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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 markscorrect f...
AA
Answered by Aarif A. • Chemistry tutor
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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 they are closer - o...
AS
Answered by Antonia S. • Chemistry tutor
14970 Views

How do I explain that the breakdown of an ester is a hydrolysis reaction?

The breakdown of any product using water is called a hydrolysis reaction. Ester + Water ---> Alcohol + Carboxylic acid An ester splits into alcohol and carboxylic acid during its reaction with water, maki...
MU
Answered by Mamie U. • Chemistry tutor
1780 Views

Order the following in terms of boiling point and explain your reasoning: Ethanol, Ethane, Propane

All three molecules have induced dipole-dipole interactions. Propane has a higher boiling point than ethane as propane has a higher molecular mass. This means there are more electrons present and the induced...
LC
Answered by Lucy C. • Chemistry tutor
14575 Views

Explain why: a) Fluorine is more electronegative than chlorine b)∆H hydration fluoride is more negative than ∆H hydration chloride

a) The fluorine atom is smaller than the chlorine atom, and there is less shielding from other shells of electrons. Thus the bonding pair of electrons are more attracted to the positive nucleus. b) The fluor...
OS
Answered by Osama S. • Chemistry tutor
22511 Views