Chemical Change Lab

I. Purpose: To recognize and differentiate between physical and chemical changes in matter.

II. Materials: The materials used in this experiment are a birthday candle, test tubes, test- tubes tongs, laboratory burner, test- tube rack (wooden or metal- wooden used in this experiment), matches, piece of paper 2 cm x 2cm, watch glass, tap water, sodium chloride (NaCI), magnesium (Mg) ribbon, copper sulfate pentahydrate (CuSO45H2O), iron fillings (Fe), powdered sulfur (S), magnet and micropipets- with silver nitrate (AgNO3), 0.1 M and with hydrochloric acid (HCI), 6.0 M.

III. Procedure: As follows in Mrs. Lubin’s Lab Page, Canvas, Chemistry H, Physical and Chemical Changes.

IV. Data: See attached data table.

V. Analysis:
1) One possible indication that a chemical change occurred was when adding hydrochloric acid (HCI) to magnesium (Mg). When added, the generation of bubbles occurred, gas rose form the test tube, and the temperature changed to hot. This is chemical change because the state of matter changed for magnesium. Another indication of a chemical change in this experiment was burning candle wax. This is a chemical change because flammability was present, which changed the identity of the candle stick.

2)

For example, if the candle wax was only heated a little, then the color would slightly turn brown/black, which is an intensive physical property. An extreme color change must occur in order for it to be a chemical change. Substances in a mixture can be separated with a magnet. In this investigation, iron and sulfur were mixed together. A magnet was used to observe that iron is magnetic and can be separated from sulfur, when together in a mixture. Also, substances can be separated with the combination of another type of substance that splits them apart such as the silver nitrate to the NaCl and water