Using the graphs below, which group of moths is better adapted to survive the hunting cycle?

Chemistry

1 answer:

kolbaska11 [484]3 years ago

3 0

I don't know the details of the individual

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Radium-221 has a half-life of 30 sec. How long will it take for 96% of a sample to decay?

monitta

We can calculate how long the decay by using the half-life equation. It is expressed as:

A = Ao e^-kt

where A is the amount left at t years, Ao is the initial concentration, and k is a constant.
From the half-life data, we can calculate for k.

1/2(Ao) = Ao e^-k(30)
k = 0.023

0.04Ao = Ao e^0.023(t)
t = 140 sec

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3 years ago

2. What effect does adding a neutron have on the atom’s mass?

anyanavicka [17]

It does, however, change the mass of the nucleus. Adding or removing neutronsfrom the nucleus are how isotopes are created. Protons carry a positive electrical charge and they alone determine the charge of the nucleus.

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3 years ago

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AleksandrR [38]

Answer:

Explanation:

A or B

I would say B do

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A 3.82 g piece of limestone contains 2.62 g of CaCO3

Kobotan [32]

Considering the definition of percentage by mass, the mass percentage of CaCO₃ is 68.59%.

<h3>What is mass percentage</h3>

The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.

In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

$mass percentage=\frac{mass of solute}{mass of solution}x100$