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2 years ago

WILL MARK BRAINLIEST

Chemistry

2 answers:

ivolga24 [154]2 years ago

4 0

D. Theories

Scientific theories are the best explanations so far to explain a pattern seen in nature.

natta225 [31]2 years ago

4 0

Scientific theories are the best explanations so far to explain a pattern seen in nature.

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The mass percent of carbon in a typical human is 18%, and the mass percent of 14C in natural carbon is 1.6 × 10-10%. Assuming a

Tema [17]

Answer:

4066 decay/s

Explanation:

Given that:-

The weight of the person is:- 190 lb

Also, 1 lb = 453.592 g

So, weight of the person = 86182.6 g

Also, given that carbon is 18% in the human body. So,

$\%\ Carbon=\frac{18}{100}\times 86182.6\ g=15512.868\ g$

Carbon-14 is $1.6\times 10^{-10}\ \%$ of the carbon in the body. So,

$\%\ Carbon-14=\frac{1.6\times 10^{-10}}{100}\times 15512.868\ g=2.48\times 10^{-8}\ g$

Also,

14 g of Carbon-14 contains $6.023\times 10^{23}$ atoms of carbon-14

So,

$2.48\times 10^{-8}\ g$ of Carbon-14 contains $\frac{6.023\times 10^{23}}{14}\times 2.48\times 10^{-8}$ atoms of carbon-14

Atoms of carbon-14 = $1.07\times 10^{15}$

Given that:

Half life = 5730 years

$t_{1/2}=\frac {ln\ 2}{k}$

Where, k is rate constant

So,

$k=\frac {ln\ 2}{t_{1/2}}$

$k=\frac{ln\ 2}{5730}\ years^{-1}$

The rate constant, k = 0.00012 years⁻¹

Also, 1 year = $3.154\times 10^7$ s

So, The rate constant, k = $\frac{0.00012}{3.154\times 10^7}$ s⁻¹ = $3.8\times 10^{-12}\ s^{-1}$

Thus, decay events per second = $K\times atoms decayed$ = $3.8\times 10^{-12}\times 1.07\times 10^{15}\ decay/s$ = 4066 decay/s

4 0

3 years ago

Which category does the ion PO43- belong to?

Katena32 [7]

Answer:

c polyatomic anion

Explanation:

8 0

2 years ago

Can someone help me plz

Sidana [21]

That answer is what characteristic you have.

4 0

3 years ago

The surface tension of water is 7.28 ✕ 10−2 J/m2 at 20°C. Predict whether the surface tension of heptane would be higher or lowe

stira [4]

Answer:

Lower

Explanation:

Surface tension occurs because molecules at the surface do not have molecules above them, so they cohere more strongly to their neighbours.

The stronger cohesive forces make it more difficult to move an object through the surface than when it is beneath the surface.

The attractive forces in water are strong because of hydrogen bonding.

A hexane molecule is nonpolar, so the only attractions are the weak London dispersion forces.

The cohesive forces at the surface are much lower than those in water, so the surface tension of hexane is lower than that of water at the sane temperature.

3 0

3 years ago

Large quantities of tritium were released into the atmosphere in the 1950s and 1960s during atmospheric nuclear testing. This tr

Sergeu [11.5K]

The ocean
hope I helped

8 0

2 years ago

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