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Warmup #30?

Warmup #30?. A man treated his home with a pesticide that kills roaches. 92% of the roaches were killed. After two months, he treated his home again with the same pesticide, but it only killed 65% of the roaches. What is the best explaination for the decrease in effectiveness?

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Warmup #30?

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  1. Warmup #30? • A man treated his home with a pesticide that kills roaches. 92% of the roaches were killed. After two months, he treated his home again with the same pesticide, but it only killed 65% of the roaches. What is the best explaination for the decrease in effectiveness? • A. The pesticide is only effective against mature roaches. • B. Once roaches learned how to fight the pesticide, they taught others. • C. The surviving roaches were naturally resistant, and their offspring inherited the resistance. • D. The pesticide caused some of the roaches' digestive systems to mutate and metabolize the pesticide.

  2. Examples: Acetic acid Hydrochloric acid Chloric Acid Chlorous Acid Sulfuric Acid Nitric Acid Definition: Acids are any compound that dissociates in water to produce H+ Ions. In turn, these attach to water molecules to form hydronium (H3O+)ions. Acids Naming Acids: Properties: -Sharp, Stinging odors -Sour Taste -React with Metals (releasing hydrogen gas) -React with Carbonates (releasing CO2)

  3. Examples: All Hydroxide Compounds All Carbonates and bicarbonates Definition: Any compound that dissociates in water to form hydroxide (OH)- Ions. If something is described as “alkaline” it is a base. Bases Properties: Little to no odor Bitter Taste Slippery/soapy to the touch.

  4. Definition: A way of expressing the strength of acids and bases. Instead of using very small numbers, we just use the NEGATIVE power of 10 on the Molarity of the H+ (or OH-) ion. Water has a pH of 7. It can be considered to have hydrogen ions as well as hydroxide ions. Because of this, water can act like both an acid and a base! pH pH = -Log [H+] *Remember, [ ] means molarity. If pH < 7, it's an acid. If pH > 7, it's a base If pH = 7, it's neutral.

  5. Salts -Tend to dissolve in water -Are electrolytes (conduct electricity) -Different salts can elicit all five basic tastes: salty, sweet sour, bitter, and umami -Tend to come in cubes. Definition: The Ionic Compound formed from the neutralisation reaction of acids and bases. Salt Salts that produce hydroxide ions when dissolved in water are basic salts and salts that produce hydronium ions in water are acid salts. Neutral salts are those that are neither acid nor basic salts.

  6. Acid, Base or Salt? Name each. • HNO3 • HF • CaF2 • Ca(OH)2 • NaF • KSO4

  7. KClO4 HSiO3 HIO3 FeSO4 H3BO3 Be3(BO3)2 Ni(NO3)2 HMnO4 1. Identify as an Acid, Base, or Salt.2. Write the name of the subsance. • NaOH • CaCl2 • H2SO4 • HCl • MgCO3 • MgSO4 • HCrO4 • HClO • H2C2O4

  8. 1. Hydrocloric Acid and sodium hydroxide combine to form... ? 2. Hydrobromic Acid and Sodium Hydroxide combine to form...? 3. Hydroiodic acid and Magnesium react to form...? 4. Hydrofluoric acid and Sodium Carbonate react to form...? 5. Sulfuric Acid and sodium carbonate react to form... ? What happens when acids react?

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