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How are trends in ionisation energy explained?

Horizontal trend: First ionisation energies increase going to the right in a period. This is due to an increase in the atomic mass (and number of protons) and hence in the electrostatic attraction between th...
MC
Answered by Miruna C. • Chemistry tutor
1832 Views

How to prove that Integral S 1/(a^2+x^2) dx= 1/a arctan(x/a) + C ?

In order to answer this question, at first we need to use the method of substitution. That means, we're trying to replace x with a different variable u. Lets use the substitution of x = a tan u, then du/dx =...
JW
Answered by Judyta W. • Maths tutor
8876 Views

What is the difference between Ionic and Covalent Bonding

Ionic Ionic bonding happens between metals and non-metals. The electrons in ionic bonding are given or taken. For example, Sodium + Chlorine --> Sodium Chloride. (Na + Cl --> NaCl ) Sodium only has one...
AT
Answered by Ananya T. • Chemistry tutor
2797 Views

Describe how Giraffes evolved long necks (3)

Due to natural variation due to mutations in their DNA, some giraffes in the population had longer necks. These longer necks enabled them to reach leaves higher up on the trees, which secured them a good sou...
RS
Answered by Roshan S. • Biology tutor
3833 Views

Compare and contrast the ways in which Bronte and McEwan present the journey from childhood to adulthood through their protagonists in Jane Eyre and Atonement.

Both writers use the openings of their narratives to foreshadow the struggle that their protagonist will have to endure during their journey from youth to maturity. Bronte’s narrative decision to use symboli...
LW
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