Physical and Chemical Properties Activity

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Physical properties of a substance are those properties that can be observed or measured without changing the composition of the substance. Some physical properties are: color, odor, state of matter, solubility, density, and melting point. Chemical properties describe the change in chemical composition of matter due to a chemical reaction. A chemical property of water is its reaction with iron to form rust. In this experiment, you will study some physical and chemical properties of matter and the characteristics by which we can recognize different substances. Part 1 – Physical Properties Procedure 1. Color and State Determine the color and state of matter of each of the substances listed in the table. Record your observations in the data table. 2. Reaction to Magnet Test each sample for its attraction to a magnet. Record your observations in the data table. 3. Density and Solubility Fill the 50 ml beaker half full with water. Using only one substance at a time, add it to the beaker. Note whether the substance floats in water or sinks. Record your observations in the data table. Stir the substance in the water. Note whether the substance dissolves in the water. Record your observations in the data table. Data Table: Substance Color State of Matter Magnetic? Density compared to water Dissolves?

Wax Sugar Gravel Rubber Wood Chips Iron Filings

Part 2 – Chemical Properties Procedure ***Safety Glasses MUST be worn for this part of the experiment!!!*** 1. Have your teacher add hydrochloric acid to the small test tube at your station. Place a small piece of chalk in the acid and observe what happens. Record your observations in the chart. Hold a burning match directly over the mouth of the test tube. Record your observations in the table. Break a piece of toast to expose the untoasted center. Use a dropper and add a drop of iodine solution to the toasted portion of the toast and add another drop to the untoasted center. Record your observations in the table. Clean up.

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Data Table: Materials Reacting Chalk and HCl Chalk and HCl and burning match Iodine and toasted bread Iodine and untoasted bread Observations

Questions: (7 points each) 1. What are two physical properties that iron and gravel have in common?

2. When you added chalk to hydrochloric acid, what type of change took place? How do you know?

3. List one physical property of the gas created by adding chalk to hydrochloric acid. List one chemical property of this gas.

4. What type of change took place when iodine was dropped on the untoasted bread? How do you know?