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PSYCHO15rus [73]
3 years ago
6

One scientific investigation may result in

Chemistry
2 answers:
Paladinen [302]3 years ago
4 0

Answer:

a new discover a new theory

ad-work [718]3 years ago
3 0

Answer:

D:All of these

Explanation:

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The carbon-14 content of a wooden harpoon handle found in an Inuit archaeological site was found to be 61.9% of the carbon-14 co
astraxan [27]

Answer:

3,964 years.

Explanation:

  • It is known that the decay of a radioactive isotope isotope obeys first order kinetics.
  • Half-life time is the time needed for the reactants to be in its half concentration.
  • If reactant has initial concentration [A₀], after half-life time its concentration will be ([A₀]/2).
  • Also, it is clear that in first order decay the half-life time is independent of the initial concentration.

  • The half-life of the element is 5,730 years.

  • For, first order reactions:

<em>k = ln(2)/(t1/2) = 0.693/(t1/2).</em>

Where, k is the rate constant of the reaction.

t1/2 is the half-life of the reaction.

∴ k =0.693/(t1/2) = 0.693/(5,730 years) = 1.21 x 10⁻⁴ year⁻¹.

  • Also, we have the integral law of first order reaction:

<em>kt = ln([A₀]/[A]),</em>

where, k is the rate constant of the reaction (k = 1.21 x 10⁻⁴ year⁻¹).

t is the time of the reaction (t = ??? year).

[A₀] is the initial concentration of the sample ([A₀] = 100%).

[A] is the remaining concentration of the sample ([A] = 61.9%).

∴ t = (1/k) ln([A₀]/[A]) = (1/1.21 x 10⁻⁴ year⁻¹) ln(100%/61.9%) = 3,964 years.

7 0
3 years ago
One way in which elements differ from each other is the structure of the electron cloud in each elements Atoms in electron cloud
BartSMP [9]

Not sure what you are asking. I have two possible answers though...

It could either be more negatively charged, or valence electrons.

The more away from the nucleus a electron is, the more negatively charged it is.

The electrons on the outermost electron shell is valence electrons.

Again, I don't know what you were asking, but one of these answers may be correct.

4 0
3 years ago
Read 2 more answers
Use the drop-down menus to label each of the following changes P for physical change and C for the chemical change. The substanc
dlinn [17]

Answer:

Chemical, Physical, Chemical, Chemical, Physical!!

Explanation:

I just did it correctly.

6 0
3 years ago
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water is formed when 48g of oxygen combine with 6g of hydrogen. what mass of oxygen combines with 2g of hydrogen
Mariulka [41]

Answer:

16g of oxygen reacts with 2 g of hydrogen to form 18g of Water

6 0
2 years ago
2) If 100.0 J of heat are added to 20.0 g of water at 30.0°C, what will be the final
anzhelika [568]
The final temperature of the water will be 31.2 °C... i don’t know the second one sorry :(
3 0
2 years ago
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