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Centrale Mentoring | Serangoon Tuition Center

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A Level Chemistry

Covalent Bonding

Explain why compounds formed from non-metals normally do not conduct electricity and have a relatively low boiling point?

Joey Chue January 30, 2015 A Level Chemistry, O Level Chemistry 4,511 Comments Read more

Ideal Gas Conditions

Under what conditions of temperature and pressure is the behavior of a real gas most like that of an ideal gas? Explain your answer.

Joey Chue January 30, 2015 A Level Chemistry 3,568 Comments Read more

Speed Of Reaction (Concentration)

Explain in molecular terms how the rate of reaction is affected by changing the concentrations of reactants

Joey Chue January 28, 2015 A Level Chemistry, O Level Chemistry 7,213 Comments Read more

Buffer

What is the pH of a solution containing 0.10 mol/dm3 Citric Acid and 0.30 mol/dm3 Sodium Citrate? Citric Acid: Ka = 7.4 x 10^-4 mol/dm3

Joey Chue January 27, 2015 A Level Chemistry 538 Comments Read more

Isotopes

In a sample of 100 atoms of Boron, there are 20 atoms of Boron – 10 and 80 atoms of Boron – 11. (i) Explain why these two forms of Boron are isotopes? (ii) Calculate the relative atomic mass of

Joey Chue January 26, 2015 A Level Chemistry, O Level Chemistry 1,538 Comments Read more

Strong Or Weak Acid?

A 0.010 mol/dm3 aqueous solution of an acid HA has a pH of 2.0. Is HA a strong or a weak acid? Explain your answer.

Joey Chue January 26, 2015 A Level Chemistry 4,399 Comments Read more

Enthaply Change

Calculate the ∆Hsolution, ∆Ssolution and ∆Gsolution for the following equilibrium at 298K. AgCl (s) <-> Ag+ (aq) + Cl- (aq) AgCl (s): ∆Hf = -127.0 kJ/mol, ∆Sf = +96.1 J/mol Ag+ (aq): ∆Hf = +105.9 kJ/mol, ∆Sf = +73.9 J/mol

Joey Chue January 26, 2015 A Level Chemistry 418 Comments Read more

Melting Points

Explain, in terms of their structure and bonding, why the melting points of Calcium Fluoride (CaF2 1418°C) and Phosphorus Trifluoride (PF3 -151°C) are so different?

Joey Chue January 26, 2015 A Level Chemistry, O Level Chemistry 8,203 Comments Read more

Geometrical Isomerism

How many geometrical isomers are there of hex-2,4-diene, CH3CH=CHCH=CHCH3?

Joey Chue January 26, 2015 A Level Chemistry 5,261 Comments Read more

Hydrolysis of Halogenoalkanes

The hydrolysis of 1-chloropropane to produce propan-1-ol is much slower corresponding to hydrolysis of 1-iodopropane. Explain this observation.

Joey Chue January 26, 2015 A Level Chemistry 59 Comments Read more
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  • Covalent Bonding
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