Question

If the density of wood is 0.5g cm-3, what is the mass of a piece of wood of volume (a) 1 cm 3 ?

Answer 1

-

5 (blue book) density

1(a) If the density of wood is 0.5g/cm

3

, what is the mass of

(6)

(i)

1 cm

3

(ii) 2 cm

3

(iii) 10cm

3

M= ? g M= ? g M

= ? g

D= 0.5g/cm

3

D= 0.5g/

cm

3

D=0.5g/cm

3

V= 1cm

3

V=2cm

3

V= 10cm

3

D= M/V D= M/V

D= M/V

M= D X V M= D X V

M= D X V

M = 0.5g/cm

3

X 1cm

3

M= 0.5 g/cm

3

X 2cm

3

M = 0.5g/cm

3

X 10cm

3

M= 0.5 g M= 1.0 g M

= 5g

1(b) What is the

density of a substance of:

(4)

(i)

mass

100g and volume 10cm

3

(ii) volume 3 m

3

and mass

9kg

D=? D=?

M= 100g

M= 9kg

V = 10cm

3

V = 3m

3

D=M/V

D=M/V

D= 100g/ 10cm

3

D= 9kg/3m

3

D= 10g/cm

3

D = 3kg/m

3

1(c) The density of gold is 19g/cm

3

. Find the volume of

(4)

(i)

38g of gold (ii) 95g of gold

D= 19g/cm

3

D= 19g/cm

3

M= 38g M = 95 g

D=M/V

D=M/V

V=M/D V=M/D

V= 38g

/

19g/cm

3

V=

95g / 19g/cm

3

V= 2 cm

3

V=5 cm

3

Pick out

info

Write

info

along with

units

Write base equation

and rearrange if

necessary

Substitute values

along with the

units

.

Work out

units of the answer

Calculate, write answer