Turn on thread page Beta
    • Thread Starter
    Offline

    3
    ReputationRep:
    Magnesium produces a 2+ ion and oxygen produces a 2- ion. Explain how you would calculate the formula for the compound magnesium oxide using this information.
    Offline

    8
    ReputationRep:
    Essencially because magnesium is a 2+ ion and oxygen is a 2-. The common denominator of this is 2. What do you multiply by 2 to get 2? 1 so it is a 1:1 ratio and would be MgO.


    For something harder such as iron (III) and oxygen to make iron oxide,
    Iron has. 3+ charge and oxygen has a 2- charge. The common denominator of these numbers is 6.
    For iron, what do you multiply 3 by to get 6? = 2. So it would be Fe(subscript 2)
    For oxygen, what do you multiply 2 by to get 6? = 3. So it would be O(subscript 3)
    So overall it would be Fe2O3.
    It’s all about balancing the charges
    Posted on the TSR App. Download from Apple or Google Play
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by 12doeb)
    Essencially because magnesium is a 2+ ion and oxygen is a 2-. The common denominator of this is 2. What do you multiply by 2 to get 2? 1 so it is a 1:1 ratio and would be MgO.


    For something harder such as iron (III) and oxygen to make iron oxide,
    Iron has. 3+ charge and oxygen has a 2- charge. The common denominator of these numbers is 6.
    For iron, what do you multiply 3 by to get 6? = 2. So it would be Fe(subscript 2)
    For oxygen, what do you multiply 2 by to get 6? = 3. So it would be O(subscript 3)
    So overall it would be Fe2O3.
    It’s all about balancing the charges
    Oh I get it now thank you very much.
 
 
 
Poll
Is the Big Bang theory correct?
Useful resources

Study tools

Rosette

Essay expert

Learn to write like a pro with our ultimate essay guide.

Thinking about uni already?

Thinking about uni already?

See where you can apply with our uni match tool

Student chat

Ask a question

Chat to other GCSE students and get your study questions answered.

Creating

Make study resources

Create all the resources you need to get the grades.

Planner

Create your own Study Plan

Organise all your homework and exams so you never miss another deadline.

Resources by subject

From flashcards to mind maps; there's everything you need for all of your GCSE subjects.

Papers

Find past papers

100s of GCSE past papers for all your subjects at your fingertips.

Help out other students

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.