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3 years ago

Which of the following correctly identifies the composition of an oxygen atom?

2 answers:

7 0

Oxygen has the atomic number 8, which eliminates options B and D right away. Any neutral atom, including the oxygen atom, has the same number of protons and electrons, meaning the number of electrons is also 8. If you're still not sold, the oxygen atom has a mass number of 16, which is the sum of the protons and neutrons in the atom, meaning there have to be 8 neutrons as well. The answer is option A.

aleksandrvk [35]3 years ago

3 0

The composition of an oxygen atom is: A) 8 protons, 8 electrons, and 8 neutrons.

<h3>Further Explanation</h3>

To determine how many of the subatomic particles are in the atom, the atomic number is used.

Atomic number is the number that gives the atom its identity and can be found in the periodic table. It gives the number of protons in an atom. It can be observed that the atomic number of the elements are increasing by one unit as you go from left to right.

<em>The atomic number of oxygen is 8, therefore, it has 8 protons.</em>

<em>In a neutral (uncharged atom), the number of protons and electrons are equal.</em>

<em>Hence, oxygen also has 8 electrons.</em>

In the most simple periodic table of elements, the atomic number is usually the smaller number written in the tile for each element. The larger number is the mass number.

The difference between the larger mass number and the smaller atomic number is the number of neutrons:

<em>Number of Neutrons = Mass Number - Atomic Number</em>

The mass number of oxygen is 16. We can use the atomic number and the mass number to get the number of neutrons using the equation above:

<em>Number of Neutrons = 16 – 8</em>

<em>Number of Neutrons = 8</em>

Therefore, it has been determined that the an oxygen atom has 8 protons, 8 electrons and 8 neutrons.

<h3>Learn More</h3>

Periodic Table brainly.com/question/2376134

Isotopes brainly.com/question/2757829

<h3>Keywords: protons, neutrons, electrons, mass number, atomic number</h3>

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3 years ago

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gulaghasi [49]

Answer:

an endothermic reaction

Explanation:

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4 years ago

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How many molecules of water can be produced from 46.72 liters of C8H18? 2\:C_8H_{18}\:+\:25\:O_2\:\:\Longrightarrow\:\:16\:CO_2\

Dmitry [639]

Answer:

1.13×10^25 molecules of water.

Explanation:

Equation of the reaction;

C8H18(g) + 25/2 O2 (g) -------> 8CO2(g) + 9H2O(l)

It is important to first put down the balanced reaction equation. It is not possible to solve any problem on stoichiometric relationship without a balanced reaction equation. Once the equation is obtained, we can now proceed with other steps in the solution of the problem.

From the reaction equation, 1 mole of C8H18 produces 9 moles of water

1 mole of C8H18 occupies 22.4L volume while 1 mole of water contains 6.02×10^23 molecules of water

Hence

22.4 L of C8H18 produces 9(6.02×10^23) molecules of water

46.72 L of C8H18 will produce 46.72 L × 9(6.02×10^23) molecules of water/22.4 L

= 113×10^23 or 1.13×10^25 molecules of water.

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3 years ago

What is the subject chemistry actually all about? Is it hard, and should I take regular or honors?

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3 years ago

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A 51.9g sample of iron, which has a specific heat capacity of 0.449·J·g?1°C?1, is put into a calorimeter (see sketch at right) t

Ghella [55]

Answer:

the initial temperature of the iron sample is Ti = 90,36 °C

Explanation:

Assuming the calorimeter has no heat loss to the surroundings:

Q w + Q iron = 0

Also when the T stops changing means an equilibrium has been reached and therefore, in that moment, the temperature of the water is the same that the iron ( final temperature of water= final temperature of iron = T )

Assuming Q= m*c*( T- Tir)

mc*cc*(T-Tc)+mir*cir*(T - Tir) = 0

Tir = 20.3 °C + 300 g * 4.186 J/g°C * (20.3 C - 19 °C) / ( 51.9 g * 0.449 J/g°C )

Tir = 90.36 °C

Note :

- The specific heat capacity of water is assumed 1 cal/g°C = 4.186 J/g°C

- We assume no reaction between iron and water

7 0

4 years ago