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Tema [17]
3 years ago
5

Which element has 21 neutrons and 20 electrons?

Chemistry
2 answers:
mario62 [17]3 years ago
6 0
Scandium has 21 neutrons
LuckyWell [14K]3 years ago
4 0

Answer:

Calcium is your answer

Have a good day ahead

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What did the photoelectric experiment demonstrate?
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Explanation:

When an electromagnetic wave like light hits a material, the electrons gets emitted. The emission of electrons is called photoelectric effect. The emitted electrons are called photoelectrons. In this process the transfer of energy takes place from light to an electron.

Hence, the correct option regarding the photoelectric experiment is (A) " Light can cause electrons to be released from the surface of a  metal."

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4 years ago
Consider the following equilibrium: 2SO2(g) + O2(g) 2SO3(g) Which of the following is a correct equilibrium expression?
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The correct equilibrium expression would be one that has products over reactants, and to the power of their stoichiometric coefficient. Also, it would not include any liquids or solids.

The equilibrium expression for your balanced reaction is:
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3 years ago
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Tresset [83]

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4 0
4 years ago
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LenaWriter [7]

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5 0
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Read 2 more answers
Make a general statement of how substances in a mixture can be separated
user100 [1]

Answer

Depends on type of mixture. But I think separating the different sized particles through filtration would be a sufficient answer for middle school level unless they have taught you about other mixtures.

Explanation:

Hey,

There are thousands of way to separate mixtures. Each way is specific to the type of mixture. If the mixture is homogeneous processes like distillation can be employed. For heterogeneous mixture filtration can be used to separate particles of different sizes.

7 0
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