Date: Section Name MAKING PHYSICAL & CHEMICAL OBSERVATIONS PART A: OBSERVATIONS

Question

Date: Section Name MAKING PHYSICAL & CHEMICAL OBSERVATIONS PART A: OBSERVATIONS vs. CONCLUSIONS Laboratory Report Observations and Data (1 mark) Part 1 - Observing some reactions of Cu Observations Description of procedural step pennies before acid treatment penny after dipping e-way in acid pennies after soaking - immediately penaics itt ren color stored the se pennies after soaking -after 5 min most of the pennies became cleu nunelshs T us unrinsed pennies - after 1 h in air not ckon as fie sel gemmics nail/screw in acid - immediately chonye d coler Prom Siher he potelly nail/screw in acid - after min and Hae (2 marks) Part 2 - Comparing the reactivity of some metals with acids Metal ...with water ...acetic acid ...hydrochloric acid steel wool nohing Mg ribbonos Al sheet oartral Sn powder nottn notkla abseyn and haet mahon nothing ob sevure au Zn powder nothing ob serue

Explanation / Answer

(i) Nature of acid used =

Al and Mg react better than the others with HCl and Acetic acid. Thus they could be in the more reactive/active metal zone in the periodic table. Sn and Zn are lesser reactive than Mg and Al

So, the order of reactivity can be Mg>Al>Zn>=Sn

Yes, these trends are consistent with the properties learnt in class.

(ii) Periodic table -

Reactivity of metals goes lesser as we move down the group. Also, metallic properties go lesser if we move from left to right. As Mg comes before Al, it should be more reactive than Al and it is clear from our experiment

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