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Centrale Mentoring | Serangoon Tuition Center

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Author: Joey Chue

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 3,041 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 2,717 Comments Read more

Test For Carbon Dioxide

State the chemical reagent you would use to test for the presence of Carbon Dioxide in the laboratory and give its chemical formulae

Joey Chue January 28, 2015 O Level Chemistry 1,311 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 6,156 Comments Read more

Acidic Gas

Why is Sulfur Dioxide described as an acidic gas?

Joey Chue January 27, 2015 O Level Chemistry 417 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 200 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 531 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 3,311 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 133 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 7,002 Comments Read more
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