As a consequence of the discovery of the nucleus by Rutherford, which model of the atom is thought to be true?Protons, electrons, and neutrons are evenly distributed throughout the volume of the atom.
Electrons are distributed around the nucleus and occupy almost all the volume of the atom.
The nucleus is made of electrons and protons.
The nucleus is made of protons, electrons, and neutrons.

Answers

Answer 1

Answer:

The answer is (B) Electrons are distributed around the nucleus and occupy almost all the volume of the atom.

Answer 2

Answer: As a consequence of the discovery of the nuElectrons are distributed around the nucleus and occupy almost all the volume of the atom.cleus by Rutherford, the model of the atom is thought to be true is

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The concentration of hydrogen peroxide (H2O2) can be determined by titrating it with an acidified MnO4− solution. The following is an unbalanced equation. MnO4− (aq) + H2O2 (aq) → O2 (g) + Mn2+ (aq)

(a) Balance the above redox reaction.
(b) Determine the concentration of H2O2 solution in molarity if 10.00 mL of this solution requires 20.00 mL of 1.5 M MnO4− for a complete reaction.

Answers

Answer:

A) ${MnO_4}^- + 3 H^+ + (5)/(2) H_2O_2 \rightarrow Mn^(2+) + 4 H_2O + (5)/(2) O_2$

B) 7.5 molar

Explanation:

A)Reduction

${MnO_4}^- + 8 H^+ + 5e^- \rightarrow Mn^(2+) + 4 H_2O$

Oxidation

$H_2O_2 \rightarrow O_2 + 2 H^+ + 2e^-$

Multiplying the oxidation reaction by 5/2 and adding it to the reduction equation:

${MnO_4}^- + 8 H^+ + 5e^- \rightarrow Mn^(2+) + 4 H_2O$

$(5)/(2) H_2O_2 \rightarrow (5)/(2) O_2 + 5 H^+ + 5e^-$

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${MnO_4}^- + 3 H^+ + (5)/(2) H_2O_2 \rightarrow Mn^(2+) + 4 H_2O + (5)/(2) O_2$

B) 10 ml = 0.01 L

20 ml = 0.02 L

mol of MnO4− = molarity*volume = 1.5*0.02 = 0.03

1 mol of MnO4− reacts with 5/2 mol of H2O2, then:

mol of H2O2 = 0.03*5/2 = 0.075

molarity = mol/volume = 0.075/0.01 = 7.5 molar

What can be said about the polarity of the C=O bond? A) C and O have the same electronegativity; the bond is nonpolar B) the C=O bond is polar; the O atom bears a partial negative charge C) the C=O bond is nonpolar; the C atom bears a partial positive charge D) the C=O bond is polar; the C atom bears a partial negative charge

Answers

Answer:

The correct answer is B) the C=O bond is polar; the O atom bears a partial negative charge.

Explanation:

In a C=O bond, the oxygen (O) atom is more electronegative than the carbon (C) atom. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. Oxygen has a higher electronegativity than carbon, so it pulls the shared electrons in the C=O bond closer to itself.

As a result, the oxygen atom gains a partial negative charge (δ-) because it has a higher electron density around it, while the carbon atom gains a partial positive charge (δ+) because it has less electron density around it.

This uneven distribution of electron density in the C=O bond leads to polarity, making the bond polar. The oxygen atom, being more electronegative, attracts the shared electrons more strongly, creating a partial negative charge on the oxygen atom and a partial positive charge on the carbon atom.

In summary, the C=O bond is polar, and the oxygen atom bears a partial negative charge (δ-).

Calculate the density of a rectangular metal bar that is 7.00 cm long, 4.00 cm wide, and 1.00 cm thick and has a mass of 352 g is?

Answers

Density is mass divided by volume (d=m/v)
To calculate volume you multiply the length, width, and height of the object (v=lwh)
In this example, we get a product of 28
So 352/28 is 12.57142.... Round to the nearest decimal place indicated in your instructions or keep as is

Answer:

12.58 g/cm³

Explanation:

V = 7×4×1 = 28cm³

ρ = m/V = 352/28 ≈ 12.58 g/cm³

What is the formula of the compound formed between the potassium ion and the sulfide ion?

Answers

Potassium sulphide has the chemical formula $k_(2)$ S .

What do you mean by Chemical formula ?

A chemical formula is a phrase that lists the constituent parts of a compound together with their relative proportions. No subscript is used if there is just one atom of a certain kind.

Alkali metals in Group 1A produce plus-one ions because they wish to give up their valence electron in their outer shell.

In order to have a complete octet in its outermost shell, sulphur, which is found in the chalcogens, needs to gain two electrons.

Thus, Potassium sulphide has the chemical formula $k_(2)$ S .

To learn more about Chemical formula, refer to the below link:

brainly.com/question/21272841

# SPJ2

The formula for K+ and S-2 is K2S because you need 2 potassium ions to balance out the sulfide ion

After doing multiple titrations, your NaOH solution is determined to have a mean concentration value of 0.100 M. Given you are to assume your unknown acid is 75.0% KHP, how many grams of your unknown will you need to use 15.00 mL of your 0.100 M standardized NaOH

Answers

Answer: The mass of unknown acid needed is 0.230 grams

Explanation:

To calculate the number of moles for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Molarity of NaOH solution = 0.100 M

Volume of solution = 15.00 mL = 0.015 L (Conversion factor: 1 L = 1000 mL)

Putting values in above equation, we get:

$0.100M=\frac{\text{Moles of NaOH}}{0.015L}\n\n\text{Moles of NaOH}=(0.100mol/L* 0.015L)=0.0015mol$

The chemical reaction for the reaction of KHP and NaOH follows

$KHC_8H_4O_4(aq.)+NaOH\rightarrow KNaC_8H_4O_4(aq.)+H_2O(l)$

By Stoichiometry of the reaction:

1 mole of NaOH reacts with 1 mole of KHP.

So, 0.0015 moles of NaOH will react with = $(1)/(1)* 0.0015=0.0015mol$ of KHP

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of KHP = 0.0015 moles

Molar mass of KHP = 204.22 g/mol

Putting values in above equation, we get:

$0.0015mol=\frac{\text{Mass of KHP}}{204.22g/mol}\n\n\text{Mass of KHP}=(0.0015mol* 204.22g/mol)=0.306g$

We are given:

Mass of unknown acid = 75 % of Mass of KHP

So, mass of unknown acid = $(75)/(100)* 0.306=0.230g$

Hence, the mass of unknown acid needed is 0.230 grams

A neutron star that spins and emits beams of energy is called a _____.protostar
red dwarf
white dwarf
pulsar
black hole

Answers

Answer:

The correct answer is pulsar.

Explanation:

Protostar : Its a young star with contracting mass which gains mass from its parent molecular cloud. At this stage fusion process does not start.

Red dwarf: A star having lower surface temperature , luminosity, mass and size than of the sun.

White dwarf : its an ultimate stage for an average mass star like sun . its a small dense star with size relatively equal to planet.

Pulsar : A rotating neutron star that emits beam of radio waves and other electromagnetic radiations.

Black hole: It is region of space time with very strong gravitational pull that even smallest particle or electromagnetic wave is incapable to escape it.

I believe its a pulsar

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