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Lera25 [3.4K]
2 years ago
14

What are elements made of?

Chemistry
1 answer:
sveta [45]2 years ago
5 0

Answer:

atoms

Explanation:

every different element, or pure substance is made up of only one atom.

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If an isotope has an atomic number of 8 and a mass number of 18 how many neutrons
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It will be Oxygen . And total 8 protons, 8 electrons and 9 neutrons are present in it.
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17. Which of the following describes a condition in which an individual would not hear an echo?
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Answer:

No. 3 lithium

Explain that lithium has 3 protons and 3 electrons. There are 2 electrons on the first energy level and 1 electron on the second

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If the chemist mistakenly makes 250 mL of solution instead of the 200 mL, what molar concentration of sodium nitrate will the ch
Evgesh-ka [11]

Answer:

0.120M is the concentration of the solution

Explanation:

<em>Assuming the mass of sodium nitrate dissolved was 2.552g</em>

<em />

Molar concentration is an unit of concentration widely used in chemsitry defined as the moles of solute (In this case NaNO3) in 1L of solution.

To find this question we must find the moles of NaNO3 in 2.552g. With this mass and the volume (250mL = 0.250L) we can find molar concentration as follows:

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2.552g * (1mol / 84.99g) = 0.0300 moles NaNO3

<em>Molar concentration:</em>

0.0300 moles NaNO3 / 0.250L =

<h3>0.120M is the concentration of the solution</h3>
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True or false: All heterotrophs are omnivores.
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