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Oksana_A [137]
3 years ago
9

The image shows the representation of an unknown element in the periodic table. A square is shown. Inside the square twelve is w

ritten at the top righthand side. To the middle left side, Symbol is written. Below it Name is written. And further below near the bottom edge of the square, twenty-four point three zero five is written. Based on the representation, which of the following statements about the element is true? The number of neutrons in an atom of the element is 24. The combined mass of all the protons and electrons is 24.305. The combined mass of all the neutrons and electrons is 24.305. The mass number of the most common isotope of the element is 24.
Chemistry
1 answer:
avanturin [10]3 years ago
7 0

Answer:

The combined mass of all the protons and electrons is 24.305.

Explanation:

From the information given about the atom, we can see that the relative atom mass of the element is 24.305.

The relative atomic mass of an atom is the combined mass of all its isotope in proportion of their geonormal abundances. On the periodic table, this mass deals with the amount of protons and neutrons present in a given atom.

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Fittoniya [83]
18. <span>Answer is </span>A

<span>  
<span>Since the enthalpy of reaction is positive, the forward reaction is<span> an endothermic reaction which means the energy is gained from the surrounding to happen the reaction. If the temperature decreases, according to the </span></span>Le Chatelier's principle, the system tries to become equilibrium by increasing temperature. Since forward reaction is endothermic (because of the bond breaking), the backward reaction is exothermic (because of the bond making) which releases the energy to the surroundings. This makes the increase of temperature. So if the backward reaction is promoted because of the decrease of temperature, then the concentration of H</span><span>₂ will decrease.</span>

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</span>

19. Answer is A.

The reactant side has 2 moles/molecules of reactants and the product side has 4 moles/molecules of products which come from 1 N₂(g) and 3 H₂<span>(g). If the pressure is reduced in the system, according to the Le Chatelier's principle, the system tries to increase the pressure. </span><span>Hence, forward reaction is promoted because of the higher number of molecules in product side. If the forward reaction is promoted, the concentration of NH</span>₃(g) will decreased.


<span>20. </span>Answer is C.

If the concentration of reactant is increased in the system, according to the Le Chatelier's principle, the system tries to reduce the concentration of that reactant. So if NH₃(g) concentration is increased, then to be equilibrium, the forward reaction will be promoted. Then the concentration of N₂<span>(g) will increase.</span>

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4 0
2 years ago
In the diagram of a transverse wave shown, what does P represent?
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L is amplitude M is wavelength and P is frequency
8 0
2 years ago
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sergey [27]

Answer:

The scientific method is an empirical method of acquiring knowledge that has characterized the development of science since at least the 17th century.

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7 0
3 years ago
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nordsb [41]
Answer is 3
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3 years ago
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Gelneren [198K]

Answer:

Explanation:

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= mole of oil = mass of oil / molecular weight of oil

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3 years ago
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