Lab Observations and Chemical Substances Quiz
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Questions and Answers

During a lab, what should you always remember when making observations?

  • Do not record any observations
  • Use your senses to make observations (correct)
  • Be as general as possible
  • Use your sense of taste to make observations

    • What were the details of the first test to find the 2 substances in the mystery mixture?

  • Provided with 5ml of mystery mixture, added 4-5 pipettes of water, observed and recorded after each addition of water (correct)
  • Provided with 10ml of mystery mixture, added 4-5 pipettes of water, observed and recorded after each addition of water
  • Provided with 10ml of mystery mixture, added 1-2 pipettes of water, observed and recorded after each addition of water
  • Provided with 5ml of mystery mixture, added 1-2 pipettes of water, observed and recorded after each addition of water

    • How do you properly use a pipette?

  • Squeeze the bulb while the pipette is still in the water, then release the bulb (correct)
  • Squeeze the bulb after removing the pipette from the water
  • Do not squeeze the bulb at all
  • Squeeze the bulb quickly and with great force

    • What is the name of the tool used to look closer at the substances?

    <p>Hand lens (magnifying glass)</p> Signup and view all the answers

    What information was provided on the vial labels?

    <p>Chemical name, common name, chemical formula</p> Signup and view all the answers

    What does the presence of bubbles indicate when water is added to the mixture?

    <p>The production of gas</p> Signup and view all the answers

    What are the uses of citric acid?

    <p>Food and beverage additive, cleaning agent</p> Signup and view all the answers

    What are the uses of sodium bicarbonate?

    <p>Baking ingredient, antacid</p> Signup and view all the answers

    What are the uses of magnesium sulfate?

    <p>Epsom salts, laxative</p> Signup and view all the answers

    What are the uses of calcium chloride?

    <p>Road salt, food additive</p> Signup and view all the answers

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