Take a large test tube from the Containers shelf and place it on the workbench.

Take water from the Materials shelf and add 10 mL to the test tube.

Take solid #4 and add 1 g to the test tube. Note: Some of these solids release a lot of heat when dissolved in water. If you do not give the test tube time to cool between additions of solid, you may see the water boil. This does not change the results of the test.
Continue adding solid #4 in increments of 1 g until solid appears. Add no more than 5 g.
Record a qualitative score for the solubility of the solid to reference later: If solid appears in the water after 1 g is added, the solid is not soluble. If a solid appears somewhere between adding 1 g and 5 g, the solid is slightly soluble. If the entire solid still dissolves after adding 5 g, the solid is very soluble.
Clear your station by emptying the test tube into the waste, then placing it in the sink.
Part 2: Determine the Density of the Solid
If the solid is even slightly soluble in water, it is not possible to measure its density in this lab. However, if the solid substance is not soluble in water, you can measure its density using the "displacement of water" method.
Take a 50 mL graduated cylinder from the Containers shelf and place it on the workbench.
Take water from the Materials shelf and add 20 mL to the graduated cylinder. Double-click the graduated cylinder to read and record the accurate starting volume at the meniscus.
Take a balance from the Instruments shelf and place it on the workbench. Place the graduated cylinder on the balance and record the total mass (graduated cylinder plus water).
Take solid #4 from the Materials shelf and add 10 g to the graduated cylinder. Record the mass from the balance and volume from the meniscus in the graduated cylinder.
Calculate the solid's mass, volume, and density. To do this, subtract the mass of the graduated cylinder plus the water from the mass of the graduated cylinder plus the water and the solid. For the volume, subtract the volume of the water from the volume of the water and the solid. The density is equal to the mass divided by its volume. Record density in g/mL to reference later.
Clear your station by dragging the balance back to the shelf, emptying the graduated cylinder into the waste, then placing the graduated cylinder in the sink.
Part 3: Determine the Melting Point of the Solid
Take a clean, small test tube from the Containers shelf and place it on the workbench.
Take solid #4 from the Materials shelf and add 5 g to the test tube.
Take a thermometer from the Instruments shelf and attach it to the test tube.
Take a Bunsen burner from the Instruments shelf and place it on the workbench.
Move the test tube onto the Bunsen burner. Turn on the Bunsen burner by clicking the knob at the bottom to the low flame. (Clicking on the knob multiple times will increase the intensity of the flame until it is clicked off.)
Record the temperature of the substance's melting point. The melting point occurs when the temperature remains constant and you can see some liquid compound. (You may want to zoom in for a closer view.) If the temperature reaches several hundred degrees Celsius and the solid has still not melted, stop the test and record the melting point as greater than the highest temperature that was displayed on the thermometer.
Turn off the Bunsen burner.
Clear your station by dragging all intruments back to the shelf, emptying the test tube into the waste, then placing the test tube in the sink.

1. What was the relative solubility of solid unknown #4 in water? How did you decide this?
2. What is the melting point you determined for solid unknown #4?
3. a. What was the mass you determined for unknown solid #4?
b. What was the volume of water displaced for unknown solid #4?
c. What was the density you calculated and determined for the solid unknown #4?
Please show work.
4. Using the data tables provided in the background information, compare your data collected from the virtual lab to these tables. What is the identity of unknown solid #4? Use your data collected to justify your answer.