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Define first ionisation energy

Remember that ionisation energy is an endothermic process, in which energy from the chemical system is used to remove electrons from atoms in the GASEOUS STATE.
OC
Answered by Obioma C. • Chemistry tutor
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Explain how a coordinate bond forms

A coordinate bond is a bond formed through the donation of a lone pair of electrons from an atom bonding to another atom which has an empty orbital.The lone pair from one atom is donated to the empty orbital...
TM
Answered by T M. • Chemistry tutor
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How do I predict the shape of a molecule?

Step 1: Using the periodic table, find how many electrons are in the outer shell of the central atom. Step 2: Add one electron for every other atom that the central atom is bound to. Step 3: Look at the net ...
JG
Answered by Joe G. • Chemistry tutor
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Calculate the empirical formula of a compound containing 77.7% Iron and 22.3% of oxygen.

An empirical formula is the simplest whole number ratio of atoms of each element present in the compound.1) Divide by atomic relative mass to find the number of moles. 2) Find a ratio between the moles. 3) D...
JS
Answered by Jeel S. • Chemistry tutor
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A solution of acetic acid and sodium acetate was prepared, by dissolving 4.1 g of sodium acetate in 750 cm^3 of 0.085 mol/dm^3 acetic acid, at 25 degrees. 10 Cm^3 of 2 mol/dm^3 HCl was added. Ka is 1.76*10^-5, calculate and explain the change in pH

The first thing to do in any calculations question is to list out what you have, and what the question is asking you. In this case, the question wants pH, which is -log[H+]. So what we need is [H+]. We have ...
AM
Answered by Alex M. • Chemistry tutor
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