Flashcards in C5 Chemical Changes Deck (20):
What are ores?
Metals in their raw materials.
What is the order of the reactivity series?
What is a displacement reaction?
When a more reactive substance displaces a less reactive metal from an aqueous solution of its salts.
What is reduction and oxidation?
Oxidation=loss of electrons.
Reduction=gain of electrons.
How do you know whether it is worth extracting a particular metal depend on?
Ease of extraction from its ore.
Quantity of metal ore contains.
Changing demands for particular metal.
What is the order of the reactivity series with Carbon and Hydrogen?
What is the equation for a metal that is > reactive than hydrogen reacting with an acid?
Metal + acid = Salt + Hydrogen.
What does the salt produced depend on?
The metal used as well as acid used.
What do you get when you react an acid with a base?
A salt + water.
What is an alkali?
An alkali is a base that dissolves in water.
How do you collect a pure dry sample of crystals of the salt?
Carry out titration with indicator added to see how much acid reacts completely with alkali.
Run volume of acid into solution of alkali again, but without indicator.
Crystallise + dry crystals of salt from reaction mixture.
What colour are acids and alkalis on the Ph scale?
What do all alkalis form?
Aqueous hydroxide ions.
What is the difference between acids that are dilute solutions and concentrated solution ones?
6.0mol/dm3 of hydrochloric acid, relatively concentrated + labelled as corrosive. Whereas acidic solution diluted by adding water; gives solution of 0.10mol/dm3 of hydrochloric acid + labelled as irritant.
What is the difference between a carboxylic (ethanoic) acid and hydrochloric acid of same concentration?
Carboxylic acids called weak acids, Hydrochloric acid called a strong acid. Weak acids not harmful when dilute nor harmful when concentrated.
What happens if potassium is reacted with dilute acid?
It would explode.
What happens if you react sodium or lithium with dilute acid?
They would explode.
What would happen if you react calcium, magnesium, aluminium, zinc or iron with dilute acid?
Fizz, giving off hydrogen gas, and form a salt.
What would happen if you react tin or lead with dilute acid?
It would react slowly with warm acid.