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# Unit conversions watch

1. The volume of a micelle has been measured as 100,000 Å3. What is this volume in cm3?

is it 10^-24 cm3?
2. (Original post by Lufthansa)
The volume of a micelle has been measured as 100,000 Å3. What is this volume in cm3?

is it 10^-24 cm3?
What is A
3. (Original post by TenOfThem)
What is A
Angstrom
4. (Original post by Lufthansa)
Angstrom
That does not help - you have given us no information that enables us to convert between A and cm
5. (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
6. (Original post by Lufthansa)
1 A = 10^-8 cm
So

And you need 100000
7. (Original post by TenOfThem)
So And you need 100000
so will it be 10^-19 ?
8. (Original post by Lufthansa)
so will it be 10^-19 ?
Based on what you have told me, yes
9. (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)

this one would it be

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

this one would it be

1.4 x10^3 ?

Is L litres
11. (Original post by TenOfThem)
Is L litres
yes
12. (Original post by Lufthansa)
yes
then, yes
13. (Original post by TenOfThem)
then, yes

14. (Original post by Lufthansa)

you know how to do these
15. (Original post by TenOfThem)

you know how to do these
is it 10^-18 ?
16. (Original post by Lufthansa)
is it 10^-18 ?
yes
17. (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)

do you know this one?im stuck
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)

do you know this one?im stuck
I find Moles confusing - Actually I find Chem confusing generally
19. (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)

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:

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

So on and so forth
20. (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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