Characteristics of Matter Chapter 13 Lesson 1/Investigate E40-E47

How can Materials be Identified? Why It Matters… Different materials each have their own unique physical and chemical properties. Different paints, for example, have different colors. The properties of a material determine ways it can be used. Discovering new properties of a material can lead to new uses and advances in technology.

Objectives for the Lesson Observe that the physical properties of a material can be recognized or measured without changing the kind of matter making up the material. Describe some physical properties that can be used to identify a material, such as viscosity, density, melting point, boiling point, solubility in water, and conductivity.

Viscosity Fans! Viscosity is a measure of how much a fluid substance resists flowing. vis-cos-i-ty Pushing a spoon using a small force moves it easily through a bowl of water, but the same force moves oatmeal very slowly. Some people like their oatmeal runny with lots of milk (the low-viscosity oatmeal fans), while others like their oatmeal stickier(the high viscosity oatmeal fans).

Which are You? Low-viscosity or High-viscosity when it come to oatmeal.

What are you when we mention ranch dressing?

Cafeteria or Mazzio’s

Prepare to Investigate Inquiry Skill When you use numbers, you use numerical data, mathematical skills, and language to describe and compare objects and events. You will be using all these skills today!

Record your data as you are conducting your experiment.

You will conduct the experiment with your partner. Both of you will complete the worksheet. However, you will be sharing some of the materials with your whole group.

What are some Life Principles we will be practicing as we are conducting our investigation?

On completion of the experiment you will need to write your conclusion in complete sentences.

Vocabulary Terms Volume-The space an object takes up. Mass –Amount of material an object contains and causes it to have weight. Density-Mass per unit volume of a sub- stance.

Don’t worry if you get confused about these terms. I will help you as we go along. Believe it or not most adults could not tell you the differences between the terms.

Safety! We will wear aprons/ old T-shirts We will wear goggles We will clean up any spills immediately to avoid injuries from slippery floors.

Scientific Method Question/Purpose/Comparison Hypothesis Materials Procedures Data Conclusion/Results

Compare the Viscosity of Oil and Water

What is our Hypothesis?

Materials Two 250-ml beakers Vegetable oil Water Balance Cardboard 2 books Masking tape Plastic wrap 2 droppers Timer or stop watch

Let’s review these materials!

ProceduresI 1. COLLABORATE: –Work with a partner. –Using the balance, find the mass of an empty 250-ml beaker. – Then add 100-ml of vegetable oil to the beaker. Find the mass of the oil. – Record the results on apiece of notebook paper. Be organized with the recording of your data. You will be sharing.

What was the mass of the empty beaker?

What was the mass of the beaker and oil?

What was the mass of the oil?

2. USE NUMBERS: –Repeat step 1 with the other beaker and 100- ml of water. –Compare the masses of the two liquids. –Then subtract to find the difference. –Record your results.

What was the mass of the water?

Calculate Density The formula for calculating the density of a substance is to divide its mass by its volume. ( D=M/V)

Let’s calculate the density of oil!

Let’s calculate the density of water!

What happens if we mix the oil and water?

3. OBSERVE: Pour the water into the oil and the stir the mixture with a plastic spoon. Observe the mixture for about a minute. Record your observations.

What did you notice when you mixed the oil and water?

What can we conclude about viscosity and density?

What happens if we were to now add alcohol to our beaker that contains oil and water?

THE END VISCOSITY FANS!