A student sets up the following equation to convert a measurement.
(The ? stands for a number the student is going to calculate.)
Fill in the missing part of this equation.
mol
(12) 0-
mol
0.0
X
Н
00

i)  Absolute dating method is used to measure absolute age of a rock using  radioactive decay of isotope.

ii) The working of this Absolute dating was discussed below:

By monitoring the radioactive decay of isotopes or the effects of radiation on the crystal structure of minerals, absolute dating techniques estimate the amount of time since rocks first formed. To help establish the age of rocks, paleomagnetism measures the ancient orientation of the Earth's magnetic field.

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Complete question:

To determining the absolute age of a rock, scientists measure the radioactive decay of isotope

i) What is name of this method?

ii) How this method works?

Answer:

Isotope N–14 = 99%

Isotope N–15 = 1%

Explanation:

Let isotope A be N-14

Let isotope B be N-15

From the question given above, the following data were obtained:

For isotope A (N-14):

Mass of A = 14

Abundance of A = A%

For isotope B (N-15):

Mass of B = 15

Abundance of B = (100 – A%)%

Atomic mass of nitrogen = 14.01 amu

Thus, we can obtain the relative abundances of the naturally occurring isotopes of nitrogen as illustrated below:

Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]

14.01 = [(14 × A%)/100] + [(15 × (100 – A%)/100]

14.01 = 0.14A% + 0.15(100 – A%)

14.01 = 0.14A% + 15 – 0.15A%

Collect like terms

14.01 – 15 = 0.14A% – 0.15A%

– 0.99 = – 0.01A%

Divide both side by – 0.01

A% = – 0.99 / –0.01

A% = 99%

Abundance of B = (100 – A%)%

Abundance of B = (100 – 99)%

Abundance of B = 1%

Thus, the relative abundances of the naturally occurring isotopes of nitrogen are:

Isotope N–14 = 99%

Isotope N–15 = 1%

The lewis structure of Chloamine can be given as above.

If one element shares electron with another elements to form bond. This is called as covalent bond. The compound which contain Covalent bond called Covalent compound.

Nitrogen is one of the elements of periodic table. It has 7 as atomic number and 14 as mass number. Its electronic configuration is 1s2 2s2 2p3. It belongs to 15th group and 2nd period of the periodic table. It accept three electron to get stable electronic configuration.

As we know that, chloramine has the chemical formula NH2Cl. Nitrogen has five valence electrons, each hydrogen has one valence electron, and chlorine has seven valence electrons.

Thus, we concluded that Nitrogen form three single bond two with hydrogen and one with chlorine atom.

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Answer: it’s 8.3

Explanation: on edge

Explanation:

Density=Mass/Volume

Mass=500gm

Volume=225ml

Density of juice=500/225=2.22gm/ml (approx)

Answer:

ionic bonds

Explanation:

ionic bonds result from the mutual attraction between oppositely charged ions. They tend to be stronger than covalent bonds due to the coulombic attraction between ions of opposite charges.

Answer: 4.76 * 10^2

476.

you bring the ending decimal to the first number and it takes you two hops to get the first number so that's what you put in the box after the 10

Answer:

Explanation:

HSO4 --> (NH4)2SO4

Yes it is a redox reaction.

H is +1

S is +7

on the other side..

N is -3

H is +1 (always +1, thats part of the oxidation rule)

S is +6

O is always -2

So what happened? Sulfur lost one electron, so it is reduced. This is why is a redox reaction.

Answer:

The answer will be 1992/5 or 398.4

Answer:

A

Explanation:

Phenol can form hydrogen bonds with water since it contains O-H group but nitrobenzene can not form hydrogen bonds with water.

Polar molecules tend to be soluble in water. The greater the dipole moment, the greater the polarity of the compound. We can see that  Nitrobenzene has a dipole moment of 4.2 x 10-9 esu cm while phenol has a dipole moment of 1.7 x 10-8 esu cm.

Now, It is confusing to observe that the solubility of Nitrobenzene  in water is far less than that of phenol despite its higher dipole moment. The reason for this observation is that, phenol can form hydrogen bonds with water since it contains O-H group but nitrobenzene can not form hydrogen bonds with water.

Therefore, phenol is more soluble in pure water as a solvent compared to nitorbenzene.

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The negative log of the hydrogen ion concentration of a solution - pH

The product of a neutralization reaction, a substance consisting of a positive ion from the base and a negative ion from the acid - salt

The reaction which occurs between acids and bases - neutralization

We know that the pH of a solution has to do with the amount of the acidity and the alkalinity of a solution. We know that the pH scale has been calibrated from 0 - 14. The range of the values from 0 -6 has been classed as as acidic. The number 7 has been shown to be a neutral solution while the numbers 8 - 14 has been shown to be a basic solution.

In a neutralization reaction, we would see the combination of an acid and a base so as to be able to produce salt and water and this kind of reaction would now produce a solution that has a neutral pH.

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Explanation:

Three things are required in proper combination before ignition and combustion can take place---Heat, Oxygen and Fuel. There must be Fuel to burn. There must be Air to supply oxygen. There must be Heat (ignition temperature) to start and continue the combustion process.

Answer:

Krypton

Explanation:

Answer:

I'm not entirely sure what your study is about, but I can tell you that any research or study that contributes new knowledge or insights to a particular field can be valuable. It's important to identify gaps in the existing literature and to approach your research with a clear and focused question or objective. Ultimately, the value of your study will depend on the quality of your research and the significance of your findings.

Answer:

Argon

Explanation:

It's atomic number is 18

hope that's it

We can use the formula:

Q = mcΔT

where Q is the heat absorbed or released, m is the mass, c is the specific heat, and ΔT is the change in temperature.

First, let's calculate the heat absorbed by the crown:

Q1 = mcΔT

Q1 = (1130 g)(0.129 J/g C)(98.8 C - 25.83 C)

Q1 = 107,776.6 J

Next, let's calculate the heat released by the crown into the water:

Q2 = mcΔT

Q2 = (m)(c)(ΔT)

Q2 = (1340 g)(4.184 J/g C)(27.84 C - 25.83 C)

Q2 = 11096.64 J

Since Q1 = -Q2 (heat lost by the crown is equal to heat gained by the water),

mcΔT = -mcΔT

We can then solve for the specific heat of the crown:

c = -(Q2/mΔT)

c = -(11096.64 J)/(1130 g)(27.84 C - 25.83 C)

c = 0.131 J/g C

The specific heat of pure gold is 0.129 J/g C, and the specific heat of the crown is 0.131 J/g C. Since the specific heat of the crown is slightly higher than that of pure gold, it is possible that the crown is not pure gold. However, other factors such as impurities or alloying metals can also affect the specific heat, so further analysis would be necessary to confirm if the crown is pure gold.

54.2 g of CaCl2 must be dissolved in 1000 g of water to raise the boiling point to 100.75°C.

To solve this problem, we can use the formula:

ΔTb = Kb × m × i

where ΔTb is the boiling point elevation, Kb is the molal boiling point elevation constant for water, m is the molality of the solution, and i is the van't Hoff factor, which represents the number of particles into which the solute dissociates.

We can rearrange this formula to solve for the molality of the solution:

m = ΔTb / (Kb × i)

We know that ΔTb is 0.75°C (100.75°C - 100°C), Kb is 0.51°C/m, and i for CaCl2 is 3 (since it dissociates into 3 ions in water). Substituting these values, we get:

m = 0.75°C / (0.51°C/m × 3) = 0.490 m

To find the mass of CaCl2 needed to make a 0.490 m solution in 1000 g of water, we can use the formula:

moles of solute = molality × mass of solvent (in kg)

We convert 1000 g of water to 1 kg, and then use the molecular weight of CaCl2 to convert from moles to grams:

moles of CaCl2 = 0.490 m × 1 kg = 0.490 mol

mass of CaCl2 = 0.490 mol × 110.98 g/mol = 54.2 g

Therefore, 54.2 g of CaCl2 must be dissolved in 1000 g of water to raise the boiling point to 100.75°C.

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Answer:

B) +2; 6; -2

Explanation:

In order to know what the coordination number is, all we need to do is to count the number of ligands present in the coordination sphere. Coordination number refers to the number of ligands in the coordination sphere of a given complex. The coordination number here is 6.

The counter ion here is 2Na+. It means that the overall charge on the complex must be -2 because the magnitude of charge on the complex ion is exactly balanced by the number of counter ions.

The charge on the metal (x) must now be;

x + 0 + 4(-1) = -2

x - 4 = -2

x = -2 + 4

x = +2

Note that NH3 is designated as zero because it is a neutral molecule. Each NCS^- ion has a charge magnitude of -1.

Answer:

4.42 x 10^22 molecules

Explanation:

1 mole of CO2 has 6.022 x 10^23 molecules

=> 0.0734 x 6.022 x 10^23 = 4.420148 x 10^22 or 4.42 x 10^22

Answer:

ok

Explanation:

Answer:

The correct answer would be - the easiest way is to wash with some polar solvent or salt solution or soap and water

Explanation:

Butyric acid is a carboxylic acid that has a putrid odor like rancid butter. If an individual touch this chemical will have the same odor on his hand and to get rid of it one should wash his hand with a polar solvent such as methanol, or salt solutions such as like NaHCO3, or soap and water that will form sodium butyrate that has no smell and easily dissolve and remove.

Thus, the easiest way is to wash with some polar solvent or salt solution or soap and water

The balanced equation are as follows:

A chemical equation is said to be balanced when the number of moles of each element on both sides of the equation are equal.

According to this question, two equations are given to remove harmful NO and NO2 gases from jet exhaust.

The balanced chemical equations are given below:

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The temperature rise of the solution can be considered to be due to the

heat given from the reaction reaction of magnesium and the acid.

Mass of magnesium added, is approximately 502.63 mg

Reasons:

The given volume of the HCl = 145.0 mL

Increase in the temperature of the solution, ΔT = 1.5°C

Heat capacity of the solution, c = 4.184 J/(g·°C)

Density of the solution = 1.00 g/mL

Required:

Mass of the metal (magnesium) placed in the calorimeter

Solution:

Mass of the solution, m = 145.0 mL × 1.00 g/mL = 145.0 g

Heat gained by the solution, Δq = m·c·ΔT

∴ Δq = 145.0 g × 4.184 J/(g·°C) × 1.5°C = 910.02 J

Number of moles of HCl = 0.5 moles × 0.145 = 0.0725 moles

The given reaction is; Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g), ΔH\(_{rxn}\) = -44 kJ

Therefore;

1 mole of Mg gives 44 kJ = 44,000 J of heat

910.02 J will be given by \(\dfrac{910.02 \, J}{44,000 \, J/mol}\) ≈ 2.068 × 10⁻² moles of magnesium

Molar mass of magnesium = 24.305 g/mol

Mass of magnesium added, \(m_{mg}\), is given as follows;

Mass of magnesium added, \(m_{mg}\) ≈ 502.63 mg.

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A renewable fuel known as "biomass" is ethanol, which is produced from various plant sources

\($$\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}+\mathrm{CH}_3 \mathrm{COOH} \rightarrow \mathrm{CH}_3 \mathrm{COOC}_2 \mathrm{H}_5+\mathrm{H}_2 \mathrm{O}$$\)

\(1 mole $\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}$ gives 1 moles $\mathrm{CH}_3 \mathrm{COOC}_2 \mathrm{H}_5$\)

\($44 \mathrm{gC}_2 \mathrm{H}_5 \mathrm{OH}$\) gives \($88 \mathrm{~g} \mathrm{CH}_3 \mathrm{COOC}_2 \mathrm{H}_5$\)

\($23 \mathrm{gC}_2 \mathrm{H}_5 \mathrm{OH}$\) gives\($44 \mathrm{~g} \mathrm{CH}_3 \mathrm{COOC}_2 \mathrm{H}_5$\)

Yield \($\frac{44}{44} \times 100$\)

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The number of molecules of sugar, C₁₂H₂₂O₁₁ you ingest given the data is 6.86×10²² molecules

1 mole of C₁₂H₂₂O₁₁ = 6.02×10²³ molecules

But

1 mole of C₁₂H₂₂O₁₁ = 342 g

Thus,

342 g of C₁₂H₂₂O₁₁ = 6.02×10²³ molecules

342 g of C₁₂H₂₂O₁₁ = 6.02×10²³ molecules

Therefore,

39 g of C₁₂H₂₂O₁₁ = (39 × 6.02×10²³) / 342

39 g of C₁₂H₂₂O₁₁ = 6.86×10²² molecules

Thus, 6.86×10²² molecules are present in 39 g of sugar, C₁₂H₂₂O₁₁

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Answer:

6.60 moles of ZnO have 537,108 g.

Explanation:

If an equation includes 7(CrO₄)₂, the numbers of Cr's and O's atoms that are there are 14 and 56 respectively.

The number of atoms present in a chemical compound can be calculated by multiplying the subscript of the particular element by any coefficient.

According to this question, 7 moles of chromate with the chemical formula; (CrO₄)₂ is given. The number of oxygen and chromium atoms in this compound can be calculated as follows:

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