how must the electronegativities of two atoms compare

The simplest formula for a compound is made up of 1.677 grams of iron and 0.640 grams of oxygen would be FeO.

What the question is asking here is the empirical formula of an oxide of iron made up of 1.677 grams of iron and 0.640 grams of oxygen. The empirical formula shows the formula in the simplest whole-number ratio of the atoms.

Iron (Fe) = 1.677 grams

Oxygen (O) = 0.640 grams

Converting the masses to moles:

Fe = 1.677/56 = 0.0299 mol

O = 0.640/16 = 0.0400 mol

Now, let's divide by the smallest mole:

Fe = 0.0299/0.0299 = 1.0

O = 0.0400/0.0299 = 1.3

Thus, the empirical formula of the oxide of iron is FeO.

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The percent ionization of a formic acid solution having the concentration (a) 1.00M is 1.37% ; (b) 0.500M is 3.23% ; (c)0.100M is 21.64% ; (d) 0.0500M is 58.73%

The percent ionization of a formic acid solution having a given concentration can be calculated using the formula : Percent ionization = [H+]/[HCOO-] × 100%

The formula of formic acid is HCOOH.

To calculate the percent ionization of a formic acid solution, it is necessary to use the Ka value of formic acid.

Ka for formic acid = 1.8 × 10^-4

Let's consider the reaction: HCOOH + H2O ⇋ H3O+ + HCOO-

Let the degree of ionization of formic acid be x.

Hence, [H+] = x M and [HCOO-] = x M

The concentration of unionized formic acid = (initial concentration - x) M

(a) 1.00 M :

Initial concentration = 1.00 M

Therefore, [HCOOH] = (1.00 - x) M

Ka = [H+][HCOO-]/[HCOOH]

Substituting the given values, we get, 1.8 × 10^-4 = x^2/(1.00 - x)

Thus, x = 0.0135 (Approx.)

Percent ionization = [H+]/[HCOO-] × 100%= x M/(1.00 - x) M × 100%

                               = 0.0135 M/0.9865 M × 100% = 1.37%

(b) 0.500 M :

Initial concentration = 0.500 M

Therefore, [HCOOH] = (0.500 - x) M

Ka = [H+][HCOO-]/[HCOOH]

Substituting the given values, we get, 1.8 × 10^-4 = x^2/(0.500 - x)

Thus, x = 0.0156 (Approx.)

Percent ionization = [H+]/[HCOO-] × 100%= x M/(0.500 - x) M × 100%

                              = 0.0156 M/0.4844 M × 100% = 3.23%

(c) 0.100 M :

Initial concentration = 0.100 M

Therefore, [HCOOH] = (0.100 - x) M

Ka = [H+][HCOO-]/[HCOOH]

Substituting the given values, we get, 1.8 × 10^-4 = x^2/(0.100 - x)

Thus, x = 0.0178 (Approx.)

Percent ionization = [H+]/[HCOO-] × 100% = x M/(0.100 - x) M × 100%

                              = 0.0178 M/0.0822 M × 100% = 21.64%

(d) 0.0500 M:

Initial concentration = 0.0500 M

Therefore, [HCOOH] = (0.0500 - x) M

Ka = [H+][HCOO-]/[HCOOH]

Substituting the given values, we get, 1.8 × 10^-4 = x^2/(0.0500 - x)

Thus, x = 0.0185 (Approx.)

Percent ionization = [H+]/[HCOO-] × 100% = x M/(0.0500 - x) M × 100%

                              = 0.0185 M/0.0315 M × 100% = 58.73%

Therefore, the percent ionization of a formic acid solution having the given concentrations are:

a. 1.00 M = 1.37%

b. 0.500 M = 3.23%

c. 0.100 M = 21.64%

d. 0.0500 M = 58.73%.

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Answer:

Well its actually the movement of tectonic plates under the earths surface that when the slide along each other, pull away from each other, or push up against each other they create earth quakes.

Explanation: yes.

Answer:

Explanation:

In the cycle, after a new moon, waxing means light appears on the right side of the moon and continues to increase.

Answer:

33g

Explanation:

200 divided by 6=33.33

Answer:

32.3%

Explanation:

Percent yield is defined as:

Actual yield (125.5g) / Theoretical Yield * 100

To find theoretical yield we have to find the moles of aluminium. As 2 moles of Al produce 2 moles of AlCl3, the moles of Al = Moles AlCl3.

With these moles we can find the mass assuming a 100% of yield (Theoretical Yield) as follows:

Moles Al = Moles AlCl3 (Molar mass Al = 26.98g/mol)

72g Al * (1mol / 26.98g) = 2.67 moles AlCl3

Mass AlCl3 (Molar mass: 133.34g/mol)

2.67 moles AlCl3 * (133.34g / mol) = 355.8g AlCl3

Percent Yield = 125.5g / 355.8g * 100 =

Answer:

18.9 moles of MgCl2 = 17.834 kg of MgCl2

Explanation:

The molecular weight of MgCl is 80.0 g/mol . So, to convert the given mole amount to grams, multiply this by this number, which is constant for all compounds with a specific composition (mass fraction).

Considering the original question was in the context of chemistry, I wanted to make it seem formal and more educational too. Hopefully that worked!  

EDIT: Came up with some text around what happens inside cells that would have made it better if someone just had an issue converting units, but I doubt my answer will be accepted >.<

When an acid dissolves in water, the solute present in the solution is \(H^{+}\) ions as they are released by the acid molecules. This is a characteristic of all acidic solutions.

When an acid dissolves in water, the acid molecules ionize to release \(H^{+}\) ions (also known as hydronium ions, \(H_{3}O^{+}\)).  The H+ ions are the solute present in the solution of an acid dissolved in water. . Some examples of acidic solutions are hydrochloric acid (HCl), sulfuric acid (\(H_{2}SO_{4}\)), and nitric acid (\(HNO_{3}\)).

The concentration of \(H^{+}\) ions in an acidic solution determines the acidity of the solution. Acids have a pH less than 7. The more the concentration of \(H^{+}\) ions, the stronger the acid is, and the lower the pH of the solution. The concentration of \(H^{+}\) ions in a solution can be measured using a pH meter or pH paper.

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The concentration of [H3O+] in the solution is approximately 3.16 x 10^(-5) mol/L or M (molar)

The pH of a solution is the degree of measurement of hydronium ions, [H3O+], in the solution. The pH scale is logarithmic, hence the formula applicable here is:

pH = -log[H3O+]

To find the concentration of [H3O+], we have:

[H3O+] = 10^(-pH)

Substituting the given pH value of 4.52 into the equation, we are able to calculate the concentration of hydronium ions:

[H3O+] = 10^(-4.52)

[H3O+] ≈ 3.16 x 10^(-5) mol/L

Therefore, the concentration of [H3O+] ions in the solution is about 3.16x 10^(-5) mol/L or M (molar).

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Answer:

prions

Explanation:

They are the smallest infectious agent.

In chemical reactions, reactants are substances which form products in a reaction and the number of molecules are balanced on both sides at the end of the reaction.

Reactants are the molecules or substances, that are present at the start of the chemical reaction.

They are usually written on the left-hand side of the equation.

Products are substances that are present at the end of the chemical reaction.

They are generally written on the right-hand side of the equation.

A generic chemical reaction can be written:

In this reaction, A and B are the reactants and C is the product .

In a balanced equation, the number of elements on the product side of the reaction is equal to the number of elements on the reactant side.

Therefore, reactants are substances which form products in a reaction and the number of molecules are balanced on both sides at the end of the reaction.

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Valences have the greatest tendency to form ions, are, +1,-1,+2,-2,+3,-3. All the options are correct.

Valence is the number of electrons lost or gained in a reaction to complete an element's outer energy level.

When an atom gains or loses a valence electron, it forms an ion. Atoms form ions in order to help another to obtain a full octet and to stabilize the valence.

Some atoms gain or lose electrons to form ions because they need to become more stable. They sometimes give them to have an outer shell or gain them to get a closer charge to eight.

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Answer:

+1,-1,+2,-2,+3,-3

Explanation:

No, cyclohexane would not behave similarly to water toward the charged rod.

Let's understand this in detail:

1. The primary reason for this difference is the polarity of the two substances. Water is a polar molecule, while cyclohexane is non-polar.

2. Polarity plays a crucial role in interacting with the charged rod. Polar molecules, like water, have a separation of charges due to the difference in electronegativity between their constituent atoms, which leads to the formation of a dipole moment.

3. This dipole moment allows water molecules to align themselves and interact with the charged rod, causing them to be attracted or repelled based on the charge of the rod.

4. Contrastingly, cyclohexane, a non-polar molecule, has an even distribution of electrons and no dipole moment. Therefore, it does not have a charge separation and cannot align or interact with the charged rod in the same way as water molecules.

5. This lack of interaction with the charged rod means that cyclohexane will not behave similarly to water in this scenario.

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Out of the given substances, only sugar and salt are highly soluble in water. The correct answer is option is C.

Solubility is the maximum amount of solute that can dissolve in a given amount of solvent at a particular temperature and pressure.

Salt and sugar are both highly soluble in water due to their ionic nature. Salt consists of positively charged sodium ions and negatively charged chloride ions, which readily dissociate in water to form a solution. Whereas sugar is a polar molecule that can form hydrogen bonds with water molecules, allowing it to dissolve easily in water.

On the other hand, Iron is not highly soluble in water and requires an acid or salt to increase its solubility. Glass is also not highly soluble in water as it is an amorphous solid and does not have a well-defined structure that can dissolve in water. Wood is also not soluble in water as it is a complex mixture of organic compounds that do not dissolve in water.

In conclusion, only sugar and salt are highly soluble in water due to their chemical structures. Iron, glass, and wood are not highly soluble in water due to their chemical properties. Option C is the correct answer.

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The given question is in inappropriate manner. The right question is:

Read the list of substances. wood, iron, sugar, glass, salt which substances are highly soluble in water?

Answer:

Terms in this set (5)

protects us from the sun.

protects from metors.

gives us oxygen and protein.

allows us to stay alive

Hope this helps u :D :3

Answer:

-protects us from the sun.

-protects from metors.

-gives us oxygen and protein.

-allows us to stay alive.

Explanation:

Your answer: The accurate equation regarding the relationship between equilibrium constants and standard cell potential is:
c. E˚cell = (RT/nF) ln K

The accurate equation for the relationship between equilibrium constants and standard cell potential is option C: E˚cell = (RT/ Nf) ln K. This equation is derived from the Nernst equation, which relates the standard cell potential (E˚cell) to the equilibrium constant (K) at a specific temperature. The equation shows that the cell potential depends on the temperature, the number of electrons transferred (n), the Faraday constant (F), and the gas constant (R). It also indicates that the standard cell potential is directly proportional to the natural logarithm of the equilibrium constant. Therefore, the accurate equation for the relationship between equilibrium constants and standard cell potential is C.
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Answer:

7. Option 2. Atom 1 and Atom 4

8. The same number of valence electron

Explanation:

7. Determination of which symbol represent an isotope.

Isotopes are atoms having the same atomic number but different mass number due to the difference in the neutron number.

From the question given above, the following were obtained:

Z => atomic number

A => mass number

Atom >>> Isotope >>>>> Z >>>> A

1 >>>>>>> ¹⁷₇E >>>>>>>> 7 >>>> 17

2 >>>>>>> ¹⁷₈E >>>>>>> 8 >>>> 17

3 >>>>>>> ¹⁸₆E >>>>>>> 6 >>>> 18

4 >>>>>>> ¹⁸₇E >>>>>>> 7 >>>> 18

From the table above, only atom 1 and 4 has the same atomic number. Hence, atom 1 and atom 4 are isotopes.

8. To know the correct answer to the question, we shall write the electronic configuration of magnesium and calcium. This can be obtained as follow:

Mg (12) => 1s² 2s²2p⁶ 3s²

Valence electron => 2

Ca (20) => 1s² 2s²2p⁶ 3s²3p⁶ 4s²

Valence electron => 2

We can see that magnesium and calcium both have the same valence electron. Hence, they will have similar chemical properties.

Answer:

Lawrencium (Lr)

Explanation:

The element with the given electron configuration is Lawrencium (Lr), which has an atomic number of 103.

Answer: PNS, CNS is

Periferal nervous system. Central nervous system.

Explanation:

The two-sided confidence interval is (87.85 ≤ μ ≤ 93.11) , with 87.85 being the lower level and 93.11 being the upper level.

The amount of product you actually get after doing an experiment is known as the experimental yield. Calculating the % yield will show you how much of the theoretical yield you actually achieved in a particular experiment. The quantity of pure and dry product produced in a chemical reaction is known as the reaction yield (absolute yield). The relative or percentage yield (%) is typically determined in order to assess the effectiveness of a chemical process in organic synthesis.

The percent yield can be calculated by applying the following formula:%yield = (actual yield/theoretical yield) x 100.

Step-by-step explanation:

Given the data:

91.6, 88.75, 90.8, 89.95, 91.3

Mean, m = Σx / n

n = sample size = 5

Mean = 452.4 / 5 = 90.48

Standard deviation, σ = 3

Zcritical at 95% = 1.96

Confidence interval :

Mean ± Error margin

Error margin = Zcritical*σ/sqrt

Error margin = 1.96 * 3/sqrt(5)

Error margin = 2.630

Lower boundary : 90.48 - 2.630 = 87.85

Upper boundary : 90.48 + 2.630 = 93.11

(87.85 ; 93.11)

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The flaw in Regina’s plan is that the time frame is unrealistic (option B).

Goal setting involves the development of an action plan designed in order to motivate and guide a person or group toward a goal, which is a result that one is attempting to achieve.

Effective goal setting lets you measure progress, overcome procrastination and visualize your dreams. However, setting goals is said to be effective when it is done in an adequate time frame.

According to this question, Regina identifies her goal and hastily writes it down as follows: I will make an A on my English literature term paper that is due next week.

This goal, although is great, is unlikely to be met because of the time frame. One cannot get an excellent result in something that lacks adequate preparation, which includes adequate time.

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what are the following things

Metals are good conductors and shows some peculiarities such as luster, ductility, malleability,etc. Brittleness is not associated with metals since they are hard. Hence option A is correct.

Metals are electropositive elements with good conductivity. Metals are classified into the s block and d block of periodic table. Thus alkali metals, alkaline earth metals and transition metals are the classes of metals.

Metals are rich in free electrons thereby, they capable of conducting electrically and thermally. Other features that metals have , they are hard and not brittle. Metals are malleable and ductile.

Malleability is the property by which it can be pressed into different shapes easily without cracking. Ductility means they can be plastically deformed into thin wires without fracture.

Metals are shining and this property is called lustrous. Hence all the properties such malleability, ductility and luster are features of metals but they are not brittle. Hence option A is correct.

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Your question is incomplete. But your complete question probably was:

Which of the following is NOT a property of metals associated with metallic bonds?

A Brittleness

B Malleability

C Ductility

D Luster

The equilibrium constant Kp for this reaction at 298 K. Option A  Kp = [A]^2/[A2] is the correct answer.

Endothermic reaction: A reaction in which energy is absorbed from the surrounding is known as an endothermic reaction. The following is the equation for the endothermic reaction A2(g) 2A(g). Equilibrium constant Kp: For a reversible reaction, the equilibrium constant, Kp, can be calculated using the equilibrium partial pressures of the products and reactants. For this reaction, the equilibrium constant Kp at 298 K can be calculated using the following equation:

The answer is Kp = [A]^2/[A2]. Option A is the correct answer. The equilibrium constant expression, as written in option A, is correct. Kp is the equilibrium constant that relates the concentrations of the products and reactants of a chemical equation at equilibrium and is represented by partial pressure instead of concentration when gas-phase reactions are involved. Kp will always be a positive value when a reaction goes towards the formation of products because there are no negative pressures.

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Answer:

The answer to your question is given below

Explanation:

The balanced equation for the reaction is given below:

2KClO₃ —> 2KCl + 3O₂

From the balanced equation above,

2 moles of KClO₃ decomposed to produce 2 moles of KCl and 3 moles of O₂.

Next, we shall determine the number of mole of KClO₃ that will decompose to produce 9 moles of O₂. This can be obtained as follow:

From the balanced equation above,

2 moles of KClO₃ decomposed to produce 3 moles of O₂.

Therefore, Xmol of KClO₃ will decompose to produce 9 moles of O₂ i.e

Xmol of KClO₃ = (2 × 9)/3

Xmol of KClO₃ = 6 moles

Thus, 6 moles of KClO₃ is needed for the reaction.

Next, we shall determine the number of mole KCl that will be produced by the decomposition of 6 moles of KClO₃. This can be obtained as follow:

From the balanced equation above,

2 moles of KClO₃ decomposed to produce 2 moles of KCl.

Therefore, 6 moles of KClO₃ will also decompose to produce 6 moles of KCl.

Finally we shall represent the reaction in a chart as illustrated below:

2KClO₃ —> 2KCl + 3O₂

6 moles —> 6 moles | 9 moles

Dipole-dipole forces are not the greatest force  \(CO_{2}\) from the examples given. While the largest forces in the other compounds, such as \(CH_{2}Br_{2}\), \(CH_{3}Br\), \(CHCl_{3}\), and \(CH_{3}OCH_{3}\), are dipole-dipole forces.

Despite having polar connections between its center carbon atom and two oxygen atoms, \(CO_{2}\) is a non-polar molecule. There are only London dispersion forces since the dipoles are pointing in opposite directions and cancel each other out.

There is an electronegative difference between the carbon atom and the halogen atom in the compound \(CH_{2}Br_{2}\), \(CH_{3}Br\), and \(CHCl_{3}\) . As a result, these compounds, which are also polar, include dipole-dipole forces. The dipole-dipole and London dispersion forces are both present in the compound \(CH_{2}Br_{2}\).

Dimethyl ether is \(CH_{3}OCH_{3}\). In methoxy methane (or dimethyl ether), the carbon and oxygen linkages are polar. Its geometry is angular. This molecule exhibits the London dispersion and dipole-dipole forces.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{5.67 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 9.418604...\)

We have the final answer as

Hope this helps you

The average molar mass of sulfur is 32.84g/mol

The average atomic mass of a chemical element is calculated by taking into account the atomic masses of its naturally occurring isotopes and their respective abundances

Here given data is natural sulfur consists of three isotopes :

95.0% sulfur-32 = 31.97 amu

0.75% sulfur-33 = 32.97 amu

4.21% sulfur-34 = 33.96 amu

So, we have to find average molar mass of the sulfur = ?

Formula for average molar mass = ∑i × isotope i  × abundance i

³²S = 95.0% abundance = 31.97 amu

³³S = 0.75% abundance = 32.97 amu

³⁴S = 4.21% abundance = 33.96 amu

This means that average molar mass of sulfur is

Average molar mass = 31.97 amu×95.0 +  32.97 amu× 0.75 + 33.96 amu×4.21

Average molar mass = 32.84g/mol

Average molar mass of sulfur is 32.84g/mol

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Answer:

12

my advice is split the equation into 2 and write on each side how many atoms of each element are there and it will be easier to balance.

Answer:

divide the mass of element in 1 mole of the compound by the compound's molar mass and multiply the answer by 100.

Explanation:

take the molar mass of hydrogen in the water molecule, divide by the total molar mass of water, and multiply by 100.

does it help?