Top answers

Chemistry
A Level

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 t...

Answered by Maciej W. Chemistry tutor
1732 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 i...

Answered by Caroline W. Chemistry tutor
79960 Views

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 toge...

Answered by Hannah B. Chemistry tutor
31920 Views

When using cm3 as the unit for volume to calculate the concentration why must you divide the cm3 by 1000?

As I’m sure you already know, the units of concentration are mol dm-3. So before we calculate concentrations we must convert the volu...

Answered by Hannah B. Chemistry tutor
18033 Views

What is the trend in ionization energy across period 3 in the periodic table?

Ionization energy generally increases across period 3 because the nuclear charge increases but the shielding of the outer electrons remains relatively the same. This means that the electrostatic force of ...

Answered by Tamara A. Chemistry tutor
117645 Views

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