D. Awesome Acids Flashcards
What is the number range of the pH scale?
0-14
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.
False
Name 3 indicators used in the lab
pH paper universal indicator red cabbage indicator
What is the pH value for neutral solutions?
7
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?
Rust
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?
- 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?
Lower
Do strong alkalis have a higher or lower pH than weak alkalis?
Higher
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
