The radioactive isotope used in the dating of fossils thought to be less than 40,000 years old is ________________.

1 answer:

8 0

Answer:

The answer is Radiocarbon

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UkoKoshka [18]

The answer is C) Coloniza.

7 0

3 years ago

iogann1982 [59]

Answer:

2.28 × 10^-3 mol/L

Explanation:

The equation for the equilibrium is

CN^- + H2O ⇌ HCN + OH^-

Ka = 4.9 × 10^-10

KaKb = Kw

4.9 × 10^-10 Kb = 1.00 × 10^-14

Kb = (1.00 × 10^-14)/(4.9 × 10^-10) = 2.05 × 10^-5

Now, we can set up an ICE table

CN^- + H2O ⇌ HCN + OH^-

I/(mol/L) 0.255 0 0

C/(mol/L) -x +x +x

E/(mol/L) 0.255 - x x x

Ka = x^2/(0.255 - x) = 2.05 × 10^-5

Check for negligibility

0.255/(2.05 × 10^-5) = 12 000 > 400. ∴ x ≪ 0.255

x^2 = 0.255(2.05 × 10^-5) = 5.20 × 10^-6

x = sqrt(5.20 × 10^-6) = 2.28 × 10^-3

[OH^-] = x mol/L = 2.28 × 10^-3 mol/L

5 0

3 years ago

dimulka [17.4K]

The substance that made up of a particular mixture can be regarded as Solute and solvent

A mixture can be regarded as material which is made up of more than one different Chemical substance or substances , whereby they are not chemically combined.

A mixture can be regarded as physical combination involving two or more substances whereby each entities identities are retained, then mixed in the form such as ;