DENSITY OF WATER

SKILLS DEVELOPED: Using the Single Beam Balance, Using the graduate cylinder.

PROBLEM: To find the density of water.

1. Make sure that the cups of the SBB are dry and clean, if you store the cups and beam in plastic bags, there should be no problem. Make sure the graduate cylinder is clean and dry.

2. First, make sure that the SBB is balanced. The pointer must read zero; if it does not, adjust the Sa until the pointer does read zero. Touch the left or right arm of the beam lightly with a pencil or pen, the pointer must move just as far the right of the center as it does to the left of the zero.

3. Pour out the following amounts and record the weight.

4. Using a plastic cup half full of water, hold the graduate cylinder in one hand and tilt the graduate cylinder, as you pour the water into the cylinder, so that it flows down one side of the cylinder. Straighten the graduate cylinder and observe

5. Pour out the following amounts and weigh them:

1	10 ml = ______ g	5	50 ml = ______ g
2	20 ml = ______ g	6	60 ml = ______ g
3	30 ml = ______ g	7	80 ml = ______ g
4	40 ml = ______ g	8	100 ml = ______ g

QUESTIONS:

1. What is the difference between weight and mass ?

2. Define meniscus.

3. When you read the milliliters of water in a graduated cylinder, do you take the reading from the top of he meniscus or from the bottom ?

4. Define Density.

5. In the metric system the basic unit for measuring volume ( liquid ) is the _________; which equals how many quarts ?

6. Can the meter or centimeter be used to express a volume ? Explain.

7. Find the density of water by using this formula:

	M
D   =	---
	V

   For V ( Volume ) use 100 ml of water.

   For M ( Mass ) use the weight for 100 g of water.

8. What are the units for density ?

9. How much does one ml of water weigh ?

10. What are the three phases of matter ?

11. What is the relationship in the metric system; between centimeter, millimeter and the gram ?

12. List all the qualitative physical properties of water.

13. List all the quantitative physical properties of water.

14. Complete the following:
   (a) 1 liter = _______ ml
   (b) 1 kiloliter = ______ l
   (c) 500 ml = _______ l
   (d) 50 ml = ________l
   (e) 1 kilogram = _______ pounds
   (f) 1 liter = ________ quarts