FB 5 is a compound containing one cation and one anion, both of which are listed in the Qualitative analysis notes. (i) Heat a small spatula measure of FB 5 in a hard-glass test-tube until no further change occurs. Record your observations. ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ................................................................................................................................. (ii) Describe another test to positively identify the cation in FB 5. Carry out your test and record your observations. test ................................................................................................................................ observations .................................................................................................................. (iii) Put a 1 cm depth of dilute hydrochloric acid in a test-tube. Add a small spatula measure of FB 5. Record your observations. ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ................................................................................................................................. (iv) Deduce the formula of FB 5 . FB 5 is .......................... .

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s24_qp_34 Year：2024 Question No：(a)

Answer:

6.1.1 calculate oxidation numbers of elements in compounds and ions

6.1.2 use changes in oxidation numbers to help balance chemical equations

6.1.3 explain and use the terms redox, oxidation, reduction and disproportionation in terms of electron transfer and changes in oxidation number

6.1.4 explain and use the terms oxidising agent and reducing agent

6.1.5 use a Roman numeral to indicate the magnitude of the oxidation number of an element