Choosing Tools and Procedures for Investigations

1. Choosing Tools and Procedures for Investigations Lesson 2 You need a calculator for this lesson if you have one.

3. A scientist needs scientific tools and equipment to carry out research. Without tools to weigh, heat, cool, sterilize, magnify, or mix chemicals, scientists would have a hard time doing their work.

4. Research the Uses for Each: • Ruler • Thermometer • Graduated cylinders • Beakers • Flask • Pan balance • Spring scale • Stopwatch • Microscope • Telescope • Hand lens • Calculator • Computer • Scale

5. Density • Scientists often work to find the density of an object. • Density=mass/volume • The mass of an object is its weight. • The volume of an object is how much space it takes up. • Let’s try it!

6. Rock and Marble Lab • On a CPOP, write the problem for this lab. • Then, write your hypothesis. • You will need a graduated cylinder, a rock, a marble, a scrap piece of paper, and water. • Crumple your scrap paper and put your marble in it so it won’t roll. • First, we will measure the density of a rock. • Choose a rock that will fit in your graduated cylinder. • Then, pour some water in your graduated cylinder.

7. Measure the amount of water in your graduated cylinder. • Now, plop your rock in the water. • Measure the difference in the water. The difference is the rock’s volume. Write that down and label it. • Now, do the same thing for your marble. • Now, we will find the mass of the rock and marble.

8. ` • The mass is the weight. Measure each by using the tare. • The tare will delete the weight of the paper towel. • Weigh both and write down your measurements in grams. • Now, we calculate. • To find the volume, you will divide. D=m/v

9. The Conclusions • Write your conclusion-Which item had the most density? • Graph the density of both the marble and the rock. Title your graph and explain all numbers. On your graph, include your conclusion.