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melisa1 [442]
3 years ago
11

Help me please fast​

Chemistry
1 answer:
Rufina [12.5K]3 years ago
3 0

Answer:

He

Be

Ar are the noble gases

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Uranium, an important component of both nuclear weapons and nuclearreactors, has two major isotopes, U-238, which has a half-lif
elixir [45]

Answer:

Hello your question is poorly written below is the well written question

Uranium, an important component of both nuclear weapons and nuclear reactors, has two major isotopes, U-238, which has a half-life of  approximately 4.5 billion years, and U-235, which has a half-life of approximately 700 million years. Both were present in equal amounts at the time of the creation of the Earth, 4.5  billion years ago. How many years after the creation of the Earth had the amount of radiation from uranium decayed to half the amount present at the time of the creation of the Earth

Answer : 140 billion years

Explanation:

Given that :

U-238   h1/2 = 4.5 billion years

U-235   h1/2 = 700 million years

At the beginning both Isotopes where present in equal amount

Determine the T years before the amount of Uranium decays to Half

T =   ?    N'2 = N1 / 2

we know that N = No ( 1/2 )^h   where h = time / half-life time

attached below is the detailed solution of the given problem

6 0
2 years ago
Identify which reaction is NOT a chemical reaction.<br> es )
vova2212 [387]

Answer:

You never listed the options

Explanation:

A chemical reaction is a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.

4 0
3 years ago
Why can liquids change shape but solids cannot
Cerrena [4.2K]

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Explanation:

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Which substance could any excess not be removed by filtration​
horrorfan [7]

Answer:

sodium hydroxide

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i think sodium hydroxide

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Which statement(s) is/are TRUE about covalent bonds?
tresset_1 [31]

Answer:

1. Covalent bonds can form between two nonmetal atoms.

2. Covalent bonds can form between atoms of the same element.

3. Covalent bonds can form between atoms of different elements.

Explanation:

I hope this helps u! :D



Explanation:

3 0
3 years ago
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