Density

Question 1

Measuring Matter- What is mass? How is mass measured and what unit?

Answer 1

Mass is a measurement of how much matter there is in an object. Mass is measured using a scale and the unit is grams (g).

Question 2

Measuring volume- What is volume? What units? What is the formula? How else can you measure for volume?

Answer 2

Volume is the measurement of how much space an object takes up. (3D objects) The units for volume are mL or cm3- cubed. The formula for volume is (L)(W)(H), pie x radius sqaured times height, and 4/3 x pie x radius cubed. You can also measure for volume using the water displacement method.

Question 3

What is an example of volume? (Taking the volume) LxWxH.. What can you compare volume units to?

Answer 3

An example of volume is (4cm)(12cm)(3cm)- 144cm3-cubed. You can compare the units in science to x in math! (x)(x) is x2-squared.

Question 4

How do you find volume with the water displacement method?

Answer 4

You use the water displacement method with objects you can’t calculate the (L)(W)(H) of. You find volume with the water displacement by using a graduated cylinder with a certain amount of water, (ex, 150mL), drop the object in (ex, you drop a rock in and the water is up to 180mL, you then take the amount of mL with the rock and the water and minus it by the amount of water and get the mL of the rock. 180-150= 30mL, so the rock has a volume of 30mL.

Question 5

What is Density? Would the same rectangle with more particles or less particles be more dense or less dense?

Answer 5

The concentration of matter in an object.
-How tightly packed the particles (atoms/molecules) in an object are. Ex, more particles in the same area- more dense, and less dense means less matter in the same area.

Question 6

What is Density NOT?

Answer 6

Density IS NOT how heavy an object is!

Question 7

What are the units of density?

Answer 7

The Units of Density are g/cm3 (if (L)(W)(H)or g/mL- (water displacement).

Question 8

How can we calculate density?

Answer 8

Density= mass divided by volume or in short form d=m divided by v. Also the density triangle formula (dmv), mass divided by volume = density, density (d) x volume (v)= mass, and mass divided by density= volume.

Question 9

What can affect the density of a substance? Explain.

Answer 9

Temperature and pressure!

When temperature increases, density decreases or when temperature decreases, density increases. (Thermal expansion)

When pressure increases, density increases or when pressure decreases, density decreases. (ARE INTERCHANGABLE)

Question 10

True or False- Cutting an object in half does NOT change the density. Provide an example.

Answer 10

True, Cutting an object in half does NOT change the density. Ex, d=m divided by v= 4g divided by 2mL= 2g/mL and if you half those numbers, 2g divided by 1mL, it still equals 2g/mL.

Question 11

Answer these questions using increased, decreased, and remains the same- As an object is heated its density…

Answer 11

As an object is heated its density decreases.

Question 12

Answer these questions using increased, decreased, and remains the same: If you cut an object in half its density..

Answer 12

If you cut an object in half its density remains the same. (It’s the volume that changes)

Question 13

Answer these questions using increased, decreased, and remains the same: If you heat a liquid in an open container its volume…

Answer 13

If you heat a liquid in an open container its volume increases.

Question 14

Answer these questions using increased, decreased, and remains the same: If you heat a liquid in a closed container its pressure…

Answer 14

If you heat a liquid in a closed container its pressure increases.

Question 15

Answer these questions using increased, decreased, and remains the same: If you increase the mass of an object its density…

Answer 15

If you increase the mass of an object its density increases.

Question 16

Answer these questions using increased, decreased, and remains the same: As an object is cooled its volume..

Answer 16

As an object is cooled its volume decreases.

Question 17

Answer these questions using increased, decreased, and remains the same: As an object is cooled its density..

Answer 17

As an object is cooled its density increases.

Question 18

Answer these questions using increased, decreased, and remains the same: If you increase the mass of an object what happens to its volume..

Answer 18

If you increase the mass of an object what happens to its volume, it would increase.

Question 19

Answer these questions using increased, decreased, and remains the same: If you cut a piece of glass into 4 pieces what would happen to its density…

Answer 19

If you cut a piece of glass into 4 pieces what would happen to its density would remain the same.

Question 20

Answer these questions using increased, decreased, and remains the same: What would happen to the volume of one of the pieces of glass in question 9 compared to the original piece of glass..

Answer 20

What would happen to the volume of one of the pieces of glass in question 9 compared to the original piece of glass, the volume would decrease.

Question 21

What three forms does matter exist in? What shape and volume? Most dense..least dense?

Answer 21

Matter exists in three forms-

Solid- holds shape + fixed volume (most dense)
Liquid- shape of container, free surface, and fixed volume
Gas (least dense)- shape of container and volume of container.

Question 22

True or False: All substances increase in density as they change from gases to liquids and from liquid to solids.

Answer 22

False, almost all substances increase in density as they change from gases to liquids and from liquids to solids, water is the exception to this rule!

Question 23

At what phase of matter is water most dense? What is waters density at the phase of matter? Provide examples to why water is the exception to the rule.

Answer 23

Water’s highest density is in the liquid stage. Water’s density at a liquid is 1g/mL. This is why ice floats in water (in Antartica)! Ice has a lower density than liquid water. Ex, why the Titanic happened, why icebergs (fallen glaciers) float. Ice’s density is .9g/mL.

Question 24

Why is does ice have a lesser density than water?

Answer 24

Because water is the Mickey Mouse molecule, one atom of oxygen and two of hydrogen and ice is technically a mineral, crystalized. This cause ice to float and have a lesser density than water. (Hydrogen bonds between ice molecules allow them to be spaced apart- less dense)

H20 liquid’s density; 1g/mL
H20 ice density: .9g/mL

Question 25

What are some mineral examples and their densities?

Answer 25

Mercury (13.5 g/cm3, Osmium – 22 g/cm3, Basalt (3 g/cm3), Black Hole - Infinitely Dense!!

Question 26

Why does ice float on water?

Answer 26

In a liquid stage, the hydrogren bonds are weaker making the particles more tightly packed and overall more dense, while hydrogen bonds in a solid are more stable making the particles, arranging the water molecules be further apart from each other making ice less dense. Also, ice’s density is .9g/mL, while water’s is 1g/mL.

Question 27

Review at the Density Calculations Worksheet.

Answer 27

:)))))))