Density

Question 1

what is density

Answer 1

the measure of the compactness of a substance

Question 2

what does density relate to

Answer 2

the mass of the substance and how much space it takes up

Question 3

what is the formula for density

Answer 3

• density = mass / volume

- p = m /v

Question 4

what are the two possible unit of density

Answer 4

g/cm^3 or kg/cm^3

Question 5

what is density not affected by

Answer 5

the size or shape of the object

Question 6

what does the average density of an object determine

Answer 6

• whether it floats or sinks

- a solid will float on the fluid if it has a lower average density than the fluid

Question 7

how do you find the density of a substance

Answer 7

measure its mass and volume and use the density formula

Question 8

what is the easiest way to measure the density of a liquid

Answer 8

by using a measuring cylinder

Question 9

how do you find the density of a liquid

Answer 9

• use a mass balance to measure the mass of the empty cylinder
• pour the liquid and record the increase in mass (total recording - mass of cylinder)
• volume of the water is shown on the measuring cylinder (1ml = 1cm^3)
• use the density equation (mass / volume)

Question 10

what would be the thinking process behind measuring the volume of an object with an irregular shape

Answer 10

by using the fact that an object submerged in water will displace a volume of water equal to its own volume

Question 11

what is the process of measuring the density of an object with an irregular shape

Answer 11

• measure the mass (m1) of the object using a mass balance
• fill the bottle with a liquid of a known density
• place the stopper in the bottle and dry the outside
• measure the mass of the bottle (m2)
• empty the bottle and place the object into the density bottle
• repeat the filling and placing steps
• measure the mass of the bottle (m3) and calculate the volume of displaced water

Question 12

how would you calculate the mass and volume of the displaced water in the experiment to find the density of an irregularly shaped object

Answer 12

• the mass of the displaced water = m2 - (m3 - m1)
• you know the density of water, so you can use volume = density / mass to find the volume displaced
• this equals the volume of the object

Question 13

how do you calculate the density of the irregularly shaped object in the experiment

Answer 13

by calculating the density of the object using p = m / v with the mass measured in step 1 and the volume calculated in the final steps