Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

BIOCHEMISTRY > CALCULATIONS > Flashcards

CALCULATIONS Flashcards

1
Q

WHAT IS PERCENT CONCENTRATION?

A

1 g of a solute is found in 100 g of the solution
g / 100g

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

WHAT IS MOLARITY?

A

1 mol of a solute is found in 1000 ml (= 1l) of the solution
M = mol / 1000ml

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

WHAT IS CONCENTRATION?

A

ratio of amount of solute / ratio of amount of solution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

CALCULATE THE PERCENT CONCENTRATION OF THE SOLUTION CONTAINING 5g OF NaCL IN 1000g OF THE SOLUTION

A

5g / 1000g x 100 = 0.5%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

CALCULATE THE MOLAR CONCENTRATIONS OF THE SOLUTION CONTAINING 20g OF NaOH IN A 1L SOLUTION

A

mass = molar weight x moles
1mol NaOH = 40g
1/40g/mol = 1g
1/40g/mol x 20g = 0.5mol/L

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

CALCULATE THE MASSES OF SOLUTE NEEDED TO PREPARE 100ml OF A 2M NaCL SOLUTION

A

CONCENTRATION = mass of solute / mass of solution
2 = moles / 0.1L
moles = 0.2
mass = 0.2 x 58.5 = 11.7g/mol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

CALCULATE THE MASSES OF SOLUTE NEEDED TO PREPARE 200g OF A 0.5% SOLUTION OF NaOH

A

CONCENTRATION = mass of solute / mass of solution
0.5 = mass of solute / 200g
0.5 x 0.2 = 1g/mol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

WHAT HAPPENS AS THE VOLUME OF A SOLUTION INCREASES?

A

the concentration decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

WHAT IS THE FORMULA FOR CONCENTRATION?

A

c = n/ V

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

0.5L OF A 1M NaCL SOLUTION WAS DILUTED TO 0.25M SOLUTION

a) HOW MANY TIMES WAS THE SOLUTION DILUTED
b) WHAT IS THE VOLUME OF THE SOLUTION AFTER DILUTION

A

a) original conc / diluted conc = 1 M / 0.25 M
= 4 times diluted
b) diluted X4 so the volume will have increased X4 = 0.5L x 4 = 2L

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

2ml OF URINE SAMPLE HAS BEEN DILUTED BY 198ml OF WATER. THE SAMPLE WAS THEN PROCESSED TO DETERMINE UREA CONCENTRATION, WHICH WAS 4.5mmol. WHAT IS THE UREA CONCENTRATION IN THE UNDILUTED URINE?

A

2 ml / 200ml = 1 /100 dilution
100 x 4.5 = 450mmol/L

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

1 mol = _____mmol

A

1000 / 10^3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

1 mmol = _______mol

A

0.001 / 10^-3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

1 mmol = _________umol

A

1000 (umol = 10^-6 mol)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

1umol = ______mmol

A

0.001

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

1mg/dl = _________mmol/l
(cholesterol)

A

0.0259

17
Q

THE AMOUNT OF PLASMA IN A HUMAN BODY IS ON AVERAGE 3.5L. THE PLASMATIC SODIUM CATION CONCENTRATION IS 140mmol/L. WHAT IS THE TOTAL MASS OF SODIUM IN PLASMA?

A

140mmol/L = 0.14mol/L
3.5L = 0.49mol/L

1mol = 23g of Na
0.49mol = 23g x 0.49 = 11.27g of sodium in plasma

18
Q

1mg/ml = _____mmol/L

A

21.74

19
Q

1g = ________mg

A

1000

20
Q

1umol = ________nmol

A

1000 (nmol = 10^-9 of a mole)

21
Q

1nmol = _________umol

A

0.001

22
Q

1nmol = ________pmol

A

1000 (pmol = 10^-12 of a mol)

23
Q

1pmol = _______nmol

A

0.001

24
Q

1kJ = __________J

A

10 000

25
Q

1 g/dl = _______g/l

A

10

BIOCHEMISTRY (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions