C5 Flashcards
How can metals be placed in order of reactivity?
By their reaction with water and dilute acid
When is hydrogen gas given off
When metals react with water or dilute acid. The gas ‘pops’
What will displace a less reactive metal
A more reactive metal
Wher are ores found and taken from
Mined from the ground and might need to be concentrated before the metal is reacted
Wher can gold and other unreactive metals be foudn
In their native state
How can metals be extracted from compounds
By displacment using a more reactive element
What is a salt
A compounds formed when the hydrogen in an acid is wholly or partically replaced by metal
How can salts be made
By reacting a suitable metal with an acid
What does the reaction between a metal and an acid produce
Hydrogen gas as well as salt
How can a sample of salt be crystalised
Evaporating off the water
What occurs when an acid reacts with a base
A neutralisation reaction occurs
What does a reaction between acid and a base produce?
Salt and water
What doe the sum of the charges on the ions in a alt add up to
Zero
When is an indicator needed with salt
When a soluble salt is prepared by reacting an alkali wiith an acid
Acids are subastances that
Prodcues h+ ions when you add them to water
