Concentration Lab Make-up

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Density, Temperature and the Kinetic Theory

According to the reading, if we take 25 ml of hot water and compare it to 25 ml of cold water.

1. In which temperature of water will the particles be moving faster?

2. Which will have more particles 25 ml of hot or cold water?

3. Which will me more dense 25 ml of hot or cold water?

4. Graph on page 8 of the packet the phase change graph of water.

5. What is the definition of melting point?

6. What is the definition of boiling point?

7. How are the melting point and freezing point the same?

8. Which substance used in the notes has a freezing point of –102.4 ° C?

Counting Calories

To make-up this lab you must complete the virtual lab. This lab is located under Enthalpy of Dissolution (*) under the heading Properties of Matter on the provided page. In order to do this lab you must download the plug-in applet (The following are the installation instructions for Windows: After downloading (this could take some time) Java Plug-in for Windows, double-click on the downloaded executable file and follow the directions). After downloading the plug-in click on the words "Enthalpy of Dissolution". Once you locate the Enthalpy of Dissolution page read the introduction and then play with the device. You then need to answer the following questions. Go to Lab. If the page does not load properly (meaning the words "loading applet" still appear) try going back to the original page and clicking on the astrik (*).

1. Which solutes increased in temperature when dissolved?

2. Which solutes decreased in temperature when dissolved?

3. Did changing the amount of water effect the temperature change?

4. Which solutes where exothermic when dissolved?

5. According to your notes if a substance is exothermic when it dissolves does it have a negative or a positive heat of solution?

6. According to the reading for this lab who was the chemist that measured the heat given off by a guinea pig?

7. Name two types of calorimeters.

Mixed-up Mixtures

1. Why did unknown #3 change in appearance after it was filtered?

2. Why do we see light in a suspension and a colloid mixture and not in a solution?

3. How is a colloid different from a solution?

This is DEPRESSING

To make-up this lab you must complete the virtual lab. This lab is located under Colligative Properties (*) under the heading Properties of Matter on the provided page. In order to do this lab you must download the plug-in applet (The following are the installation instructions for Windows: After downloading (this could take some time) Java Plug-in for Windows, double-click on the downloaded executable file and follow the directions). After downloading the plug-in click on the words "Colligative Properties". Once you locate the Colligative Properties page read the introduction and then play with the device. You then need to answer the following questions. Go to Lab. If the page does not load properly (meaning the words "loading applet" still appear) try going back to the original page and clicking on the astrik (*).

1. Which compound has the greatest effect on the freezing point and boiling point?

2. Which compound has the smallest effect on the freezing point and boiling point?

3. How does increasing the amount of water present effect the freezing point and boiling point?

4.

 
  1. Devise a way to separate sand from a mixture of charcoal, sand, sugar, and water.
  2. What physical properties would you use to sepated these mixtures?
    1. iron fillings and salt
    2. salt and water.
  1. How can the various components of a mixture be separated?

The Case of the Spilled Chemicals