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Chemistry
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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 markscorrec...

AA
Answered by Aarif A. Chemistry tutor
8585 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 ...

AS
Answered by Antonia S. Chemistry tutor
12380 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 wi...

MU
Answered by Mamie U. Chemistry tutor
1589 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 indu...

LC
Answered by Lucy C. Chemistry tutor
13500 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)...

OS
Answered by Osama S. Chemistry tutor
21113 Views

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