Density and cinverting units

Question 1

Converting units of measurement: Km to m

Answer 1

1 Km = 1000 m

Example: 3.9 Km = 3900 m

Question 2

Converting units of measurement: m to mm

Answer 2

1 m = 1000 mm

Question 3

Converting units of measurement: m to cm

Answer 3

1 m = 100 cm

Question 4

Density calculation

Answer 4

Density (D) = Mass (m) / Volume (V)

Given: V=15.759 cm³, m=15.75 g
Required: D=?
Analysis: D= 1.05 g/cm³

Question 5

Clues of a chemical change:

Answer 5

1. Produces bubbles of a new gas
   2.New solid is produced when two liquids are mixed (precipitate)
   3.New colour produced
   4.Temperatyre change /energy is released
   5.Produces light
   6.New odour or smell produced
   *7. Irreversible with very few exceptions

Question 6

Classify the four areas of matter

Answer 6

Soloution: One phase, looks like only one type of matter is making it up
Mechanical mixture: Two or more visible components, easily distinguished and seperated
Element: found on the periodic table and cannot be broken down into simpler substances
Compound: contains two or more elements

Question 7

Chemical properties are

Answer 7

Combustibility
Reaction with acid
Reaction with water
Oxidation/Rusting