ANSWER ASAP FORF BRAINLIEST!!!!!
For this and the following two questions, determine the density of a substance (in g/dL) of a sample with a mass of 8.3 x 10-1 dag and a volume of 4.10 mL. What is the right-most significant figure after performing the calculation in scientific notation?

The value of the quantum number n for a spin-down electron in a 2s-orbital is 2 .

So , option D is correct one .

If a orbital is 2s then its value of all quantum number is  n=2 , l =0 and ml = 0 and s is -1/2 for spin-down electron .

"2s" stands for n=2 and "s" for l=0 ( where "p," "d," "f," etc. refer to l values of 1, 2, 3, and so on).

The electron has no orbital angular momentum because l=0 . But if the orbital angular momentum is zero , it follows that the angular momentum's z component must likewise be zero (ml=0).

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This is an electrophilic addition of a hydrogen halide to an alkene.

The pi bond is attacked by the electrophilic H⁺ from the H⁺Cl⁻, resulting in the loss of the double bond and the formation of a tertiary carbocation on C2. A less stable carbocation intermediate with the positive charge on C3 is also formed.

The nucleophilic Cl⁻ then attacks the carbocations, forming the haloalkane products. The major product will be 2-chloro-2-methybutane, where the Cl is bonded to the most substituted C (Markovnikov's rule). The minor product, if you have to worry about it, will be 2-chloro-3-methylbutane. The major product has no stereoisomers to worry about as it's achiral.

The attached image shows the scheme of this reaction. Only the major product is shown.  

Answer:

d. 10

Explanation:

The 24 means the atomic mass and twelve means the number of electrons. You subtract the number of electrons from the atomic mass. 24-12=12

Then, since there's +2, you subtract 2 from 12 which equals 10 which means there are 10 electrons now.

The confusing thing is that + means subtract and - means add here.

Hope this helps.

Answer:  

Greenhouse gas Chemical formula Global Warming Potential, 100-year time horizon

Carbon Dioxide

Methane

Nitrous Oxide

Chlorofluorocarbon

Explanation:

Answer:

Yes it does

Explanation:

it does because that’s correct and don’t erase my post again brainly

Answer:

why cant you just say the grasshopper eats the marsh grass the shrew eats the grasshopper and the hawk eats the shrew.

Explanation:

this makes sense to me but im not sure.

Answer:

the hawk eats both the snake and the shrew and so does the snake eat the shrew and frog and ex...

Explanation:

Answer:

False

Explanation:

There is a water cycle wherever there is water. If it is cold, the water cycle will just be very slow.

The wavelength of the radiation emitted by the argon ion laser is \(4.854 * 10^-7 m\).

Wavelength is a property of any type of wave that refers to the distance between two adjacent points on the wave that is in phase, i.e., at the same point in their respective cycles. It is usually denoted by the Greek letter lambda (λ) and is measured in units of length, such as meters or nanometers.

The energy carried by the photon (E) is related to the wavelength (\(\lambda\)) through the following equation:

\(E=hc/\lambda\); where 'h' is the Plank's Constant and 'c' is the speed of light which is \(3* 10^{-7} m/s\).

We can say that

\(\lambda - hc/E\)

Now after substituting the given values, we get:

\(\lambda = (6.626 * 10^{-34} J.s * 3.00 * 10^8 m/s) / (4.071 * 10^{-19} J)\\\lambda = 4.854 * 10^-7 m\)

Therefore the wavelength of the radiation emitted by the argon ion laser is \(4.854 * 10^-7 m\).

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Answer:

solution

Explanation:

Based on the percentage composition of the bleach solution, The number of moles of NaOCl in the bleach solution is 0.00447 moles.

The mass of bleach present in the given volume of bleach solution is determined from the formula given below as follows;

Volume of solution = 5.00 mL

The density of solution = 1.111 g/mL

Mass of bleach solution = 5.0 * 1.111

Mass of bleach solution = 5.555 g

The active compound in bleach is NaOCl

Mass of NaOCl in the bleach solution = 6.00% * 5.555 g

Mass of NaOCl in the bleach solution = 0.333 g

Molar mass of NaOCl = 74.5  g/mol

Moles of NaOCl in the bleach solution = 0.333 / 74.5

Moles of NaOCl in the bleach solution = 0.00447 moles

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Answer: i think its empirical

Explanation:

The volume of the alcohol would be in 200 mL of the solution is equal to 50 ml.

The concentration of the given solution can be explained in the terms of molarity, molality, and Normality. We can easily calculate the molar concentration of a substance in a solution.

In chemistry, concentration can be defined as the abundance of components divided by the total volume of a mixture.

The percent by volume of a solution can be calculated as the ratio volume of alcohol and the total volume of the solution.

The percent by volume = volume of alcohol / Total volume of solution

Given the total volume of the solution, = 200 ml

The  percent by volume  = 25 %

25 % =  volume of alcohol / 200

The volume of alcohol  = (25/100) × 200

Volume of alcohol  = 50 ml

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Valence electrons are electrons that are in the outermost orbitals of an atom. In the periodic table the elements are divided into groups. All elements of the first main group have one valence electron. All elements of the second main group have two valence electrons. And so on:

Answer:

45.24

Explanation:

10.24+35=25.24

Answer: 20.9 billion years.

Explanation: To estimate the age of the rock, we can use the fact that the half-life of uranium-238 is 4.47 billion years. This means that half of the uranium-238 in the rock would have decayed into lead-206 after 4.47 billion years, and half of what remains would decay in the next 4.47 billion years, and so on.

If 20% of the uranium-238 in the rock has decayed into lead-206, then 80% of the original uranium-238 is still present in the rock. This means that the rock has gone through one half-life of uranium-238 decay, and we can estimate its age by using the graph on page 253.

According to the graph, the ratio of lead-206 to uranium-238 after one half-life is approximately 0.027. This means that the rock contains 0.027 times as much uranium-238 as it did originally, and the remaining 80% of the uranium-238 corresponds to 0.8 times the original amount.

Therefore, we can estimate the original amount of uranium-238 in the rock as follows:

Original amount of uranium-238 = (0.8) / 0.027 = 29.63 times the current amount

Next, we can use the fact that each half-life corresponds to a reduction in the amount of uranium-238 by a factor of 2, to estimate the number of half-lives that have passed since the rock formed:

Number of half-lives = log2(29.63) = 4.88

Finally, we can estimate the age of the rock as follows:

Age of the rock = (4.88) x (4.47 billion years per half-life) = 20.9 billion years

Therefore, we can estimate that the age of the rock is approximately 20.9 billion years.

The nonessential saturated fatty acid with four double bonds is called Palmitoleic Acid, and its structural formula is CH₃(CH₂)₅CH=CH(CH₂)₇COOH. Its IUPAC name is (Z)-hexadec-9-enoic acid.

Nonessential saturated fatty acids are fatty acids that can be synthesized by the human body and are not required to be obtained from the diet. The human body has the ability to produce these fatty acids through de novo synthesis.

The structure of a nonessential saturated fatty acid with four double bonds is as follows:

Name: Palmitoleic Acid

Structural Formula: CH₃(CH₂)₅CH=CH(CH₂)₇COOH

IUPAC Name: (Z)-hexadec-9-enoic acid

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The pressure of the chlorine gas at the given condition is 1.7 atm.

The pressure of the chlorine gas at the given condition is calculated by applying ideal gas law.

PV = nRT

where;

The number of moles of 25 g of chlorine is calculated as follows;

n = m/M

n = 25/71

n = 0.352

The pressure of the chlorine gas at the given condition is calculated as;

P = nRT/V

P = (0.352 x 0.0821 x 263) / (4.5)

P = 1.7 atm

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Answer:

One atom of sulfur has a mass of 32.07 AMU; one mole of S atoms has a mass of 32.07 g.

Explanation:

Therefore, the answer should be 32.07 g

After 1.5 days, only 1.25 mg of technetium-99m will remain out of the original 80 mg that was prepared.

Technetium-99m (99mTc) is a radioactive isotope that is used in medical imaging.

It has a half-life of 6 hours, which means that after 6 hours, half of the original amount of technetium-99m will have decayed.

Therefore, after another 6 hours (12 hours total), half of the remaining technetium-99m will have decayed, leaving only 25% of the original amount.

After another 6 hours (18 hours total), half of the remaining technetium-99m will have decayed again, leaving only 12.5% of the original amount.

After 1.5 days, which is 36 hours total, we can use the formula for radioactive decay to calculate how much technetium-99m will remain: amount remaining = original amount x \((1/2)^{t/h}\) where t is the time elapsed and h is the half-life.

Plugging in the given values, we get: amount remaining = 80 mg x (1/2)^(36/6) amount remaining = 80 mg x \((1/2)^{6}\) amount remaining = 80 mg x 0.015625 amount remaining = 1.25 mg

Therefore, after 1.5 days, only 1.25 mg of technetium-99m will remain out of the original 80 mg that was prepared.

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The identity of planet is:

A) Jupiter : 778,600,000 km

B) Neptune : 4,495100,00 km

C) Saturn : 1433500000 km

D) Uranus : 2872500000 km

The distance from the sun of planets is given in kilometers.

A) 778,600,000 km : Jupiter

Jupiter is fifth planet from the sun. Jupiter is the largest in the solar system. it is famous for iconic red spot.

B) 4,495,100,000 km :  Neptune

Neptune is eight planet from the sun. Neptune is the farthest planet in solar system.

C) 1,433,500,000 km : Saturn

Saturn is sixth planet from the sun. Saturn is second largest planet in solar system.

D) 2,872,500,000 km : Uranus

Uranus is seventh planet from the sun. For Uranus , equator is nearly at right angle to its orbit.

Thus,

A) Jupiter : 778,600,000 km

B) Neptune : 4,495100,00 km

C) Saturn : 1433500000 km

D) Uranus : 2872500000 km

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There are several physical methods that can be used to monitor the rate of a chemical reaction are; Spectrophotometry, Conductometry, and Turbidity measurement

Spectrophotometry involves measuring the changes in the intensity of light absorbed or transmitted by a solution during a chemical reaction. Spectrophotometers are used to measure the amount of light absorbed or transmitted by a sample at different wavelengths.

Conductometry  involves measuring the changes in electrical conductivity of a solution during a chemical reaction. Conductivity meters are used to measure the electrical conductivity of a solution, which can change as the concentration of ions in the solution changes during a chemical reaction.

Turbidity measurement involves measuring the changes in the clarity or turbidity of a solution during a chemical reaction. Turbidimeters or nephelometers can be used to measure the amount of light scattered by a sample, which can change as particles form or dissolve during a reaction.

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--The given question is incomplete, the complete question is

"What are the physical methods of monitoring the rate of a chemical reaction?"--

When HCl is added to aqueous solution of sodium sulphate aqueous solution, sulfuric acid is formed, and the solution's chemical makeup and acidity get changed.

Thus, several chemical reactions happen when HCl is introduced to a sodium sulphate aqueous solution. While sodium sulphate breaks down into 2 Na+ ions and SO4^2- ions, HCl splits into H+ and Cl- ions. When the H+ ions from HCl interact with the SO4^2- ions, sulfuric acid, a more potent acid, is created.

The solution's H+ ion concentration rises as a result of this reaction, altering the equilibrium in favor of the products. As a result, the system's equilibrium is upset, which causes sulfuric acid to form. The solution's chemical makeup and acidity ultimately alter as a result of the addition of HCl.

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Answer:

The mass of the solid sample is 4.442 g (5.853 g - 1.411 g).

Explanation:

The mass of the solid sample can be determined by subtracting the mass of the weigh boat from the mass of the weigh boat and sample. This is because the weigh boat is a constant and known value, and it is used as a reference to measure the mass of the sample. To find the mass of the sample, we use the formula:

Mass of sample = Mass of weigh boat and sample - Mass of weigh boat

In this scenario:

Mass of sample = 5.853 g - 1.411 g = 4.442 g

Therefore, the mass of the solid sample is 4.442 g.

Answer:

Check the image file attached

Explanation:

Based on the description of the potential energy diagram provided, the diagram made by the student appears to be correct.

The potential energy diagram represents the energy changes that occur during a chemical reaction. In an endothermic reaction, the products have higher potential energy than the reactants, meaning energy is absorbed from the surroundings.

The curve line on the graph indicates the energy changes throughout the reaction pathway. It starts at a higher level, representing the initial potential energy of the reactants. As the reaction progresses, the potential energy decreases, indicating the formation of products with lower potential energy.

The broken horizontal line from point X on the y-axis to the point where the curve begins represents the activation energy (Ea) of the reaction. Activation energy is the energy barrier that must be overcome for the reactants to convert into products.

Point X on the y-axis indicates the potential energy of the reactants at the start of the reaction, and the broken line shows the energy required to initiate the reaction.

The broken horizontal line from point Y on the y-axis to the point where the curve ends represents the potential energy of the products. Point Y represents the potential energy of the products at the end of the reaction.

Overall, the student's diagram correctly represents an endothermic reaction, showing the potential energy changes, the activation energy, and the final potential energy of the products. The curve line starts at a higher level (representing the higher potential energy of the reactants) and ends at a slightly lower level (representing the lower potential energy of the products).

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The general form of a neutralization reaction is HF + FrOH → FrF + H₂O

We refer to this as a neutralisation reaction. Only this reaction, which produces NaCl and water as products, is a neutralisation reaction since it involves HCl and NaOH. The resulting response is listed below: NaCl(aq) + H₂O = HCl(aq) + NaOH(aq) (l)

The interaction of H⁺ ions and OH⁻ ions produces water in a neutralisation reaction, which occurs when an acid and a base combine to make water and a salt. The neutralisation of a strong acid and strong base yields a pH of 7.

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Answer:

0.052 M

0.059 m

Explanation:

There is some missing info. I think this is the complete question.

A student dissolves 4.6 g of glucose in 500 mL of a solvent with a density of 0.87 g/mL. The student notices that the volume of the solvent does not change when the glucose dissolves in it. Calculate the molarity and molality of the student's solution. Round both of your answers to 2 significant digits.

Step 1: Calculate the moles of glucose (solute)

The molar mass of glucose is 180.16 g/mol.

4.6 g × 1 mol/180.16 g = 0.026 mol

Step 2: Calculate the molarity of the solution

0.026 moles of glucose are dissolved in 500 mL (0.500 L) of solution. We will use the definition of molarity.

M = moles of solute / liters of solution

M = 0.026 mol / 0.500 L = 0.052 M

Step 3: Calculate the mass corresponding to 500 mL of the solvent

The solvent has a density of 0.87 g/mL.

500 mL × 0.87 g/mL = 435 g = 0.44 kg

Step 4: Calculate the molality of the solution

We will use the definition of molality.

m = moles of solute / kilograms of solvent

m = 0.026 mol / 0.44 kg = 0.059 m

Answer:

You will reach the smallest possible piece of the aluminum.

Explanation:

You will not be able to physically separate the aluminum into two smaller elements; aluminum is already a pure elemental substance. It will not divide forever, at some point it will be as small as you can possibly make it. However, you won't be able to erase the matter completely -- it will just become very very small!