Calculate each of the following quantities:
(b) Number of potassium ions in 88.5 g of potassium nitrate

Answer:

Explanation:

25.8 ml of .095 N NaOH is needed to neutralise the remaining acid

equivalent of NaOH used = 25.8 x .095 / 1000 = .002451 gm equivalent .

acid remaining = .002451 gm equivalent .

acid initially taken = 100 ml of .1 N  /  1000  = . 01 gm equivalent

acid reacted with metal = .01  -.002451 = .007549 gm equivalent

This must have reacted with same gram equivalent of metal oxide

.007549  gm equivalent = .15 gm of metal oxide

1 gm equivalent = 19.87 gm

equivalent weight of metal = 19.87 - equivalent weight of oxygen

= 19.87 - 8 = 11.87 .

1

Answer:

BE

Explanation:

0.125L

According to the dilution formula

where:

• C1 and C2 are the ,concentrations

• V1 and V2 are the, volumes

Given the following parameters

Requuired

Iniital volume V1

Substitute

Therefore the amount of volume required is 0.125L

Here are the electron configurations for each of the ions that are mentioned:

(a) A carbon atom with a negative charge:
To determine the electron configuration for a negative ion, we add electrons to the neutral atom's electron configuration. For carbon, the neutral atom has 6 electrons. Adding one electron gives us:
1s² 2s² 2p³
(b) A carbon atom with a positive charge:
To determine the electron configuration for a positive ion, we remove electrons from the neutral atom's electron configuration. For carbon, the neutral atom has 6 electrons. Removing one electron gives us:
1s² 2s² 2p²
(c) A nitrogen atom with a positive charge:
To determine the electron configuration for a positive ion, we remove electrons from the neutral atom's electron configuration. For nitrogen, the neutral atom has 7 electrons. Removing one electron gives us:
1s² 2s² 2p³
(d) An oxygen atom with a negative charge:
To determine the electron configuration for a negative ion, we add electrons to the neutral atom's electron configuration. For oxygen, the neutral atom has 8 electrons. Adding one electron gives us:
1s² 2s² 2p⁴.

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Answer:

true.

Explanation:

Carbon is an essential element for all life forms on Earth. Whether these life forms take in carbon to help manufacture food or release carbon as part of respiration, the intake and output of carbon is a component of all plant and animal life. Carbon is in a constant state of movement from place to place.

The correct statements are, the pH at the equivalence point of the titration of a strong acid with a strong base is 7.00, the starting pH of a weak acid titrated with a strong base is lower than the starting pH of a strong acid titrated with a strong base. Options B and D are correct.

Option B is correct because the equivalence point of the titration of a weak acid with a strong base occurs when all the weak acid has reacted with the strong base to form its conjugate base, which is a stronger base. This results in a solution that is basic, and therefore has a pH greater than 7.

Option D is correct because the starting pH of a weak acid titrated with a strong base is lower than the starting pH of a strong acid titrated with a strong base. This is because a weak acid does not completely dissociate in water, resulting in a lower initial concentration of H⁺ ions and a lower pH. As the strong base is added during the titration, the pH gradually increases until the equivalence point is reached.

Option A is incorrect because the equivalence point of the titration of a strong acid with a strong base is actually below pH 7.0, due to the formation of water in the reaction. Option C is incorrect because past the equivalence point, the pH increases slowly, not rapidly, due to the excess base that has been added.

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Answer: The answer is number 1.

Explanation:

Answer:

67.89

Explanation:it’s right

The percent composition of carbon in  compound of acrylonitrile is 22.646%.

Percent composition  is defined as a convenient way to record concentration of solution.It is a expression which relates mass of element  to mass of compound  as,mass of element/mass of compound×100.

Percent composition helps in elemental analysis of compound which is useful in analysis of ores also.  It helps in making solutions while performing the titrations.  It helps in prediction of chemical formula which can be predicted by mass and molar mass of an element.

The compound acrylonitrile  has a molar mass 53.06 g/mole and that of carbon is 12 g/mole thus, percent composition of carbon in  compound of acrylonitrile is 12/53.06×100=22.646%.

Thus, the percent composition of carbon in  compound of acrylonitrile is 22.646%.

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The characteristic of elemental bromine reacting vigorously with elemental sodium metal to form a white solid represents a chemical property.

Chemical characteristics define how substances react or change chemically. A white solid forms when elemental bromine and sodium metal combine, suggesting a chemical transition.

However, a substance's physical attributes can be detected or quantified without changing its chemical composition. Colour, density, melting, and boiling points are physical qualities.

It is a chemical property of elemental bromine to react with sodium metal and generate a new compound.

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Answer:

Yes it does change

Explanation:

Answer:

6.02x10^23 atoms  i think

Explanation:

5 fl oz stands for 5 fluid ounces. Fluid ounces are a unit of measurement for liquid volume. One fluid ounce is equal to approximately 29.57 milliliters.

When measuring liquids, it's important to use the correct units to ensure accurate measurements.

In cooking and baking, recipes often call for specific measurements of liquids, such as 5 fl oz of milk or 2 fl oz of vinegar. These measurements are important to ensure that the recipe turns out correctly. If too much or too little of a liquid is used, it can change the texture, taste, and overall outcome of the dish.

In terms of bottle sizes, you might see 5 fl oz bottle of shampoo or lotion. In this context, 5 fl oz refers to the amount of product that the container holds. This information can be helpful when comparing prices or determining how long a bottle will last.

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The ratio by mass of element ammonia is 14:3. and the ratio by mass of element carbon dioxide is 3:8.

The atomic mass, the quantity of matter possess in an atom of an element. It is represented as a multiple of one-twelfth the mass of the carbon-12 atom.

In the ammonia molecule, nitrogen and hydrogen are always present in the ratio 14:3 by mass, whatever the form in which it is obtained.

In every sample of carbon dioxide, there is 32.0 gram of oxygen is present for each 12.0 gram of carbon. By dividing 32.0 by 12.0, this simplifies to a mass ratio of oxygen to carbon of 3:8.

Thus, The ratio by mass of element ammonia is 14:3. and the ratio by mass of element carbon dioxide is 3:8.

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Your question is incomplete, most probably your question was

Mention the elements and the ratio by mass of elements present in:

Ammonia & Carbon dioxide

The volume of hydrogen gas produced at 315 K and 1.25 atm when 3.50 grams of zinc reacts with excess HCl is 1.16 L.

The balanced chemical equation for the reaction between zinc and hydrochloric acid is:

\(Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq)\)

We need to find the volume of hydrogen gas produced at 315 K and 1.25 atm when 3.50 grams of zinc reacts with excess HCl.

First, we need to determine the number of moles of zinc used in the reaction. The molar mass of zinc is 65.38 g/mol, so:

n(Zn) = 3.50 g / 65.38 g/mol = 0.0536 mol

Since 1 mole of zinc reacts with 1 mole of hydrogen gas, the number of moles of hydrogen gas produced is also 0.0536 mol.

Using the ideal gas law, PV = nRT, we can calculate the volume of hydrogen gas produced. We are given the temperature (315 K) and the pressure (1.25 atm), and the gas constant R is 0.0821 L·atm/(mol·K).

Substituting the values into the equation, we get:

V = (nRT) / P

V = (0.0536 mol) x (0.0821 L·atm/(mol·K)) x (315 K) / (1.25 atm)

V = 1.16 L

Therefore, the volume of hydrogen gas produced at 315 K and 1.25 atm when 3.50 grams of zinc reacts with excess HCl is 1.16 L.

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The statement that best describes the cell condition supporting Na+ sequestration in the vacuole is option B: Na+ sequestration can occur if the concentration of protons (H+) in the cytoplasm is less than the concentration of protons (H+) in the vacuole.

Option B accurately describes the condition that enables Na+ sequestration in the vacuole. In plant cells, the vacuole plays a crucial role in ion homeostasis by actively transporting ions such as Na+ into its lumen, maintaining a lower concentration of Na+ in the cytoplasm compared to the vacuole.

This sequestration process relies on proton pumps present in the vacuolar membrane, which actively transport protons (H+) from the cytoplasm into the vacuole, creating an electrochemical gradient. The higher concentration of protons (H+) in the vacuole creates an electrochemical potential that facilitates the uptake of Na+ ions.

By maintaining a lower concentration of protons (H+) in the cytoplasm relative to the vacuole, the cell can drive Na+ ions into the vacuole against their concentration gradient, effectively sequestering them and preventing their accumulation in the cytoplasm.

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Answer:

Refer to the picture.

The energy of the photon is 4 * 10^-19 J.

We have to note that the energy of the photon can be obtained by the application of the formula that connects the wavelength to the energy.

We have to note that;

E = hc/λ

E = energy of the photon

h = Plank's constant

c = speed of light

λ = Wavelength

We then have that;

E = 6.6 * 10^-34 * 3 * 10^8/488 * 10^-9

E = 4 * 10^-19 J

From the calculation, we have the energy of the photon as 4 * 10^-19 J here.

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\( \bf \large \implies{7.874 \: g/mg³}\)

Formula to used to find density

\( \bf \large \longrightarrow{p = \frac{m}{v} }\)

Putting the values according to the formula

\( \bf \longrightarrow{p = \frac{196.85 }{25} } \\ \\\bf \longrightarrow \frac{196.85 \: \div \: 5}{25 \: \div \: 5} = \frac{39.37 \div 5}{5 \div 5} = \frac{7.874}{1} \\ \\ \bf \longrightarrow7.874 \: g/mg³\)

Therefore, the density of the block is

7.874 g/mg³.

Answer:

A. gold has the highest monetary value?

Among the given elements, gold has the highest monetary value. So the correct option is A.

Gold (Au) is a chemical element that belongs to Period 6's Group 11 (Ib) and is a thick, glossy golden valuable metal. Gold has historically been extremely valued due to a number of characteristics. It is typically found in nature in a relatively pure form, is appealing in colour and brightness, resilient to the point of virtual indestructibility, and very flexible.

Due to its perceived worth from the beginning, gold has a history that is unmatched by that of any other metal. Gold is one of the densest metals.

It is a good heat and electrical conductor. It is also the softest, most malleable, and ductile of all the elements; a troy ounce (31.1 grammes) of gold may be hammered into gold leaf, which can be crushed into sheets as thin as 187 square feet (approximately 17 square metres).

Therefore the correct option is A.

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For substrate A, 3-chloro-3-methyloctane, the most likely substitution mechanism is S_N1 since this mechanism is governed by sterics. The bulky methyl group at the tertiary carbon makes it difficult for the nucleophile to approach the carbon from the backside, favoring the formation of a carbocation intermediate.

For substrate B, 1-chloro-5-methyloctane, the most likely substitution mechanism is S_N2 since this mechanism is governed by sterics. The primary carbon in this substrate is less hindered, allowing for easier nucleophile attack from the backside.

When 2-bromobutane is treated with sodium amide (NaNH2) in DMSO, the dominant mechanistic pathway is S_N2. The strong basicity of NaNH2 deprotonates the alpha carbon, creating a strong nucleophile that attacks the electrophilic carbon of 2-bromobutane.

The polar aprotic solvent DMSO also helps to solvate the reactants and stabilize the transition state.

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Answer:

The Coriolis effect is an apparent deflection in the paths of moving objects caused by Earth's faster speed near the equator than near the poles. In the solar system, the greatest expression of this effect occurs in planetary atmospheres. On Earth, for example, the air around us moves freely above the ground.

Explanation:

Answer

The formula form of Manganese (IV) perbromate is

Explanation

The formula of Manganese is Mn

The formula for perbromate is BrO₄⁻

Oxidation number of Manganese (IV) = +4, That is Manganese (IV) is Mn⁺⁴

Therefore, multiply the charge of manganese by 1 and perchlorate by 4 t

Answer:

The first question is option 2

and the second question in option 1

Explanation:

Answer:

36miles/hour

Explanation:

speed =distance÷time taken

102miles/2 5/6

102÷17/6

102×6/17

=36miles per hour

Answer:

True.

Explanation:

This is because when the number of protons in the nucleus increases the neutrons needed for a stable nucleus increases even more rapidly.

Best of luck!!!

Answer:

Soil permeability

Explanation:

Soil permeability is the ease with which gases, liquids or plant roots can penetrate or pas through the soil.

It is an important factor when considering soil property for agricultural purposes.

Answer:

Soil permeability

Explanation:

Answer:

+1

Explanation: