What elegant has 2 valence electrons

The average mass (atomic mass) of element X is 23.07 amu.

Atomic mass is the average mass of atoms of an element, often expressed in atomic mass units (amu). The atomic mass of element X is found by adding the product of each isotope’s atomic mass and its natural abundance.The atomic mass is calculated by taking the weighted average of the isotopes of an element.

Thus, the atomic mass of an element is the sum of the atomic masses of its isotopes multiplied by their respective natural abundances.

An element X was composed of 93% 23X and 7% 24X. We have to find the average mass of element X, also known as its atomic mass.

How to calculate the atomic mass of an element:

Atomic mass = ∑[ (% abundance of isotope i) × (mass of isotope i) ]

where i is the number of isotopes

The atomic mass of element X can be calculated as follows:

Atomic mass of 23X = 23Atomic mass of 24X = 24Average atomic mass = [(0.93 × 23) + (0.07 × 24)] amu= (21.39 + 1.68) amu= 23.07 amu

Hence, the average mass (atomic mass) of element X is 23.07 amu.

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Answer:

See attached for answers

Explanation:

Answer:

Explanation:

cant see the screen really

Answer:(part a) Lithium and Chlorine, (part c) Potassium and Oxygen are likely to form an ionic compound.

Explanation:

brainliest please

Answer:

it contains 2.56 x 10^15.

Explanation:

given no. of moles = 4.26 x 10^-9 atoms

one mole has 6.022 x 10^23 atoms

so it contains 4.26 x 10^-9 x 6.022 x 10^23 atoms

(If we suppose silver's atomic weight as 108.)

Answer:

I think it is c

Explanation:

When water turns into water vapor it goes into the air so it must be lighter

Answer:

5

Explanation:

Option B will complete the reaction. Hence, option B is correct.

What is amine?

Amines are organic derivatives of ammonia, in which one, two, or all three of the hydrogens of ammonia are replaced by organic groups.

The complete reaction is:

\(CH_3CH_2CI+ CH_3NHCH_3\) → \(H_3C H_3C NCH_2CH_3 + HCI\)

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Answer:

It should be 28 degrees C

Explanation:

Answer:

28°C

Explanation:

Answer:

D) 14 Electrons

Explanation:

I took the test and got it right

The total number of electrons that can occupy the f sublevel is 14 electrons. Thus option D is correct.

Electrons can be defined as a negatively charged subatomic particle that together with protons and neutrons forms an atom's nucleus. It is the lightest subatomic particles.

s orbital has 2 electrons in pair

p orbital has 6 electrons in pair

d orbital has 10 electrons in pair

f orbital has 14 electrons in pair.

Thus, the total number of electrons that can occupy the f sublevel is 14 electrons. Thus option D is correct.

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Spinal cord is a  hollow tube along the back of an animal with nerves running inside or beside it is a characteristic of chordates.

A chordate  is an animal of the phylum Chordata. All chordates possess, at some point during their larval or adult stages, five synapomorphies, or primary physical characteristics, that distinguish them from all the other taxa. These five synapomorphies include a notochord, dorsal hollow nerve cord, endostyle or thyroid, pharyngeal slits,. The name “chordate” comes from the first of these synapomorphies, the notochord, which plays a significant role in chordate structure and movement. Chordates are also bilaterally symmetric, have a coelom, possess a circulatory system, and exhibit metameric segmentation.

In addition to the morphological characteristics used to define chordates, analysis of genome sequences has identified two conserved signature indels  in their proteins: cyclophilin-like protein and mitochondrial inner membrane protease ATP23, which are exclusively shared by all vertebrates, tunicates and cephalochordates. These CSIs provide molecular means to reliably distinguish chordates from all other Metazoa.

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Answer:730

Explanation:

1-bromopropane + Mg (in diethyl ether) → 1-bromopropan-2-ol (Grignard reagent)

Grignard reagent + benzaldehyde (in diethyl ether) → 1-phenylpropan-1-ol (after protonation with dilute acid)

What is Organic Product?

In organic chemistry, a product is the substance(s) formed from a chemical reaction. An organic product is a substance that is formed from a reaction that involves at least one organic compound. Organic compounds are those that contain carbon atoms bonded to hydrogen and other elements such as oxygen, nitrogen, sulfur, and halogens.

The reaction of 1-bromopropane with magnesium in diethyl ether is a Grignard reaction that forms the corresponding magnesium alkoxide as the intermediate. The addition of benzaldehyde in diethyl ether to the Grignard reagent results in a nucleophilic attack by the alkoxide on the carbonyl carbon of benzaldehyde, followed by protonation of the resulting intermediate by dilute acid. The final product is 1-phenylpropan-1-ol.

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The principal organic product is 1-phenylpropan-2-ol.

When 1-bromopropane reacts with magnesium in diethyl ether, a Grignard reagent, namely 1-magnesiobutane, is formed. This intermediate then undergoes nucleophilic attack by benzaldehyde in diethyl ether, leading to the formation of 1-phenylpropan-2-ol. The final step involves the addition of dilute acid, which serves to protonate the oxygen of the alcohol, resulting in the formation of the principal organic product, 1-phenylpropan-2-ol.

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When sand, limestone, and soda ash are mixed and melted, they result in a clear glass .

Glass is a non-crystalline material made from a combination of silicon dioxide, calcium oxide, and sodium oxide. The sand acts as the source of silica, the limestone provides calcium oxide, and the soda ash provides sodium oxide. When heated to high temperatures, the molecules of the three components bind together to form a viscous liquid. The liquid is then cooled, which causes it to solidify into a hard, transparent material. Glass is used for a variety of applications, including windows, lenses, and beverage containers.

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Answer:

Physical dependence is characterized by tolerance and withdrawal. Drug or substance dependency is psychological.

Answer:

Here's what I get  

Explanation:

(i) Voltaic cell

A voltaic cell is a device that uses a chemical reaction to produce electrical energy.

(ii) Overall Cell Potential

The standard reduction potentials for the half-reactions are

                               ℰ°/V

Cu²⁺ + 2e⁻ ⇌ Cu    0.34

Zn²⁺ + 2e⁻ ⇌ Zn   -0.76

The half-reaction with the more positive potential is the reduction half-reaction. It is the reaction that occurs at the cathode.

The half-reaction with the more negative potential is the oxidation half-reaction. It is the  reaction that occurs at the anode.

We reverse that half-reaction and subtract the voltages to get the cell reaction.

                                                          ℰ°/V

Cathode:  Cu²⁺ + 2e⁻ ⇌ Cu              0.34

Anode:     Zn ⇌ Zn²⁺ + 2e⁻              -0.76

Cell:          Zn +  Cu²⁺ ⇌ Zn²⁺ + Cu    1.10

\(\mathcal{E}_{\text{cell}}^{\circ} = \mathcal{E}_{\text{cat}}^{\circ} - \mathcal{E}_{\text{an}}^{\circ} = \text{0.34 V} - \text{(-0.76 V)} = \text{0.34 V} + \text{0.76 V} = \textbf{1.10 V}\)

(iii) Diagram

The specific labels will depend on your textbook.

They are often as follows.

a. Electron flow

b. Voltmeter or lightbulb

c. Electron flow

d. Cathode or Cu

e. Cu²⁺(aq) and NO₃⁻(aq)

f. Salt bridge

g. Zn²⁺(aq) and NO₃⁻(aq)

h. Anode or Zn

The salt bridge enables ions to flow in the internal circuit and to maintain electrical neutrality in the two compartments.

It often consists of a saturated solution of KCl.

As Zn²⁺ ions form in the anode compartment, Cl⁻ ions move in to provide partners for them.

As Cu²⁺ ions are removed from the cathode compartment, K⁺ ions move in to replace them.

Answer:a. Electron flow

b. Voltmeter or lightbulb

c. Electron flow

d. Cathode or Cu

e. Cu²⁺(aq) and NO₃⁻(aq)

f. Salt bridge

g. Zn²⁺(aq) and NO₃⁻(aq)

h. Anode or Zn

Explanation:

Answer:

Mass

Explanation:

Answer:

O low ionization energy and more than 4 valence electrons

Explanation:

please Mark as BRAINLIST answer

Elements that easily gain (steal) electrons tend to have low ionization energy and more than 4 valence electrons. Therefore, the correct option is option D.

The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count.

118 known elements are present. A study is being done to create element 120.1. The periodic table will have to modified to include element 120 after it has been created and validated. Elements that easily gain (steal) electrons tend to have low ionization energy and more than 4 valence electrons.

Therefore, the correct option is option D.

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Answer: The given statement is TRUE.

Explanation:

An equilibrium reaction is one in which rate of forward reaction is equal to the rate of backward reaction.

Equilibrium constant is defined as the ratio of the product of the concentration of products to the product of the concentration of reactants each raised to their stochiometric coefficient.

For example for the given equilibrium reaction;

\(2H_2O(g)\leftrightharpoons 2H_2(g)+O_2(g)\)

\(K_{eq}=\frac{[H_2]^2[O_2]}{[H_2O]^2}\)

Thus the given statement that in calculating the equilibrium constant for a reaction, the coefficients of the chemical equation are used as exponents for the factors in the equilibrium expression is True.

The standard free energy change for the reaction of 1.78 moles of CO(g) at 308 K, 1 atm would be -36.9 kJ. This reaction is product-favored under standard conditions at 308 K.

To calculate the standard free energy change (ΔG°) for the reaction, we can use the equation:

ΔG° = ΔH° - TΔS°

Given that ΔH°rxn = -206.1 kJ and ΔS°rxn = -214.7 J/K, we need to convert the values to kJ and adjust the sign for ΔS°:

ΔH°rxn = -206.1 kJ

ΔS°rxn = -214.7 J/K = -0.2147 kJ/K

Now we can substitute these values into the equation:

ΔG° = -206.1 kJ - (308 K)(-0.2147 kJ/K)

    = -206.1 kJ + 66.1736 kJ

    = -139.9264 kJ

Since the question asks for the standard free energy change for 1.78 moles of CO(g), we need to calculate the moles of CO(g) in the reaction:

1 mole of CO(g) reacts to form 1 mole of CH₄(g)

1.78 moles of CO(g) will react to form 1.78 moles of CH₄(g)

Therefore, the standard free energy change for the reaction of 1.78 moles of CO(g) at 308 K, 1 atm is -139.9264 kJ.

Based on the negative value of ΔG°, the reaction is product-favored under standard conditions at 308 K.

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Answer:

Hydrocarbons are the chemical compound that contain the elements carbon and hydrogen only.

They are compounds that are obtained from the fossil fuel crude oil by a process called fractional distillation.

Answer:

60.06 g/mol

The solute is urea, CO(NH2)2. Molar mass of urea: (12.01) + 16.00 + 2(14.01 + 2(1.008)) = 60.06 g/mol.

Explanation:

Answer:

60.06 g/mol

Explanation:

the solution area,CO(NH2)2.molar mass urea:

(12.01)+16.00+2(14.01+2(1.008))=60.06g/mol

If a naturally occurring sample of an unidentified element is found to contain three isotopes (A, B, and C) and consists of 90.5% isotope A (mass number 20), 0.3% isotope B (mass number 21), and 9.3% isotope C (mass number 22), the atomic weight of the element measured from the sample will be greater than 21 amu.

To calculate the average atomic mass, multiply the fraction through the mass number for every isotope, then add them together. Whenever we do mass calculations concerning elements or compounds (combos of elements), we usually use average atomic loads.

For instance, carbon-14 is a radioactive isotope of carbon that has six protons and 8 neutrons in its nucleus. We name it carbon-14 because the overall range of protons and neutrons within the nucleus also called the mass number, provides up to fourteen (6+8=14).

Together, the quantity of protons and the range of neutrons determine an detail's mass variety. Due to the fact, that an element's isotopes have barely unique mass numbers, the atomic mass is calculated by obtaining the suggested mass numbers for its isotopes.

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Answer:

it disappeared loll jk

it obviously dried

well you may Mark me as brainliest

Water is unique in that way because of its hydrogen bonds. Unlike most materials, water molecules form an orderly lattice when they freeze. Ice is less dense than water, which means that a given volume of ice has fewer molecules than the same volume of water. As a result, ice floats on water.

When water molecules lose heat, they move more slowly and are more likely to form hydrogen bonds with neighboring molecules. In a liquid, hydrogen bonds are constantly breaking and reforming as molecules move around. However, when water is cooled to 4°C, the hydrogen bonds become more stable and start to arrange themselves into a crystalline structure. The hydrogen bonds lock molecules into place, forming a lattice-like network of hexagonal rings.This crystal lattice has more empty space than liquid water, making ice less dense than water. This makes ice float, which is why ponds and lakes freeze from the top down. If ice were denser than water, it would sink, and the bottom of the pond or lake would freeze first, making it difficult for plants and animals to survive.

Water is unique in that way because of its hydrogen bonds. Unlike most materials, water molecules form an orderly lattice when they freeze. Ice is less dense than water, which means that a given volume of ice has fewer molecules than the same volume of water. As a result, ice floats on water.

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Answer:

liquid

Explanation:

A solid is defined as substance with a set volume and form. A liquid is defined as substance with a set volume but no fixed form. A gas is substance that does not have a definite volume or shape. Plasma, like a gas, has no set volume or shape.

On the pH scale, the pH range for an acid is 0–7 and the pH range for a base is 7–14. pH 7 refers to a neutral solution. pH-7 pure water is a substance considered neutral.

This substance, which consists of a water molecule with a proton (H+) added, is an ion because it has a charge. It is known as the hydronium ion and has the formula H3O+. When an acid dissolves in water, the hydronium ion is always produced. Always interacting with the nearby water molecule to generate H3O+, the acid's H+.

For the detection of trace gases in the air, chemical ionization using proton-transfer reactions with hydronium ions (H3O+) is frequently used.

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The answer is (70.35, 84.57) mL.

The three volumes of NaOH required to attain a pH of 7 in each of the three titrations are: 82.16, 75.79, and 75.43 mL. To estimate the mean number of milliliters required to neutralize 1 gram of the acid, a 99 percent confidence interval will be used. Let's calculate the sample mean, sample standard deviation, and margin of error using the provided data.

Sample standard deviation:

Sample Mean The sample mean of a dataset is defined as the sum of all the data points divided by the number of data points. So the sample mean will be: (82.16+75.79+75.43) / 3 = 77.46 mL. Sample Standard Deviation The sample standard deviation (s) is defined as the square root of the sample variance. To calculate s, we need to first compute the sample variance (s²):s² = ∑(x - μ)² / (n - 1)where x is the value of the observation, μ is the sample mean, and n is the sample size.s² = [(82.16 - 77.46)² + (75.79 - 77.46)² + (75.43 - 77.46)²] / (3 - 1)s² = [20.4 + 6.74 + 5.84] / 2s² = 16.49s = sqrt(16.49) = 4.06 mL.

Marginal Error The formula for the margin of error for a confidence interval for the mean is:

margin of error = t (α/2) * (s / sqrt(n)) where t(α/2) is the critical value of the t-distribution with n-1 degrees of freedom and a level of significance of α/2 (in this case, α/2 = 0.005).s is the sample standard deviation that we computed earlier. n is the sample size (in this case, n = 3). margin of error = t(α/2) * (s / sqrt(n))margin of error = 3.182 * (4.06 / sqrt(3)) = 7.11 mL. The margin of error is 7.11 mL. Confidence Interval The confidence interval formula for a population mean is: sample mean - margin of error < μ < sample mean + margin of error where μ is the population mean and sample mean is the value obtained from the sample.μ = 77.46 - 7.11 < μ < 77.46 + 7.11Thus, the 99% confidence interval for the mean number of milliliters needed to neutralize 1 gram of the acid is (70.35, 84.57) mL (rounded to three decimal places).Therefore, the answer is  (70.35, 84.57) mL.

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If hydrochloric acid is added to a solution of HF, it will react with the HF to form H3O+ and F- ions. This reaction is a type of acid-base reaction, where the hydrochloric acid acts as the stronger acid and donates a proton to the HF, which acts as the weaker base.

The addition of hydrochloric acid will increase the concentration of H3O+ ions in the solution. This increase in the concentration of H3O+ ions will shift the equilibrium of the HF ionization reaction to the left, leading to a decrease in the percent ionization of HF. This is because the increased concentration of H3O+ ions will make it more difficult for the HF molecules to ionize and release H+ ions into the solution.

Therefore, the correct answer is that the percent ionization of HF will decrease. The Ka for HF will not change, as it is a constant value for a given temperature and is independent of the concentration of H3O+ ions in the solution.

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