What is the number range of the pH scale?
What does the pH scale measure?
The acidity or alkalinity of a substance
What is the pH range for acids?
Less than 7
What is the pH range for alkalis?
Greater than 7
True or false? The pH scale can only measure in whole numbers.
Name 3 indicators used in the lab
pH paper universal indicator red cabbage indicator
What is the pH value for neutral solutions?
Name 2 ways of neutralising an acid
Dilution with water Reacting with an alkali
What are the 3 ways of extracting metals
Heating Heating with carbon Electrolysis
What do we call the substance formed when iron reacts with oxygen and water?
What are produced when a metal reacts with water?
An alkali and hydrogen
What are produced when a metal reacts with an acid?
A salt and hydrogen
What is the test for oxygen?
It relights a glowing splint
What is the test for hydrogen?
It burns with a pop
What are the products of neutralisation?
A salt plus water
What type of substance would you take if you had acid indigestion?
A substance with a pH above 7
Name 2 metals that do not react with oxygen
Gold Silver Platinum
name 4 metals that react with water
Potassium Sodium Lithium Calcium
what is produced when metals react with oxygen?
A metal oxide
What is an ore?
A naturally occuring metal compound
What is displacement?
When a metal replaces another less reactive metal in a compound
What is the reactivity series?
A table of metals with most reactive at top and least reactive at bottom
Name 2 metals that do not react with acids
Copper Silver Gold Mercury Platinum
What is meant by neutralisation?
The pH value moves towards and reaches 7
How do you test for pH value?
1. Add some suitable indicator to substance 2. Match colour to appropriate colour chart 3. Read off pH value matching that colour
Do strong acids have a higher or lower pH than weak acids?
Do strong alkalis have a higher or lower pH than weak alkalis?
What type of substance would be used to treat an alkaline wasp sting?
A substance with a pH below 7
What are produced in a neutralisation reaction?
A salt plus water