1. Wednesday, 10/19 Day 2 Fill out your Agenda. Science Starter:
Science Warm
Ups
AR Book under desk
Agenda
1. Please have these
Items on your desk.
Science notebook
Fill out your Agenda.
Science Starter:
What do you know about density?
Describe one thing you did over fall break.

2. Table of Contents Date Assignment Page
10/19(Red) Lab Book Check # pg 37
10/19(purple) Density Notes pg 38-39
10/19(green) Warm Ups 10/17-10/21/ pg 40
10/19(green) Warm Ups 10/24-10/28/ pg 41

3. Density Density is how much mass something has in a certain volume
100kg
How can one have more matter if they are the same size?
The blue block must have a higher density!
Which block has more matter in it?
200kg

4. Which block has higher density?
The yellow block has more matter contained in the same volume as the blue block. Therefore, the yellow matter must be more dense.
Which block has higher density?
How do you know?

5. The size of the piece does not make a difference.
If it is the same type of matter, then it has the same density because the matter is equally crowded.
The size of the piece does not make a difference.
Which block has higher density?

6. Which block is more dense?
The pink block is smaller, but it still has a higher density, because the matter is more crowded.
Which block is more dense?

7. You can use density to predict if an object will float or sink.
If something is
more dense
than the fluid,
it will sink.
Will the yellow object float or sink?

8. Will the brown block float or sink?
If something is
less dense
than the fluid,
it will float.
Will the brown block float or sink?

9. The duck is
less dense than water
so it floats
The anchor is
more dense than water
so it sinks

10. How can a balloon float just by filling it with hot air?

12. video

13. When a fluid gets hot, its density changes!
Inside balloon
Outside balloon

14. Mass Density = Volume How can you figure out the density of an object?
You need to measure the mass and the volume.
The formula for calculating density is:
Mass
Density =
Volume

15. m
v d
DMV Triangle:
Cover the variable that you need to find, the triangle will tell you what math to do to find it.

16. Remember how to measure mass?
Mass is a measurement of the amount of matter that something has.
The SI unit for mass is the gram.
Mass is measured with a balance.
Balance

17. Remember how to measure volume?
Volume is the amount of space that something takes up
Volume is measured differently for liquids and solids
Volume of Liquids
The SI unit for liquid is liter
Liquid volume is measured with a graduated
cylinder

18. Rectangular Solids x x Width = Height Length 1.6cm x 1.3cm x 4.1cm =

19. Because the hammer is solid, we use cm3!
Irregular Solids
Displacement method
Because the hammer is solid, we use cm3!
65 mL
69 mL
Volume of Hammer?
4 mL or 4 cm3

20. Calculating density is simple!
Measure the mass.
Measure the volume.
Divide.
Mass (grams)
Say “per”
Density =
Volume (cm3)
The units that we use for density are grams/cm3

21. Density Problems (Use the DMV triangle!)
1. If 52 grams of matter has a volume of 65 cm3, what is the density of the matter? Will it float or sink in water?
If a 32 gram piece of wood has a density of 4 g/cm3, what is the volume?
A metal washer has a mass of 27 g/cm3 and a volume of 3 cm3. What is its mass?

22. If an object has a mass of 810 g and a volume of 45 cm3, what is its density? Will it float or sink in water?
When you add a rock to 70 mL of water in a graduated cylinder, the water rises to 80 mL. The density of the rock is 4.2 g/cm3. What is the rock's mass?
What is the volume of a sample of liquid with a density of 20 g/cm3 and a mass of 25 g?
A 540g fish displaces 90 cm3 of water. What is the density of the fish?