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Explain why chlorine (Cl2) is a gas at room temperature, but sodium chloride (NaCl) is a solid at room temperature.

The melting/boiling point of a substance determines what state of matter it takes at a certain temperature. In Cl2 there are covalent bonds between the atoms forming simple molecules. There are weak attracti...
LW
Answered by Lily W. • Chemistry tutor
178591 Views

At what temperature does the reaction become feasible? When ΔH = 492.7 kJmol^-1 and ΔS = 542.6 JK^-1mol^-1.

When a reaction is feasible ΔG = 0. Rearrange the equation ΔG = ΔH - TΔS. So that when ΔG = 0, T = ΔH / ΔS. Must convert ΔS from JK^-1mol^-1 to kJK^-1mol^-1 by dividing it by 1000. Then plug in numbers given...
LW
Answered by Lily W. • Chemistry tutor
21421 Views

What's the best way of approaching the study of historiography?

Historiography is a term that in my experience unnecessarily frightens some people studying at A-level. In some ways it does represent a shift from simpler primary source based analysis, but in reality, the ...
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Answered by Ronan V. • History tutor
4889 Views

How to convert any binary number to decimal?

Let us take a binary number 10010111 . To make conversion easier let us write down numbers 0 to 7 under this binary number starting from the right side. These numbers will represent powers of 2. For each '1'...
MS
Answered by Mantas S. • Computing tutor
6629 Views

Solve the equation (2x+3)/(x-4)-(2x-8)/(2x+1)=1 and give the answer to 2 decimal places

To start off with we need to remove the two denominators (the bottom part of the fractions) on the left hand side of the equation. This can be achieved by multiplying the through the whole equation by (x-4)(...
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Answered by Jake J. • Maths tutor
9975 Views