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2 years ago

The bright-line emission spectrum of an element can best be explained by.

1 answer:

7 0

The light emitted by an element when its electrons return to a lower energy state can be viewed as a bright line emission spectrum.

<h3>What is Emission spectrum ?</h3>

The distribution of electromagnetic radiation released by a substance whose atoms have been excited by heat or radiation.

A spectroscope can be used to determine which frequencies have been emitted by a substance.

An emission line will appear in a spectrum if the source emits specific wavelengths of radiation.

This emission occurs when an atom, element or molecule in an excited state returns to a configuration of lower energy.

Learn more about emission spectrum here ;

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What is the mass in grams of a single formula unit of silver chloride, AgCI? A) 4.21 x 1021 g B) 8.61 x 10258 C) 1.66 x 10-248 D

bekas [8.4K]

Answer: D) $2.38*10^-^2^2$ g

Explanation: The question asks to convert formula unit to grams. It is a unit conversion problem.

1 mole equals to Avogadro number of formula units. So, to convert the given number of formula units to moles, we need to divide by the Avogadro number. After this, we do moles to grams conversion and for this the moles are multiplied by the molar mass of the compound. Molar mass of AgCl is 143.32 gram per mol.

$1FormulaUnitAgCl(\frac{1mol}{6.022*10^2^3formulaUnits})(\frac{143.32g}{1mol})$

= $2.38*10^-^2^2$ g

So, the correct option is D) $2.38*10^-^2^2$ g

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3 years ago

Read 2 more answers

Which statement is true about tomato juice?

sveta [45]

Answer:

The correct answer is Option A. Explanation: Tomato is a citrus fruit which contains citric acid as a main chemical component. This range lies in the range of acidic substances.

8 0

3 years ago

4Fe + 3O2 → 2Fe2O3

dsp73

The correct answer is A.

5 0

2 years ago

Make a plan to partition the mixture of iron chips, water and alcohol.

DanielleElmas [232]

Answer:

water into drop alcohol

Explanation:

alcohol first burn

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3 years ago

Although not usually soluble in plain water, an amphoteric oxide or hydroxide is: 1. soluble in neutral solutions. 2. soluble in

Aleksandr [31]

Answer:

The correct option is: 4. soluble in both acidic and basic solutions

Explanation:

Oxide is a chemical compound formed by an element with oxygen. In such compounds, the oxygen is generally present in the -2 oxidation state.

Whereas, hydroxide is a chemical compound formed by an element with hydroxyl group (-OH).

Oxides and hydroxides of some elements are amphoteric in nature. Such compounds can behave as an acid in basic medium and behave as a base in acidic medium.

Therefore, amphoteric oxides and hydroxides are soluble in both acidic and basic solutions.

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4 years ago