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Q1. What is valency of an element?
Q2. What is the valency of Cl in HCl?
Q3. What is the valency of nitrate radical in Nitric acid and sulphate radical ion in sulphuric acid?
Q4. What is the valency of elements which do not combine with hydrogen?
Q5. Explain the valency of an element in electronic state.
Q6. What are univalent or monovalent ions?
Q7. What are cations?
Q8. Give examples of univalent,divalent and polyvalent cation
Q9. Explain the law of constant composition
Q10. What is the law of conservation of mass?
question the reaction a 2b products was found to have the rate law rate kab2. predict by what factor the rate of
An acid with a Ka of 1 x 10-8 is titrated with NaOH, both solutions being 0.020 M. What should the Ka of the indicator be, in order to obtain the best end point
In acid-base equilibria, the strength of acids and bases are reflected by their Ka's and Kb's, respectively. Explain, using examples while Ksp cannot directly reflect the solubility of the ionic compound. When can Ksp be used to directly compare t..
A sample of air at 15 psi is compressed at constant temperature from 555ml to 275ml. Calculate the resulting pressure.
Calculate the change in heat when 17.25 g of water vapor (steam) at 100.0 degrees C condenses to liquid water and then cools to 10.00 degrees C
BH+ClO4- is a salt formed from the base B (Kb = 1.00 × 10?4) and perchloric acid. It dissociates into BH+, a weak acid, and ClO4- , which is neither an acid nor a base. Find the pH of 0.100 M BH+ClO4-.
A metal sample weighing 124.10 g and at a temperature of 99.3 C was placed in 42.87 g of water in a calorimeter at 23.9 C. At equilibrium the temperature of the water and metal was 41.6 C.
The entropy of hydration becomes additional negative from Na+ to Mg2+ to Al3+ though the coordination number is probably 6 in each case. Account for the trend in disorder.
A buffer is 0.282 M C6H5COOH (aq) and 0.282 M NA(C6H5COO)(aq). Calculate the pH after the addition of 0.150 moles of nitric acid to 1.0 L of the buffer.
LON-CAPA Pre-Equilibria Conditions in Reaction MechanismsPre-Equilibria Conditions in Reaction Mechanisms
A 0.3000 g sample of carboxylic acid is burned in oxygen producing 0.5349 g of CO2 and 0.2202 g of H20. Find out the empirical formula of the carboxylic acid.
Draw the Lewis structure for NOF. Nitrogen is the central atom. Include all lone pairs of electrons.
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