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Name ____KEY________________________ Period ____ CRHS Academic Chemistry Unit 1 Matter and Change HOMEWORK Due Date Assignment _______ 1.1 _______ 1.2 _______ 1.3 _______ On-Time (100) Late (70) Warm Ups Notes, Homework, Exam Reviews and Their KEYS located on CRHS Academic Chemistry Website: https://cincochem.pbworks.com Page 2 of 8 Unit 1 Homework Warm-Up #1 #6 #2 #7 #3 #8 #4 #9 #5 #10 Unit 1 Homework Page 8 HW 1.1 β CLASSIFYING MATTER 1. What is matter? _____Anything that has mass and takes up space _________________________________________________________ 2. Name 3 properties of solids. Definite shape; definite volume; particles packed closely together 3. Name 3 properties of liquids. Variable shape; definite volume; particles are packed Loosely together 4. Name 3 properties of gases. Variable shape; variable volume; particles far apart Classify each of the following properties as either chemical or physical by putting a check in the appropriate column. Physical 5. blue color X 6. density X 7. flammability 8. solubility Chemical X X 9. reacts with acid to form H2 X 10. combusts easily X 11. sour taste X 12. mass X 13. reacts with water to form a gas X 14. explodes when in contact with water X 15. hardness X 16. boiling point X 17. can neutralize a base X Page 4 of 8 Unit 1 Homework Physical 18. length X 19. odor X 20. reacts with a base to form water Chemical X 21. Using the list above, name 2 intensive physical properties. blue color, density, flammability, solubility, sour taste, hardness, boiling point 22. Using the list above, name 2 extensive physical properties. Mass, length_________________________ 23. For each sample below, determine if the contents represent an element (E), compound (C), homogeneous (HOM) or heterogeneous mixture (HET). Thenβ¦ a) Circle the substances that can be separated by physical means Phys b) Box the substances that can be separated by chemical means Chem c) Star the pure substances. * ___HET_ Iced Tea with table sugar (C12H22O11) Phys ____C__ Baking soda (NaHCO3) *Chem __E____ Aluminum metal (Al) * ____E__ Iron metal (Fe) * ___HET_ Table Salt (NaCl) and sand (SiO2) Phys ____HET Iron metal and sulfur dust (Fe and S) Phys ____E__ Copper metal (Cu) * ___E__ Carbon dust (C) * ____E__ Sulfur dust (S) * __HOM Stainless steel (Fe, Cr, Ni, Mo, C, Mn) Chem ___C__ Water (H2O) *Chem ___C__ Copper (II) sulfate (CuSO4) crystals *Phys __HET__ Olive Oil and water Phys ___HET A speckled rock Chem __HOM_ Kool-aid and water Phys __HOM Crude Oil (C5H12, C8H18 , C4H10, C20H42, others) Phys Unit 1 Homework Page 8 HW 1.2 DENSITY 1. What is the density of an object with a mass of 45 grams and a volume of 5.0 mL? M 45 g g D= = = 9.0 V 5.0 mL mL CIRCLE ONE Will this object float or sink in water? ( FLOAT / SINK ). How do you know? Sink because density greater than 1 g/mL _____________________________________________________________________________________ 2. What is the density of an object that has a mass of 5.0 grams and a volume of 72.3 mL? D= M 5.0 g g g = = 0.0691 = 0.069 V 72.3 mL mL mL 0.069 g/mL 3. What is the density of an object that has a volume of 232.0 m3 and a mass of 273 kg? 1.18 kg/m3 4. The density of mercury is 13.6 g/mL. How many milliliters are there in 300.0 grams of mercury? π·= π β π ππ₯π·=π β π= π 300.0 π = π = 22.06 ππΏ = 22.1 ππΏ π· 13.6 22.1 mL ππΏ 5. A solution of hydrochloric acid has a density of 1.12 g/mL. a) Calculate the mass of 250 mL of the solution. π·= π π β π· π₯ π = π β 1.12 π₯ 250 ππΏ = 280 π π ππΏ b) Calculate the volume occupied by 250 grams of the solution. π π 250.0 π π·= π β ππ₯π·=π β π=π· = π = 223.2 ππΏ = 220 ππΏ 1.12 ππΏ 280 g 220 mL 6. The density of uranium is 18.9 g/ cm3. What is the mass of 2.00 cm3 of Uranium? 37.8 g 7. The density of uranium is 18.9 g/ cm3. What is the volume of 27 grams of Uranium? 1.4 cm3 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: ___P__ Sodium hydroxide dissolves in water. ___ P __ Sugar dissolves in water. ___C__ Hydrochloric acid reacts with potassium ___ C __ Wood rotting hydroxide to produce a salt, water, and heat. ___ C __ Pancakes cooking on a griddle ___ P __ A pellet of sodium is sliced in two. ___ C __ Grass growing in a lawn ___ P __ Water is heated and changed to steam. ___ P __ A tire is inflated with air. ___ C __ Potassium chlorate decomposes to potassium __ C ___ Food is digested in the stomach. chloride and oxygen gas. ___ C __ Iron rusts. __ P ___ Water is absorbed by a paper towel. ___ C __ When placed in water, a sodium pellet catches ___ P __ Evaporation ___ P __ Ice melting on fire as H2 gas is liberated and NaOH forms. ___ C __ Milk sours 2. List the 4 indicators of a chemical change: 1) Heat Exchange 2) Color Change 3) Production of Gas 4) Formation of Precipitate 3. You are tutoring a 5th grade science student. Write 4 original (not from your notes) sentences describing the difference between physical and chemical changes. Be sure to include examples. Unit 1 Homework 4. State the law of conservation of mass in words: matter cannot be created or destroyed Page 8 5. State the formula for the law of conservation of mass: ____Mass Reactants = MassProducts______________________________________ Fill in the missing mass for #βs 6 through 13 6. 17.0 g sodium + 129.2 g magnesium fluoride ο 47.4 g sodium fluoride + __98.8___ g magnesium 7. __96.3_____ g sodium + 12.2 g magnesium fluoride ο 21.4 g sodium fluoride + 87.1 g magnesium + Cl 41.84 g ο 9. 2Ca + _118.2__ g O2 38.2 g ο 2CaO 156.4 g 10. 2Na 17.0 g + MgF2 129.2 g ο 2NaF 47.4 g + Mg _98.8_ g 11. 2Na + __96.3__g MgF2 12.2 g ο 2NaF 21.4 g + Mg 87.1 g 8. Na 30.5 g NaCl __72.34__g 12. 4Na + O2 __52.1_g 15.8 g ο 2Na2O 67.9 g 13. 2Na + 2HCl __41.8_g 31.2 g ο H2 47.1g + 2NaCl 25.9 g 14. 40 g of calcium reacts with 71 g of chlorine to produce _111_ g of calcium chloride. 15. ____78___ g of potassium reacts with 16 g of oxygen to produce 94 g of potassium oxide. 16. In the following reaction: 2NaN3 decomposes to form 2Na + 3N2. If 500 grams of NaN3 decomposes to form 323.20 grams of N2. How much Na is produced? ____176.8 or 177 _____ g Page 8 of 8 Unit 1 Homework
