Required practical 5 density

Question 1

Outline the basic steps of calculating the density of a regular shaped object ?

Answer 1

> measure the dimensions of the regular shape and calculate the volume
measure the mass of the shape using a calibrated spring balance
calculate density from the mass and volume

Question 2

Give the formula for volume of a prism

Answer 2

Volume = area of face x height

Question 3

What equation is used to calculate volume of a rectangular prism

Answer 3

Volume = length x width x height ( this also applies to cubes )

Question 4

Give the formula for volume of a sphere

Answer 4

Volume = 4/3 x pie x radius cubed

Question 5

What equation is used to calculate density

Answer 5

Density =mass/volume

Question 6

What unit is used for density

Answer 6

Kg /m cubed

Question 7

What piece of equipment is used to measure the objects mass what must you do before using it ?

Answer 7

A digital balance , which should be zeroed before placing the object onto it to avoid error

Question 8

How do you convert from g/cm cubed to kg/m cubed

Answer 8

Divide the value by 1000

Question 9

Outline the basic steps of calculating the density of an irregular shaped object

Answer 9

> measure the mass of the irregular shape
fill a displacement can with water and submerge the object
record the volume of water that has been displaced
calculate the density from the mass and volume

Question 10

What should you place under the can spout to collect the water

Answer 10

A measuring beacker

Question 11

Explain how you should fill the displacement can to get the most accurate results ?

Answer 11

Fill the can until water starts to drip out of the spout and into the beacker , wait until the dripping just stops before submerging the object

Question 12

Outline the basic steps of calculating the density of a liquid

Answer 12

Measure the mass of the empty measuring cylinder
Pour around 100cm cubed of liquid into the cylinder and record the volume
Measure the mass of the cylinder with the liquid in and subtract the cylinders mass to calculate the mass of liquid
Calculate the density from the mass and volume

Question 13

How does the density of solids and liquids compare ?

Answer 13

In general solids are much more dense than liquids since their particles are more tightly packed together meaning there is more mass per unit volume