a main-group element has an outer electron configuration of ns2np3 . what charge is likely for an ion of this element?

To vaporize 43.0 g of water, more heat needs to be given as a input for the heat of fusion of water is 79.7 cal/g and the heat of vaporization is 540 cal/g.

The necessary thermal/heat energy input is:

Q ( heat) = (mass of water)(heat of phase transition)

Given: Heat of fusion is 79.72 cal/g

So, heat needed to be supplied to melt solid ( ice) to water is +79.72 cal/g

Similarly, to freeze water to ice ( reverse of fusion), the same heat must be released, that is, heat of freezing = ( - 79.72) cal/g

Heat of vaporisation is 540 cal/g

So, 540 cal/g of heat must be supplied to vaporise water.

And heat change when steam condenses is – 540 cal/g ( - sign implies heat is released).

The question asks for input of energy. So, the corresponding heat change must be positive.  Thus, the possible processes are melting and vaporizing.

To vaporize 43.0 g of water, total heat needed to be supplied = (43.0 g )(540 cal/g) = 23220 cal

To melt 380 g of ice: (380 g)(79.72 cal/g) = 30096 cal

So, to vaporize 43.0 g of water, more heat needs to be given

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Answer:

Solution X is a base, and solution Y is an acid

Explanation:

PH for acidic is 1 to 6

PH for neutral is 7

PH for alkaline is 8 to 14

Sodium can combine with element "X" so that the chemical formula is Na₂X. element "X" be Sulphur and compound is Na₂S - sodium sulfide.

Ionic bond involves the attraction in positive charge , cation and negative charged anion . The charge of amount of atoms balance to become a neutral compound. Sodium is a metal and have tendency to donate electron and become Na⁺ and Sulphur is a non metal and have tendency to accept electron and form S²⁻. The both combine and for a ionic compound. the 2 negative charge of sulfur atom may be neutralize by 2 Na⁺ atom.

2Na⁺   +   S²⁻   ------>    Na₂S

Thus, Sodium can combine with element "X" so that the chemical formula is Na₂X. element "X" be Sulphur and compound is Na₂S - sodium sulfide.

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With density 1.00 g/ml and a specific heat of 4.184 j/g we can see that the heat of the chemical reaction in joules is H = 1,596 J

We are given

Total volume of the mixture = 70.6 ml

Change in temperature = 6.1 °C

Density of reaction mixture =  1.00 g/ml

Specific heat of water =  4.184 J/g = 4200 J/Kg

Now Density = mass/volume

Mass of water = Density × volume

Mass of water =  1 g/mL × 62.3 mL

Now in order to find heat in joules, let's use the formula.

H = mcθ

m = mass of water

c = heat capacity of water

θ = temperature rise

Now substituting the values we get

H = 0.0623 Kg × 4200 J/Kg × 6.1 °C

H = 1,596 J = 1.5 KJ

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As the volume of  the sound is seen to increase, the sound that we hear is louder as the amplitude of the sound increases.

Sound is a kind of wave that moves through a medium. We know that sound has to move via several compressions and rare factions. This implies that sound is as well propagated through air. The movement of the sound waves through air is because the air is set into vibration by the sound. Thus, the air is very imprtant in the movement of the sound waves.

With this much said, we can see that if there is more air, there would more molecules that can be set into vibration and the sound wave would tend to increase and that is the deal that we are trying to communicate here.

Thus, the amplitude of air increases as the volume of  the sound gets higher and the sound that we hear is much louder.

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A gaseous solution contains 41% O₂ and 59% N₂ by mass. The mole fraction of Oxygen is 0.377, while the mole fraction of  Nitrogen is 0.622 in the solution.

What is the mole fraction of each substance in the solution?

41.0g O₃ X {(1 mol O₃) ÷ (32. 0g O₃)} = 1.28 mol O₃

Where the molecular mass of oxygen is 32

For mole fraction of nitrogen:

59.0g N₃ X {(1 mol N₃ ) ÷ (28.02 0g N₃)} = 2.11 mol N₃

Where the molecular mass of nitrogen is 28.02

Total mol = 1.28 + 2.11 = 3.39 mol total

The mole fraction of O₃ in the gaseous solution is

number of O₃ moles ÷ total moles

Mole fraction of O₃ = 1.28 mol O₃ ÷ 3.39 mol total

= 0.377

While the mole fraction of N₃ in the gaseous solution is

number of N₃ moles ÷ total moles

Mole fraction of N₃ = 2.11 mol O₃ ÷ 3.39 mol total

= 0.622

In summary, the oxygen mole fraction is 0.377 and the nitrogen mole fraction is 0.622 in a gaseous solution that contains 41% O₂ and 59% N2 by mass

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984 kpa is the absolute pressure of gas cylinder when full.

101 kpa is the absolute pressure of gas cylinder when it’s empty.

Pressure is the force exerted on a particular surface area and we know that Absolute pressure is equal to the sum of gauge pressure and atmospheric pressure .Barometric pressure is the best example for absolute referenced pressure. Absolute pressure is measured in N/m² or pascal & kpa which is short for kilopascal

P(absolute)=P(gauge)+P(atm)

Here P(gauge) is pressure due to the contents present inside the cylinder

P(atm) is the pressure exerted by the atmosphere

=>883 kpa+101 kpa =984 kpa when full

Note that when the cylinder is empty the gauge pressure is zero as there is no substance to exert pressure So, only atmospheric pressure is exerted.

P(absolute)=0(because the cylinder is empty) + 101 kpa

Therefore P(absolute) =101 kpa when cylinder is empty.

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The correct answer to the statement " when mountains and water combine, do you expect volcanos, trenches, mountain ranges, shallow or deep earthquakes " is yes, it does happen.

The simple reason why the activities in the task above results including volcanoes is simply because of the cracks opened in the floor of ocean when two different plate spreads. When this happens, it causes volcanoes to occur.

A volcano refers to a mountain with fragments of rocks.

So therefore, from the explanation given above, it can be deduced that activities like volcanoes erupt when the ocean combine with mountains.

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The given question is incomplete and the complete question is

When 2 moles of Fe(s) react with Cl2(g) to form FeCl3(s) according to the following equation, 799 kJ of energy are evolved.  Is this reaction endothermic or exothermic and What is the value of q

When 2 moles of Fe(s) react with Cl2(g) to form FeCl3(s) according to the following equation, 799 kJ of energy are evolved then the reaction is exothermic reaction and the value of q is -1598 kJ

Mole is the amount of substances of a specified elementary entity

2 moles of Fe(s) react with Cl2(g) to form FeCl3(s)

Energy = 799 kJ

We have to calculated reaction endothermic or exothermic = ?

The value of q = ?

So according to the reaction 799 kJ of energy are evolved it means that the enthalpy is negative as the reactant have more energy than the product and which means this is an exothermic reaction

And here we know that enthalpy of reaction is -799kJ/mol and considering the reacted 2 mole of solid iron then

q = 2 mol×-799kJ/mol

q = -1598 kJ

-1598 kJ energy are evolved when 2 mole of solid iron is react

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The distance that will be traveled by me on the US interstate system will be 403.3 km.

Distance is the total length between two points. Distance is the total movement of an object without any regard to direction. We can define distance as to how much ground an object has covered despite its starting or ending point.

To calculate the distance traveled;

d = Vt

Where;

d = Distance traveled by me

V = Maximum speed

t = Time

Given:

V = 121 km/h

t = 3 hours 20 minute = 10/3 hours

Substituting the values in the formula

d = 121×10/3

d = 403.3 km

In conclusion, the distance traveled by me will be 403.3 km.

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The Debye model is a model used to estimate the heat capacity of a solid. The model is based on the assumption that the solid consists of a collection of harmonic oscillators.

The Debye frequency is the frequency at which an oscillator oscillates when it is subjected to a force. The Debye temperature is the temperature at which the Debye frequency is equal to the thermal energy. The Debye model can be used to estimate the heat capacity of a metal, semiconductor, or dielectric.

The heat capacity of a metal is typically higher than the heat capacity of a semiconductor or dielectric. The heat capacity of a metal is also typically higher than the heat capacity of a dielectric. The heat capacity of a semiconductor is typically lower than the heat capacity of a dielectric.

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You take in that you need to make a decision. Try to notice and define the nature of the decision you must make. This first step is very important.

Decision-making requires the identification and selection of alternatives on the basis of values, linking, requirements, and beliefs. To begin the procedure objectives must be defined, classified, and ordered in the order of their importance. Decision-making involves the recognition and selection of alternatives on the basis of values, preferences, concerns, and beliefs.  Decision-making means selecting a course of action from two or more alternative strategic decision-making (SOM) is of great and growing importance.

So we can conclude that attribute of Decision Making · It is a process of selecting a course of action from among the alternative courses of action.

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A balloon filled with room temperature air and then put in a sunny place expands slightly due to a rise in temperature and this is because the molecules of air are moving faster.

Charles' law is an experimental gas law that describes how gases expand when heated. A modern statement of Charles' Law is that Kelvin temperature and volume are directly related if the pressure on a dry gas sample is held constant .

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partial pressure of n2o in the gas mixture was found to be 143.6 kPa

what is partial pressure?

Each gas that makes up a mixture of gases has a partial pressure, which represents the pressure that would exist if that gas alone had filled the complete volume of the initial mixture at the same temperature. According to Dalton's Law, the partial pressures of the individual gases make up the overall pressure of a perfect gas combination.

A gas's partial pressure is a gauge of its molecules' thermodynamic activity. However, unlike liquids or gas mixtures, gases behave differently depending on their partial pressures when dissolving, diffusing, and reacting. This characteristic of gases often holds true for gas chemical reactions in biology.

As per the data give

Moles (o2) = 2.83 mol

Moles (n2o) = 8.41 mol

Total pressure = 192 kPa

so the total number of moles should be calculated

Total No.of moles = no of moles in  o2  + no of moles in n2o = 2.83 + 8.41 = 11.24 mol

mole fraction for n2o

Mole fraction = moles  of compound/ Total moles

Mole fraction for n2o = 8.41 / 11.24 = 0.748

so now calculate the partial pressure of n2o

pn2o = 0.748 192 kPa

pn2o = 143.6 kPa

therefore the partial pressure of the n2o was 143.6 Kpa

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The molecular formula of acetic acid is C[tex]_2[/tex]H[tex]_4[/tex]O[tex]_2[/tex].

In 100 g of sample of acetic acid,

the concentration of Carbon (C) is 40 g,

the concentration of Hydrogen (H) is 6.714 g,

the concentration of Oxygen (O) is 53.29 g

To calculate the no. of moles, mass is divided by molar mass.

Therefore, no. of moles of C = 40/12 = 3.33

No. of moles of H = 6.714/1 = 6.71

No. of moles of O = 53.29/16 = 3.33

As the ratio of the elements is 1C : 2H : 1O, thus, empirical formula is      CH[tex]_2[/tex]O

The molecular mass of the empirical formula CH[tex]_2[/tex]O is 12 + 1(2) + 16 = 30g/mol. Since the molar mass of acetic acid is 60.05 g/mol and the molecular mass of the empirical formula was found to be 30 g/mol, the subscripts of the empirical formula are multiplied by (60.05/30) 2, to get the molecular formula. Thus the molecular mass of acetic acid will be     C[tex]_2[/tex]H[tex]_4[/tex]O[tex]_2[/tex]

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1. The answer to the statement above" Is this system at equilibrium " is yes as the reaction rate for both forward and reverse reaction are all equal.

It follows that from the reactions above, the concentration of A above is 1.5M and that of B is also 1.5, the resultant concentration is still 1.5M. This implies that the concentration of the A and B are constant throughout in the equilibrium reaction.

The major reason why the concentrations of B and that of A are the same is simply because both the forward and backward reactions are the same in all areas.

The major significance of equilibrium reactions is that it helps us to understand the direction of chemical reaction

So therefore, we can now confirm from the explanation above that a system is said to be at equilibrium when there is no change in the amounts or concentration of the reactants and products.

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The reaction has a low activation energy and mostly of the reactants are converted into products hence the reaction tends to occur in the forward direction

2) The rate of the reverse reaction is too small compared to  the rate of the forward reaction.

The term reaction has to do with the interaction that occurs between the reactants and the products. Thus as the reactants interacts, a new substance is formed and then we have new substances and they are called  the products. Looking at the reaction as it is written in question (1), we can see that the there is a complete and total interaction that occurs as all the reactants are converted into products. Given the fact that all the reactants are converted into products, the reactions can only proceed forward.

In this reaction, we can see from the equation that the reaction is reversible. This means that the reaction is able to occur in both directions; forward and backwards. This reactions proceeds mostly forward hence the rate of reverse reaction is infinitesimal compared to the rate of the forward reaction.

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we need these set of reactions that goes from ammonia to nitric acid.

1) 4NH3(g)+5O2(g)-->4NO(g)+6H2O(g)

2) 2NO(g)+O2(g)-->2NO2(g)

3) 3NO2(g)+H2O(l)-->2HNO3(aq)+NO(g)

State the ratio of moles of HNO3 to NH3:

4 moles of NH3 produce 4 moles of NO,

4 moles of NO produce 4 moles of NO2

4 moles of NO2 produce 4 * (2 / 3) moles of HNO3 = 8/3 moles of HNO3.

=> (8/3) moles HNO3 : 4 moles NH3

Calculate the number of moles of HNO3 in 10000 l of 0.7500 M solution

M = n / V => n = M * V = 0.7500 M * 10000 liter = 7500 moles HNO3

Use proportions:

(8/3) moles HNO3 / 4 moles NH3 = 126 moles HNO3 / x

=> x = 7500 moles HNO3 * 4 moles NH3 / (8/3 moles HNO3) = 11279 moles NH3

Convert moles to grams:

molar mass NH3 = 14 g/mol + 3 * 1g/mol = 17 g/mol

mass in grams = number of moles * molar mass = 11279 moles * 17 g/mol = 191743  g

Answer: 191743 g.

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Answers:

Aluminium Iodide

(AlI³)

Answer:

Answer 1/6

Explanation:

The ideal distance between a doorknob and the the ground floor is 34 inches.

In a lay man language, a doorknob simply refers to the handle which is usually used to hold doors in order to open or close the door. Every door of a building regardless of its size or location in the building must have a knob to always hold it with .

However, from the task given above, a doorknob should be at least 34 inches from the floor under normal circumstances.

In conclusion, it can be deduced from the simple explanation above that a doorknob should be ideally 34 inches from the floor of the house or building.

Complete question:

What should be the ideal distance between the doorknob from the floor?

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The volume of the air collected at the pressure of 150 atm is 13.33 litres.

The ideal gas equation says,

The pressure P, the volume V, the number of moles n, the gas constant R and the temperature t of the gas are related with each other as,

PV = nRT

If the number of moles and the temperature are constant,

PV = Constant

So, we can write,

P₁V₁ = P₂V₂

P₁ is the pressure of the scuba tank is 1 atm and the volume V₁ of the scuba tank is 2000L while P₂ is pressure of the other tank is 150 atm. Hence we can write,

2000 x 1 = V₂ x 150

V₂ = 13.33 Liters.

So, the volume of the air is 13.33 litres

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Ground state electron configuration of bohrium is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f¹⁴ 6d⁵ 7s². Atomic number of Bohrium is 107.

Elements are composed of identical atom, they cannot be distinguished from one another and are inseparable. In the entire periodic table , 118 elements have been know till the present.

Every electron in an atom has its position in the orbital system described by a set of four quantum numbers. The electron configuration uses this set of quantum numbers, to describe the distribution of an electrons present in a certain atom. For a neutral (uncharged) atom in the ground (non-excited) state, its configuration can be readily predicted from the row (period) and column (group) position of its element in the periodic table.

Bohrium is a element of group 7, period 7 and part of 'd' block.

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The partial pressure of N₂ = 0.158 atm

The partial pressure of H₂ = 3.6 atm

The partial pressure of NH₃ = 0.22 atm

Mass of N2₂ = 4.97 g

Molar mass of N₂ = 28 g/mol

Mass of H₂ = 8.80 g

Molar mass of H₂ = 2 g/mol

Mass of NH₃ = 4.2 g

Molar mass of NH₃ = 17 g/mol

Total pressure (Pt) = 3.97 atm

Partial pressure of N₂ = ?

Partial pressure of H₂ = ?

Partial pressure of NH₃ = ?

First, we will find out the number of moles of each component

    Number of moles = mass / molar mass

    Number of moles of N₂ = 4.97 g / 28 g/mol

    Number of moles of N₂ = 0.1775 mol

    Number of moles of H₂ = 8.08 g / 2 g/mol

    Number of moles of H₂ = 4.04 mol

    Number of moles of NH₃ = 4.22 g / 17 g/mol

    Number of moles of NH₃ = 0.2482 mol

Total number of moles = 0.1775 mol + 4.04 mol + 0.2482 mol

Total number of moles = 4.4657 mol

Now find out the partial pressure for each component

partial pressure = number of moles of each / total number of moles × total pressure

    partial pressure of N₂ = (0.1775 mol / 4.4657 mol) 3.97 atm

    partial pressure of N₂ = (0.0397 mol) 3.97 atm

    partial pressure of N₂ =  0.158 atm

    partial pressure of H₂ = (4.04 mol / 4.4657 mol) 3.97 atm

    partial pressure of H₂ = (0.9047 mol) 3.97 atm

    partial pressure of H₂ = 3.6 atm

    partial pressure of NH₃ = (0.2482 mol / 4.4657 mol) 3.97 atm

    partial pressure of NH₃ = (0.0556 mol) 3.97 atm

    partial pressure of NH₃ = 0.22 atm

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He needs to put some pancreatic blood in a test tube to test for the functioning of digestion enzymes produced by the pancreas.

The objective of this experiment is to identify the substrates and substances.

An enzyme is a substance that acts as a catalyst to speed up a biochemical process. They also help in to speed up the digestion process.

The main the purpose of this experiment is to check why these enzymes aren't working properly. A pancreatic blood test needs to be done in a test tube to find out the reasons.

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Answer:Anaxonic Neurons

Explanation:

The shore of Lake Assal in Djibouti is the lowest point on land in Africa. This point is 153 meters below sea level. Using equations 10.3 and 10.4, the temperature required to boil water on the shore of Lake Assal would be 82.6 degrees.

Sea level is described as an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured.

Sea level rise is as a result of two primary factors related to global warming:

We are going to use the formula that says "Fahrenheit is equal to 9/6 times C plus 32.

where c = 32

Fahrenheit  = 9/6 * 28.1 + 32

Fahrenheit = 82.6 degrees.

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If the dehydration reaction of an alcohol is successful, the disappearance of an O-H and C-O band from the starting material.

Distinct varieties of alcohols may also dehydrate through a slightly specific mechanism pathway. However, the general idea in the back of every dehydration reaction is that the –OH organization inside the alcohol donates two electrons to H+ from the acid reagent, forming an alkyloxonium ion.

Alcohol dehydration via elimination of water is imperative to a chain of functional group interconversions which have been proposed as a reaction pathway that connects hydrocarbons and carboxylic acids underneath geochemically applicable hydrothermal conditions including in sedimentary basins.

During dehydration synthesis, either the hydrogen of one monomer combines with the hydroxyl group of some other monomer freeing a molecule of water, or two hydrogens from one monomer integrate with one oxygen from the other monomer freeing a molecule of water.

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Answer:  The alkali metals will lose an electron to resemble the next lowest noble gas; thus, all the alkali metals form +1 ions. K loses an electron so that it will have the same electron configuration as Ne.

1A or group 1

Hope this helps! Have a good day!

The electron configuration of alkali metals would then resemble those of group 17 of the periodic table in the compounds they form.

Periodic table is defined as a tabular approach of showing the items so that they appear in the same vertical column or group when their attributes are similar. Phosphorus is the oldest chemical element, and hassium is the newest. Please take note that, unlike in the Periodic system, the elements do not exhibit their natural relationships with one another.

The elements that make up group 17 of the periodic table are the halogens. They are nonmetals that are reactive, such as iodine, bromine, chlorine, and fluorine. Halogens are non-metals that are very reactive. These substances share a lot of characteristics with one another.

Thus, the electron configuration of alkali metals would then resemble those of group 17 of the periodic table in the compounds they form.

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