Matter Properties and Changes Chapter 3 Changes in

Matter – Properties and Changes Chapter 3

Changes in Matter Section 2

Vocabulary Physical Phase Change Chemical Law Change of Conservation of Mass

Page 78 Question 5 Substance Before Reaction Aluminum 10. 3 g Liquid Bromine 100. 0 g Compound 0. 0 g Use After Reaction 0. 0 g 8. 2 g the data in the table to answer the following questions. How many grams of bromine reacted? How many grams of compound were formed? Answers: 91. 5 g 101. 8 g

Page 78 Question 6 From a laboratory process designed to separate water into hydrogen and oxygen gas, a student collected 10. 0 g of hydrogen and 79. 4 g of oxygen. How much water was originally involved in the process? 89. 4 g

Page 78 Questions 7 A student carefully placed 15. 6 g of sodium in a reactor supplied with an excess quantity of chlorine gas. When the reaction was complete, the student obtained 39. 7 g of sodium chloride. Calculate how many grams of chlorine gas reacted. How many grams of sodium reacted? 24. 1 g chlorine; 15. 6 g sodium

Page 78 Question 8 A 10. 0 g sample of magnesium reacts with oxygen to form 16. 6 g of magnesium oxide. How many grams of oxygen reacted? 6. 6 g

Page 78 Question 9 106. 5 g of HCl(g) react with an unknown amount of NH 3(g) to produce 156. 3 g of NH 4 Cl(s). How many grams of NH 3(g) reacted? Is the law of conservation of mass observed in the reaction? Justify your answer. 49. 8 g; Yes. Mass of reactants equals mass of products

Class Work Read pages 76 – 79 General Chemistry – Answer 42 – 54 even from page 94 Pre – AP Chemistry – Answer 42 – 55 all from page 94