Neco Model Questions Vol1 2018 Chemistry Question 2

Practice practical question 2 from the 2018 Neco Model Questions Vol1 Chemistry examination. This question covers Periodic Table, Stoichiometry, Determination of atomic weight .

Neco Model Questions Vol1 2018 Chemistry Practical

Topics: Periodic Table Stoichiometry Determination of atomic weight

Question 2 NECO_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • practical

A student determines the atomic weight of magnesium by oxidising a known mass of magnesium ribbon in a crucible. The masses recorded are: Empty crucible: 15.000 g Crucible + Mg ribbon (before heating): 15.500 g Crucible + MgO (after heating to constant mass): 15.830 g

Question Parts

( a )

Calculate the mass of magnesium, the mass of oxygen that combined with it, and the atomic weight of magnesium (assume Mg forms MgO with valency 2).

( b )

State two possible sources of error that could affect the result obtained in part (a).

( c )

Suggest one precaution that can be taken to minimise the error mentioned in part (b).

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About This Question

This is Neco Model Questions Vol1 2018 Chemistry Question 2. It is one of the practical questions from the 2018 Neco Model Questions Vol1 Chemistry examination.

The question covers Periodic Table, Stoichiometry, Determination of atomic weight .

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