Properties and Uses of Materials

Question 1

List metal properties

Answer 1

• Tend to lose electrons
• Generally good conductors of heat and electricity
• Malleable
• Ductile
• Lustrous
• Higher boiling and melting point

Question 2

List non-metal properties

Answer 2

• Tend to gain electrons
• Poor conductors of heat and electricity
• Brittle
• Lower boiling and melting point
• Not lustrous

Question 3

Examples of pro high boiling/ melting points

Answer 3

Heat/ boiling/ melting point:
- Aluminum pans for cooking
- Ceramic bowls to hold hot food
- Stainless steel drink bottles to hold hot water

Electrical:
- Copper used for wires

Question 4

Examples of pro low boiling/ melting points

Answer 4

Heat/ boiling/ melting point:
- thermoplastics used for commercial packaging
- sugar for cooking
- fragrances and perfume

Question 5

Physical change/ characteristics definition

Answer 5

Describes characteristics that do not change the chemical identity of a substance

Question 6

Chemical change/ characteristics definition

Answer 6

Describes characteristics that will change the chemical identity of a substance

Question 7

List of physical change

Answer 7

• shape change
• state change
• appearance (not colour if produced)

Question 8

List of chemical change

Answer 8

• a new chemical bond formed e.g. O2 –> CO2
• colour change
• effervescence
• new products
• light produced
• energy change (exothermic and endothermic)
• change in pH
• Oxidation/ Corrosion