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Why is 2-trichloroethanoic acid such a strong acid?

Cl is very electronegative, which makes it electron withdrawing. This means the three Cl substituents pull electrons from the O-H bond. This causes further polarisation of the O-H bond, which means there is ...
LS
Answered by Lucy S. • Chemistry tutor
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Which is the more powerful between a parliamentary and presidential system of governmentt?

Before answering this question it is necessary to consider the three branches of government: the executive, judiciary and the legislature. This enables us to evaluate the checks put on those in power, and th...
CG
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How would you work out the length of an hypotenuse, if the length of the opposite side is 3 cm and the length of the opposite side is 4 cm?

You would use Pythagoras theorem, which states, a^2 + b^2 = c^2. Where a is the opposite side to the angle, b is the side adjacent to the angle and c is the hypotenuse. So if a = 3 cm, and b = 4 cm, c^2 woul...
OA
Answered by Othniel A. • Maths tutor
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Solve the simultaneous equations: 2x+2y=12 x-y=8 You must show your working

The first thing we want to do is change the first equation so it's either all x's or all y's, we don't want a mixture. Now looking at the bottom equation, we can rearrange it by adding y to both sides. This ...
KA
Answered by Kasim A. • Maths tutor
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When a toothbrush is charging, p.d. across the primary coil is 230 V, p.d. across the secondary coil is 7.2 V. The primary coil in the charging base has 575 turns of wire on its coil. Find the number of turns on the secondary coil inside the toothbrush.

This question is on transformers. This is clear because there is a primary and secondary coil and a different voltage between the 2 coils. Transformers induce a changing voltage in a coil. The known equation...
JT
Answered by Jayani T. • Physics tutor
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