Which of the following does not describe a characteristic of carbon?
A.) It is non-metallic
B.) It has four valence electrons
C.) It has an electron configuration of 1s2s2p2
D.) It forms bonds only, with itself and not other atoms.

Answer: Amount of heat required to vaporize 84.8 g of water is 191.7kJ.

Explanation: We are given 84.8 grams of water, to convert it into moles, we use the formula:

[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

Molar mass of water = 18 g/mol

[tex]Moles=\frac{84.8g}{18g/mol}=4.71moles[/tex]

As we know that [tex]\Delta H_{vap}[/tex] for 1 mole of water at 100° C is 40.7 kJ/mol

So, to calculate the amount of heat required, we use the formula:

[tex]q=m\Delta H_{vap}[/tex]

Putting the values in above equation, we get

[tex]q=4.71mol\times 40.7kJ/mol[/tex]

q = 191.7kJ

Answer:

Molaridad = número de lunares de soluto/Kg de disolvente

La molaridad se da en el problema como 0,175 m

Masa de disolvente = 347 gm = 0,347 Kg

por lo tanto

0.175 = número de lunares de LiBr / 0.347

número de lunares de LiBr = 0,175 x 0,347 = 0,060725 lunares

Explanation:

Final answer:

The compound being a liquid at room temperature, dissolving in water, and the resulting solution being weakly conducting indeed suggests it is a polar molecular compound. This is because its behavior aligns with polar molecular compounds' typical properties, such as solubility in water and poor conductivity compared to ionic solutions.

Explanation:

The statement that a compound is a liquid at room temperature, dissolves in water, and the resulting solution is weakly conducting, indicating that the compound is polar molecular, is true. This can be understood by considering the basic properties of molecular and ionic compounds. Molecular compounds, which are composed of molecules formed by covalent bonds, can be polar if they have an uneven distribution of electron charge. When such a polar molecular compound dissolves in water, which itself is a polar solvent, it can interact with water molecules through hydrogen bonding or dipole-dipole interactions. This explains the solubility of the compound in water.

However, the weak conductivity of the solution suggests that it does not contain free ions in large amounts, as would be expected from an ionic compound dissolved in water. Instead, the slight conductivity can be attributed to a small degree of ionization or the presence of polar molecules that are not completely non-conductive but are far less efficient in conducting electricity than ions. Therefore, considering the compound's liquid state at room temperature, its solubility in water, and its weak electrical conductivity in solution, it aligns well with the characteristics of a polar molecular compound rather than an ionic compound.

Final answer:

Rutherford's expected outcome of the gold-foil experiment was for the alpha particles to pass through the foil un-deflected, but the actual outcome showed scattering of the particles at large angles. This discovery challenged the plum pudding model of the atom and led to the development of the nuclear model.

Explanation:

Rutherford's expected outcome of the gold-foil experiment was that the alpha particles would pass through the gold foil un-deflected, similar to bullets passing through a Styrofoam sheet. However, the actual outcome of the experiment showed that while most of the alpha particles did pass through the foil without deflection, some were scattered at large angles and a few even came back in the direction they came from.

This result, known as Rutherford scattering, indicated that the gold nuclei were actually very small compared to the size of the gold atom. It suggested the presence of a small, dense, positively-charged nucleus at the center of the atom. This discovery challenged the plum pudding model of the atom and led to the development of the nuclear model of the atom.

Charles’s law, Avogadro’s law, and Boyle’s law can be combined to form the ideal gas law.

Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.

Mathematically, it can be stated as,

P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.

According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,

P₁V₁=P₂V₂

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Answer: The chemical equation is;

[tex]PbS(s)+2HCl(aq)\rightarrow PbCl_2(s)+H_2S(g)[/tex]

Explanation:

The described reaction between solid lead sulfide and aqueous hydrochloric acid can represented in the in the form of chemical equation as given below:

[tex]PbS(s)+2HCl(aq)\rightarrow PbCl_2(s)+H_2S(g)[/tex]

1 mol of lead(ii) sulfide reacts with hydrochloric acid to give 1 mole of lead chloride and hydrogen sulfide gas.

The balanced chemical equation is: PbS(s) + 2 HCl(aq) -> PbCl2(s) + H2S(g)

The balanced chemical equation for the reaction between solid lead(II) sulfide and aqueous hydrochloric acid is:

PbS(s) + 2 HCl(aq) -> PbCl2(s) + H2S(g)

In this reaction, solid lead(II) sulfide reacts with hydrochloric acid to produce solid lead(II) chloride and dihydrogen sulfide gas. The phases in the equation are represented by 's' for solid, 'aq' for aqueous, and 'g' for gas.

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The function of cell membrane is to  protect the cell from its surroundings by controlling the movement of substances in and out of the cells.

The cell membrane, provides protection for a cell. It also provides a fixed environment inside the cell, and that membrane has several different functions. One is to transport nutrients into the cell and also to transport toxic substances out of the cell. Another is that the membrane of the cell, which would be the plasma membrane, will have proteins on it which interact with other cells.

Those proteins can be glycoproteins, meaning there's a sugar and a protein moiety, or they could be lipid proteins, meaning that there's a fat and a protein. And those proteins which stick outside of the plasma membrane will allow for one cell to interact with another cell. The cell membrane also provides some structural support for a cell.

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Alkanes from highest to lowest boiling points:

Alkanes are saturated hydrocarbons with all carbon bonds being single bonds

General formula:

[tex]\large{\boxed {\bold {C_nH_{2n + 2}}}[/tex]

There are several rules for naming alkanes from IUPAC:

In determining the alkane boiling point, if in the same homologous series, then just look for alkanes with the largest relative molecular mass that will have a large boiling point too. So in an alkane in the form of a straight-chain, the more carbon atoms, the longer the main chain, the bigger the boiling point.

But if the relative molecular mass is the same, the alkanes have fewer branches will have a greater boiling point.

The more branches, the lower the boiling point, even though the number of carbon atoms is the same (as in isomers)

In isomers that have the same molecular formula and relative molecular mass, alkanes that have the fewest branches will have the largest boiling point.

So that the general determination of the alkane boiling point is (based on its priority)

the greater the higher the boiling point

the fewer branches the higher the boiling point

The branching on the main chain in the alkane structure causes the attraction between the molecules to be lower so that to release this attractive force only requires low energy, ie at low temperatures

The relative molecular mass of each alkane in the above problem is:

The relative molecular mass values ​​above indicate that there are similarities in the relative molecular mass values ​​of heptane and 3.3 dimethyl pentane. But because the unbranched chain has a higher boiling point so heptane has a greater boiling point than 3.3 dimethyl pentane

the name of this hydrocarbon

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 the correct name of the compound

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type of organic compound contains the following functional group

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Keywords: alkanes, main chains, branches, boiling points, relative molecular mass

There are many compounds in organic chemistry containing carbonyl group as the part of their structure.

First kind of compounds with carbonyl group are carbonyl compounds (aldehyde with R-CHO and ketone, RCOR' as their structural formula)

Next, Carboxylic acid and their derivatives

Carboxylic acid: RCOOH

Ester: RCOOR'

Acid chloride: RCOCl

Anhydride: (RCO)2O

Amide: RCONH2

And carbohydrates, amino acids also have Carbonyl group in their structures.

Structure of carbonyl group: -C=O

Answer : All the statements are true.

Explanation :

Viscosity : It measures the resistance of a liquid to flow is known as the viscosity.

There are many factors affects the viscosity which are temperature, pressure, molecular weight and inter-molecular forces.

There is an inverse relationship between the viscosity and the temperature. As the temperature decreases, viscosity increases and the temperature increases, viscosity decrease.

There is a direct relationship between the viscosity and the pressure. As the pressure decreases, viscosity decreases and the pressure increases, viscosity increases.

There is a direct relationship between the viscosity and the molecular weight. As the molecular weight decreases, viscosity decreases and the molecular weight increases, viscosity increases.

There is a direct relationship between the viscosity and the inter-molecular force. As the inter-molecular force decreases, viscosity decreases and the inter-molecular force increases, viscosity increases.

Hence, all the statements are true.

Statements about viscosity are true:

(i) viscosity increases as temperature decreases.

(ii) viscosity increases as molecular weight increases.

(iii) viscosity increases as intermolecular forces increase

Viscosity is a measure of a fluid's resistance to flow. A viscous fluid flows slowly, while a non-viscous fluid flows quickly.

(i) Temperature affects viscosity because it affects the kinetic energy of the molecules in a fluid. As temperature decreases, the kinetic energy of the molecules decreases. This means that the molecules move more slowly, and the fluid becomes more viscous.

(ii) Molecular weight affects viscosity because it affects the strength of the intermolecular forces between the molecules in a fluid. As molecular weight increases, the intermolecular forces become stronger. This means that it is more difficult for the molecules to move past each other, and the fluid becomes more viscous.

(iii) Intermolecular forces affect viscosity because they are the forces that hold the molecules in a fluid together. As intermolecular forces increase, the molecules are held more tightly together. This means that it is more difficult for the molecules to move past each other, and the fluid becomes more viscous.

Therefore, all three statements about viscosity are true.

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On Ed. the exact answer is 0.0066.

According to the concept of solubility and lipids being hydrophobic they are insoluble in water and hence would float on water.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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Answer:

Liquid a has a lower boiling point than liquid  b.

Explanation:

Hello,

In this case, volatility is associated with three factors:

1. Vapor pressure: this is the pressure exerted by the gas molecules in equilibrium with the liquid. The higher the vapor pressure, the higher the volatility.

2. Intermolecular forces: are the interactions attracting or repelling the material's molecules. The stronger the forces, the lower the volatility as the molecules remain strongly closer.

3. Boiling point: is the condition of both temperature and pressure at which a liquid passes from liquid to gas. The lower the boiling point, the higher the volatility as more molecules easily pass from liquid to gas.

In such a way since liquid a is more volatile than liquid b, the answer is liquid a has a lower boiling point than liquid  b based on the aforesaid factors.

Best regards.

Answer:

ClCO2

Explanation:

The sequences of the geological happenings in the periodical order is called the geological time's scale. The card of the third row depicts the first flowering plant.

Events of the evolution can be explained based on the geological timelines and are arranged on the basis of their discoveries. In the question, the order of the events is arranged from the earliest to the newest.

The earliest event was the appearance of life in the sea followed by the rock formation. The third event was the appearance of the flowering plant on the land followed by land animals.

Therefore, the third card depicts the flowering land plant.

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Answer: The correct answer is option B.

Explanation:

Average kinetic energy of the gas molecule is given by relation:

[tex]E_K=\frac{3}{2}\frac{R}{N_A}\times T[/tex]

[tex]N_A[/tex] = Avogadro Number

T = Temperature of the gas in Kelvins.

R = Universal gas constant

[tex]E_K\propto T[/tex]

With increase in temperature the kinetic energy of the gas molecule increases and vice-versa.

So, according to the question the explanation for a drop in temperature of the gas is decrease in average kinetic energy of the gas molecules.

Hence, the correct answer is option B.

Ice has the largest volume, followed by liquid water, and then water vapor.

Water is one of the few substances on Earth that exists naturally in all three states: solid (ice), liquid (water), and gas (water vapor). The density of each state of water varies, with the vapor state being the least dense and the liquid state being the most dense. The solid state, which is ice, is less dense than the liquid state. So, in terms of volume, the ice sample will have the largest volume, followed by the liquid water sample, and then the water vapor sample, which will have the smallest volume.