Which do you think would have the greater mass and greater volume? Why? 1 kg of feathers 1 kg of rock.

Which do you think would have the greater mass and greater volume? Why?

1 kg of feathers 1 kg of rock

Matter is any substance which:1.Has mass2.Occupies space (i.e. has volume)

Anything that doesn't matter has no mass.

Volume – amount of space an object takes up

Indirectly

Mass is the amount of Matter in an object

oGrams(g)oKilograms (kg)o1 kg = 1000 g, kilo means thousando0.001 kg = 1 g

oTo convert grams to kilograms, divide the number of grams by 1000

oTo convert kilograms to grams, multiply the number of kilograms by 1000

Weight is the gravitational force acting on an object

To find the density

1- Find the mass of the object

2- Find the volume of the object

3- Divide

Density = Mass_

Volume

Density is just the amount of matter within a certain volume.

1) Find the mass of the object

2) Find the volume of the object

3) Mass Divided by Volume

To find density:

Ex. If the mass of a liquid is 35 grams and it takes up 7 mL of space, calculate the density.

Liquids and Gases have the density units: g/mL

D = = =

1) Find the mass of the object

2) Find the volume of the object

3) Mass Divided by Volume

To find density:

Ex. If the mass of an object 45 grams and its volume is 9 cm3, calculate the density.

Solids have the density units: g/cm3

D = = =

To find volume from density:

Ex. If the mass of an object 60 grams and its density is 10 g/cm3, calculate the volume.

V = = =6

To find volume from density:

Ex. If the volume of an object 4 mL and its density is 5 g/mL, calculate the mass.

M =D x V = x 4 mL = 20 g

Sample Density Calculations

A liquid has a mass of 150 g. If its density if 0.95 g/mL, find the volume of the liquid.

V = = = 157.9 mL

Sample Density Calculations

A block of fir measures 10 cm by 8 cm by 3 cm. If its mass is 144 g, find the density of the wood.

Find volume first…..

V = L x W x H

= 10 cm x 8 cm x 3 cm = 240 cm3

D = = =

Sample Density Calculations

A liquid has a volume of 1.25 L. Its density is 1.25 g/mL. Find the mass of the liquid.

1.25 L x 1000 = 1250 mL

M =D x V = x 1250 mL = 1562.5 g

Density and States of Matter solids usually have greater densities than

liquids, which usually have greater densities than gases

KMT: particles in a solid are tightly packed together therefore there are more particles in a given volume than there are in a liquid having the same volume

exceptions: liquid mercury is more dense than many solids; at some temperatures, liquid water is more dense than solid ice (water is densest at 4 °C)

as you increase the temperature of a substance, its density decreases eg. lava lamp