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Chemistry
A Level

What is a bond?

Atoms can be modelled as point positive charges with clouds of electrons around them. When two atoms come together close enough, a region of higher electron density forms between the two atoms. This means...

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Answered by Rokas E. Chemistry tutor
2071 Views

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...

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Answered by Esther W. Chemistry tutor
2209 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 ...

JL
Answered by Jacob L. Chemistry tutor
2675 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...

FB
Answered by Felix B. Chemistry tutor
14082 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 ...

LM
Answered by Lloyd M. Chemistry tutor
48905 Views

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