Chapter 19 - Density and Pressure

Question 1

How should a student use a measuring cylinder to make her measurements as accurate as possible (2)

Answer 1

• eyes to water level - cylinder on a flat surface

Question 2

How should a student use an electronic balance to make her measurements as accurate as possible (2)

Answer 2

• place on stable surface - Set to zero

Question 3

A correct unit for density is (1) a) g/cm b) kg/cm c) g/cm² d) g/cm³

Answer 3

d) g/cm³

Question 4

What is the instrument used to measure mass (1)

Answer 4

electronic balance

Question 5

A student is measuring density using mass and volume. State one factor she should keep the same (1)

Answer 5

Temperature

Question 6

Why is it important to keep temperature the same in a density = mass/volume experiment (1)

Answer 6

can affect the density/volume

Question 7

Who is correct - Kalpana or Chrisitine? [2 marks]

Explain your answer.

Answer 7

• Kalpana
• Density compares masses to volume, as mass increases, volume increases; In proportion;

Question 8

Which measuring cyclinder would give the most precise measurement? Explain your answer.

Answer 8

• A
• Measures to the smallest scale divisions

Question 9

The most precise measuring cyclinder may not give an accurate reading.

Suggest why [1 mark]

Answer 9

• might not be level/flat

Question 10

State the equation linking density, mass and volume [1 mark]

Answer 10

density = mass x volume

Question 11

Calculate the density of this stone.

Mass = 54 g

Volume = 23 cm³

Answer 11

Density = mass/volume

54/23

= 2.3 g/cm³

Question 12

How can Kalpana use a value of density to identify a type of stone? [2 marks]

Answer 12

look it up in a book / internet;