Combined Science: Chemistry IGCSE Practice Exam Answered Correctly.
5 views 0 purchase
Course
Combined Science
Institution
Combined Science
What is the effect of adding NaOH to iron (III) (Fe³⁺)? Then adding ammonia solution? - Answer Adding NaOH: red/brown precipitate. Insoluble in excess.
Adding ammonia solution: same as before.
What is the effect of adding NaOH to zinc (Zn)? Then adding ammonia solution? - Answer Addin...
Combined Science: Chemistry IGCSE
Practice Exam Answered Correctly.
What is the effect of adding NaOH to iron (III) (Fe³⁺)? Then adding ammonia solution? - Answer Adding
NaOH: red/brown precipitate. Insoluble in excess.
Adding ammonia solution: same as before.
What is the effect of adding NaOH to zinc (Zn)? Then adding ammonia solution? - Answer Adding
NaOH: white precipitate forms. Dissolves in excess to form colourless solution.
Adding ammonia solution: same as before.
State the colours for lithium (Li⁺), sodium (Na⁺), potassium (K⁺), and copper (Cu²⁺) - Answer In order:
red, yellow, lilac, blue/green
How can you identify carbonates (CO₃²⁻)? - Answer Test: add dilute acid and test the gas released.
Result: gas produced is CO₂, turns limewater milky.
How can you identify chlorides (Cl⁻)? - Answer Test: acidify with dilute nitric acid and add aqueous
silver nitrate
Result: white precipitate is formed.
How can you identify nitrates (NO₃²⁻)? - Answer Test: add aqueous NaOH and aluminium fil, warm
gently and test the gas released.
Result: ammonia gas is given off. Has a pungent smell and turns litmus blue.
How can you identify sulfates (SO₄²⁻)? - Answer Test: acidify with dilute nitric acid and add aqueous.
barium nitrate.
Result: white precipitate is formed.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller TestSolver9. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.49. You're not tied to anything after your purchase.
