Which pair of elements has the most similar Lewis structures?


N and S


N and P


F and Ne


F and Ar

Answer:

1)The molar mass of an atom is simply the mass of one mole of identical atoms. However, most of the chemical elements are found on earth not as one isotope but as a mixture of isotopes, so the atoms of one element do not all have the same mass.

2)Equally important is the fact that one mole of a substance has a mass in grams numerically equal to the formula weight of that substance. Thus, one mole of an element has a mass in grams equal to the atomic weight of that element and contains 6.02 X 1023 atoms of the element.

Answer:all thing will be moving around

Answer:

reaction to cold pack: change in temperature

Evidence of a chemical reaction etc is change in composition

Explanation: composition is atoms changeing and etc, which is a chemical reacton i think. Change in temperture is alsoa  chemical reaction but cold packs

Answer:

Cold pack: absorbs heat (endothermic reaction)

Hot pack: releases heat ( exothermic reaction)

Explanation:

when a cold pack/hot pack is shaken, water mixes with the chemicals in the outer layer and reacts to release or absorb heat.

The correct matches are:

(i) Acid chlorides and esters experience primarily dipole-dipole interactions between their molecules.

(ii) 1º and 2º amides experience primarily hydrogen bonding between their molecules.

(iii) Acid chlorides, esters, and 3º amides have lower boiling points than other carboxylic acid derivatives of similar size and shape.

(iv) 1º and 2º amides have the highest boiling points among other carboxylic acid derivatives of similar size and shape.

i.

Acid chlorides and esters experience primarily dipole-dipole interactions between their molecules due to the presence of polar bonds within the molecules.

ii.

1º and 2º amides experience primarily hydrogen bonding between their molecules, as they contain the necessary hydrogen and oxygen or nitrogen atoms for hydrogen bonding.

iii.

Acid chlorides, esters, and 3º amides have lower boiling points than other carboxylic acid derivatives of similar size and shape. This is due to the absence of hydrogen bonding in these compounds, resulting in weaker intermolecular forces.

iv.

1º and 2º amides have the highest boiling points among other carboxylic acid derivatives of similar size and shape. This is because they can form extensive hydrogen bonding between their molecules, leading to stronger intermolecular forces and higher boiling points.

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The correct answer is MgH2.

In most cases, a metal reacting with a non-metal results in the formation of ionic compounds. As is common knowledge, metals always contain extra electrons on their outermost shells while non-metals never do. Metals thus transfer their electrons to non-metals, allowing both to reach the required octave.

Mg, a metal, contains two electrons in its outermost valence shell (E.C-2, 8, 2), while hydrogen, a gas, only has one electron in its outermost shell in the compound MgH2 (E.C- 1). As a result, Mg receives two electrons, achieving its stable state and satisfying the octet rule. On the other side, hydrogen gets one electron per atom, achieving the electrical structure of helium and becoming stable.

MgH2 is an ionic compound as a result.

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Answer:

Yes.

The nuclear equation {226/88 Ra → 222/26 Rn + 4/2 He} is balanced. As we know that an alpha particle is identical to a helium atom. This implies that if an alpha particle is eliminated from an atom's nucleus, an atomic number of 2 and a mass number of 4 is lost.

Therefore, the equation will be reduced to:

226 - 4 = 222

88 - 2 = 86

Hence, the equation is balanced.

Explanation:

Answer:

yes

Explanation:

s]imple yes

Answer:

Sulfur?

Explanation:

Sulfur has 6 valence electrons and does not have luster.

The statement that is NOT correct is D) In the lead (Pb) car battery, the chemistry involves lead in the 0, +3 and +5 oxidation states.

The correct oxidation states for lead in a lead-acid battery are 0 and +4, not +3 or +5. The negative electrode (the anode) is made of lead, and it undergoes oxidation to form lead sulfate (PbSO4) and release electrons. The positive electrode (the cathode) is made of lead dioxide (PbO2), and it undergoes reduction to form lead sulfate (PbSO4) and consume electrons. The electrolyte is a solution of sulfuric acid (H2SO4), which facilitates the movement of ions between the electrodes. The other statements are correct. A standard AA-sized battery is a Galvanic cell, which converts chemical energy into electrical energy. When a rechargeable battery is being charged, the setup is that of an electrolytic cell, which uses electrical energy to drive a non-spontaneous chemical reaction. In the rechargeable battery, the electrode which is the cathode during discharge becomes the anode during charging. In the \(H2/O2\) fuel cell, the overall cell reaction is: 2 \(H2(g) + O2(g) → 2 H2O,\)  which produces electrical energy from the reaction of hydrogen and oxygen.

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There are 16 rearrangements of abcd that no two adjacent letters are also adjacent letters in the alphabet.

We need to find out the number of rearrangements of abcd such that no two adjacent letters are also adjacent letters in the alphabet.

The number of ways in which we can arrange 4 letters is given by 4! = 24.

Let's consider the case where the first letter is 'a'. The second letter cannot be 'b' as it is adjacent to 'a' in the alphabet.

The second letter can be either 'c' or 'd'. This gives us 2 options. The third letter cannot be 'b' or 'd' as they are adjacent to 'c' in the alphabet.

The third letter can be either 'a' or 'c'. This gives us 2 options. The last letter will then be the remaining letter, giving us only one option.

Therefore, there are 2*2*1 = 4 ways to arrange the letters if the first letter is 'a'.

We can repeat this process for the cases where the first letter is 'b', 'c', or 'd'.

This gives us a total of 4*4 = 16 rearrangements where no two adjacent letters are also adjacent letters in the alphabet. Therefore, the answer is 16.

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The presence of a contaminant gas would increase the measured mass of the gas sample.

The calculated molecular weight of the unknown gas would be artificially decreased due to the presence of a lighter contaminant gas.

If the sample of the unknown gas was contaminated with another gas of lower molecular weight, it would affect the measurements and the calculated molecular weight in the following ways:

Measurements: The presence of the contaminant gas would increase the overall mass of the collected gas mixture. Since the mass measurements are based on the difference between the initial and final masses, the measured mass of the unknown gas would be higher than if it were pure. This is because the contaminant gas adds to the mass measured during the experiment.

Calculated Molecular Weight: The presence of the contaminant gas would affect the calculated molecular weight of the unknown gas. Since the molecular weight of the contaminant gas is lower than that of the unknown gas, it would artificially decrease the calculated molecular weight of the unknown gas.

This is because the calculated molecular weight is derived from the ratio of the measured mass to the number of moles, and the presence of the lighter contaminant gas would result in a lower number of moles being calculated.

Hence, the presence of a contaminant gas in the unknown gas sample would lead to an overestimation of the mass and an underestimation of the molecular weight of the unknown gas in the experimental calculations.

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Here is the complete question:

Three separate samples of an unknown gas were bubbled through water and collected in a closed container of variable volume. The masses of the gas samples were determined by measuring the mass of the flask containing the pure gas before and after each introduction of gas into the water/sealed container apparatus. Given that the atmospheric pressure was 756.5mmHg throughout, and the vapor pressure of water at the experimental temperature was 22.0mmHg, calculate the molecular weight of the unknown gas:

                              Trial 1                           Trial 2                    Trial 3

Temperature (*C) 24.5                            23.8                     23.8

Initial Mass      12.4510 g                           12.3585 g               12.2802 g

Final Mass          12.3585 g                        12.2802 g          12.1708 g

Volume Collected 40.15 mL                           33.62 mL           45.34 mL

Suppose the sample of the unknown gas was, in fact, not pure, but instead was contaminated with another gas whose molecular weight was lower than that of the unknown. How would this affect the measurements? How would it affect the calculated molecular weight?

Answer:

29

Explanation:

since protons are a constant and unique characteristic of an element it's considered as he atomic number of that element.

The equation for this reaction is

\(\text{Mg}+\text{O} \longrightarrow \text{MgO}\)

This means that for every mole of magnesium consumed, 1 mole of magnesium oxide is produced.

So, the answer is 0.094 moles.

Answer:

4834.20 ml or 4.8342 L

Explanation:

Gold has density of 19.30 g/ml

so according to d = m/V

V = m/d = 93,300/19.30 = 4834.19689119 = 4834.20 ml or 4.8342 L

The volume of nuggets of gold that has a mass of 93,300g is 4834.20 ml or 4.8342 L.

Volume is the space occupied by a three-dimensional object.

Density is the mass per unit volume. Density is a scalar quantity. It is denoted by d and the symbol for density is given as rho, a Greek symbol. Density is calculated as mass divided by volume.

Density is directly proportional to mass and inversely proportional to volume. Thus, with an increase in density, mass increases and volume decreases, and vice-versa

Gold has a density of 19.30 g/ml

so according to density = mass/ volume

V = m/d = 93,300 / 19.30 = 4834.19

4834.20 ml or 4.8342 L

Therefore, the volume of nuggets of gold that has a mass of 93,300g is 4834.20 ml or 4.8342 L.

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Rhenium (Re) has two stable isotopes, 185Re and 187Re. The average atomic mass of Rhenium is 186.2 amu.

The mole percent of 185Re in Rhenium can be calculated as follows:

Mole percent of 185Re = (number of moles of 185Re/total number of moles of Rhenium) × 100

To find the number of moles of 185Re, we need to know the fractional abundance of 185Re, which can be calculated as follows:

Fractional abundance of 185Re = mass percent of 185Re/atomic mass of Rhenium

Fractional abundance of 185Re = (185/186.2) × 100 = 99.35%

The mass percent of 185Re is 185 because it is the mass number of the isotope that we are interested in.

Since the atomic mass of Rhenium is the weighted average of the masses of the two isotopes,

we can assume that the mass percent of 187Re is (100 - 99.35) = 0.65%.

Now we can find the number of moles of each isotope in 100 g of Rhenium.

Number of moles of 185Re = (0.9935 × 100 g)/185 g mol⁻¹ = 0.53649 mol

Number of moles of 187Re = (0.0065 × 100 g)/187 g mol⁻¹ = 0.00034 mol

Total number of moles of Rhenium = 0.53649 + 0.00034 = 0.53683 mol

Therefore, the mole percent of 185Re in Rhenium is:(0.53649/0.53683) × 100 = 99.94% ≈ 100%

So the answer is: (b) 50%.

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The predominant intermolecular force found in Na⁺ (aq) is Ion-Dipole Interactions.

Intermolecular forces can be defined as the attractive or repulsive forces that produce between the molecules or ions of a solution or substance. These forces are responsible for the physical properties and chemical properties of matter.

Forces that develop between the molecules themselves are intermolecular forces.  The intermolecular forces are Ion-Dipole Interactions, Dipole-Dipole Interactions, Ion-Induced Dipole Interactions, Dispersion Forces, and Dipole-Induced Dipole Interaction.

In the Na⁺ aqueous solution, sodium Na⁺ ions interact with the dipole of water molecules therefore, the predominant intermolecular forces in such solution are Ion-Dipole Interactions.

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3rd statement about this acidic reaction is not true

In acidic reactions,  Litmus paper is available in red and blue varieties and is typically more trustworthy. To determine whether a solution is normal or acidic, use litmus paper. The acid or basic strength is not precisely outlined in Litmus's paper. Thus, Base causes red litmus to turn blue.

The pH scale has numbers 0 through 14. Seven is the neutral pH. Over 7 is a base, and anything below 7 is acidic.

H+ ions are present in all acidic reactions. As a result, whether mineral or organic, all acid solutions transmit electricity. They allow an electric current to flow through them.

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Answer:

Describes its potential to undergo some chemical change or reaction by virtue of its composition

Answer:

3.97 M

Explanation:

Given data:

Initial volume V₁  = 318 mL

Initial molarity M₁ = 5.75 M

New volume V₂=  461 mL

New concentration M₂= ?

Solution:

New volume V₂= 143 mL+ 318 mL

New volume V₂= 461 mL

Formula:

M₁V₁  = M₂V₂

M₂ = M₁V₁ / V₂

M₂ = 5.75 M × 318 mL / 461 mL

M₂ = 1828.5 M. mL/ 461 mL

M₂ = 3.97 M

Answer:

Obtain the relative numbers of atoms of each element in the compound by dividing the number of moles of each element in the 100 g sample by the number of moles of the element present in the smallest amount.

Answer:

Obtain the relative numbers of atoms of each element in the compound by dividing the number of moles of each element in the 100 g sample by the number of moles of the element present in the smallest amount.

The millimolar concentration of ethanol in the bloodstream of a person with a blood alcohol content of 0.08% w/v is 17.4 mM.

What is the blood alcohol content?

Blood alcohol content (BAC) is a measure of the concentration of alcohol in a person's bloodstream. It is typically expressed as a percentage, either as weight/volume (w/v) or as volume/volume (v/v).

BAC is affected by various factors such as the amount of alcohol consumed, the rate of alcohol metabolism, body weight, gender, and other individual characteristics.

To calculate the millimolar concentration of ethanol in the bloodstream, we first need to convert the blood alcohol content (BAC) from weight/volume percentage to molarity.

Convert the blood alcohol content (BAC) from weight/volume percentage to grams of ethanol per liter of blood:

BAC = 0.08%

w/v =\(\frac{ 0.08 g}{100 mL}\)

= 0.8 g/L

Calculate the molarity (M) of ethanol:

Molarity (M) = \(\frac{mass\ of \solute\ in\ grams}{molar&mass of solute\ in\ g/mol \ or\ volume\ of solution\ in \liters}\)

We know the molar mass (Mw) of ethanol is 46 g/mol, and the BAC is 0.8 g/L:

Molarity (M) = \(\frac{0.8 g/L}{46 g/mol}\)

= 0.0174 mol/L

Convert molarity to millimolar concentration:

Millimolar concentration = Molarity (M) × 1000 Millimolar concentration

= 0.0174 mol/L × 1000

= 17.4 mM

Therefore, the millimolar concentration of ethanol in the bloodstream of a person with a blood alcohol content of 0.08% w/v is 17.4 mM.

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Answer:

Fossil fuels and biomass combustion.

Explanation:

The mass combustion of fossil fuels and biomass results in the vast release of Black Carbon (BC) and Brown Carbon (BrC) and dust. These Black Carbon, light absorbing organic Brown Carbon and dust cause the discolouring and yellowing of the surface of Taj Mahal building.

Answer:

Acid rain causes discoloring Taj Mahal

Explanation:

When both parents shared different traits either it will be heterogeneous or homogenous traits,in that case offspring traits neither belongs to parents.However,chances are very that traits of children neither belongs to parents.

Unaffected parents can create impacted offsprings assuming that the two guardians are transporters (heterozygous) for the attribute being followed in the family. Latent traits are normally not communicated in each age. Finally, guys and females are similarly prone to communicate a latently acquired characteristic.

In the event that the latent characteristic is more than prevailing, the recessive traits will really become predominant and the predominant attribute will become recessive.Recessive alleles are meant by a lowercase letter (a versus A). Just people with an aa genotype will communicate a latent characteristic; consequently, posterity should get one passive allele from each parent to display a latent traits.

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Answer:

??????????..........

Based on the hypothesis test, the p-value for each sample result is not provided. However, we can determine the value of the test statistic and draw conclusions based on that.

In hypothesis testing, the p-value represents the probability of obtaining a sample result as extreme as or more extreme than the observed data, assuming the null hypothesis (H0) is true. If the p-value is less than the significance level (α), we reject the null hypothesis in favor of the alternative hypothesis (Ha); otherwise, we fail to reject the null hypothesis.

For sample result (a) with x = 44 and s = 5.3, we need to find the test statistic. The formula for the test statistic is:

t = (x - μ) / (s / √n),

where x is the sample mean, μ is the hypothesized population mean, s is the sample standard deviation, and n is the sample size. Plugging in the given values, we have:

t = (44 - 45) / (5.3 / √36) = -1.132.

To find the p-value, we look up the test statistic in the t-distribution table or use statistical software. Since the p-value is not provided, we cannot determine the conclusion for this specific sample result.

For sample result (b) with x = 43 and s = 4.5, we can follow the same steps as above to find the test statistic. Plugging in the given values, we have:

t = (43 - 45) / (4.5 / √36) = -2.667.

Again, without the p-value, we cannot determine the conclusion for this sample result.

Finally, for sample result (c) with x= 46 and s = 6.0, we calculate the test statistic:

t = (46 - 45) / (6.0 / √36) = 1.000.

Without the p-value, we cannot draw a conclusion for this sample result.

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Answer:

this option is the correct they move to an area with lower oxygen concentration because gas molecules can pass through semi-permeable and do not need transport proteins for the movement

Explanation:

i hope this will help you

can confirm that

They move to an area with a lower oxygen concentration

if the correct answer :)))

Explanation:

ape-x

Answer:

CH4

Explanation:

Hydrocarbons are composed of hydrogen and carbon only.

CH4 is a formula for a hydrocarbon. Hence option a is correct.

Chemical formula is defined as a technique of expressing the chemical ratios of atoms that make up a certain chemical compound or molecule using chemical element numbers and symbols. The components of a compound's molecules are identified in its chemical formula, as well as the ratio in which the components' atoms mix to form those molecules.

A hydrocarbon is any of a group of organic compounds comprised only of the atoms carbon (C) and hydrogen (H). The structure of the complex is built up of carbon atoms, and hydrogen atoms attach to that framework in a variety of ways. chemical substance Study up on chemical substances.

Thus, CH4 is a formula for a hydrocarbon. Hence option a is correct.

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Answer:same direction

Explanation:

Let's see that the first compound represents an oxide which is a combination resulting from the union of a metallic or nonmetallic element with oxygen. To name an oxide, you have to write "___ oxide", where the line is the name of the element. In this case, lithium is the element that is bonded with oxygen, so its name is lithium oxide.

The second compound that you can recognize as water, is an oxide too. So its name is also hydrogen oxide.