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2 years ago

Which of the following best explains the trend in ionization energy across a period?

Chemistry

2 answers:

Alina [70]2 years ago

4 0

A) It decreases because the distance between the nucleus and outermost shell increases

Alenkinab [10]2 years ago

4 0

Answer: It increases because the outermost electrons are attracted more strongly by protons.

Explanation:

Ionization energy is the energy required to remove the most loosely bound electron from a gaseous atom. Metals have low ionization energy as they tend to attain stable configuration by losing the valence electrons.

The size of an atom decreases as we move across the period because the electrons get added to the same shell and the nuclear charge keeps on increasing. Thus the electrons get more tightly held by the nucleus.

As, the size of an element decreases, the valence electrons come near to the nucleus. So, the attraction between the nucleus and the shared pair of electrons increases and thus ionization energy increases.

Hence, the correct statement is It increases because the outermost electrons are attracted more strongly by protons.

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weqwewe [10]

Answer:

the correct answer is c, how easily something catches flames

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3 years ago

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Natali5045456 [20]

Answer:

The molality ( m ) of a solution is the moles of solute divided by the kilograms of solvent. A solution that contains 1.0 mol of NaCl dissolved into 1.0 kg of water is a “one-molal” solution of sodium chloride. The symbol for molality is a lower-case m written in italics.

In order to calculate the molality of a solution divide the moles of solute by the volume of the solution expressed in liters.

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7 0

2 years ago

A 1.775g sample mixture of potassium hydrogen carbonate is decomposed by heating. if the mass loss is 0.275g what is the percent

Marina86 [1]

A 1.775g sample mixture of KHCO₃ is decomposed by heating. if the mass loss is 0.275g, the mass percentage of KHCO₃ is 70.4%.

<h3>What is a decomposition reaction?</h3>

A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.

Step 1: Write the balanced equation for the decomposition of KHCO₃.

2 KHCO₃(s) → K₂CO₃(s) + CO₂(g) + H₂O(l)

The mass loss of 0.275 g is due to the gaseous CO₂ that escapes the sample.

Step 2: Calculate the mass of KHCO₃ that formed 0.275 g of CO₂.

In the balanced equation, the mass ratio of KHCO₃ to CO₂ is 200.24:44.01.

0.275 g CO₂ × 200.24 g KHCO₃/44.01 g CO₂ = 1.25 g KHCO₃

Step 3: Calculate the mass percentage of KHCO₃ in the sample.

There are 1.25 g of KHCO₃ in the 1.775 g sample.

%KHCO₃ = 1.25 g/1.775 g × 100% = 70.4%

A 1.775g sample mixture of KHCO₃ is decomposed by heating. if the mass loss is 0.275g, the mass percentage of KHCO₃ is 70.4%.

Learn more about decomposition reactions here: brainly.com/question/14219426

7 0

2 years ago

How many moles of copper Il sulfide can be produced from 2.8 moles of sulfur? Cu + S --> CuS

Kamila [148]

Answer: 2.8 moles of copper (Il) sulfide $(CuS)$ will be produced from 2.8 moles of sulphur.

Explanation:

The balanced chemical reaction is:

$Cu+S\rightarrow CuS$

According to stoichiometry :

1 mole of $S$ produce = 1 mole of copper (Il) sulfide $(CuS)$

Thus 2.8 moles of $S$ will produce= $\frac{1}{1}\times 2.8=2.8moles$ of copper (Il) sulfide $(CuS)$

Thus 2.8 moles of copper (Il) sulfide $(CuS)$ will be produced from 2.8 moles of sulphur.

5 0

3 years ago

Atom A and Atom B have the same number of protons and neutrons, but they do not have the same nun ber of

Bogdan [553]

Answer:

The atoms have the same chemical symbol.

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3 years ago