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Anna71 [15]
3 years ago
15

Any collection of things that have some influence on one another can be thought of as a system. When we talk about a system, we

are also talking about all the parts that should be included, how those parts interact with one another, and to how the system as a whole relates to other systems. Consider the water cycle on Earth. Scientists have hypothesized about how climate change, specifically global warming, could impact the water cycle and therefore life on Earth. Scientists might consider specific research questions regarding this topic. They would include which questions listed above? A) I and II B) I, II, IV C) I and III D) I, II, III, IV
Chemistry
1 answer:
schepotkina [342]3 years ago
3 0

Answer:

d

Explanation:

d sound =s the back

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The half life of plutonium-239 (239pu, pu-239) is 24,100 years. How much plutonium will remain after 1000 years if the initial a
Anestetic [448]

The mass of plutonium that will remain after 1000 years if the initial amount is 5 g when the half life of plutonium-239 (239pu, pu-239) is 24,100 years is 2.5 g

The equation is Mr=Mi(1/2)^n

where n is the number of half-lives

Mr is the mass remaining after n half lives

Mi is the initial mass of the sample

To find n, the number of half-lives, divide the total time 1000 by the time of the half-life(24,100)

n=1000/24100=0.0414

So Mr=5x(1/2)^1=2.5 g

The mass remaining is 2.5 g

  • The half life is the time in which the concentration of a substance decreases to half of the initial value.

Learn more about half life at:

brainly.com/question/24710827

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8 0
1 year ago
Water boils at 100⁰C. What is the temperature on the Kelvin scale?
denis23 [38]
The correct answer is D
7 0
3 years ago
which of the following compounds exhibits dipole -dipole forces as its strongest attraction between molecules? o2,ch3Br,CCl4,He,
Archy [21]

Answer:

B. CH3Br

Explanation:

Dipole -Dipole interactions take place in polar molecules.

CH3Br exhibits dipole -dipole forces as its strongest attraction between molecules because it is a polar molecule due to the slightly negative dipole present on the Br molecule.

While O2 is a nonpolar molecule due to its linear structure, CCl4 has zero resultant dipole moment, Helium is non-polar and BrCH2CH2OH is a non polar compound having net dipole moment is zero.

Hence, the correct option is B. CH3Br.

3 0
3 years ago
Why do organisms need nitrogen?
RSB [31]
<span>All bulbs/plants and creatures </span>want nitrogen<span> to produce amino hallucinogen, proteid and DNA, although this </span>nitrogen<span> in the air is not in a manner that everybody can use.

For more information, look at the appendage below!</span>

6 0
3 years ago
What does the kinetic theory describe? A. The transfer of atoms in reactions B. The energy of atomic orbitals C. The reactivity
Alenkasestr [34]
I believe the answer you're looking for is, D. The motion of atoms and molecules. 
4 0
3 years ago
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