Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta

Chemistry AS Help Needed !! watch

Announcements
    • Thread Starter
    Offline

    14
    ReputationRep:
    Help !!!!!!!!!! Help !!!!!!!!!!!
    Which of the following contains one mole of neutrons?
    A) 1 g of 1 1 H
    B) 1 g of 12 6 C
    C) 2 g of 24 12 Mg
    D) 2 g of 22 10 Ne

    Bold letters mean Relative Mass
    Underline mean Atomic number
    Offline

    7
    ReputationRep:
    A
    Edit: sorry no it's not!
    Posted from TSR Mobile
    Offline

    7
    ReputationRep:
    C

    Moles of Mg = 2/24 =1/12

    12 neutrons in each Mg atom

    Therefore there are 12 x 1/12 moles of neutrons = 1 mole of neutrons


    Posted from TSR Mobile
    • Thread Starter
    Offline

    14
    ReputationRep:
    (Original post by 1lilypad1)
    C

    Moles of Mg = 2/24 =1/12

    12 neutrons in each Mg atom

    Therefore there are 12 x 1/12 moles of neutrons = 1 mole of neutrons


    Posted from TSR Mobile
    You are correct and the REAL ANSWER IN MARK SCHEME IS C
    • Thread Starter
    Offline

    14
    ReputationRep:
    (Original post by 1lilypad1)
    C

    Moles of Mg = 2/24 =1/12

    12 neutrons in each Mg atom

    Therefore there are 12 x 1/12 moles of neutrons = 1 mole of neutrons


    Posted from TSR Mobile
    so...
    D is also closer to 1 right?
    It is 1.09090909
    Say ??
    Offline

    7
    ReputationRep:
    (Original post by NNB_Herath)
    so...
    D is also closer to 1 right?
    It is 1.09090909
    Say ??
    D is close to 1 I suppose but it isn't actually 1. But C is correct no?


    Posted from TSR Mobile
    • Thread Starter
    Offline

    14
    ReputationRep:
    (Original post by 1lilypad1)
    D is close to 1 I suppose but it isn't actually 1. But C is correct no?


    Posted from TSR Mobile
    Yes C is correct ..
    Thanks bro....

    One more question

    Which of the following compounds has the greatest ionic character?
    A) Caesium fluoride
    B) Caesium iodide
    C) Potassium fluoride
    D) Potassium iodide
    Offline

    7
    ReputationRep:
    (Original post by NNB_Herath)
    Yes C is correct ..
    Thanks bro....

    One more question

    Which of the following compounds has the greatest ionic character?
    A) Caesium fluoride
    B) Caesium iodide
    C) Potassium fluoride
    D) Potassium iodide
    It will be the one where the two ions have the greatest difference in electronegativity. Fluorine is the most electronegative element so it will be A or C, but I'm not sure which of Cs or K is less electronegative.
    • Thread Starter
    Offline

    14
    ReputationRep:
    (Original post by 1lilypad1)
    It will be the one where the two ions have the greatest difference in electronegativity. Fluorine is the most electronegative element so it will be A or C, but I'm not sure which of Cs or K is less electronegative.
    but Fluorine is more electronegative than Iodine right?

    Edit : OK OK ...i understood...

    The actual answer is A
 
 
 
Poll
Do I go to The Streets tomorrow night?
Help with your A-levels

All the essentials

The adventure begins mug

Student life: what to expect

What it's really like going to uni

Rosette

Essay expert

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

Uni match

Uni match

Our tool will help you find the perfect course for you

Study planner

Create a study plan

Get your head around what you need to do and when with the study planner tool.

Study planner

Resources by subject

Everything from mind maps to class notes.

Hands typing

Degrees without fees

Discover more about degree-level apprenticeships.

A student doing homework

Study tips from A* students

Students who got top grades in their A-levels share their secrets

Study help links and info

Can you help? Study help unanswered threadsRules and posting guidelines

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.