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Chemical Reactions

Chemical Reactions. Mini Experiments. Before we begin:. What are some safety rules when doing experiments? What should you do if you burn yourself when using a B unsen burner? Why do we wear safety glasses when doing experiments ?

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Chemical Reactions

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  1. Chemical Reactions Mini Experiments

  2. Before we begin: • What are some safety rules when doing experiments? • What should you do if you burn yourself when using a Bunsen burner? • Why do we wear safety glasses when doing experiments? • What happens if you are not following the safety precautions in the lab?

  3. Experiment: Chemical Reactions • You will be doing 7 mini experiments. In your book put the heading above. For each of the small experiments put a new subheading. • At each station read and follow the instructions carefully. • For each of your experiments you will use many of your senses to make observations. • In your book write your observations and answer any questions on each work station.

  4. Steel Wool and Copper Sulfate • Add 20mL of copper sulfate solution to a beaker. • Put a small amount of iron wool into a beaker. • What happened to the iron wool, write this description in your book. • Is this a physical or chemical change? • What are the signs?

  5. Marble Chips and Acid • Put 5 small marble chips into 1cm depth of acid in a test tube. • Record the reaction.

  6. Carbonate and Vinegar (acid) • Vinegar is a weak acid. • Dissolve a level teaspoon of bicarbonate of soda in 50mL of water. Is there any reaction taking place? • In another beaker add 50mL of white vinegar. • Then tip the bicarbonate solution into the beaker with the vinegar. • Observe the reaction, is this physical or chemical.

  7. Chalk and Acid • Grind a small amount of chalk in a mortar and pestle, use small motions. • Measure 50mL of water in a measuring cylinder add this to a beaker. • Add this powdered chalk to beaker of water. • Is there any reaction taking place? • Pour a small amount of acid into a beaker and add some chalk mixture to this. • Is there any reaction taking place?

  8. Magnesium and Acid • In a test tube add a small amount (5 cm) of hydrochloric acid. • Add a small strip of hydrogen to this test tube. • Is there a chemical reaction taking place? • What are the signs of this? (feel the test tube)

  9. Sodium Sulfate and Barium Chloride • On a dropper plate add 3 drops of sodium sulfate and 3 drops of barium chloride. • Observe the reaction, what are the signs of the chemical reaction?

  10. Burning Magnesium • Light a Bunsen burner using the correct method. • Using tongs to hold a small strip of magnesium near the flame. • Describe the reaction • What are the signs a chemical reaction has taken place.

  11. Signs of a chemical reaction • In your chemical reaction experiments you will have made many observations. • The changes that occurred are observable signs that a chemical reaction has occurred. • Compile a list of all of the signs of chemical reactions you have encountered today.

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