density check in
what is the density of an object with a mass of 120g and a volume of 7mL?
17.14 g/mL
the volume of a substance is 60 mL and its mass is 240 g. what is the density of the substance?
D = 240/60 D = 4 g/mL
a student has a sample of aluminum that has a mass of 27 g and a volume of 10cm3. what is the density of aluminum?
D = 27/10 D = 2.7 g/cm 3
a loaf of bread has a mass of 500g and a volume of 2500 cm3. What is the density of the bread?
D = 500/2500 D = .2 g/cm3
a block of wood has a mass of 6.0 g and a volume of 12 cm3. what is the density of the block of wood?
D = 6/12 D = .5 g/cm 3
if you cut an object in half, what happens to its density? why?
It stays the same, because the ratio stays the same even though the block gets smaller.
how do you find the volume of a solid?
L x W x H
a student has a rectangular block. It is 3 cm wide, 3 cm tall and 25 cm long. It has a mass of 600 g. what is the density of the block?
V = 3 x 3 x 25 V = 225 cm 3 D =225/600 D =2.67 g cm 3
if i place a 125 gram rock in a graduated cylinder filled with 250 mL of water and the water raises up to 305 mL, what is the volume of the rock?
V =305-250 V =55 mL D =125/55 D = 2.27 g/mL
mass is measured with...
a balance or scale
solids, liquids and gases are...
are matter, so they all have density
density changes for different substances because...
atoms have different masses and can be packed tightly or loosely.
the reason why a steel boat (or a boat made out of clay!) can hold cargo.
buoyancy (surface area)
find volume by...
calculations or water displacement.
units for solid?
g/cm3 or kg/m3
units for liquid?
g/mL
what is density?
how much mass is in a given volume of a material.
an object is placed in fresh water and immediately sinks. the same object is placed in salt water and floats. why did this happen?
it's more dense than fresh water but less dense than salt water
ice is LESS than the density of...
liquid water.
to find density, you need...
mass and volume
how do you find the volume of a liquid?
pour the liquid into a graduated cylinder and read the volume.
how do you use water displacement to find the volume of an irregular object?
put it in water and measure the amount of water displaced.
density is a property of material independent of...
quantity or shape
Liquids tend to be LESS dense than...
solids of the same material (water is an exception)
what is volume?
the amount of space an object takes up.
how do you find the volume of an irregular object?
water displacement