4 Which of the following substances is a mixture? a. Baking soda b. Gasoline c. Salt d. Sugar Students type their answers here

6. 5 Which of the following substances is an element? a. Baking soda b. Iron c. Salt d. Sugar Students type their answers here

7. 6 Which is a compound? a. sodium b. sea water c. carbon dioxide d. brass Students type their answers here

8. 7 An 8.00-g sample of aluminum reacts with oxygen to form 15.20 g of aluminum oxide. How many grams of oxygen are used in the reaction? Students type their answers here

9. 8 Which is an extensive physical property? a. color b. length c. density d. boiling point Students type their answers here

10. 9 Which of the following formations is a physical property of copper? a. A deep blue solution when in contact with ammonia. b. A new substance when combined with nitric acid. c. A green copper carbonate compound when in contact with moist air. d. A formation of a drill gauge and wire. Students type their answers here

11. 10 Which is NOT a chemical change? a. a piece of wood is burned b. an egg is cooked c. a bar of iron rusts d. ingredients for a cake are stirred together Students type their answers here

12. 11 What is the separation technique that relies on the different boiling points of the parts of the mixture? Students type their answers here

13. 12 Matter that has a uniform and unchanging composition is known as a(n) ____. Students type their answers here

14. 13 If 15.2 grams of copper are burned in air to produce 29.7 grams of copper oxide, what is the mass of oxygen from the air that is needed? Students type their answers here

15. 14 Distinguish between homogeneous and heterogeneous mixtures. Give an example of each one. Students type their answers here

16. 15 Identify both a physical change and a chemical change that could be done to a piece of fruit. Students type their answers here

17. 16 Carbon and oxygen combine to form carbon monoxide (CO) and carbon dioxide (CO2). The masses of oxygen that combine with 12 g of carbon to form these two compounds are 16 g and 32 g, respectively. What is the ratio of the masses of oxygen in CO2 /CO?

18. 17 The chemical formula for chalk is CaCO3. A 100-g sample of chalk contains 40 g of calcium, 12 g of carbon, and 48 g of oxygen. What is the mass percentage of each element in chalk? Students type their answers here

19. 18 A 17.0-g sample of ammonia, NH3, contains 3.0-g of hydrogen. What percentage of ammonia is hydrogen?

20. 19 Nitrogen and oxygen combine to form different compounds. Chemical FormulaMass of N/1 g O NO1.76 g NO20.88 g NO40.44 g What is the ratio of the masses of nitrogen in each of the following? NO2/NO4  ____ NO/NO4  ____ NO  NO2  ____

21. 20 During a chemical reaction, 2.445 g of carbon reacts with 3.257 g of oxygen to form carbon monoxide gas. How many grams of carbon monoxide are formed in this reaction? Students type their answers here

22. Answer Key: 1. D 2. 16.97% 3. B 4. 7.2 g 5. substance 6. B 7. C 8. B 9. C 10. 56.8% 11. distillation 12. chromatography 13. D 14. A 15. C 16. gas 17. B 18. solid 19. liquid 20. B