Find the Protons and Electrons for nitrogen -3 ion with 7 neutrons.

The numbers that will be rounded up are 124.77, 7.077, 19.45 and 3.179  and the numbers which will be rounded down are 4.318, 8878.2403, 66.9106 and 5.84.

To round off the decimal numbers to their nearest tenths, we look at the  number on the hundredth place. If that particular number is greater than 5, we add 1 to the tenth value. If the number is less than 5, we leave the tenth place value as it is, and we also remove all the numbers which are present after the tenth’s place.

The numbers which will be rounded up are 124.77, 7.077, 19.45 and 3.179 since the digit on the hundredth place are greater than 5. The numbers which will be rounded down are 4.318, 8878.2403, 66.9106 and 5.84 since the digit on the hundredth place is lower than 5.

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3.73 × 10⁻¹²J/mol is the energy of a single UV photon and 1 mole of UV photons having a wavelength of 32 nm.

A photon is a microscopic particle made up of electromagnetic radiation waves. Maxwell demonstrated that photons are merely electric fields moving through space. Photons move at the speed of light and have no charge or rest mass.

According to Planck's Law, electromagnetic radiation from heated bodies is not released in a continuous stream but rather as discrete energy units called quanta, the size of which depends on a fundamental physical constant.

E .. hc/λ

λ is 32nm

h is 6.626*10⁻³⁴Js

c is 3 × 10⁸m/s

E of single photon will be (6.626*10-34 * 3*10⁸)/32*10⁹

i.e. 0.62*10⁻³⁵J

1 mol UV photons = 6.022 × 10^23 UV photons.

E of 1 mole = E of single photon *6.022 × 10²³

                   = 0.62*10⁻³⁵ * 6.022 × 10²³

                  = 3.73*10⁻¹²J/mol

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Answer:

Components present of sodium bicarbonate

Sodium bicarbonate is formed by mixing carbon, sodium, hydrogen and oxygen molecules. This mixture, also known as baking soda, is actually a type of salt.

Explanation:

There was an increase in kinetic energy during the segment C and in other segments

Recall: That temperature is a measure of the average kinetic energy, so increasing temperature all cause increasing kinetic energy and vice versa.

However too, the heat energy which is added during the phase change is usually used to overcome forces in order to hold the molecules together.

Kinetic energy is the type of energy an object or a body posesss due to it motion

The body usually maintains it's kinetic energy unless the speed changes

Potential energy is a type of energy an object or a body had due to its relative position.

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Answer:

"The kinetic energy is increasing because the molecules are speeding up"

Explanation:

Answer:I do not know

Explanation: i need to see the statements to be able to give you an answer

Answer:Theres no statements to give you a answer

Answer:

i think its Yes. The bubbles contain hydrogen and oxygen that separated from the water but i could be wrong so i would just wait to see if anybody else says anything

Explanation:

Answer:

Molecules in the gas move faster due to the fact they have more energy

Explanation:

If you put more heat the higher the volume will be. Less heat means less volume.

(have a great day!)

19.42g of fluorine is produced upon decomposition of sodium fluoride.

The mass of a given substance is converted to moles using the molar mass of this substance in the periodic table. Moles of a given substance are then converted to moles of an unknown substance using the molar ratios from the balanced chemical formulas.

Mass ratio is defined as the percentage composition of the masses of elements in a molecule or compound. A compound always has a defined mass fraction of the corresponding element.

Mass ratio of sodium to fluorine = 1.21:1

If the mass of sodium fluoride produced is 23.5 g

Using dimensional Analysis,

(23.5g of sodium/sodium fluoride)×(1 g of Fluorine/1.21 g of sodium)

= 19.42g(g of fluorine/g of sodium fluoride)

Mass of fluorine produced = 19.42g

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There are 0.25 moles of HCl present in 250 mL of 1.0 M HCl.

We have to calculate the number of moles of HCl present in some mL of 1.0M HCl.  A mole is defined as the amount of substance in a system that contains as many elementary entities as there are atoms in 0.012 kg of carbon 12. We represent mole by the symbol 'mol'. Now, we will see how to calculate the number of moles.

We can calculate the number of moles of a substance using the following expression;

Molarity = no of moles of an element/volume

According to this question, we were given 250. mL of 1.0 M HCl. The number of moles will be calculated by the formula as follows;

no of moles of HCl = 0.250L × 1.0M

no of moles of HCl = 0.250 moles.

Therefore, 0.25 moles are present in 250 mL of 1.0 M HCl.

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Answer:

mALCL3 =1157 G

Explanation:

I think so

Answer:

70 grams

Explanation:

that's my answer

Answer:

17.86mL of the HCl solution

Explanation:

The reaction of CaCO₃ with HCl is:

CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O

The concentration of HCl with a pH of 1.52 is:

pH = 1.52 = -log [H⁺]

[H⁺] = 0.0302M = [HCl]

27.0mg = 0.0270g of CaCO₃ (Molar mass: 100.09g/mol) are:

0.0270g of CaCO₃ ₓ (1mol / 100.09g) = 2.70x10⁻⁴ moles of CaCO₃

Moles of HCl to react completely with these moles of CaCO₃ are:

2.70x10⁻⁴ moles of CaCO₃ ₓ (2 mol HCl / 1 mol CaCO₃) =

5.40x10⁻⁴ moles of HCl

As the concentration of HCl is 0.0302M, volume in 5.40x10⁻⁴ moles is:

5.40x10⁻⁴ moles of HCl * (1L / 0.0302mol) = 0.01786L =

The volume in milliliters (mL) of an HCl solution with a pH of 1.52 that can be neutralized by the given CaCO₃ is 17.87 mL

From the question,

We are to determine the volume of HCl that could be neutralized by the given CaCO₃

First, we will write the balanced chemical equation for the reaction

The balanced chemical equation for the reaction is

2HCl + CaCO₃ → CaCl₂ + CO₂ + H₂O

This means

2 moles of HCl is required to neutralize 1 mole of CaCO₃

Now, we will determine the number of moles of CaCO₃ present

Mass of CaCO₃ = 27.0 mg = 0.027 g

Using the formula

\(Number\ of\ moles = \frac{Mass}{Molar\ mass}\)

Molar mass of CaCO₃ = 100.0869 g/mol

∴ Number of moles of CaCO₃ present = \(\frac{0.027}{100.0869}\)

Number of moles of CaCO₃ present = 0.00026977 mole

Since

2 moles of HCl is required to neutralize 1 mole of CaCO₃

Then,

0.00053954 mole of HCl will be required to neutralize the 0.00026977 mole of CaCO₃

∴ 0.00053954 mole of HCl is required to neutralize the CaCO₃

Now, for the volume of HCl solution with a pH of 1.52 required

First,

We will determine the concentration of the HCl

From the given information

pH of the HCl = 1.52

Using the formula

pH = -log[H⁺]

Then,

1.52 = -log[H⁺]

∴ [H⁺] = 10^(-1.52)

[H⁺] = 0.0302 M

∴ The concentration of the HCl is 0.0302 M

Now, for the volume

Using the formula,

\(Volume = \frac{Number\ of\ moles}{Concentration}\)

∴ Volume of HCl required = \(\frac{0.00053954}{0.0302}\)

Volume of HCl required = 0.01787 L

Volume of HCl required = 17.87 mL

Hence, the volume in milliliters (mL) of an HCl solution with a pH of 1.52 that can be neutralized by the given CaCO₃ is 17.87 mL

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At equilibrium, the number of moles of Cl2(g) present is approximately 347.37 mol.

To determine the number of moles of Cl2(g) at equilibrium, we need to use the given equilibrium constant (Kc) and set up an ICE table to track the changes in the reactants and products.

The balanced equation for the reaction is:

CO(g) + Cl2(g) ⇌ COCl2(g)

Let's set up the ICE table:

  CO(g)     +     Cl2(g)     ⇌     COCl2(g)

Initial: 0.3500 0.05500 0

Change: -x -x +x

Equilibrium: 0.3500 - x 0.05500 - x x

Using the equilibrium concentrations in the ICE table, we can write the expression for the equilibrium constant (Kc) as:

Kc = [COCl2(g)] / [CO(g)][Cl2(g)]

Substituting the values into the equation, we have:

1.2 × 10^3 = (0.05500 - x) / [(0.3500 - x)(0.05500 - x)]

Simplifying the equation, we can cross-multiply and rearrange:

1.2 × 10^3 × (0.3500 - x)(0.05500 - x) = 0.05500 - x

Expanding and rearranging, we get:

0 = (1.2 × 10^3 × 0.05500 - 1.2 × 10^3x + 0.05500x) - x

Simplifying further:

0 = 66 - 1.245x + 0.05500x - x

0 = 66 - 0.19x

0.19x = 66

x = 66 / 0.19

x ≈ 347.37

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Plants do not have bones that provide them with structure and support, they have tubes made of cellulose; option A.

The Achilles is a tendon and not a ligament; option D

The type of organism that has an exoskeleton is crustacean; option C.

All organisms have either an endoskeleton or an exoskeleton is False because plants do not have either an endoskeleton or an exoskeleton.

Plants unlike animals do not have skeletons that provide shape and support to them.

Instead, plants have sclerenchyma cell walls which are composed of lignin and extra cellulose. These provide support and shape to plants.

Ligaments are structures found in joints and other parts of the body that provide support to bones, joints, organs, and other structures.

Ligaments in the body include;

Exoskeletons are found in small animals and insects. For example, crustaceans have an exoskeleton.

Other larger organisms such as mammals. have an endoskeleton.

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A descriptive model of Earth's layers can be categorized as prototype model. Hence, option B is correct.

What is a descriptive model?

A descriptive model describes a system or other entity and its relationship to its environment.

The Earth has different compositional and mechanical layers. Compositional layers are determined by their components, while mechanical layers are determined by their physical properties.

The outermost solid layer of a rocky planet or natural satellite. Chemically distinct from the underlying mantle.

Hence, option B is correct.

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Answer:

Here is the correct order (ascending order):

gene, DNA, chromosome, nucleus, cell, organism.

A gene is a segment of DNA that contains the instructions for building a protein or RNA molecule. DNA is the molecule that carries genetic information and makes up genes. A chromosome is a structure made of DNA and protein that carries genes. A nucleus is a membrane-bound organelle that contains chromosomes. A cell is the smallest structural and functional unit of living organisms, consisting of a nucleus (or nucleoid in prokaryotes) and cytoplasm. An organism is an individual living entity, such as a plant, animal, or bacterium, that consists of multiple cells.

Answer:

The volume of the solution must be increased to 71.429 millimeters by adding 66.359 millimeters of solute to reduce molarity from 6.82 M to 0.49 M.

Explanation:

The molarity is a unit used for solution that is equivalent to the amount of moles of solute per unit volume of solution. That is:

\(M = \frac{n_{st}}{V_{sol}}\)

Where:

\(n_{st}\) - Amount of moles of solute, measured in moles.

\(V_{sol}\) - Volume of the solution, measured in liters.

To reduce the molarity of the solution, more millimeters of solvent should be added. Firstly, the amount of moles of acetic acid inside the 6.82 M solution needs to be determined (\(M_{o} = 6.82\,M\) and \(V_{sol} = 5.07\times 10^{-3}\,L\)):

\(n_{st} = M_{o}\cdot V_{sol}\)

\(n_{st} = (6.82\,M)\cdot (5.07\times 10^{-3}\,L)\)

\(n_{st} = 0.035\,mol\)

Now, the resulting volume of solution after diluting the acetic acid solution is: (\(M_{f} = 0.49\,M\) and \(n_{st} = 0.035\,mol\)):

\(V_{sol} = \frac{n_{st}}{M_{f}}\)

\(V_{sol} = \frac{0.035\,mol}{0.49\,M}\)

\(V_{sol} = 71.429\times 10^{-3}\,L\)

\(V_{sol} = 71.429\,mL\) (1 L = 1000 mL)

The amount of solvent needed to dilute the solution is:

\(\Delta V_{sol} = 71.429\times 10^{-3}\,L - 5.07\times 10^{-3}\,L\)

\(\Delta V_{sol} = 66.359 \times 10^{-3}\,L\)

\(\Delta V_{sol} = 66.359\,mL\) (1 L = 1000 mL)

The volume of the solution must be increased to 71.429 millimeters by adding 66.359 millimeters of solute to reduce molarity from 6.82 M to 0.49 M.

Answer:

14 moles of oxygen needed to produce 12 moles of H2O.

Explanation:

We are given that balance eqaution

\(2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O\)

We have to find number of moles of O2 needed  to produce 12 moles of H2O.

From given equation

We can see that

6 moles of   H2O produced by Oxygen =7 moles

1 mole of   H2O produced by Oxygen=\(\frac{7}{6}\)moles

12 moles of H2O produced by Oxygen=\(\frac{7}{6}\times 12\)moles

12 moles of H2O produced by Oxygen=\(7\times 2\)moles

12 moles of H2O produced by Oxygen=14 moles

Hence, 14 moles of oxygen needed to produce 12 moles of H2O.

The amount of oxygen required for the combustion of ethane to produce 12 moles of water is 14 moles.

The moles of oxygen produced in the reaction can be given from the stoichiometric law of the balanced chemical equation.

The balanced chemical equation for the combustion of ethane is:

\(\rm 2\;C_2H_6\;+\;7\;O_2\;\rightarrow\;4\;CO_2\;+\;6\;H_2O\)

The 6 moles of water are produced from 7 moles of oxygen. The moles of oxygen required to produce 12 moles of water are:

\(\rm 6\;mol\;H_2O=7\;mol\;Oxygen\\12\;mol\;H_2O=\dfrac{7}{6}\;\times\;12\;mol\;O_2\\ 12\;mol\;H_2O=14\;mol\;O_2\)

The moles of oxygen required to produce 12 moles of water are 14 moles.

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Therefore,  the mass in grams of the dihydrate H2C2O4 • 2 H2O (molar mass = 126.0 g/mol) is needed in order to make 100.0 mL of a 0.356 M solution of H2C2O4 is 4.49g.

To calculate the  mass in grams of the dihydrate H2C2O4 • 2 H2O we first need to find the moles of H2C2O4.

Moles of solute = molarity * litres in solution.

             = 0.356 *0.01L=0.0356moles.

since dihydrate H2C2O4 • 2 H2O  has molar mass of 126.0g/mol it means it has a mass of 126g.

By using mole to mass conversion.

mass of H2C2O4 • 2 H2O= moles of H2C2O4 • 2 H2O * molar mass of H2C2O4 • 2 H2O

mass of H2C2O4 • 2 H2O= 0.0356moles * 126glmol

                                         =4.49g.

Therefore,  the mass in grams of the dihydrate H2C2O4 • 2 H2O (molar mass = 126.0 g/mol) is needed in order to make 100.0 mL of a 0.356 M solution of H2C2O4 is 4.49g.

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Answer:

D

Explanation:

We have that the  the density of FeS  is mathematically given as

From the question we are told

Iron(II) sulfide has a primitive cubic unit cell with sulfide ions at the lattice points.

The ionic radii of iron(II) ions and sulfide ions are 88 pm and 184 pm, respectively.

What is the density of FeS (in g/cm3)?

Generally the equation for the Velocity  is mathematically given as

\(V_c=a^3=(2\pi Fe^{2+}+2\pi S^{2-})^3\\\\Therefore\\\\V=a^3(2\pi*0.088+2\pi 0.184)^3\\\\V=16.98*10^{-23}\\\\Therefore\\\\\phi=n\frac{PFeion+PSion}{VNa}\\\\\phi=3*\frac{55.85+32}{16.9*10^{-23}*6.023*10^{23}}\)

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Answer:

(D) The minimal chance that the newly formed neutrons of a fission

Explanation:

I got it right on A P E X

Answer:

D. the minimal chance that the newly formed neutrons of a fission

reaction are absorbed by more atoms.

Explanation:

took test

Answer:

It amplifies the picture of something far away.

Explanation:

Answer:

Light from the moon reflects from large mirror, bent by small mirror, focused at focal point, magnified by eyepeice.

Explanation:

Answer:

all living things need water. no water, no life.