# Emi K

First Year Med Student at Notts | many years experience as a Tutor :)

6658Students helped
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Maths

Asked by David · 2 years ago

The following are chemical entities identifiable during qualitative analysis: i. SO 2− 4 ii. H3O+ iii. NH + 4 iv. OH− Which of them can be detected by litmus paper? Options A) ii and iv only B) ii only C) i and iii only D) iv?

Litmus paper is used to determine if a substance is acid or an alkaline. So for this question you have to ask your self which one of the options are an acid or alkaline. i. SO4^-2 is neither an acid or base. ii. H3O^+ is in fact a hydrated hydrogen ion therefore it is an acid. iii. NH4^+ is an acid as it can release a H+ ion into solution iv. OH- is alkaline. Therefore, it can be between ii... more

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Asked by Elouise · 2 years ago

I don’t think I’ll pass my maths, yet all my other grades should be fairly good. Can I get into sixth form?

Hiya Elouise! It mainly depends on what you would like to do at A Level to know how important of an effect this can have. However, some sixth form do give you the option of studying your chosen subject at A Level as long as you are able to continue and resit you’re Maths GCSE the consecutive year or next available chance. :)

Maths

Asked by Mia · 2 years ago

It I invest £12000 in a saving account the account pays 1.5% compound interest per year what is the value of her investment after 2 years?

Formula for compound interest: original x multiplier^years 1.5% increase as a multiplier is 1.015 [you do 1 + (% x 100) as it’s % increase] 12000 x 1.015^2 = £12362.70 If you have any more questions- feel free to message me :)

Maths

Asked by Mr · 2 years ago

Helen draws a random circle. she then measure it diameter and circumference. should get a circumference, C, of 405mm correct to 3 significant figures she get a diameter, D, of 130mm correct 2 significant figures. Lower and upper bound of C/D?

Lower Bound: C = 404.5 mm D = 125 mm Upper Bound: C = 405.5 mm D = 135 mm Circumference is rounded to the nearest 1mm, therefore when working out the boundaries for that you do +/- 0.5 (half of 1) Diameter is rounded to the nearest 10mm, therefore when working out boundaries for that you do +/- 5 (half of 10) Hope this helps :)

# Emi K

First Year Med Student at Notts | many years experience as a Tutor :)

6658Students helped