When preparing a soluble salt, why is the base added in excess?

To make sure all the acid reacts and none is left

Why is aluminium extracted by electrolysis rather than with carbon?

Aluminium is more reactive than carbon, so carbon cannot displace it

By reduction with carbon in a blast furnace

So the ions are free to move and carry charge

Gives out energy and warms them

Lower in energy than the reactants

The minimum energy needed for particles to react

14questions. Pick an answer and you'll see why right away.

What is the pH of a neutral solution?
Which ion do acids release in water?
What are the products of acid + metal?
What extra product forms when an acid reacts with a carbonate (compared with a base)?
When preparing a soluble salt, why is the base added in excess?
Which metal will displace copper from copper sulfate solution?
Why is aluminium extracted by electrolysis rather than with carbon?
How is iron usually extracted from its ore?
Why must an ionic compound be molten or dissolved for electrolysis?
During electrolysis, where do positive metal ions go?
An exothermic reaction does what to the surroundings?
On a reaction profile for an exothermic reaction, where are the products?
What is the activation energy?
A reaction's temperature drops when it happens. What type of reaction is it?