Chapter 5: Properties of materials Flashcards
Metals and non-metals. Comparing metals and non-metals. Metal mixtures. Using the properties of materials to separate mixtures. Acids and alkalis. Indicators and the pH scale.
List 5 properties of metals
Malleable, shiny, ductile, good conductor of heat and electricity, sonorous
List 5 properties of non-metals
Non-malleable, not sonorous, dull, insulators, brittle
What is an alloy?
An alloy is a mixture of metals
How are alloys made?
By mixing different metals together
Name 3 examples of alloys
Steel, bronze, brass
What is brass a mixture of?
Zinc + copper
What does alloy does copper and tin make
Bronze
What are alloys usually used for?
Jewellery, coins, and airplanes
Name 3 examples of acids
hydrochloric acid, sulfuric acid, nitric acid
Name 3 examples of alkaline substances
Soap, toothpaste, bleach
What are characteristics of acids?
- sour
- corrosive
- harmful
What are the characteristics of alkalis?
- bitter
What is a universal indicator?
A substance which shows how acidic or alkaline a substance is.
What colour does the litmus paper turn if the substance is an acid
red
What colour does the litmus paper turn if the substance is neutral
purple
What colour does the litmus paper turn if the substance is an alkali
blue
Label the colours according to the PH scale
0-2 :
3-4 :
5-6 :
7 :
8-9 :
10-11 :
12-14 :
0-2 : Red
3-4 : Orange
5-6 : Yellow
7 : Green
8-9 : Light Blue
10-11 : Dark Blue
12-14 : Purple
Which property of metals is most useful when:
Copper is used for electrical wiring
Good conductor of electricity
Which property of metals is most useful when:
Gold is used for jewelry
Shiny
Which property of metals is most useful when:
Iron is used to build bridges
Strong
Which property of metals is most useful when:
Stainless steel is used for cooking pans
Good conductor of heat
