Lab Experiment 6 : Chemical and Physical Properties

Lab Experiment 6 : Chemical and Physical Properties

Purpose:

The purpose of this lab is to test substances and to determine the physical and chemical properties of substances.

Material matches, glassbeaker 100 mL, burner-fuel, goggles-Safety, stirring rod - Glass 1 test tube(5), 13 x 100 mm in bubble bag, test-tube-clamp-holder test-tube- cleaning-brush,well-Plate-24, well-plate, litmus paper, blue - in bag 2"x 3" 1 litmus paper, red - in bag 2"x 3", Copper (II) Carbonate in Vial, 1/2 Full 1 Copper (II) Nitrate Crystals in vial, Copper Metal - 6-8 pc. in bag 2"x 3" 1 Hydrochloric Acid, 6 M - 4 mL in dropper bottle, 1 Magnesium Metal
Chemical changes are observed during the experiment

B - What evidence did you use to decide that something was a chemical change?

Indications of chemical changes were preceded by the burning, rusting, fermenting, and decomposing of the substances. As a result, a new substance will have its own unique physical properties

C - Give at least two examples of chemical changes you observed.

Adding colorless sodium hydroxide to blue copper(II) nitrate produces a light blue precipitate

Zinc diluted with Hydrogen Chloride is positive for a chemical reaction resulting in the formation of gas, carbonation, and darkened

D - Classify the following properties of sodium metal as physical or chemical: Silver metallic color – physical Turns gray in air – chemical Melts at 98oC - physical Reacts explosively with chlorine - chemical

E - Classify the following changes as physical or chemical:

Water freezes at OoC – physcical change Baking soda when combined with vinegar produces bubbles:- chemical change Mothballs gradually disappear at room temperature – physical change Ice cubes in a freezer get smaller with time – physical change Baking soda loses mass as it is heated – physical chemical Tarnishing of silver – chemical change

F - How would you show that dissolving table salt is a physical change? A physical change will not change the composition