How did Moseley establish a more accurate periodic table?

Answers

Answer 1

Answer: Moseley established a more accurate periodic table by closer determination of atomic numbers. Through the results of his measurements of the wavelengths of the X-ray spectral lines of a number of elements which showed that the ordering of the elements by atomic number.

Answer 2

Answer:

Answer:

B. by arranging the elements according to atomic number instead of atomic mass

Explanation:

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What is the value for ΔSºreaction for the following reaction, given the standard entropy values? Al2O3(s) + 3H2(g) → 2Al(s) + 3H2O(g) –35 J/mol*K +35 J/mol*/K +179 J/mol*K –179 J/mol*K

Answers

Let me help you by giving the formula as it will be more useful for you. $delta S = Sum(n) (Delta S(products)) - Sum(m)(Delta S(reactants))$ . There are m and n in formula that are coefficients of the reactants and products that are given in the equation.

The answer is C just got it right

Which isotope will spontaneously decay and emit particles with a charge of +2?(1) 53Fe (3) 198Au
(2) 137Cs (4) 220Fr

Answers

Answer: The correct option is 4.

Explanation: All the options will undergo some type of radioactive decay processes. There are 3 decay processes:

1) Alpha decay: It is a decay process in which alpha particle is released which has has a mass number of 4 and a charge of +2.

$_Z^A\textrm{X}\rightarrow _(Z-2)^(A-4)\textrm{Y}+_2^4\alpha$

2) Beta-minus decay: It is a decay in which a beta particle is released. The beta particle released has a mass number of 0 and a charge of (-1).

$_Z^A\textrm{X}\rightarrow _(Z+1)^A\textrm{Y}+_(-1)^0\beta$

3) Beta-plus decay: It is a decay process in which a positron is released. The positron released has a mass number of 0 and has a charge of +1.

$_Z^A\textrm{X}\rightarrow _(Z-1)^A\textrm{Y}+_(+1)^0\beta$

For the given options:

Option 1: This nuclei will undergo beta-plus decay process to form $_(25)^(53)\textrm{Mn}$

$_(26)^(53)\textrm{Fe}\rightarrow _(25)^(53)\textrm{Mn}+_(+1)^0\beta$

Option 2: This nuclei will undergo beta-minus decay process to form $_(80)^(198)\textrm{Hg}$

$_(79)^(198)\textrm{Au}\rightarrow _(80)^(198)\textrm{Hg}+_(-1)^0\beta$

Option 3: This nuclei will undergo a beta minus decay process to form $_(56)^(137)\textrm{Ba}$

$_(55)^(137)\textrm{Cs}\rightarrow _(56)^(137)\textrm{Ba}+_(-1)^0\beta$

Option 4: This nuclei will undergo an alpha decay process to form $_(85)^(216)\textrm{At}$

$_(87)^(220)\textrm{Fr}\rightarrow _(85)^(216)\textrm{At}+_2^4\alpha$

Hence, the correct option is 4.

It is 220Fr that would spontaneously decay and emit particles with a charge of +2.

What is the chemical formula of iron (III) sulfide?
A. FeS
B. Fe2S3
C. Fe2(SO3)3

Answers

Chemical formula of iron (III) sulfide is Fe₂S₃.

What is chemical formula?

A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus and minus signs.

We can write a chemical formula by following steps-

1. Write both the atoms that are present in the chemical compound.

2. Write the valencies of both the atoms that are present in the chemical compound.

3. Now cross multiply both the atoms such that 1 atom's valency goes to the subscript of another atom and vice versa.

Given,

oxidation state of Fe = +3

Valency of Fe = 3

Valency of sulphide ion = 2

When we cross multiply both the atom's valencies we get chemical formula of iron (III) sulfide as Fe₂S₃.

Therefore, chemical formula of iron (III) sulfide is Fe₂S₃.

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the answer is i think B

How many molecules are there in 5.0g of C2H5OH?

Answers

About 6.5x10^22 molecules.(5g C2H5OH)x(1 mol C2H5OH/46g C2H5OH)x(6.02x10^23 molecules C2H5OH/1 mol C2H5OH)=(3.01E24)/46=6.5x10^22.Let me know if this helped!

What does the atomic mass describe?a. The mass of the protons in the atom
b. The mass of the nucleus of the atom
c. The mass of the neutrons in the atom
d. The mass of the electrons in the atom

Answers

B., the mass of the nucleus of the atom.
Both the protons and the neutrons are inside the nucleus. The atomic number of an atom is the number of protons, and if you subtract the atomic number from the atomic mass you can find the number of neutrons an atom has.
So, the mass of the protons plus the mass of the neutrons, which are both inside the nucleus, equals the atomic mass.

What is the complete ionic equation for this reaction?2KOH(aq) + H2SO4(aq) → 2H20(1) + K2SO4(aq)
O A. 2K+ + OH + H2SO4 → OH + 2H+ + K2SO4
B. OH + 2H+ + 2H20()
C. 2KOH + H2SO4 → 2H20 + K2SO4
D. 2K+ + OH + 2H+ + SO42- → 2H20() + 2K+ + SO42-
SUBMIT

Answers

Answer:

The answer is "Option D".

Explanation:

The entire ionic equation for all the substances, which are ionic compounds but are available in an aquatic is represented in the form with ions in the full ionic equation.

In the Net ionic equation, it doesn't have the particulate matter throughout the net ionic equations throughout the equations.

In the Spectator ions, it doesn't participate in interactions mostly on reaction and the material hand. From both sides, the very same ions are present.

The evenly balanced chemical formula is,

$2KOH (aq)+ H_2SO_4(aq) \longrightarrow 2H_2O(l) + K_2SO_4$

It is the separate organic compound that full ion formula will match the choice D.

Final answer:

The complete ionic equation for the reaction is 2K+ + 2OH- + 2H+ + SO42- → 2H2O + 2K+ + SO42-.

Explanation:

The complete ionic equation for the reaction 2KOH(aq) + H2SO4(aq) → 2H20(l) + K2SO4(aq) is:

2K+ + 2 OH- + 2 H+ + SO42- → 2 H2O(l) + 2 K+ + SO42-

The equation is balanced in terms of mass and charge by adding spectator ions (K+ and SO42-). The net ionic equation can be obtained by eliminating the spectator ions, leaving only the species that undergo a chemical change.

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