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Unit conversions

The volume of a micelle has been measured as 100,000 Å3. What is this volume in cm3?
Express your answer as an index (such as: 1099)

100,000 Å3 = 10Answercm3


is it 10^-24 cm3?

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Reply 1
Original post by Lufthansa
The volume of a micelle has been measured as 100,000 Å3. What is this volume in cm3?
Express your answer as an index (such as: 1099)

100,000 Å3 = 10Answercm3


is it 10^-24 cm3?


What is A
Reply 2
Original post by TenOfThem
What is A

Angstrom
Reply 3
Original post by Lufthansa
Angstrom


That does not help - you have given us no information that enables us to convert between A and cm
Reply 4
Original post by TenOfThem
That does not help - you have given us no information that enables us to convert between A and cm

1 A = 10^-8 cm
Reply 5
Original post by Lufthansa
1 A = 10^-8 cm


So 1A3=1024cm31 A^3 = 10^{-24} cm^3

And you need 100000 A3A^3
Reply 6
Original post by TenOfThem
So 1A3=1024cm31 A^3 = 10^{-24} cm^3And you need 100000 A3A^3


so will it be 10^-19 ?
Reply 7
Original post by Lufthansa
so will it be 10^-19 ?


Based on what you have told me, yes
Reply 8
Original post by TenOfThem
Based on what you have told me, yes

Express your answer in index form, rounding the first box to 1 d.p. (See instructions)

1.4 L = Answer x 10Answer cm3


this one would it be

1.4 x10^3 ?
Reply 9
Original post by Lufthansa
Express your answer in index form, rounding the first box to 1 d.p. (See instructions)

1.4 L = Answer x 10Answer cm3


this one would it be

1.4 x10^3 ?



Is L litres
Reply 10
Original post by TenOfThem
Is L litres

yes
Original post by Lufthansa
yes


then, yes
Reply 12
Original post by TenOfThem
then, yes

1 nm3 = 10Answermm3


Original post by Lufthansa
1 nm3 = 10Answermm3




You need to tsp asking

you know how to do these
Reply 14
Original post by TenOfThem
You need to tsp asking

you know how to do these


is it 10^-18 ?
Original post by Lufthansa
is it 10^-18 ?


yes
Reply 16
Original post by TenOfThem
yes

A pharmacist prepares a solution of NaCl of 1 M. They then dilute it four times: first 10-fold, and then 10-fold again, and so on.
Express the concentrations of the four salt solutions in index form in units of mol.dm-3
(Put the answer as 10x in each box)
10Answer; 10Answer; 10Answer; 10Answer

do you know this one?im stuck
Original post by Lufthansa
A pharmacist prepares a solution of NaCl of 1 M. They then dilute it four times: first 10-fold, and then 10-fold again, and so on.
Express the concentrations of the four salt solutions in index form in units of mol.dm-3
(Put the answer as 10x in each box)
10Answer; 10Answer; 10Answer; 10Answer

do you know this one?im stuck


I find Moles confusing - Actually I find Chem confusing generally
Reply 18
Original post by Lufthansa
A pharmacist prepares a solution of NaCl of 1 M. They then dilute it four times: first 10-fold, and then 10-fold again, and so on.
Express the concentrations of the four salt solutions in index form in units of mol.dm-3
(Put the answer as 10x in each box)
10Answer; 10Answer; 10Answer; 10Answer

do you know this one?im stuck


The NaCl is initially 1 M (1 moldm^-3 -- concentration)

If you dilute something 10 fold, you're making the volume 10x bigger, hence making the concentration 10 times smaller. So one 10-fold dilution leads to:

110moldm3=1×101moldm3\frac{1}{10} moldm^{-3} = 1\times10^{-1} moldm^{-3}

If you were to 10 fold it again, you'd get a tenth of that:

1100moldm3=1×102moldm3\frac{1}{100} moldm^{-3} = 1\times10^{-2} moldm^{-3}

So on and so forth
(edited 10 years ago)
Original post by TenOfThem
I find Moles confusing - Actually I find Chem confusing generally

It's just applied maths. If you tried, I'm sure you'd fine it easy.

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