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Chemistry
A Level

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 n...

Answered by Joe G. Chemistry tutor
1658 Views

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...

Answered by Jeel S. Chemistry tutor
3288 Views

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 ha...

Answered by Alex M. Chemistry tutor
2546 Views

Explain the resistance to bromination of benzene in comparison to phenol.

In phenol, one of the lone pairs of electrons in a p-orbital of the oxygen atom in the -OH group overlaps with the delocalised ring of electrons in the ring. This lone pair is partially d...

Answered by Cerys H. Chemistry tutor
2714 Views

Explain why benzene requires use of a halogen carrier catalyst to react with bromine while phenol does not.

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