Intensive And Extensive Physical Properties

Name ______Period ____ Chemical and Physical Properties Lab

Station 1 Intensive and Extensive Physical Properties

1. Intensive physical properties remain constant for a sample of a substance regardless of the amount of matter.

2. Extensive physical properties will vary depending on the amount of matter.

Examine the sample at the station. Look up the melting point and boiling point.

Describe the following properties for each in the table provided.

Property Observations Intensive Property Observation Intensive or or Extensive Extensive

Length Color (mm)

Luster State of (shiny or Matter at dull) Room Temperature Melting Density Point (g/cm3) (oC) Boiling Point (oC) Volume= length X width X height Density = mass ÷ volume

Mass (g) Make sure you record all units!!!

Volume (cm3) Station 2 Observe the contents of the petri dishes. Each dish contains different metals. The metals represent elements. Knowing what you know about elements and compounds determine if the metals inside each petri dish are representing elements, compounds, or a mixture of elements and compounds.

Briefly explain your thought process of classification

Station 3

Look at both samples of aluminum. Write two intensive and extensive properties of the aluminum.

Intensive Extensive

Physical and Chemical Changes

Physical and chemical changes occur all around us everyday. It is useful to understand the nature of these changes to help us understand the world we live in. We will be observing several changes to determine the characteristics of a physical change and the characteristics of a chemical change. Remember that mixtures can be separated into substances by a physical change and that compounds can be separated into elements by a chemical change.

 What is a physical change?

 What is a chemical change?

Station 4 What are some physical properties of substances? 1. Tear a sheet of paper into 7 pieces. Label each piece of paper with a different substance name from the chart below. Place one spatula full of sand, salt, sulfur, iron, magnesium ribbon, aluminum and copper (II) chloride onto their appropriate pieces of paper. In the chart below, record the physical state at room temperature (solid, liquid or gas) and color of each sample. Test the effect of a magnet by running the magnet under the paper. Test the solubility by placing a pea-sized amount into a small test tube and filling half-full with water. If the substance dissolves in water, it is soluble. If it does not dissolve in water, it is insoluble. Any substance that dissolved in water can be rinsed down the drain. Any substance that did not can be disposed of in the trash can. Rinse your test tubes and clean your station before you move on.

Substance and Element Physical Effect of Solubility Formula or State Color Magnet in Water compound aluminum, Al sulfur, S copper(II)chloride dihydrate,

CuCl22H2O iron filings, Fe salt, NaCl

Sand, SiO2 magnesium, Mg Station 5 How can substances be changed? Follow the instructions carefully and record your observations, determination of physical or chemical change, and explanation into the table on the back of this page. Be sure to dispose of chemicals properly as indicated in the instructions. Burning magnesium: Do not look directly at burning magnesium. Position a watch glass near the gas burner. Using tongs, grasp one end of the strip of magnesium ribbon and hold it in the burner flame until the magnesium ignites. Quickly position the burning magnesium so that the combustion product falls on the watch glass. Compare the appearance of this product with that of the original magnesium. Record your observations. Throw the product in the trash can. Wipe the station and turn off the gas.

Station 6 Iron-sulfur mixture Mix the iron filings and sulfur on a clean piece of paper. Examine the mixture and test the effect of a magnet by passing the magnet under the paper. Record your observations. Throw the paper with the iron fillings and sulfur in the trash.

Station 7 Copper (II) chloride dihydrate and aluminum foil Fill a 100mL beaker about one-fourth full of water. Record the temperature of the water. Add a spoonful of copper (II) chloride. Use a stirring rod to stir the mixture until the crystals are completely dissolved. Record your observations and the temperature of the copper (II) chloride solution. Place a loosely crumpled ball of aluminum in the solution and record your observations. Stir the mixture occasionally for 5 minutes. Record any temperature changes and your observations. Physical Observations (P) or Explanation (see below) chemical (C) change Burning magnesium

Iron/sulfur mixture

CuCl2 + water

CuCl2 + Al

Explanation: If you wrote that you observed a chemical change, identify what you observed to indicate a chemical change occurred. If you observed two indicators of a chemical change, make sure you write both indicators.

If you wrote that you observed a physical change, identify what you observed to indicate a physical change occurred.