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Describe the bonding in, and the structure of, sodium chloride and ice. Explain why they have very different melting points.

(Firstly, we identify this as a ‘Structure and Bonding’ problem and try to distinguish between the bonds holding atoms together and the intermolecular forces holding molecules together. We can take each comp...
GK
Answered by Georgia K. • Chemistry tutor
21607 Views

When should I use the subjunctive?

The subjunctive isn't a tense (like the present, past or conditional), it's a mood used to express thoughts, possibility or necessity. The subjunctive is triggered by certain verb structures that you will ne...
IT
Answered by ISABELLE T. • French tutor
2143 Views

Explain how pressure differences in the heart ensure sufficient pumping of blood into the arteries. (3)

increased pressure in the ventricles the pressure in the ventricles is higher than the pressure in the atria causing the atrioventricular valves to closecausing the semilunar valves to open and the blood flo...
KW
Answered by Kelly W. • Biology tutor
4348 Views

Tu portes un uniforme scolaire? Que penses-tu de ça? Tu es pour ou contre l'uniforme?

Oui, je porte un uniforme scolaire. On a deux types: un uniforme pour les jours où on a sport, et un uniforme pour les autres jours. J'aimerai porter mes propres habits, de pouvoir choisir ce que je vais met...
YS
Answered by Yasmine S. • French tutor
4658 Views

Given f(x)=2x^3 - 2x^2 + 8x, find f'(x) and f"(x).

The first step in scoring full marks on this typically 4 mark question is to recognise what it's asking you to do. We use the process of differentiation to solve it. f(x)=2x^3 - 2x^2 + 8xf'(x) = 6x^2 - 4x + ...
Answered by • Maths tutor
4198 Views