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Why do acids have low pHs and alkaline solutions have high pHs?

The pH scale is a measure of how many H + ions there are in a solution. The higher the concentration of H + , the lower the pH and the more acidic the solution is. For example, for HCl, dissociation can occu...
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Answered by Hannah B. • Chemistry tutor
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Work out the shape of an SF6 molecule

To work out the shape of the SF6 molecule we can use a simple equation which allows us to work out the number of electron pairs. The equation is (old group + electrons donated +/- charge) / 2. If the charge ...
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Answered by Maciej W. • Chemistry tutor
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State and explain the general trend in first ionization energy as you move across the period from left to right.

As you move across the period you are adding one more proton which increases the nuclear charge, you are also adding one more electron, however, the shielding provided by the extra electron is less than the ...
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Answered by Maciej W. • Chemistry tutor
2755 Views

Why is CO2 a linear molecule whereas H2O has a v-shaped geometry?

This is due to the different numbers of electrons in each molecule and VSEPR (Valence Shell Electron Repulsion) theory. This theory states that as electrons are negatively charged, the valence electrons in d...
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Why do ionic compounds like NaCl conduct electricity when dissolved but not when they’re solid, whereas metals conduct electricity when they’re solid?

Firstly, it's important to recognise that ionic compounds and metals are two different structures. Ionic compounds consist of positively charged ions and negatively charged ions held together by strong elect...
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Answered by Hannah B. • Chemistry tutor
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