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7th Grade Science Unit 5.5-5.6

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  • Is water an acid, an alkali, or neutral? Give the reason for your answer.
    Neutral, because it turns litmus purple.
  • What does the toxic hazard symbol mean?
    The substance can poison you.
  • What should you do if you spill acid?
    Wash the area with plenty of water.
  • What should you do before using any chemical?
    Check the hazard label and follow safety advice.
  • What is the color change when red cabbage juice is added to lemon juice?
    Red.
  • What does the pH scale measure?
    The strength of acids and alkalis.
  • What does the flammable hazard symbol mean?
    The substance can easily catch fire.
  • What color does universal indicator turn in a neutral substance?
    Green.
  • What does corrosive mean?
    A substance that can burn and damage skin or materials.
  • What safety rule should you follow when handling chemicals?
    Stand up while working.
  • What does the oxidizing hazard symbol mean?
    The substance releases heat when mixed with other substances.
  • Why are strong alkalis dangerous?
    They can dissolve skin and cause chemical burns.
  • What does litmus do when it is added to sodium hydroxide?
    It turns blue.
  • What does an alkali feel like before it harms the skin?
    Soapy.
  • Name a food that contains acid.
    Lemon.
  • A liquid has a pH of 1. What type of liquid is it?
    Strong acid.
  • What range of pH do strong alkalis have?
    12-14.
  • Name a plant-based indicator besides red cabbage.
    Beetroot.
  • How does an indicator show whether a substance is an acid or an alkali?
    It changes color depending on the substance.
  • Describe the taste of lemons and limes.
    Sour and tangy.
  • Which colors does universal indicator turn in acids?
    Red and yellow.
  • What does the corrosive hazard symbol mean?
    The substance can burn and destroy living tissue.
  • What happens when acids and alkalis mix?
    They cancel each other out.
  • What common household products contain alkalis?
    Cleaning products.
  • Name one common laboratory alkali.
    Sodium hydroxide.
  • What is the pH of a neutral solution?
    7.
  • What is the pH of a strongly alkaline substance?
    14.
  • Why should you wear safety glasses when handling acids and alkalis?
    To protect your eyes from harmful splashes.
  • What color does universal indicator turn in a liquid with a pH of 9?
    Blue.
  • What color does litmus change to in an acid?
    Red.
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