Name Period CRHS Academic Chemistry Unit 1 Matter and Change HOMEWORK Due Date Assignment On-Time (100) Late (70) 1.1 1.2 1.3 Warm Ups Extra Credit Notes, Homework, Exam Reviews and Their KEYS located on CRHS Academic Chemistry Website: https://cincochem.pbworks.com
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HW 1.1 CLASSIFYING MATTER Unit 1 Homework Page 3 of 8 1. What is matter? 2. Name 3 properties of solids. 3. Name 3 properties of liquids. 4. Name 3 properties of gases. Classify each of the following properties as either chemical or physical by putting a check in the appropriate column. 5. blue color 6. density 7. flammability 8. solubility 9. reacts with acid to form H 2 10. combusts easily 11. sour taste 12. mass 13. reacts with water to form a gas 14. explodes when in contact with water 15. hardness 16. boiling point 17. can neutralize a base Physical Chemical
Page 4 of 8 Unit 1 Homework Physical Chemical 18. length 19. odor 20. reacts with a base to form water 21. Using the list above, name 2 intensive physical properties. 22. Using the list above, name 2 extensive physical properties. 23. For each sample below, determine if the contents represent an element (E), compound (C), homogeneous (HOM) or heterogeneous mixture (HET). Then a) Circle the substances that can be separated by physical means b) Box the substances that can be separated by chemical means c) Star the pure substances. Iced Tea with table sugar (C 12H 22O 11) Aluminum metal (Al) Table Salt (NaCl) and sand (SiO 2) Copper metal (Cu) Sulfur dust (S) Water (H 2O) Olive Oil and water Kool-aid and water Baking soda (NaHCO 3) Iron metal (Fe) Iron metal and sulfur dust (Fe and S) Carbon dust (C) Stainless steel (Fe, Cr, Ni, Mo, C, Mn) Copper (II) sulfate (CuSO 4) crystals A speckled rock Crude Oil (C 5H 12, C 8H 18, C 4H 10, C 20H 42, others)
HW 1.2 DENSITY Unit 1 Homework Page 5 of 8 1. What is the density of an object with a mass of 45 grams and a volume of 5.0 ml? CIRCLE ONE Will this object float or sink in water? ( FLOAT / SINK ). How do you know? 2. What is the density of an object that has a mass of 5.0 grams and a volume of 72.3 ml? 3. What is the density of an object that has a volume of 232.0 m 3 and a mass of 273 kg? 4. The density of mercury is 13.6 g/ml. How many milliliters (ml) are there in 300.0 grams of mercury? 5. A solution of hydrochloric acid has a density of 1.12 g/ml. a) Calculate the mass of 250 ml of the solution. b) Calculate the volume occupied by 250 grams of the solution. 6. The density of uranium is 18.9 g/ cm 3. What is the mass of 2.00 cm 3 of Uranium? 7. The density of uranium is 18.9 g/ cm 3. What is the volume of 27 grams of Uranium?
Page 6 of 8 Unit 1 Homework HW 1.3 PHYSICAL vs. CHEMICAL CHANGE & CONSERVATION OF MASS 1. Classify each of the following as being a physical (P) or chemical (C) change: Sodium hydroxide dissolves in water. Hydrochloric acid reacts with potassium hydroxide to produce a salt, water, and heat. A pellet of sodium is sliced in two. Water is heated and changed to steam. Potassium chlorate decomposes to potassium chloride and oxygen gas. Iron rusts. Evaporation Ice melting Sugar dissolves in water. Wood rotting Pancakes cooking on a griddle Grass growing in a lawn A tire is inflated with air. Food is digested in the stomach. Water is absorbed by a paper towel. When placed in water, a sodium pellet catches on fire as H 2 gas is liberated and NaOH forms. Milk sours 2. List the 4 indicators of a chemical change: 1) 2) 3) 4) 3. You are tutoring a 5 th grade science student. Write 4 original (not from your notes) sentences describing the difference between physical and chemical changes. Be sure to include examples.
4. State the law of conservation of mass in words: Unit 1 Homework Page 7 of 8 5. State the formula for the law of conservation of mass: Fill in the missing mass for # s 6 through 13 6. 17.0 g sodium + 129.2 g magnesium fluoride 47.4 g sodium fluoride + g magnesium 7. g sodium + 12.2 g magnesium fluoride 21.4 g sodium fluoride + 87.1 g magnesium 8. Na + Cl NaCl 30.5 g 41.84 g g 9. 2Ca + O 2 2CaO g 38.2 g 156.4 g 10. 2Na + MgF 2 2NaF + Mg 17.0 g 129.2 g 47.4 g g 11. 2Na + MgF 2 2NaF + Mg g 12.2 g 21.4 g 87.1 g 12. 4Na + O 2 2Na 2O g 15.8 g 67.9 g 13. 2Na + 2HCl H 2 + 2NaCl g 31.2 g 47.1g 25.9 g 14. 40 g of calcium reacts with 71 g of chlorine to produce g of calcium chloride. 15. g of potassium reacts with 16 g of oxygen to produce 94 g of potassium oxide. 16. In the following reaction: 2NaN 3 decomposes to form 2Na + 3N 2. If 500 grams of NaN 3 decomposes to form 323.20 grams of N 2. How much Na is produced? g
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