How could you distinguish between the gases h2 and no2?

Answer:

1. less reactive than sodium

Explanation:

The wavelength (in nanometers) of a photon emitted by a hydrogen atom when its electron drops from the n = 5 to n = 3 state is 1280nm.

The term wavelength defined as the distance between the two successive crests or troughs of the wave. Wavelength is denoted by the greek word lambda (λ).

The distance between the "crest"  of one wave to the crest of the another wave is the wavelength. We can measure from the "trough" of one wave to the trough of the another wave we get the same value for the wavelength.

The difference in energy (E) between two shells calculated as follows:

ΔE = -RH [(1 / nf2) - (1/ni2)] ΔE

= -2.18 x10-18 J [(1/32) - (1/52)] ΔE

= -1.55 x10-19 JE

hc/λλ = hc/Eλ

= [(6.63 x10-34 J.s.) x (3.00 x1017 nm/s)] /(1.55 x10-19 J)

λ = 1280nm

Thus, The wavelength of a photon emitted by a hydrogen atom when its electron drops from the n = 5 to n = 3 state is 1280nm.

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Aluminum sulfide is Al₂S₃, which shows that there are 3 sulfur atoms per formula unit.

In one mole there is Avogadro’s number of atoms and Avogadro’s number = 6.02 x 10²³

In 1.10 mole = 1.10 x 6.02x10²³ = 6.62 x 10²³ formula units

Now multiply with 3 to get number of sulfur atoms present in 1.10 mol of Aluminum sulfide;

3 x 6.62x10²³ = 1.99 x 10²⁴

So, the answer is 1.99 x 10²⁴ sulfur atoms.

The electrons in the higher energy level of an atom which determines the chemical properties of the atom and involved in chemical bonding are called the valence electrons.

An atom is composed of electrons, protons and neutrons. Protons and neutrons are located inside inside the core of atom called nucleus. Electrons are revolving around around the nucleus through circular paths of definite energy.

The regions where the electrons can be seen is called orbital. The electrons in the orbitals closer to the nucleus is called the core or inner electrons. The electrons which are in the outer shells away from the nucleus is called valence electrons.

Valence electrons are free to interact with the surrounding environment and they are participating in chemical bonding to form compounds. When the valence shells attain octet, they are said to be stable. Therefore, the atoms with electron deficient or extra electrons in the valence shell bonds with other atoms.

Therefore, the number of valence electrons determines the chemical properties of the atom.

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The number of moles of C9H8O4 in a 0.300g aspirin tablet can be found by using the formula: moles = mass/molar mass. The molecular mass of aspirin (C9H8O4) is 180.15 amu. Therefore, the calculation yields approximately 0.0017 mole of aspirin in the tablet.

To determine the number of moles of C9H8O4 in a 0.300g tablet of aspirin, you must apply the concept of molar mass in reverse. The average molecular mass of an aspirin molecule, C9H8O4, is the sum of the atomic masses of nine carbon atoms, eight hydrogen atoms, and four oxygen atoms, which amounts to 180.15 amu.

One mole of any substance contains 6.02 x 10^23 molecules or formula units. This amount is known as Avogadro's number. Therefore, the molar mass of a substance in grams per mole is numerically equal to the substance’s molecular weight in atomic mass units.

So, to find the number of moles in 0.300g of aspirin, you would use the formula: moles = mass/molar mass. Thus, moles of aspirin = 0.300 g / 180.15 g/mole ≈ 0.0017 mole.

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Isotopes of a particular element are alike in that they all have the same atomic number which means they have the same number of protons. However, they differ in the number of neutrons.

The isotopes of a particular element are alike in that they all have the same number of protons in the nucleus, hence, they are all part of the same atomic family and share the same atomic number. This determines the element's position in the periodic table and its chemical properties. For example, all isotopes of Hydrogen - Protium, Deuterium and Tritium - have one proton each.

However, isotopes of a same element differ in their number of neutrons. For instance, while Protium has no neutrons, Deuterium has one and Tritium has two.

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The molecular formula C2H10N2 tells us that there are 2 Carbon atoms, 10 Hydrogen atoms, and 2 Nitrogen atoms in the molecules, while the empirical formula CH5N tells us that for every Carbon atom, there are 5 Hydrogen atoms and 1 Nitrogen atom. In essence, the molecular formula is a multiple of the empirical formula.

The empirical formula represents the simplest whole-number ratio of elements in a compound. The molecular formula is derived from the empirical formula and represents the actual count of these elements in a molecule. If we take a look at the formula C2H10N2, it can be simplified to CH5N which becomes the empirical formula. The molecular formula C2H10N2 tells us that in the molecule, there are 2 Carbon atoms, 10 Hydrogen atoms, and 2 Nitrogen atoms and the empirical formula CH5N indicates that for every Carbon atom, there are 5 Hydrogen atoms and 1 Nitrogen atom in the simplest whole number ratio.

From the example given, we can see that the molecular formula is a multiple of the empirical formula. It is derived from the empirical formula by multiplying the subscripts in the empirical formula by the same integer.

So, to summarize, both the empirical and molecular formulas provide important information about a compound; the molecular formula shows the actual number of elements in a compound and the empirical formula shows the simplest whole number ratio of these elements.

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Copper has an atomic number of 29, 4 copper atoms contain 116 electrons, while 3 copper atoms can be formed from 87 protons.

The atomic number of an element tells us the number of protons in an atom of that element.

1. Since copper has an atomic number of 29, each copper atom has 29 electrons as well. To find the total number of electrons in 4 atoms of copper, we can simply multiply the number of electrons in one copper atom by 4.

So, there are 4 [tex]\times[/tex] 29 = 116 electrons in 4 atoms of copper.

2. Since each copper atom has 29 protons, we can divide the total number of protons by 29 to find the number of copper atoms that can be made.

[tex]\dfrac{87}{29} = 3[/tex]

So,87 protons can make 3 copper atoms.

Therefore, there are 116 electrons in 4 atoms of copper and 3 copper atoms can be made out of 87 protons, respectively.

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The average atomic mass of an element on the periodic table is a weighted average and not a whole number because it accounts for the different masses and abundances of each isotope, whereas the actual mass of an individual atom is approximately its mass number, a whole number.

You will never find an atom that has an actual atomic mass equal to the average atomic mass of the element because the atomic mass listed on the periodic table is a weighted average of all the naturally occurring isotopes of that element. Because each proton and each neutron has a mass of approximately one atomic mass unit (amu), and electrons contribute much less, the atomic mass of each isotope is approximately equal to its mass number, which is always a whole number. However, the average atomic mass is not a whole number because it is a calculation that includes the different masses of each isotope and their respective abundance percentages. This weighted average reflects the average mass of an atom if you could randomly pick one out of a sample containing all the isotopes of that element.

For example, carbon has two stable isotopes, 12C and 13C, with respective abundances of 98.89% and 1.11%. The average atomic mass of carbon is calculated by taking into account these abundances, leading to an average atomic mass that does not match exactly the mass of either isotope. In contrast, some elements have atomic masses in square brackets, like technetium (element 43) and promethium (element 61), which indicate the mass number of their most stable isotope because these elements do not have stable isotopes with an average atomic mass.

The student's question involves predicting the formulas of new combinations of elements to form binary ionic compounds. The correct formulas are based on the charges of the ions, aiming for a neutral overall charge. Examples include KCl for potassium + chlorine, AlF3 for aluminum + fluorine, and SnO2 for tin + oxygen.

The student is asking for the predicted formulas of new chemical combinations by replacing elements in known compounds utilizing the rules for writing formulas of binary ionic compounds. The key to solving this problem is to balance the charges of the ions so that the overall charge of the compound is neutral. When predicting the formulas, we need to consider the valency or oxidation states of the elements involved. For example, if potassium (K) replaces sodium (Na) in sodium chloride (NaCl), since both have a +1 charge, the new formula would be KCl. Following a similar process, substituting aluminum (Al) for aluminum in aluminum fluoride (AlCl3) with fluorine (F), considering aluminum has a +3 charge and fluorine has a -1 charge, results in the formula AlF3. The charge of tin (Sn) is +2 or +4, but when combined with oxygen (O), which has a -2 charge, a likely compound could be SnO2, assuming tin is in the +4 oxidation state.

Let's predict the remaining chemical formulas based on the initial list:

Answer:

The theoretical yield is calculated from the amount of the limiting reactant present.

Explanation:

The limiting reactant is one which is present in lesser amount than the other reactant (based on molar ratio requirement)

For example in formation of water we need one mole of hydrogen gas and half moles of oxygen gas. Now we have one mole of hydrogen gas and one mole of oxygen gas then the limiting reagent is hydrogen gas.

theoretical yield is the expected yield of a reaction calculated based on the moles or amount of limiting reagent present as the limiting reagent is going to be completely consumed during the reaction.

Answer : The correct option is, (D) The theoretical yield is calculated from the amount of the limiting reactant present.

Explanation :

Excess reagent : It is defined as the reactants not completely used up in the reaction.

Limiting reagent : It is defined as the reactants completely used up in the reaction.

Theoretical yield : It is calculated from the amount of the limiting reagent present in the reaction.

Actual yield : It is experimentally determined.

Hence, the correct option is, (D) The theoretical yield is calculated from the amount of the limiting reactant present.

Answer : The correct option is, [tex]1.63\times 10^{-3}g[/tex]

Explanation : Given,

Mass of oxygen gas = [tex]1.45\times 10^{-3}g[/tex]

Molar mass of oxygen gas = 32 g/mole

Molar mass of water = 18.02 g/mole

First we have to calculate the moles of [tex]O_2[/tex].

[tex]\text{Moles of }O_2=\frac{\text{Mass of }O_2}{\text{Molar mass of }O_2}=\frac{1.45\times 10^{-3}g}{32g/mole}=4.53\times 10^{-5}moles[/tex]

Now we have to calculate the moles of [tex]H_2O[/tex].

The balanced chemical reaction is,

[tex]2H_2+O_2\rightarrow 2H_2O[/tex]

From the balanced reaction we conclude that

As, 1 mole of [tex]O_2[/tex] react to give 2 mole of [tex]H_2O[/tex]

So, [tex]4.53\times 10^{-5}[/tex]moles of [tex]O_2[/tex] react to give [tex]4.53\times 10^{-5}\times 2=9.06\times 10^{-5}[/tex] moles of [tex]H_2O[/tex]

Now we have to calculate the mass of [tex]H_2O[/tex]

[tex]\text{Mass of }H_2O=\text{Moles of }H_2O\times \text{Molar mass of }H_2O[/tex]

[tex]\text{Mass of }H_2O=(9.06\times 10^{-5}mole)\times (18.02g/mole)=1.63\times 10^{-3}g[/tex]

Therefore, the mass water produced is, [tex]1.63\times 10^{-3}g[/tex]

The particle that an atom can lose or gain in order to form a charged ion is electron.

When an atom lose an electron from their valence shell the it form positive charged ion known as cation.

When an atom gain an electron from their valence shell then it form negative charged ion known as anion.

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Uv gel enhancements rely on ingredients from the monomer liquid and acrylic chemical family.