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nasty-shy [4]
3 years ago
13

which of the following correctly identifies the composition of an oxygen atom? A.8 protons, 8 electrons, and 8 neutrons. B.6 pro

tons, 6 electrons, 6 neutrons. C.8 protons, 6 electrons, 7 neutrons. D. 6 protons, 6 electrons and 12 neutrons
Chemistry
2 answers:
Ulleksa [173]3 years ago
8 0
<span>You can answer this question by getting the atomic number and atomic mass of Oxygen from a periodic table. There you will find that the atomic number is 8, that means, by definition, that it has 8 protons. This is, because atomic number is defined as the number of protons of an element. Given that the atom is neutral, that implies that the atoms have the same number of electrons than protons. So you already know that the oxygen atoms has 8 protons and 8 electrons. The number of neutrons can vary, which is what defines the isotopes. Given that the atomic mass of oxygen is 15.999, that means that most atoms of oxygen has 8 neutrons (8 protons +8 neutrons = 16 atomic mass). But you can not be sure that a specific atom of oxygen has 8 neutrons, nevertheless, given that the other options are discarded (because they do not have 8 protons and 8 electrons), the only correct answer is the option A. 8 protons, 8 electrons, and 8 neutrons.</span>
tigry1 [53]3 years ago
6 0

The composition of an oxygen atom is A. 8 protons, 8 electrons, and 8 neutrons. This can be determined by using information from the Periodic Table: atomic number and the mass number. The atomic number gives the number of protons. This is also equal to the number of electrons. The difference of the mass number and the atomic number gives the number of neutrons.

<h3>FURTHER EXPLANATION</h3><h3>Subatomic Particles in an Atom</h3>
  • Atoms are made up of subatomic particles: protons, neutrons, and electrons.
  • Protons and neutrons are found in the nucleus or center of the atom. Protons are positively charged and neutrons are uncharged.
  • Electrons are found in electron orbitals around the nucleus.
<h3>Periodic Table of Elements</h3>
  • The number of protons, neutrons, and electrons an element has can be determined from the atomic number and the mass number of the element. These are information that can be found in the Periodic Table.
  • In the simplest Periodic Tables, two numbers are found in the square for each element: the atomic number which is the smaller number and the atomic mass which is either given as a whole number or as a decimal.  
  • The atomic number tells the number of protons the element has. It gives the atom its identity.
  • In a neutral atom, the number of protons is equal to the number of electrons. Therefore, the atomic number also gives the number of electrons.
  • The atomic mass is the weighted average of the masses of the different forms of the element (or "isotope"). They usually are expressed in decimals. When this value is rounded off to a whole number, it can be indication of the total number of protons and neutrons in the atom. This is because the protons and the neutrons are the heavier subatomic particles and give the atom its mass. Hence, it is also called the mass number.
  • The mass number is the sum of the protons and the neutrons found in the nucleus of an atom.
<h3>Composition of an oxygen atom</h3>

Atomic Number = 8

Mass number = 16

  • number  of protons = atomic number = 8
  • number of electrons = atomic number = 8
  • number of neutrons = (mass number - atomic number)

                                           = 16 - 8

                                           = 8

<h3>LEARN MORE</h3>
  • isotopes brainly.com/question/5357969
  • isotopic notation brainly.com/question/419606
  • atomic mass brainly.com/question/1698344

<em>Keywords: protons, electrons, neutrons, atomic number, mass number</em>

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Write the chemical equation for the reaction of lithium hydroxide (LiOH) with an Arrhenius acid of your choosing. Name and write
Inessa05 [86]
<h3>Answer:</h3>

LiOH(aq) +HCl(aq)→ LiCl(aq) + H₂O(l)

Salt formed is LiCl

<h3>Explanation:</h3>
  • Arrhenius acid refers to a substance that ionizes in water to generate protons or hydrogen ions.
  • Examples of Arrhenius acid include acids such as HCl, H₂SO₄ and HNO₃.
  • A reaction between Lithium hydroxide and an Arrhenius acid such as HCl will yield a salt and water.

That is;

LiOH(aq) +HCl(aq)→ LiCl(aq) + H₂O(l)

  • The salt formed is LiCl
  • The reaction is an example of neutralization reaction.
5 0
3 years ago
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Explanation:

6 0
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What is the nucleus of an atom?
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5 0
2 years ago
0.53g of acetanilide was subjected to kjeldahl determination and the ammonia produced was collected in 50cm3 of 0.50M of h2so4.o
Lady bird [3.3K]

Answer:

10.57% of N in acetanilide

Explanation:

All nitrogen in the sample is converted in NH₃ in the Kjeldahl determination. The NH₃ reacts with H₂SO₄ as follows:

2NH₃ + H₂SO₄ → 2NH₄⁺ + SO₄²⁻

The acid in excess in titrated with Na₂CO₃ as follows:

Na₂CO₃ + H₂SO₄ → Na₂SO₄ + H₂O + CO₂

To solve this question we must find the moles of sodium carbonate = Moles of H₂SO₄ in excess. The added moles - Moles in excess = Moles of sulfuric acid that reacts:

<em>Moles Na₂CO₃ anf Moles H₂SO₄ in excess:</em>

0.025L * (0.05mol / L) = 1.25x10⁻³ moles Na₂CO₃ / 0.01360L =

0.09191M * 0.250L = 0.0230 moles H₂SO₄ in excess.

<em>Moles H₂SO₄ added:</em>

0.050L * (0.50mol / L) = 0.0250 moles H₂SO₄ added

<em>Moles that react:</em>

0.0250 moles - 0.0230 moles = 0.0020 moles H₂SO₄

<em>Moles of NH₃ = Moles N:</em>

0.0020 moles H₂SO₄ * (2mol NH₃ / 1mol H₂SO₄) = 0.0040 moles NH₃ = Moles N

<em>mass N and mass percent:</em>

0.0040 moles N * (14g / mol) = 0.056gN / 0.53g * 100 =

<h3>10.57% of N in acetanilide</h3>
7 0
2 years ago
3 points
VLD [36.1K]

Answer:

<h3>The answer is 8.29 %</h3>

Explanation:

The percentage error of a certain measurement can be found by using the formula

P(\%) =  \frac{error}{actual \:  \: number}  \times 100\% \\

From the question

actual density = 19.30g/L

error = 20.9 - 19.3 = 1.6

We have

p(\%) =  \frac{1.6}{19.3}  \times 100 \\  = 8.290155440...

We have the final answer as

<h3>8.29 %</h3>

Hope this helps you

5 0
3 years ago
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