En un tomo neutro el numero atomico es al numero de netrones como 7 es a 5 . si el numero de masa es 84. hallar el numero de electrones?

Answer:

Explanation:

pH = -log{H+]

{H+} = 10^(-pH)

pOH = 14 - pH

{OH-} = 10^(-pOH)

pH 2.90 (the approximate pH of lemon juice

{H+} = 10^(-2.9)

pOH = 14 - 2.9 = 11.1

{OH-} = 10^(-pOH) = 10^(-11.1)

pH 3.86 (the approximate pH of sauerkraut)

{H+} = 10^(-3.86)

pOH = 14 - 3.86 = 10.14

{OH-} = 10^(-pOH)  = 10^(-10.14)

pH 10.81 (the approximate pH of milk of magnesia)

{H+} = 10^(-10.81)

pOH = 14 - 10.81 = 3.19

{OH-} = 10^(-pOH) = 10^(-3.19)

pH 4.11 (the approximate pH of orange juice)

{H+} = 10^(-4.11)

pOH = 14 - 4.11 = 9.89

{OH-} = 10^(-pOH) = 10^(-9.89)

pH 11.61 (the approximate pH of household ammonia)

{H+} = 10^(-11.61)

pOH = 14 - 11.61 = 2.39

{OH-} = 10^(-pOH)  = 10^(-2.39)

Answer:

drilling for as much oil as possible for just 10 yearsExplanation:

Answer:

Dealing with the states of both the reactant and product elements

Answer:

Sulfur hexafluoride

Explanation:

Explanation:

but carbon has four Valence Electrons

2.3 mol/1000L

Explanation:

relative humidity (rh)is the ratio of the partial pressure of water at a given temprature

Answer:

8.36 x 10^24 atoms/molecules

Explanation:

Avagadro's Number: 6.02214076 × 10^23

Avagadro's Number shows the number of molecules in 1 mole of substance. In this case, if there is 13.88 moles of lead, we multiply 13.88 by Avagadro's number:

(6.02214076 × 10^23)(13.88) = 8.358536 x 10^24 = 8.36 x 10^24

Answer:

True

Explanation:

Answer:

the answer is

Explanation:

number of mollecoles

In chemistry a coefficient denotes the number that is seen in front of the formula of a equation. The coefficient in the given equation 4CO₂ is 4.

A number which precedes the formulas of reactants and products in order to balance a chemical equation is defined as a coefficient. It represents the number of atoms or molecules of each elements which are present in the reaction.

A chemical equation should be balanced and it must obey the law of conservation of mass which states that the number of reactants and products on both sides of the equation should be equal.

The coefficients are the numbers which are required to balance a chemical equation and it may vary while balancing a equation. The coefficient is found to be 1 if no number is mentioned in front of the formula of the reactants and products.

In the given equation 4CO₂, 4 is the coefficient which shows that 4 'C' atoms and 8 'O' atoms are present in the compound CO₂.

Thus the coefficient in the compound 4CO₂ is 4.

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Answer:There are following reasons:

About 50% fresh water goes waste due to runoff.

More than 1 billion people lack clean drinking water globally.

Population increase is much faster than the increase in the amount of available fresh water.

Per capita availability of fresh water will further decrease in the coming years.

Explanation: PLZ mark Brainlist

The percent yield of the product formed in the experiment is 85.41%.

Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.

In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .

In the given example, actual yield=1.23 g and theoretical yield=1.44 g

Thus on substituting values in the given formula, 1.23/1.44×100=85.41 %.

Thus , the percent yield of sample is 85.41%.

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Answer:

331.2 g/molExplanation:

The molar mass of lead nitrate (Pb(NO₃)₂) is 331 g. Therefore, option B is correct.

The atomic mass of lead (Pb) is 207.2 grams per mole.

The atomic mass of nitrogen (N) is 14.0 grams per mole.

The atomic mass of oxygen (O) is 16.0 grams per mole.

In lead nitrate, 2 nitrate ions (NO₃), so multiply the atomic mass of nitrogen by 2 and the atomic mass of oxygen by 6 (since there are 3 oxygen atoms in each nitrate ion):

2(N) + 6(O) = 2(14.0 g) + 6(16.0 g)

= 28.0 g + 96.0 g

= 124.0 g

Pb(NO₃)₂ = 207.2 + 2(14.01 + 3(16.00))

= 207.2 + 2(14.01 + 48.00)

= 207.2 + 2(14.01 + 48.00)

= 207.2 + 2(62.01)

= 207.2 + 124.02

= 331 g

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Explanation:

A cell is the membrane unit that contains all the fundamental molecules to living life. To make it short nd easy, a cell is the smallest nd basic unit of life, it's responsible for all life's processes. The human body is comped of m(tr)illions of cells, they all each provide different types of functions.

Answer:

- One mole of oxygen was used in this reaction.

- Two moles of water were produced from this reaction.

Explanation:

In addition: - Two moles of hydrogen were used.

Given the data from the question, the correct statement is:

To know which options are correct, we shall determine the number of mole of O₂ used and the number of mole of H₂O produced.

Balanced equation

2H₂ + O₂ —> 2H₂O

From the balanced equation above,

2 moles of H₂ required 1 mole of O₂

Therefore,

1 mole of H₂ will require = 1 / 2 = 0.5 mole of O₂

Thus, 0.5 mole of O₂ is needed for the reaction

From the balanced equation above,

2 moles of H₂ reacted to produce 2 moles of H₂O

Therefore,

1 mole of H₂ will also react to to produce 1 mole of H₂O

Thus, 1 mole of H₂O was produced from the reaction.

SUMMARY

When 1 mole of H₂ was used in the reaction,

Considering the options given in the question above, the correct statement is:

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Answer:

Matter is never created or destroyed

Answer:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Silver, or 107.8682 grams.

Explanation:

I took a test about this :)

Answer: A

Explanation:

A

Heat is the product of the mass, specific heat, and delta temperature. The gold metal will reach the highest temperature. Thus, option A is correct.

Specific heat (c) is the heat required by a substance to get heated a unit mass by a unit of temperature. The specific heat is given as,

[tex]\rm c = \rm \dfrac{Q}{m \times \Delta T}[/tex]

Here, Q is the heat applied, m is the sample's mass and delta T is the change in the temperature.

The value of heat applied is the same for all the metals, so a change in temperature is calculated as,

[tex]\rm \Delta T = \rm \dfrac{Q}{c . m }[/tex]

From this, it can be said that the temperature is inversely related to the specific heat of the metal and hence the metal having the smallest c will have the highest change in the temperature.

Therefore, gold (c = 0.129 J/(g°C)) will reach the highest temperature.

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Answer:

you hot A S F

Explanation:

Answer:

4K + O₂ → 2K₂O

Los reactivos son: Potasio, Oxígeno, y óxido de potasio

Explanation:

El elemento químico número 19 es el potasio, un metal alcalino (Los metales alcalinos tienen estado de oxidación +1).

El óxido correspondiente debe tener fórmula K₂O (Oxígeno con carga -2 y 2 átomos de potasio con carga +1 dan el óxido neutro). La reacción es:

Answer: everybody report fNnasks he doesn't answer nobody question if you see it like you told me do it yourself science is super easy

Explanation:

Explanation:

[tex]CH _{3}CH _{2}COOCH _{2} CH _{2}CH _{2}CH _{2}CH _{2}CH _{3}[/tex]

NAME: Hexylpropenoate

Answer:

wavelength is inversely proportional to frequency.

frequency determines pitch of sound.

we hear sound differently.

when the wavelength or distance is short we Hear high sound .

when the wavelength or distance is high we Hear low sound .

Answer:

The positive and negative electrons (or protons, don't really know) are opposites, so they attract each other, giving a whole new meaning to "Opposites attract."

Explanation:

Answer:

option A,B,C

Explanation:

HCl

H2O

HC2H3O2

In the list given , following substance are classified as Acid:

HCl , HC₂H₃O₂ .

What is an Acid ?

A substance that can donate a proton or accept an electron pair to form a bond is called an Acid.

An acid turns Litmus paper red and has pH < 7 , It has the property of neutralizing alkali.

It has sour taste and can dissolve metals.

HCl is a strong acid , H₂O is neutral , HC₂H₃O₂ (Acetic acid) is a weak acid , NaCl is Salt , KOH and Mg(OH)₂ are strong base.

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Answer:

A

Explanation:

Most of the world's active volcanoes are located along or near the boundaries between shifting plates and are called "plate-boundary" volcanoes.

Answer:

D

Explanation:

earth orbits the sun. the sun doesn’t orbit around earth. and moon take 27 days around the earth