LOT OF POINTS!!!! PLEASE HELP ASAP NEED. HELP ASAP NO ROCKY PLS RN I WILL GIVE BRAINLIEST
Identify one or more choices that best complete the statement or answer the question.

Formulas of pairs of compounds of nitrogen oxides are given below. Which pairs are consistent for a given mass of nitrogen such that the first compound contains twice the mass of oxygen as the second compound?

a. NO4:NO2
b. NO4:N2O
c. NO2:NO
d. NO:N2O

a., b., and d. only

a. and c. only

a., c., and d. only

c. and d. only

To determine the molar concentration of Ni in the 20.0 mL solution, we can use the following steps:

We know that the initial sample of the solid contained Ni, so we can assume that the concentration of Ni in the original solution was also 6.79 ppm.

We know that the final volume of the solution is 100.0 mL.

We know that the initial volume of the sample was 5.91 g / 6.022 x 10^23 atoms/mol x 1000 molecules/atom = 0.00000998 L.

We know that the mass of the sample was 5.91 g.

We can use the formula for molar concentration:

Molar concentration (M) = Mass of solute (m) / Final volume (V)

We can rearrange this formula to solve for the mass of solute:

Mass of solute (m) = Molar concentration (M) x Final volume (V)

Substituting the known values, we get:

Mass of solute (m) = 6.79 ppm x 100.0 mL = 0.000679 g

We can convert this mass to moles by dividing it by the molar mass of Ni:

Moles of solute (m) = Mass of solute (m) / Molar mass of Ni (molar mass)

Substituting the known values, we get:

Moles of solute (m) = 0.000679 g / 62.94 g/mol = 0.00105 mol

We can use this value to find the number of moles of Ni in the original solution:

Number of moles of Ni in original solution (Ni) = Mass of solute (m) / Molar mass of Ni (molar mass)

Substituting the known values, we get:

Number of moles of Ni in original solution (Ni) = 0.00105 mol / 62.94 g/mol = 0.0000168 mol

Since we know that the initial volume of the sample was 0.00000998 L, we can calculate the number of moles of Ni in the original solution by dividing the number of moles of Ni in the original solution by the dilution factor:

Number of moles of Ni in final solution (Ni) = Number of moles of Ni in original solution / Dilution factor

We can use the fact that the final volume of the solution is 100.0 mL to calculate the dilution factor:

Dilution factor (d) = Final volume (V) / Initial volume (V) = 100.0 mL / 0.00000998 L = 1000000

Substituting the known values, we get:

Number of moles of Ni in final solution (Ni) = 0.0000168 mol / 1000000 = 0.000000168 mol

Therefore, the molar concentration of Ni in the 20.0 mL solution is 0.000000168 mol/mol or 6.79 x 10^-6 M.

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Answer:

A. The green light is absorbed

Answer:

Explanation:

Electron affinity is the measure of an atom 's tendency to form a negative ion. Electron affinity can be measured by the amount of energy released when an electron is added to an atom to form a negative ion. When forming a negative ion, an atom undergoes the following reaction:: atom + electron (e -) -> negative ion + energy

Answer:

a. 5.82km

b. 7.2956cm

Explanation:

The concentration of sodium ions in 0.300 M NaNO₃ is also 0.300 M.

NaNO₃ dissociates in water to give Na+ and NO₃- ions. Since NaNO₃ is a strong electrolyte, it completely dissociates into ions.

0.300 M NaNO₃ means that there are 0.300 moles of NaNO₃ in 1 liter of solution. Each mole of NaNO₃ dissociates into 1 mole of Na+ ions and 1 mole of NO₃- ions.

Therefore, the concentration of Na+ ions is also 0.300 M. This means that there are 0.300 moles of Na+ ions in 1 liter of solution. The concentration of Na+ ions and NaNO₃ is the same because Na+ ions come from NaNO₃.

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As you move across a period, new energy levels are not added. A new primary energy level is introduced by the first element inside a period

The shells or orbital within which an electron is situated relative towards the atom's nucleus is referred to as the electron's primary energy level in chemistry. The primary quantum number n denotes this level.

A new primary energy level is introduced by the first element inside a period of something like the periodic table. One aspect of the atomic model which is based on a mathematical thinking of atomic spectra is the idea of energy levels. As you move across a period, new energy levels are not added.

Therefore, as you move across a period, new energy levels are not added.

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Answer:

Presence of an Electrolyte

Metal Surface

Oxygen or Other Oxidizing Agent

Difference in Potential

Electrochemical Pathway

Explanation:

Answer:

Typically, the identity of a substance can be described by a: chemical name, for example, benzene; number, for example, EC number 200-753-7, and. chemical composition, for example, >99 % benzene and <1 % toluene.

Explanation:

Typically, the identity of a substance can be described as a: chemical name, for example, benzene chemical composition, for example, >99% benzene and <1% toluene. The composition is determined by chemical analysis.

I hope this helps.

The mammoth bone is approximately 11,000 years old. Since the half-life of 14C is 5,500 years and only 25% of the original 14C remains, the bone has undergone two half-lives (50% remaining after 1 half-life, 25% remaining after 2 half-lives). Therefore, 2 half-lives * 5,500 years per half-life = 11,000 years.

To answer your question, we need to use the formula for radioactive decay, which is:

Amount of remaining material = Original amount x (1/2)^(number of half-lives)

In this case, we know that the half-life of 14C is approximately 5500 years. We also know that only 25% of the original 14C is left in the mammoth bone. So, we can set up the equation like this:

0.25 = 1 x (1/2)^(number of half-lives)

We can solve for the number of half-lives by taking the logarithm of both sides of the equation:

log(0.25) = log(1) - number of half-lives x log(2)

Simplifying this equation gives us:

number of half-lives = log(1/0.25) / log(2)

number of half-lives = 2

Now that we know the number of half-lives, we can use the half-life of 14C to calculate the age of the mammoth bone. Since there are two half-lives, the age of the mammoth bone is:

Age = 2 x 5500 years

Age = 11,000 years

So the mammoth bone is approximately 11,000 years old. I hope that helps! Let me know if you have any further questions.

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Answer:

b is the correct answer

Answer:

B

Explanation:

IM A CHEMISTRY WIZZZZ

:)

I hope u get full marks on your paper/test/quiz or whatever!

There is a 20 percent chance so stay positive!

Answer:

D

Explanation: ultraviolet rays are harmful to humans

The reaction is a second order reaction, the rate with respect to F2 is 40 * 10 ^-4 torr/min and the molecular geometry is square planar.

Rate of Reaction;

rate = k[D]^a [f2]^b

The coefficient of DFu = 1

The rate of reaction = - rate of DFu

Let's add the values of trial (i) and (ii) and dividing (i) by (ii)

\(\frac{5.0*10^-^3}{10.0*10^-^3} = \frac{k[1500]^a[1500]^b}{k[3000]^a[1500]^b} \\\frac{1}{2} = [\frac{1}{2}] ^a\\a = 1 ...eq(i)\)

similarly for trial (i) and (iii)

\(\frac{5*10^-^3}{20*10^-^3}= \frac{k[1500]^a[1500]^b}{k[1500]^a[3000]^b} \\ \frac{1}{4} = [\frac{1}{2}]^b\\ b = 2 ...eq(ii)\)

The rate of the reaction is

\(Rate = k[D]{F_2]\\\)

a).

I will disagree because from rate equation above, it is a second order with respect to F2.

b).

As the rate of reaction or rate of formation of FDu in trial (iii) is

\(20*10^-^4\)

From equation of reaction

\(D + 2f_2 \to DFu\)

The rate with respect to F2

\(2 * 20 * 10^-^4 = 40 * 10 ^-^4 torr/min\)

c).

DFu

D has 8 valance electrons which is  group 18

This would mean that D has 4 bonds pair and 2 lone pair. This is at

\(AB_uX_2\)

x = lone pair

The molecular geometry = square planar

Which is i agree to this.

The reaction is a second order reaction, the rate with respect to F2 is 40 * 10 ^-4 torr/min and the molecular geometry is square planar.

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Answer:

See explanation

Explanation:

To convert from atm to mmHg

1 atm = 760 mmHg

0.799 atm = 0.799 atm * 760 mmHg/1 atm = 607.24 mmHg

To convert from atm to torr

1 atm = 760 torr

0.799 atm = 0.799 atm * 760 torr/1 atm = 607.24 torr

Answer:

The answer is

Explanation:

To find the number of atoms of titanium , given it's number of moles we use the formula

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

n = 0.075 mol

We have

N = 0.075 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

The maximum concentration of Mg+2 ions that can remain dissolved in the solution is determined by the solubility product constant (Ksp) for Mg(OH)2 and the concentrations of the relevant ions at equilibrium.

To calculate the maximum concentration of Mg+2 ions, we need to determine the concentration of OH- ions in the solution. Since NH3 is a weak base, it will react with water to form OH- ions according to the reaction:NH3 + H2O ⇌ NH4+ + OH-Using the equilibrium constant for this reaction (Kb for NH3), we can calculate the concentration of OH- ions in the solution.

Once we know the concentration of OH- ions, we can use the Ksp for Mg(OH)2 to calculate the maximum concentration of Mg+2 ions that can remain dissolved.This type of calculation is important in understanding how different ions interact in solution and how their concentrations affect each other. It is a common application of equilibrium constants and helps to explain why certain compounds are more or less soluble in water.

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Answer:

Pupil is the blackness in the middle, which is technically a "hole" in your eye which light goes through. The iris is the part that has color.

Explanation:

When someone asks you "what color are your eyes," they really mean "what color are your irises"

The Gibbs free energy change for the reaction is -3159 kJ/mol. Enthalpy of Al₂(C₂O₄)₃ = -3397 kJ/mol. Now, we need to find the Gibbs free energy of the reaction 2AL + 6(O₂) → Al₂(C₂O₄)₃.

For this, we need to calculate the Gibbs free energy change (∆G°) for the reaction using the formula: ΔG° = ΔH° - TΔS°, where T is the temperature and ΔS° is the standard molar entropy change of the reaction.

So, we first need to find the standard molar entropy change of the reaction. To do that, we need the standard molar entropies of all the reactants and products, which can be found in the table of thermodynamic data. However, the standard molar entropy of aluminum oxalate Al2(C2O4)3 is not given directly in the table. So, we need to use some other information to find it. Using the following balanced equation: 2 Al + 3 C2O4²¯ + 6 H2O → Al2 (C2O4) 3.6 H2O(s)

We can write the following equation for the standard molar entropy change of the reaction: ΔS°(reaction) = 2S°(Al) + 3S°(C2O4²¯) + 6S°(H2O) - S°(Al2(C2O4)3.6 H2O)

Now, let's look up the standard molar entropies of all the species in the table. The values are given below: Species | S° (J/mol.K)Al | 28.3C2O4²¯ | 259H2O | 69Al2(C2O4)3.6 H2O | 731.3.

Substituting the values in the equation above, we get: ΔS°(reaction) = 2(28.3 J/mol.K) + 3(259 J/mol.K) + 6(69 J/mol.K) - 731.3 J/mol.K

ΔS°(reaction) = -798.1 J/mol.K.

Now that we have found ΔS°(reaction), we can use the formulaΔG° = ΔH° - T.

ΔS°to find the Gibbs free energy change for the reaction. Substituting the given values, we get:ΔG° = (-3397 kJ/mol) - (298 K)(-0.7981 kJ/mol.K)

ΔG° = -3397 kJ/mol + 238 kJ/mol.

ΔG° = -3159 kJ/mol.

Therefore, the Gibbs free energy change for the reaction is -3159 kJ/mol.

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Answer:

Cl < P < Mg < Na

Explanation:

Cl must have the smallest radius because it is located to the right of the remaining elements on the same row. P  must have the second smallest radius because it is located to the right of the remaining elements on the same  row. Mg must have the Third smallest radius because it is located to the right of Na on the same row.  Therefore, Na has the Largest radius.

I hope it helps.

Answer:

mark as brainliest pls

Explanation:

Hematite can be described as a rock which contains a lot of iron. Hematite is an ore of iron from which substantial amount of iron can be won at profit depending on prevailing economic conditions in a place

Answer:

light grey

Explanation:

cause it just got mixed

When mixed polycarboxylate cement is mixed correctly, it should have a syrup-like in consistency, which thickens as it sets.

One for the few dental fillings that exhibits real adherence to tooth structure is polycarboxylate cement. The liquid consists polyacrylic acid and a copolymer made from that acid, while the powder is predominantly zinc oxide. As filling substances, protective cavity lines, luting materials as crowns, bridges, inlays, and orthodontic appliances, as well as for root canal fillings and pulp capping, they are also employed in these procedures. When mixed polycarboxylate cement is mixed correctly, it should have a syrup-like in consistency, which thickens as it sets.

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Answer:

Approximately \(3.6 \times 10^{-10}\; {\rm M}\), assuming that the solution is dilute and is at room temperature (such that \(K_\text{w} = 10^{-14}\).)

Explanation:

Look up the ion product constant of water:

\(K_{\text{w}} \approx 10^{-14}\).

In a dilute solution where water is the solvent, the product of \([{\rm {H_{3}O}^{+}}]\) and \([{\rm {OH}^{-}}]\) (concentration of \(\rm {H_{3}O}^{+}}\) ions and \({\rm {OH}^{-}}\) ions) is constantly equal to \(K_{\text{w}}\). (The unit of both \([{\rm {H_{3}O}^{+}}]\!\) and \([{\rm {OH}^{-}}]\!\) need to be \({\rm M}\).) In other words:

\([{\rm {H_{3}O}^{+}}]\, [{\rm {OH}^{-}}] = K_{\text{w}}\).

Rearrange this equation to find \([{\rm {OH}^{-}}]\) in terms of \(K_{\text{w}}\) and \([{\rm {H_{3}O}^{+}}]\):

\(\begin{aligned}[] [ {\rm OH^{-}} ] &= \frac{K_{\text{w}}}{[{\rm {H_{3}O}^{+}}]} \\ &= \frac{10^{-14}}{2.8 \times 10^{-5}} \\ &\approx 3.6 \times 10^{-10}\end{aligned}\).

Answer:

for a i think it is choice 2

for b i think it is the first choice

Explanation:

The inflation rate from 2014 to 2015, assuming 2014 as the base year, is 68.09%.

The inflation rate from 2014 to 2015, assuming that 2014 is the base year, can be determined using the Consumer Price Index (CPI). The CPI measures the cost of goods and services over time and is used to calculate inflation. The formula for calculating inflation rate using CPI is as follows: Inflation rate = ((CPI year 2 - CPI year 1) / CPI year 1) x 100To solve this problem, we first need to calculate the CPI for each year using the prices and quantities of nuts and meat.

Calculating CPI for 2014:CPI 2014 = (300 x $9) + (175 x $19) = $5,625 Calculating CPI for 2015:CPI 2015 = (420 x $9) + (340 x $14) = $9,460Using the CPI formula, we can calculate the inflation rate from 2014 to 2015:Inflation rate = ((CPI 2015 - CPI 2014) / CPI 2014) x 100= (($9,460 - $5,625) / $5,625) x 100= $3,835 / $5,625 x 100= 68.09% (to 2 decimal places) Therefore, the inflation rate from 2014 to 2015, assuming 2014 as the base year, is 68.09%.

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The absolute error that could be expected when measuring the half-life of radon-220 is 0.416 s

The following data were obtained from the question:

We can obtaine the absolute error as illustrated below:

Percentage error = (Absolute error / Actaul measurement) × 100

0.8% = Absolute error / 52

0.008 = Absolute error / 52

Cross multiply

Absolute error = 0.008 ×52

Absolute error = 0.416 s

Thus, the absolute error in measuring the half-life is 0.416 s

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Answer:

B. 4.0

Explanation:

Thermolysis, photolysis, and electrolysis are three different forms of breakdown reactions. A single source was cooked to yield two or more objects in each instance (decomposition).

Decomposition reactions happen when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input. For instance, the thermal breakdown of potassium hydroxide (KClO3) is a typical technique used during laboratories to generate oxygen gas.

Below is a typical illustration of a thermal breakdown reaction. Calcite breaks down into calcareous dioxide and atmospheric co2 when heated. The production of quick lime, a crucial component in numerous industries, uses this procedure.

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Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.