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Sedbober [7]
3 years ago
15

New crust is constantly being formed on earth's surface True False

Chemistry
1 answer:
mezya [45]3 years ago
7 0
Answer: True, I am pretty sure. Hope this helps!
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Uranium-238 decays to lead-206 with a half-life of 4.5 x 109 yr. Determine how much uranium-238 decays in milligrams (to three s
Mamont248 [21]

Answer:

2.15 mg of uranium-238 decays

Explanation:

For decay of radioactive nuclide-

                        N=N_{0}.(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}

where N is amount of radioactive nuclide after t time, N_{0} is initial amount of radioactive nuclide and t_{\frac{1}{2}} is half life of radioactive nuclide

Here N_{0}=4.60 mg, t=4.1\times 10^{9}yr and t_{\frac{1}{2}}=4.5\times 10^{9}yr

So,N=(4.60mg)\times (\frac{1}{2})^{\frac{4.1\times 10^{9}}{4.5\times 10^{9}}}

so, N = 2.446 mg

mass of uranium-238 decays = (4.60-2.446) mg = 2.15 mg

3 0
3 years ago
When there is an imbalance in a body system, and the body cannot maintain homeostasis, how might other systems respond?
Ulleksa [173]
Other systems in the body might respond with cramps or overheating, which might eventually kill you, if not taken care of in time. Hope this helps!
8 0
4 years ago
The actual yield of a product in a reaction was measured as 4.20 g. If the theoretical yield of the product for the reaction is
Dmitry_Shevchenko [17]

Answer:

3

Explanation:

remember the equation percentage yield = actual/ theoretical yield as

4.20/4.88 x 100

86.065 so 86.1.

hope this make sense:)

3 0
3 years ago
What is the difference between alcoholic fermentation and lactic acid fermentation?
MissTica
Fermentation occurs when there is a lack of oxygen. Alcoholic fermentation occurs in plants such as yeast. Whereas, Lactic acid fermentation occurs in humans and when we are deprived of oxygen.
8 0
4 years ago
Read 2 more answers
Please help! I put all my points into this question, brainliest, thanks, rattings, etc.
kkurt [141]

A higher concentration of reactants leads to more collisions per unit time and leads to an increasing reaction rate. Changing the pressure of gaseous reactants is, in effect, changing their concentration. The increased number of collisions caused by a higher pressure generally increases the reaction rate.


8 0
4 years ago
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