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3 years ago

How does radioactivity make it possible to understand how earth can be so old and still have a hot interior?

2 answers:

8 0

I know that we can find how old the Earth is by knowing how much uranium ultimately decayed into lead. Uranium-238 has a very long to decay, about 4.5 billion years. So that is how we are able to understand how old the Earth is.

Sophie [7]3 years ago

4 0

Answer:

The reason is that there are radioactive elements that are in the center of the earth.

Explanation:

If the earth were only a rock cooling from the time of its birth. It should have already cooled completely thousands of years ago. However, volcanoes continue to shed hot magma and this is proof that there is a source of heat in the center of the earth. This source of heat is due to the radioactivity of elements such as Uranium and Thorium that were enclosed during the formation of the earth. These elements slowly disintegrate emitting particles that collide with others emanating heat. For example, the half-life of uranium is 4.5 billion years, which means that it decays very slowly.

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Which statement is true about a catalyst?

mixas84 [53]

Answer:

Option B: It remains unused during the reaction

Explanation:

Just took the test and got it right.

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3 years ago

Any groups present on a benzene ring can impact the success and regioselectivity of an electrophilic aromatic substitution. Dete

r-ruslan [8.4K]

Answer:

Explanation:

In electrophilic aromatic substitution, the substituent(s) that favors electrophilic attack is said to be ortho or para to the substituent. Meta directors are deactivators. Altogether, these directors have an integral role to play in the success and regioselectivity of electrophilic aromatic substitution reactions.

From the information given: The;

Strongly deactivating meta- director ⇒ NO₂ (nitro group)

Moderately deactivating meta- director ⇒ CN (cyano group)

Strongly activating ortho-/para- director ⇒ OH (hydroxy; group)

Weakly deactivating ortho-/para- director ⇒ -X (halide group)

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3 years ago

Which of the following is not a major use of water?

Ivan

Answer:

international

Explanation:

because agricultural, industrial, residential

are major uses of water

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3 years ago

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Ghella [55]

Answer:

Lemonade is a man made material

Explanation:

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3 years ago

The gravitational force between two objects will be very small unless which of the following is true?

max2010maxim [7]

The statement that is true is one of the objects must have a very large mass.

The more the scale of the masses, the more the scale of the gravitational pressure (additionally referred to as the gravity pressure). The gravitational pressure weakens swiftly with growing distance among masses. The gravitational pressure is extraordinarily difficult to discover until as a minimum one of the gadgets has quite a few mass.

The gravitational pressure among gadgets is proportional to their hundreds and inversely proportional to the rectangular of the space among their centers.

To learn more about gravitational check the link below:

brainly.com/question/24783651

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1 year ago