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Chemistry
A Level

Name and explain briefly the main stages of mass spectroscopy.

Mass spectroscopy is a highly sensitive method of analysing samples of elements and determining the isotopes present and their relative amounts. We can break down the method into four major steps: (in ord...

Answered by Esther W. Chemistry tutor
1841 Views

What causes a chemical reaction to happen?

There are two aspects to this question: thermodynamics and kinetics.
It is a fundamental law that the entropy of the universe must increase for a process to be feasible. This implies that the Gibbs ...

Answered by Jacob L. Chemistry tutor
2280 Views

A buffer solution is made with a pH of 5.000. Solid sodium ethanoate, CH3COONa, is added to 400 cm^3 of 0.200 mol dm^–3 ethanoic acid (Ka = 1.75 × 10^–5 mol dm^–3). Calculate the mass of sodium acetate that must be dissolved in the acid to prepare this

There are three steps:
Calculate [CH3COO] using the equation for KaCalculate the moles of CH3COO using the equation concentration = moles/volu...

Answered by Felix B. Chemistry tutor
12896 Views

Explain the trend in melting points of the period 3 elements

There are four main areas we need to consider in answering this question. The first is Sodium, Magnesium and Aluminium. These are all metals and so have a metallic bonding structure. As you go across the ...

Answered by Lloyd M. Chemistry tutor
43656 Views

Can you explain the bond angle and shape of the molecule NH3?

In NH3, the nitrogen atom is bonded to three hydrogen atoms. By drawing the Lewis structure, the central nitrogen atom shows 3 covalent bonds to hydrogen and one lone pair. Valence Shell Electron Pair Rep...

Answered by Jenny J. Chemistry tutor
12243 Views

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