The initial and final states if an electron in hydrogen emits a photon with a wavelength of 656 nm is n = 3 to n = 2.
given that :
wavelength of the photon emitted λ = 656 nm = 656 × 10⁻⁹ m
the energy of the photon is given as :
E = hc / λ
= (6.626 × 10⁻³⁴ × 3 ×10⁸ ) / 656 × 10⁻⁹
= 3 × 10⁻¹⁹ J = 1.9 eV
En = - 13.6 / n² eV
where n = 1,2,3 ....
1) n = 2 to n = 1
E2 - E1 = - 13.6 eV ( 1 / 4 - 1/ 1)
= 10.2 eV
2) n = 3 to n = 2
E3 - E2 = -13.6 eV ( 1/3² - 1/ 2² )
= 1.9 eV
Thus the initial and the final states are n = 3 to n = 2.
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write a paragraph using the words atom, element, compound, and mixture.
this is the chemical formula for talc (the main ingredient in talcum powder): an analytical chemist has determined by measurements that there are moles of magnesium in a sample of talc. how many moles of oxygen are in the sample? be sure your answer has the correct number of significant digits.
Mg3 (Si,03),(OH), is the chemical formula for talc: an analytical chemist has determined by measurements that there are 90.4 moles of magnesium and 2.43 moles of oxygen in a sample of talc.
Talcum powder is formed from talc. Talc is a mineral created up primarily of metallic element, silicon, and oxygen. As a powder, it absorbs wet well and helps weigh down on friction, creating it helpful for keeping skin dry and serving to forestall rashes.This mineral is employed as a thickening agent and stuff. It's an ingredient in ceramics, paints, and building material.
Talc is a hydrous magnesium sheet salt with the statement Mg3Si4O10(OH)2. The elementary sheet consists of a layer of magnesium-oxygen/hydroxyl octahedra, sandwiched between 2 layers of siliconoxygen tetrahedra.
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what special equipment did niels bohr use to develop his atomic model?
Neil Bohr used the fluorescent screen and an alpha particle detector to study the structure of an atom.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
The atom as a whole is neutral and stable due to presence of oppositely charged particles.
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Which of the following is an example of a heterogeneous mixture?
salad
milk
paint
toothpaste
Answer:
salad
Explanation:
a housewife used the aluminum can to keep vinegar. After sometime, it is found that the vinegar is spoiled. Give a reason.
Answer:
Explanation:She was wrong
what quantity is needed to convert between the moles of a given sample of a substance and its mass in grams
The molar mass of the substance is needed to convert between the moles of a given sample of a substance and its mass in grams.
What is molar mass?A compound's molar mass, which is measured in grams per mole, specifies how much of a given material weighs in one mole. In other terms, the molar mass is the sum of the masses of all the atoms that make up a mole of a certain molecule, expressed in grams. As a result, the molar mass is measured in grams/mole.
The compound's molar mass is expressed in grams per mole, or g/mol. The mass of 1 mol, expressed in the SI as g/mol, is the definition of the molar mass. Example: Water has a molar mass of 18.016 g/mol.
Thus, The molar mass of the substance is needed to convert between the moles of a given sample of a substance and its mass in grams.
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The complete question is as follows:
What quantity is needed to convert between the moles of a given sample of a substance and its mass in grams?
a the molar mass of the substance
b the density of the substance
с the physical state of the substance
d all of the above
How many moles exist in 3,000,000 particles of gold (Au)?
Answer:
4.98 x 10^-18 mole
Explanation:
1 mole has 6.022 x 10^23 particles
so 3,000,000/(6.022 x 10^23) = 4.98 x 10^-18 mole
please help!
Are magnesium and calcium more reactive with oxygen in the air than is aluminum? Support your answer.
Magnesium and calcium are 2nd group elements with 2 valence electrons. They are metals in room temperature and easily lose these electrons to nonmetals such as oxygen.
What is magnesium ?Magnesium is 12th element in periodic table. It is 2nd group element and is a called alkaline earth metals. Its group members are calcium, strontium, and barium.
They contains 2 valence electrons which can be easily lost to a non-metal. Oxygen is highly electronegative element and it contains 6 valence electrons and need two more electrons to achieve octet.
Al is 13th group element it is not as much electropositive as alkaline earth metals. It contains 3 valence electrons and thus it need to lose all these 3 electrons to achieve octet. Hence, Al is less reactive towards O2 in comparison with Mg and Ca.
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A science class is going to do an experiment to investigate how water temperature changes the rate at which salt dissolves in water. What tool will be needed to measure the temperature of the water?
Answer:
thermometers
Explanation:
Answer: thermometer
Explanation: trust me ;)
What makes a field forever unique?
From cotton fields to corn stalks, if this is what you mean, a forever field is unique in its own way by keeping all types of plants in the field. They are all different in how they grow and what they do.
which set of elements is arranged in order of increasing electronegativity? which set of elements is arranged in order of increasing electronegativity? ga < ge < p < n p < n < ge < ga ge < n < ga < p n < p < ge < ga
The electronegativity is n < p < ge < ga.
What is electronegativity?Electronegativity is a measure of an atom's ability to attract electrons when it forms a chemical bond with another atom. It is based on the Pauling Scale, which assigns values to elements based on their tendency to attract electrons when they form bonds. Electronegativity increases from left to right across the periodic table, and increases from the bottom to the top of the periodic table.
The correct answer is n < p < ge < ga. This is because electronegativity increases as we move down a group in the periodic table and from left to right across a period.
Therefore, the element with the highest electronegativity is at the bottom right corner of the periodic table, which is gaseous, followed by Germanium, Phosphorus, and then Nitrogen.
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