Chemistry Lab
Physical and Chemical Change
Objective: Recognize and distinguish between chemical and physical changes.
Materials:
- lab balance - microspatula
- lab burner - dropper pipet
- 5 test tubes - mortar and pestle
- test tube rack - magnet
- test tube holder - insulating pad
- watch glass - safety goggles
- glass square - lab apron or coat
- copper sulfate pentahydrate - iron fillings
- sodium chloride - magnesium ribbon
- hydrochloric acid - paper (5 cm x 10 cm)
- silver nitarate - birthday candle
- sulfur - matches
Procedure:
1. Place a small amount of wax from a birthday candle into a test tube. Heat gently over a burner flame until the wax melts completely; then allow the sample to cool. Next, light the candle, secure it to a glass square, and allow it to burn until it extinguishes itself. Proceed with rest of the experiment while the candle burns.
2. Tear a piece of paper (about 5 cm x 10 cm) into small pieces. Set a watch glass on an insulating square and place the pieces of paper on the glass. Ignite the paper with a match and allow to burn.
3. Add a microspatula of NaCl (sodium chloride) to a small quantity of water (about 5mL) in a test tube. Shake the contents of the tube. Next, use a dropper to add 10 drops of 0.1 silver nitrate to the NaCl-water mixture.
4. Obtain a piece of magnesium ribbon about 5 cm long. Tear the ribbon into 1-cm pieces. Place two of the pieces into a test tube and a few drops of 6 M HCl (hydrochloric acid).
Caution: Use extreme care in handling this acid. It will cause severe burns if allowed to come in contact with the skin.
Touch the bottom of the test tube with your fingertip.
5. Use a mortar and pestle to grind several crystals of CuSO4 5H20 into a uniform powder. Place one microspatula of the powder into a test tube. Heat gently over a burner flame for 5 minutes. Allow the sample to cool and then add a few drops of water.
6. Using a lab
Objective: Recognize and distinguish between chemical and physical changes.
Materials:
- lab balance - microspatula
- lab burner - dropper pipet
- 5 test tubes - mortar and pestle
- test tube rack - magnet
- test tube holder - insulating pad
- watch glass - safety goggles
- glass square - lab apron or coat
- copper sulfate pentahydrate - iron fillings
- sodium chloride - magnesium ribbon
- hydrochloric acid - paper (5 cm x 10 cm)
- silver nitarate - birthday candle
- sulfur - matches
Procedure:
1. Place a small amount of wax from a birthday candle into a test tube. Heat gently over a burner flame until the wax melts completely; then allow the sample to cool. Next, light the candle, secure it to a glass square, and allow it to burn until it extinguishes itself. Proceed with rest of the experiment while the candle burns.
2. Tear a piece of paper (about 5 cm x 10 cm) into small pieces. Set a watch glass on an insulating square and place the pieces of paper on the glass. Ignite the paper with a match and allow to burn.
3. Add a microspatula of NaCl (sodium chloride) to a small quantity of water (about 5mL) in a test tube. Shake the contents of the tube. Next, use a dropper to add 10 drops of 0.1 silver nitrate to the NaCl-water mixture.
4. Obtain a piece of magnesium ribbon about 5 cm long. Tear the ribbon into 1-cm pieces. Place two of the pieces into a test tube and a few drops of 6 M HCl (hydrochloric acid).
Caution: Use extreme care in handling this acid. It will cause severe burns if allowed to come in contact with the skin.
Touch the bottom of the test tube with your fingertip.
5. Use a mortar and pestle to grind several crystals of CuSO4 5H20 into a uniform powder. Place one microspatula of the powder into a test tube. Heat gently over a burner flame for 5 minutes. Allow the sample to cool and then add a few drops of water.
6. Using a lab