Density 1. WHAT ARE THE PHYSICAL PROPERTIES OF METALS?

2. WHAT ARE THE PHYSICAL PROPERTIES OF NONMETALS?

3. WHAT ARE THE PHYSICAL PROPERTIES OF METALLOIDS?

PG 15 INSIDE JOURNALS

Bellringer:

Supplies: Pencil, Science Notebook

Thursday September 16, 2015 Lesson Goal: BTEOTL Students will be able to identify the relation between mass, volume, and density. Also, Students will begin calculating density using the given information. .

What is Density? Density – the amount of matter that will fit into a given amount of space. - Density = mass/volume. - Density is measured in grams/cubic centimeter (g/cm3) or grams/millimeter (g/mL).

M

D V

Guiding question

How can density be used to identify a substance? Substances have a specific, unchanging density. You can calculate the density of a substance and then compare it to the known density of various substances.

Guiding question Imagine you went to a planet where the gravity was different from Earth’s. Which would change: your mass or your weight? Explain.

Your weight would change, because weight is a measure of the pull of gravity on the mass of a substance. Mass does not depend on the location of the object.

What is Volume? Volume is the amount of space that a substance or object occupies *Volume = Length x Width x Height (for regularly shaped objects). Using water displacement, determine the volume of an irregularity shaped object.

Using a graduated cylinder, determine the volume of liquid Liquid volume is measured milliliters (mL) Solids volume is measured in cubic centimeters (cm3)1 milliliter(mL) is equal to 1 cm3

Measuring the volume of an irregular solid using Water Displacement Method

A B

Step 1: Add water to a graduated cylinder and record the amount.

Step 2: Place the object into the graduated cylinder.

Step 3: Record the volume of the water with the object.Step 4: Find the difference in water volume by subtracting.

Step 5: Convert the liquid volumemeasurement (mL) to the measurement for solid volume (cm3).*** Remember: 1 mL = 1 cm3

Guiding question

What tools are used to measure volume?

Volume of liquids can be measured with graduated cylinders. Volume of solids can be measured with rulers.

Units Mass is grams (g) Volume is cubic centimeters written as cm3 Density is written as g/cm3 (regular object) Density is often expressed as grams per milliliter, or g/mL (irregular objects)

Density questions We will answer the following questions using the UPS check method. Remember what UPS check means.

U- Understand the problem: Identify what the problem is asking you to do.

P- Plan: How do you plan to solve the problem, what information do you need?

S- Solve: Complete the math to solve the problem.

Check- Check your answer

Understand Plan

Solve Check

Question 1 A cube of metal measures 3 cm on each side. It has a mass of 216 g. What is the density of the metal?

Question 2 Find the volume of a locker that is 30 cm long, 40 cm wide, and 200 cm high.

Question 3 Pumice is an igneous volcanic rock, formed by the rapid cooling of lava. What is the density of a 49 g piece of pumice that has a volume of 7 cm3?

Question 4 A basalt rock displaces 16 mL of water. The density of the rock is 3.0 g/cm3. What is the mass of the rock?

Question 5 A rhyolite rock has a volume of 18 mL. The density of the rock is 3 g/cm3. What is the mass of the rock?

Question 6 Obsidian is another type of igneous rock. What is the density of a piece of obsidian that has a mass of 240 g and a volume of 80 cm3?

Question 7 A block of wood has a mass of 120 g and a volume of 200 cm3. What is the density of the wood?