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Nataly [62]
2 years ago
10

I’ll really appreciate it if you help me out on these 2 questions.

Chemistry
1 answer:
nasty-shy [4]2 years ago
5 0

Answer:

13. A

14. C

Explanation: i tried my best

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Which of these is an oxidation half-reaction?
sweet [91]

Answer:

the answer is Fe + 02 - Fe203

Explanation:

4 0
3 years ago
A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.155 g of this subunit w
olga_2 [115]

Answer : The molar mass of protein is, 1.38\times 10^4g/mol

Explanation :

Formula used :

\pi =CRT\\\\\pi=\frac{w\times 1000}{M\times V}RT

where,

\pi = osmotic pressure  = 0.138 atm

C = concentration

R = solution constant  = 0.0821 L.atm/mol.K

T = temperature  = 28^oC=273+28=301K

w = mass of protein subunit = 0.155 g

M = molar mass of protein subunit = ?

V = volume of solution  = 2.00 mL

Now put all the given values in the above formula, we get:

\pi=\frac{w\times 1000}{M\times V}RT

0.138atm=\frac{0.155g\times 1000}{M\times 2.00ml}\times (0.0821L.atm/mole.K)\times (301K)

M=13878.17g/mol=1.38\times 10^4g/mol

Therefore, the molar mass of protein is, 1.38\times 10^4g/mol

6 0
3 years ago
How many milliliters of an aqueous solution of 0.227 M sodium carbonate is needed to obtain 3.55 grams of the salt?
Marianna [84]

Answer:

147.6 mL .

Explanation:

sodium carbonate , Na₂CO₃

Molecular weight = 106

3.55 gm of sodium carbonate = 3.55 / 106

= .0335 moles

Let the volume of litre required = V

V litre of .227 M solution will contain

V x .227 moles of sodium carbonate . So

V x .227 = .0335

V = .1476 L

= 147.6 mL .

8 0
3 years ago
Which of the following pairs of elements are most likely to form an ionic bond?
gregori [183]

Answer:

Ionic bonds ussally form with a metal, and a non metel elements, so the answer would most likley be B.

Explanation:

hope I could help

5 0
3 years ago
Which statement is true about the plasma membrane?
Genrish500 [490]

Answer:

1st one is right..it helps filter waste inside the cell.

5 0
3 years ago
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