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Chemistry
GCSE

An atom of iron is represented as 26Fe 56 Give the number of protons, neutrons and electrons in this atom of iron.

26 protons, 30 neutrons and 26 electrons.

Answered by Sebastian M. Chemistry tutor
12006 Views

What mass of sodium hydroxide would need to be dissolved to make 100 cm^3 of a 0.5 mol dm^-3 solution? (3 marks)

Number of moles = (0.5 x 100)/1000 = 0.05 moles (1 mark)Molar mass, M, of NaOH = 23 + 16 + 1 = 40 (1 mark)Mass of NaOH needed = moles x M = 0.05 x 40 = 2g (1 mark)correct answer alone scores 3 markscorrec...

Answered by Aarif A. Chemistry tutor
7281 Views

Why is chlorine more reactive than iodine?

Chlorine has fewer shells than iodine - chlorine has 2 and iodine has 4. We know this by referring to the periodic table. This means its outer electrons are closer to the nucleus.Because ...

Answered by Antonia S. Chemistry tutor
9450 Views

Explain the type of bonding in sodium chloride.

The type of bonding in sodium chloride is ionic. This sodium atom loses its outer most electron to complete its outer most shell to form a sodium ion (positive) and donates it to the chlorine atom which a...

Answered by Ankit R. Chemistry tutor
3711 Views

How do you calculate the relative atomic mass of an element

The relative atomic mass (Ar ) is calculated from 2 things : mass numbers of its isotopes and abundance of these isotopes.Let's use Chlorine as an example. Chlorine naturally exists as two isot...

Answered by Priyancaa J. Chemistry tutor
28171 Views

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