Density

Question 1

what is the equation for density?

Answer 1

density (g/cm³ or kg/m³) = mass (g or kg) ÷ volume (cm³ or m³)

desnity = mass ÷ volume

Question 2

what is the traingle for density?

Answer 2

Question 3

what is the density of water?

Answer 3

1 g/cm³—> 1000kg/m³

Question 4

what does density depend on

Answer 4

the temprature of the substance

Question 5

for an object to float what must it be

Answer 5

less dense than the fluid in which it is placed

Question 6

how do you find the density in a regular solid

Answer 6

find the mass on a balance

measure the three sides; multiply them together to find the volume

density = m ÷ v

Question 7

how do you find the density of an irregular solid?

Answer 7

find the mass on a balance

find the volume by meauring the displacement of water in a cylider

density = m ÷ v

Question 8

how do you find the desnity of liquids?

Answer 8

find the mass of an empty measuring cylinder

put in the liquid

measure the volume

find the mass of the cylinder and the liquid

subtract the mass of the cylinder

density = m ÷ v

Question 9

how do you find the density of gases?

Answer 9

fill a round bottomed flask with the gas

stopper the flask with a bung which has glass and rubber tuning and clip attached

using a top pan balace find the mass of the flask, stopper and gas

attach the flask to a vaccum pump

switch off the pump to remove the flask from the pump

using a top pan balance find the mass of the flask, stopper, and any remaining gas in the flask

the mass of the removed gas is the differnence between the two mass readings

fill a trough full of water

holding the flask upside down, place the tube from the bung in the water and unclip the tube

water will rush into the tube to take the place of the removed gas

once no more water is entering the flask, turn it the right way up again and carefully pour the water into a measuring cylinder

the volume of the water is the volume of the gas removed from the flask

Question 10

am object has the mass of 100g and the volume of 20 cm³

what is its density?

Answer 10

d = m ÷ v

100 ÷ 20

5 g/cm³

Question 11

an object has the density of 6000 g/cm³ and a volume of 3cm³

what is its mass?

Answer 11

m = d x v

6000 x 3

= 18000g

Question 12

an object has the density of 500 g/cm³ and the mass of 2000g

what is its volume?

Answer 12

v = m ÷ d

2000 ÷ 500

= 4cm³

Question 13

here are the densities of several objects

A = 2000 kg/m³

B = 8000 kg/m³

C = 2000 kg/m³

D = 500 kg/m³

which objects are made of the same substance?

Answer 13

A and C

they have the same densities

Question 14

here are the densities of several objects

A = 2000 kg/m3

B = 8000 kg/m3

C = 2000 kg/m3

D = 500 kg/m3

which object would float on water?

Answer 14

D

it has a density of less than 1000kg/m³ (the density of water)