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3 years ago

2. A(n)

Chemistry

2 answers:

Korolek [52]3 years ago

8 0

Answer:

Compound is made of two or more than two elements in a fix ratio by mass. Compounds have different properties from the parent elements.

Explanation:

The chemical and physical properties of compound are different from the parent materials because it is produced from the chemical combination of elements. In chemical combination, bonds are formed and new substance is produced which is quite different from the parent substances. For example, CO2 is produced when carbon and oxygen react with each other. The properties of CO2 are different from carbon and oxygen.

DIA [1.3K]3 years ago

4 0

Answer: A compound

Explanation: A compound is a substance which contains two or elements chemically combined together.

The properties of a compound are different from the properties of the individual elements. For example, water H2O which is made up of hydrogen and oxygen atoms has properties different from the individual properties of hydrogen and oxygen.

Also, water is a compound made up of hydrogen and oxygen atoms which are combined in the ratio is 2 hydrogen atoms to 1 oxygen atom.

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A hydrogen-like ion is an ion containing only one electron. The energies of the electron in a hydrogen-like ion are given by the

yan [13]

Answer:

The ionization energy (in kJ/mol) of the helium ion is 21,004.73 kJ/mol .

Explanation:

$E_n = -(2.18 10-18 J)\times \frac{Z^2}{n^2}$

Z = atomic mass

n = principal quantum number

Energy of the electron in n=1,

$E_1= -(2.18 10^{-18} J)\times \frac{4^2}{1^2}=-3.488\times 10^{-17} J$

Energy of the electron in n = ∞

$E_{\infty}= -(2.18 10^{-18} J)\times \frac{2^2}{\infty ^2}=0 J$

Ionization energy of the $He^+$ ion:

$I.E=E_{infty}-E_1=0-(-3.488\times 10^{-17} J)=3.488\times 10^{-17} J$

$I.E=3.488\times 10^{-20} kJ$

To convert in into kj/mol multiply it with $N_A=6.022\times 10^{23} mol^{-1}$

$I.E=3.488\times 10^{-20} kJ\times 6.022\times 10^{23} mol^{-1}=21,004.73kJ/mol$

3 0

3 years ago

Read 2 more answers

Which statement describes a cycle of Earth's surface?

lord [1]

The answer is .......

<span>A.Nitrogen from the atmosphere is used and replaced directly by plants on the surface.
</span>
hope it helps yall!

have a great one! :)

5 0

3 years ago

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As we move across the periodic table of elements, certain trends are evident. The placement of individual elements in the period

Soloha48 [4]

Answer:

A and E

Explanation:

A and E are the answers! usa test prep told me. :L

4 0

2 years ago

Explain three factors that can affect the size of a line in a spectrum.

Sunny_sXe [5.5K]

Answer:For atoms and molecules, the width of spectral lines is governed mainly by the broadening of the energy levels of the atoms or molecules during interactions with surrounding particles and by the broadening of the spectral lines as a result of the Doppler effect.

Explanation:

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3 years ago

Many chemical names are similar at ﬁrst glance. Give the formulas of the species in each set: (a) ammonium ion and ammonia; (b)

ohaa [14]

Answer:

a) Ammonium ion: NH₄⁺, ammonia: NH₃.

b)Magnesium sulfide: MgS, magnesium sulfite: MgSO₃, magnesium sulfate: MgSO₄.

c) Chloric acid: HClO₃, chlorous acid HClO₂.

d) Cupric bromide: CuBr₂, cuprous bromide: CuBr.

Explanation:

a) Ammonia is the neutral substance, which as molecular formula NH₃ when it gains a proton, it becomes the ammonium ion NH₄⁺.

b) In the name of salts, first, it comes the cation name, in this case, all the cations are the magnesium (Mg²⁺). The ions of sulfur can be oxidized or not, the termination "ide" indicates the non-oxidized ion (S⁻²), "ite" the less oxidized (SO₃⁻²), and "ate" the more oxidized (SO₄⁻²). To do the molecular formula, the charges are replaced without the signals and put down. If they are equal, the number is not put.

Magnesium sulfide: MgS

Magnesium sulfite: MgSO₃

Magnesium sulfate: MgSO₄

c) The acids can be oxidized or not, when it has no oxygens, the name is given "hydro" + the anion name, as hydrochloric acid (HCl). When there's oxygen in the molecule, the more oxidized is name as "'per" + anion name + "ic", the second more oxidized as anion name + "ic", the second less oxidized as anion name + "us", and the less oxidized as "hypo" + anion name + "us". In this case:

chloric acid: HClO₃

chlorous acid HClO₂

d) The salts of copper are named depends on the oxidation number of the cupper. The one with a higher oxidation number( +2) is called cupric, and the other (+1), cuprous. Thus:

cupric bromide: CuBr₂ (oxidation number = +2)

cuprous bromide: CuBr (oxidation number = +1)

5 0

3 years ago

Read 2 more answers