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3 years ago

Which of the following statements is true?

Chemistry

2 answers:

mart [117]3 years ago

7 0

Answer: Option (d) is the correct answer.

Explanation:

Metals are the elements which have excess of electrons. Thus, in order to become stable, they readily lose electrons. Hence, they attain positive charge and become cation.

Whereas non-metals are the elements which have deficiency of electrons. Thus, in order to gain stability, they readily accept or share electrons. As a result, they attain negative charge and become anion.

Therefore, we can conclude that the statement, metals lose electrons to become cations is a true statement.

EastWind [94]3 years ago

6 0

Nonmetals are elements which have negative charge so naturally they have to gain electron to acquire this while metals are elements which have positive hence losing electrons to become cations. The correct answer is therefore:

<span>Metals lose electrons to become cations.</span>

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If 309 grams of potassium combines with 228 g chlorine gas, how many grams of the single product will be formed? What are the LR

lisov135 [29]

The amount of KCl that would be formed will be 478.8 grams

<h3>Stoichiometric calculations</h3>

From the equation of the reaction, the mole ratio of K to $Cl_2$ is 2:1.

Mole of 309 g potassium = 309/39 = 7.92 moles

Mole of 228 g Cl2 = 228/71 = 3.21 moles

Thus, potassium is in excess while Cl2 is limiting.

Mole ratio of Cl2 and KCl = 1:2

Equivalent mole of KCl = 3.21 x 2 = 6.42 moles

Mass of 6.42 moles KCl = 6.42 x 74.55 = 478.8 grams

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When an electron in an atom absorbed a photon, the energy of the electron changed by 2.94 x 10-19 J. What is the frequency of th

jok3333 [9.3K]

When an electron in an atom absorbed a photon, the energy of the electron changed by 2.94 × 10⁻¹⁹. The frequency of the photon is 4.4 × 10¹⁴ Hertz .

<h3>How to calculate the frequency of photon ?</h3>

To calculate the frequency of photon use the expression

E = hv

where,

E = Energy

h = Planck's Constant

v = frequency (Hz)

Put the value in above formula we get

E = hv

2.94 × 10⁻¹⁹ = 6.6 × 10⁻³⁴ × v

v = $\frac{2.94 \times 10^{-19}\ J}{6.6 \times 10^{-34}}$

= 0.44 × 10¹⁵

= 4.4 × 10¹⁴

Thus from the above conclusion we can say that When an electron in an atom absorbed a photon, the energy of the electron changed by 2.94 × 10⁻¹⁹. The frequency of the photon is 4.4 × 10¹⁴ Hertz .

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nikitadnepr [17]

Answer:

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Explanation:

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