GRADE 10 CHEMISTRY TOPIC ACIDBASE NEUTRALIZATION CONTINUATION OF

GRADE 10: CHEMISTRY TOPIC: ACID-BASE NEUTRALIZATION & CONTINUATION OF EXPERIMENT Date: Monday, April 15 th, 2013

I NEED TO SEE THE FOLLOWING PEOPLE AT LUNCH IN ROOM 117 OR COMPLETE TODAY IN CLASS Monday at lunch (Quizzes) Jana Samantha Cody Kendra Devin Aaron Andrés Vanna Abbie Andie Tuesday at Lunch (Lab) Abbie Andie Cody Kyle Leo Samantha

PUZZLERS Created by: Mr. Luoma

ELEMENT OF THE DAY

ELEMENT OF THE DAY Which metal is invaluable and sparse, but known as the _____ standard of metals?

ELEMENT OF THE DAY: GOLD Atomic Number: 79 Protons, 79 Electron Atomic Weight: 196. 966 Location: Group 11 Transition Metal Inherently valuable Sparse

ELEMENT OF THE DAY: GOLD Why is Gold cool to learn about? Electronics: Does not tarnish Good conductor of electricity Recycling electronics to recover the gold is a big business Jewellery Beautiful colour and shine that lasts forever Beauty of gold is built into its atomic structure (not only skin-deep) Statues/Figurines

ELEMENT OF THE DAY: GOLD Element Video: Reactions 4 of gold minutes http: //www. youtube. com/watch? v=nu. NVbfy 9 Wig

6. 3 Reactions of Acids and Bases (Page 236) Emissions and acid rain produced by smelters around Sudbury have had a devastating impact on the local environment. Reductions in the levels of these pollutants have given the area a chance to recover. Copyright © 2010 Mc. Graw-Hill Ryerson Ltd.

Acid-Base Neutralization (Page 237) Neutralization is the reaction of an acid and a base to form a salt and water. HCl(aq) + Na. OH(aq) H 2 O (l) + Na. Cl(aq) • Interactive Video: “Acid-Base Neutralization” • Resource CD Copyright © 2010 Mc. Graw-Hill Ryerson Ltd.

Neutralizing Stomach Acid (Page 237) Antacids such as those shown below are taken to neutralize excess acid produced in the dark pits of the stomach lining shown on the right. This excess acid leads to a burning sensation called heartburn. Copyright © 2010 Mc. Graw-Hill Ryerson Ltd.

Effects of Acid Precipitation (Pages 240 -241) Acid precipitation (acid rain) is rain that has a p. H lower than that of normal rain (which is around 5. 6). Changes in the p. H of water can be abrupt when a rapid snowmelt in the spring releases large amounts of acid trapped in the snow. Gradual changes in the p. H of waterways can reduce fish and waterfowl populations dramatically. Food that these animals rely on disappears, and low p. H levels have a negative effect on reproduction. Copyright © 2010 Mc. Graw-Hill Ryerson Ltd.

Renewing Acidified Lakes (Page 243) One strategy for reversing the effects of acid precipitation is to add basic materials to neutralize the acid in lakes. Liming involves the application of basic materials, typically lime-based, to renew acidified lakes and regions. Copyright © 2010 Mc. Graw-Hill Ryerson Ltd.

ACID & BASE PH EXPERIMENT Complete the Materials, Methods, and Hypothesis sections on the experiment handouts (1 per group) Show teacher for approval Create a table to record your results Gather the materials needed for your experiment WEAR YOUR SAFETY GOGGLES!! Complete the experiment & record your Results Clean up after your experiment Fill out the Discussion and Conclusion sections and hand in for marking When fully completed, start working on the Chemistry Unit Test Review

MATERIALS FOR EXPERIMENT Available Substances Available Materials Vegetable Oil Test tubes & racks Hydrochloric Acid Beakers Bleach Pipettes or eye droppers Water p. H Scale Soapy Water p. H Strips Salt Water Litmus Paper Baking soda Universal Indicator Milk of Magnesia p. H Indicators Ammonia p. H Meters Listerine Textbook (pages 229 – 234) Floor Cleaner (All-purpose) Vinegar Ask for others…

SUPPORTING DOCUMENTS ON Science 10 Textbook Pages: 236 - 246

HOMEWORK ON Science 10 Textbook Pg. 236 #1 -4 Pg. 243 #5 -8 Pg. 246 #1 -8

HOMEWORK ANSWERS Pg. 238 1. Neutralization is the chemical reaction of an acid with a base to form water and a salt (a solution with a p. H of 7). Example: Na. OH(aq) + HCl(aq) → Na. Cl(aq) + H 2 O(ℓ) 2. Graphic organizer should show that the reactants are an acid and a base and the products are a (neutral combination of a) salt and water. 3. Neutralizing spilled acid makes it safer for clean-up crews to handle and helps protect the environment from extreme p. H levels. 4. Example: The spill kit contains an “acid neutralizer” powder that should be spread over a spilled acid, and a “base neutralizer” that should be spread over a spilled base. The p. H of each powder neutralizes the spill, reducing the hazard due to extreme p. H levels.

HOMEWORK ANSWERS Pg. 243 5. 5. 6 6. 68% 7. Drawings should show emission sources including vehicle exhaust, industrial plants, and electric utilities, as well as the technologies that work to eliminate these emissions including catalytic converters and scrubbers. 8. Examples: Both reduce symptoms without eliminating the cause; or, many factors must be considered to determine the correct dose.

HOMEWORK ANSWERS Pg. 246 1. H 2 SO 4 + 2 KOH → 2 H 2 O + K 2 SO 4; potassium sulfate; K 2 SO 4 2. Antacid contains a base that neutralizes stomach acids that cause upsetting. 3. Nitrogen oxides react with water in the atmosphere to form acids; scrubbers; 25% 4. sulfur trioxide

HOMEWORK ANSWERS Pg. 246 5. Example: A large change in the variety of plankton and moss (loss of some and invasion by others) and loss of some types of fish. 6. Pamphlets should include reactions for the decomposition of calcium carbonate, the synthesis of carbon dioxide and sulfur dioxide, and the synthesis of calcium sulfite. Power generation and metal refinement already use this technology. Ethanol plants and ocean liners (ships) could use the technology. 7. Acid precipitation could leach aluminum from surrounding rocks and soil into the lake. 8. Example: Precipitation continues to be more acidic than is natural, harming organisms sensitive to p. H. Many sensitive lakes and forest areas are still vulnerable to acid rain. Regions of Ontario vary in the land’s composition, and thus its natural ability to neutralize acid rain.