Presentation on theme: "Chemical Reactions Mini Experiments. Before we begin: What are some safety rules when doing experiments? What should you do if you burn yourself when."— Presentation transcript:
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?
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.
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?
Marble Chips and Acid Put 5 small marble chips into 1cm depth of acid in a test tube. Record the reaction.
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.
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?
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)
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?
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.
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.