Polyatomic ions that contain oxygen attached to some other element are called oxoanions. True or false???

Answer:

Neon

Explanation:

Chemical element Chemical series Electron configuration

3 . Li -Lithium Alkali metal [He] 2s1

4 . Be-Beryllium Alkaline earth metal [He] 2s2

5. B -Boron Metalloid [He] 2s2 2p1

6. C-Carbon Reactive nonmetal [He] 2s2 2p2

7 . N -Nitrogen Reactive nonmetal [He] 2s2 2p3

8. O-Oxygen Reactive nonmetal [He] 2s2 2p4

9. F -Fluorine Reactive nonmetal [He] 2s2 2p5

10. Ne-Neon Noble gas [He] 2s2 2p6

The option that does not represent a characteristic of a pure substance is:

C) It is made up of different types of particles.

A pure substance is a material that consists of only one type of particle, either atoms of an element or molecules of a compound. It does not contain different types of particles. This is what distinguishes a pure substance from a mixture, which is composed of two or more different substances mixed together.

Option A states that a pure substance has a uniform texture throughout, which means it is homogeneous. This is true because pure substances have a consistent composition and properties throughout.

Option B states that a pure substance has a fixed boiling point or melting point. This is also true because pure substances have well-defined temperature ranges at which they transition between solid, liquid, and gas phases.

Option D states that a pure substance can be an element or a compound. This is true as well because pure substances can exist as either single elements or compounds consisting of two or more elements chemically bonded together.

In summary, the correct option is C, as a pure substance does not consist of different types of particles.

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Answer:

unbalanced..........

Answer:

19.39mph

Explanation:

To calculate speed, the formula; distance (d)/time(t) is used.

In this question, a distance of 40yards and a time of 4.22seconds is given. We need to convert the distance to miles and time to hours.

If 3600s = 1 hr

Then 4.22s will be 4.22/3600 hours

= 0.001172hours.

If 1760 yd = 1 mile

Then 40 yd will be 40/1760 miles

= 0.02272miles

Hence, the speed in miles per hour (mph) = 0.02272miles ÷ 0.001172hours

= 0.02272 ÷ 0.001172

= 19.38566

= 19.39

Therefore, the speed of the player is 19.39 miles per hour (mph).

Answer:

+91.7 KJmol-1

Explanation:

Recall that ∆G= -RTlnK

Since ∆G in this case is ∆Grxn and K is the Ksp

Note that the Ksp is the solubility product (as shown by the reaction equation)

∆Grxn is the change in free energy for the reaction, in this case the ionization of the silver iodide into silver and iodide ions.

R= 8.314JK-1 and T =25°C +273 = 298 K (the centigrade temperature must be appropriately converted to its corresponding absolute absolute before proceeding with the calculation)

Hence we can substitute values accordingly;

∆Grxn = -(8.314 × 298 × ln 8.3×10^-17)

∆Grxn = +91.7 KJmol-1

Answer:

The answer is in the middle of the island...

Explanation:

Thanks....

Please provide further info next time.

Answer:

0.2m

Explanation:

I just took the test

Your welcome

Taking into account the definition of molality, the correct answer is the third option: the molality of the solution is 0.2 \(\frac{moles}{kg}\).

Molality is a measure of concentration that indicates the number of moles of solute that are dissolved in 1 kilogram of solvent.

This is, molality is the ratio of the number of moles of any dissolved solute to kilograms of solvent.

The Molality of a solution is determined by the expression:

\(molality=\frac{number of moles of solute}{kilograms of solvent}\)

In this case, you know:

Replacing in the definition of molality:

\(molality=\frac{0.133 moles}{0.725 kg}\)

Solving:

molality= 0.18 \(\frac{moles}{kg}\)≅ 0.2 \(\frac{moles}{kg}\)

Finally, the correct answer is the third option: the molality of the solution is 0.2 \(\frac{moles}{kg}\).

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Answer: 310K

Explanation: I got it right

Answer:

310 k

Explanation:

Hope this helps

Answer:

When endothermic reaction takes place, the system gains heat from the surroundings and so the temperature of the surroundings decreases ie. it gets colder

Explanation:

A chemical reaction is exothermic if heat is released by the system into the surroundings.

STUDY WELL!

The density of ammonia gas (NH3) at 66°C and 2.3 atm pressure is approximately 2.39 g/L.

To find the density of ammonia gas (NH3) at 66°C and 2.3 atm pressure, we can use the ideal gas law:

PV = nRT

where: P is the pressure (2.3 atm),

V is the volume,

n is the number of moles,

R is the ideal gas constant (0.0821 L·atm/mol·K),

T is the temperature (66°C = 339.15 K).

We can rearrange the equation to solve for the volume:

V = (nRT) / P

To find the density, we need to convert the number of moles to grams and divide by the volume:

Density = (n × molar mass) / V

The molar mass of ammonia (NH3) is:

1 atom of nitrogen (N) = 14.01 g/mol

3 atoms of hydrogen (H) = 3 × 1.01 g/mol

Molar mass of NH3 = 14.01 g/mol + 3 × 1.01 g/mol = 17.03 g/mol

Substituting the values into the equations:

V = (nRT) / P = (1 mol × 0.0821 L·atm/mol·K × 339.15 K) / 2.3 atm ≈ 12.06 L

Density = (n × molar mass) / V = (1 mol × 17.03 g/mol) / 12.06 L ≈ 2.39 g/L

Therefore, the density of ammonia gas (NH3) at 66°C and 2.3 atm pressure is approximately 2.39 g/L.

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Answer:

(A) Amine

Explanation:

Ch3Ch2Nh2 is an Amine.

An amine is often a functional group with a lone pair on the nitrogen atom. Amines structurally mimic ammonia, where nitrogen can link with up to three hydrogen atoms. Here the correct option is A.

Amines are organic substances that have a lone pair of nitrogen atoms in them. In essence, they are produced by replacing one or more hydrogen atoms in ammonia (NH₃) with an alkyl or aryl group, giving them the names alkylamines and arylamines, respectively.

In addition to medicines and treatments, amines are used to create nylon and azodyes. They are frequently employed in the creation of compounds for the filtration of water, and medicinal, and crop protection.

Thus the correct option is A.

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Increasing LED brightness with a lampshade or reflection and choosing LED lights with high luminous efficiency can be useful  to obtain a brighter lamp.

Lamp, lighting device, initially a jar housing a flame soaked in flammable substance, and later such light-producing devices as gas and electrical lamps.

The light was developed at least 70,000 years ago. Originally, it was a sunken rock filled in moss or other absorbent substance, saturated in animal fat, and burned. The ways to obtain a brighter lamp are

Increasing LED brightness with a lampshade or reflection.

To boost brightness, use greater color temperature LED lights.

Choosing LED lights with high luminous efficiency.

With increased voltage, LED lights get brighter.

Therefore, in above ways we can get brighter lamp.

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Protons and neutrons are present inside the nucleus of an atom while electrons revolve around circular orbits.

What is Proton and Neutrons?

The atom is made up of the subatomic particles electron, proton, and neutron. The atom is made up of a core nucleus that has neutrons and protons in it. The nucleus is surrounded by electrons.

Neutrons are neutral, protons are positively charged, and electrons are negatively charged.

All atoms' nuclei include protons, which are subatomic particles with a positive charge. One proton has a positive charge. The quantity of protons in the element's nucleus determines its atomic number. Two up quarks and one down quark make up protons. The mass of it is 1.007277 amu (atomic mass units).

All atoms, with the exception of hydrogen, include neutrons, which are subatomic particles that are neutrally charged.

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The equilibrium constant of the dissociation of potassium hydrogen tartrate (KHT) is equal to the square of the bitartrate concentration due to the dissociation of KHT into two hydrogen ions (H+) and bitartrate ions (HC₄H₄O₆⁻) as shown below:

KHT ⇌ H+ + HC₄H₄O₆⁻

Here, the equilibrium constant expression for the dissociation reaction of KHT can be written as follows:

Kc = [H+] [HC₄H₄O₆⁻]/ [KHT]

As we know, KHT dissociates into two moles of bitartrate ion (HC₄H₄O₆⁻) and one mole of hydrogen ion (H+). So, after the dissociation of KHT, the concentration of the bitartrate ion (HC₄H₄O₆⁻) will be double that of the hydrogen ion (H+).

Therefore, the concentration of hydrogen ion (H+) will be equal to the square root of the concentration of bitartrate ion (HC₄H₄O₆⁻).

Hence, Kc = [H+]²[HC₄H₄O₆⁻]/ [KHT] = [HC₄H₄O₆⁻]²/ [KHT]

This is the reason why the equilibrium constant of the dissociation of KHT is equal to the square of the bitartrate concentration.

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When a solution of sodium hydroxide is titrated against a solution of sulfuric acid, the following balanced equation is obtained.

2NaOH + H2SO4 → Na2SO4 + 2H2OTo determine the number of moles of NaOH reacting with one mole of sulfuric acid, the coefficients in the balanced chemical equation are compared. The coefficients indicate the ratio of moles of reactants and products.

In the balanced chemical equation 2NaOH + H2SO4 → Na2SO4 + 2H2O, two moles of NaOH react with one mole of H2SO4. Therefore, one mole of H2SO4 reacts with 0.5 moles of NaOH.

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To determine the pH of a solution using a pH indicator paper, you need a color chart or a color scale that corresponds to different pH values.

This color chart or scale is used to compare the color of the pH indicator paper after it has been immersed in the solution. The pH indicator paper is impregnated with a universal pH indicator, which is a chemical compound that changes color depending on the acidity or alkalinity of the solution.

The indicator undergoes a chemical reaction with the hydrogen ions (H+) or hydroxide ions (OH-) present in the solution, resulting in a color change.

By comparing the color of the pH indicator paper with the color chart or scale, you can determine the approximate pH of the solution. The color chart usually provides a range of colors corresponding to different pH values, allowing you to match the observed color to the nearest pH value.

In the hypothesis mentioned, the aim is to calibrate a cabbage pH indicator using the pH values obtained from a universal pH indicator. Therefore, in addition to the pH indicator paper and color chart, you would also need a range of solutions with known pH values to establish a calibration curve specific to the cabbage pH indicator.

In summary, to determine the pH of a solution using a pH indicator paper, you need a color chart or scale that correlates the observed color of the pH indicator paper with different pH values. This chart or scale serves as a reference for interpreting the color change and determining the pH of the solution.

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Answer: COLOR KEY

Explanation: CS

The correct option is: Methylation of cytosine

Genomic imprinting is primarily regulated by the methylation of cytosine residues in the DNA sequence.

During genomic imprinting, specific genes are marked with methyl groups, which can affect their expression patterns. Methylation of cytosine is an epigenetic modification that can result in the silencing or activation of certain genes, depending on the location and context of the methylation.

This process occurs during early development and is responsible for the differential expression of genes inherited from the mother and father.

Acetylation of histones and cytosine, as well as other histone modifications, can also contribute to gene regulation but are not primarily responsible for genomic imprinting.

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Answer:

The pOH of an aqueous solution of 7.85×10-2 M barium hydroxide is approximately 0.804. The pH of an aqueous solution of 7.85×10-2 M sodium hydroxide is approximately 13.196.

Explanation:

1. To find the pOH of the solution, we can use the following equation:

pOH = -log[OH-]

Since barium hydroxide dissociates in water to produce two moles of OH- for every mole of Ba(OH)2, the concentration of OH- in the solution will be twice the concentration of the barium hydroxide:

[OH-] = 2 × 7.85×10-2 M = 0.157 M

Substituting this value into the equation for pOH, we get:

pOH = -log(0.157) ≈ 0.804

Therefore, the pOH of the solution is approximately 0.804.

2. Sodium hydroxide (NaOH) is a strong base that dissociates completely in water to produce one mole of OH- for every mole of NaOH. The concentration of OH- in a 7.85×10-2 M solution of NaOH will therefore be equal to the concentration of the sodium hydroxide:

[OH-] = 7.85×10-2 M

To find the pH of the solution, we can use the following equation:

pH = 14 - pOH

Substituting the value we found for pOH in part 1, we get:

pH = 14 - 0.804 ≈ 13.196

Therefore, the pH of the solution is approximately 13.196.

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Therefore, it takes approximately 23.2 kJ of energy to boil 100 mL of water.

The correct answer is D. 100 mL × 1g divided by 1mL × 1mol divided by 18.02g × 4.186 kJ/mol = 23.2 kJ

To calculate the energy required to boil 100 mL of water, we need to use the specific heat capacity of water, which is approximately 4.186 J/g·°C. The molar mass of water is 18.02 g/mol.

First, we convert the volume of water from milliliters to grams:

100 mL × 1 g/1 mL = 100 g

Then, we calculate the number of moles of water:

100 g × 1 mol/18.02 g = 5.548 mol

Finally, we multiply the number of moles by the molar heat of vaporization of water, which is approximately 40.65 kJ/mol:

5.548 mol × 4.186 kJ/mol = 23.2 kJ

Therefore, it takes approximately 23.2 kJ of energy to boil 100 mL of water.

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The ratio of the volume and temperature of the gas in the given table is as follows:

Charles's law, also known as the law of volumes, describes the relationship between the volume and temperature of a gas at a constant pressure. According to this law, the volume of a gas is directly proportional to its absolute temperature (measured in Kelvin) when the pressure is constant.

In other words, as the temperature of a gas increases, its volume will also increase proportionally, and vice versa. Mathematically, Charles's law can be expressed as:

V/T = k

where V is the volume of the gas, T is its temperature in Kelvin, and k is a constant of proportionality.

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Answer:

Red: 17.24%

Yellow: 32.76%

Green: 50%

Explanation:

When combined with an oxidizing agent metals tend to Lose  electrons

The loss of electrons is referred to as oxidation. Each of the elements (for example, chlorine) might theoretically accept electrons from another element and be ionised as a result (e.g. Cl-). That is, they are all potentially oxidising agents.

Fluorine is such a strong oxidizer that solution reactions are impossible.

Chlorine can accept electrons from both bromide ions and iodide ions. Bromine and iodine are unable to recoup the electrons released by the chloride ions.

This suggests that chlorine is a more potent oxidising agent than bromine or iodine.

Similarly, bromine is a stronger oxidizer than iodine. Bromine may steal electrons from iodide ions to form iodine; iodine, however, cannot recoup those electrons from the ensuing bromide ions.

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The moderately reactive atoms located in the periodic table are fluorine, chlorine, bromine, and iodine which means the halogens family.

The number of balance electrons of the light metals compared to those heavier by listing elements in the order of increasing atomic number.

They are the five non-metals in family 7A of the periodic table. Halogens are chemical elements that form inorganic salts. In the periodic table they are part of group 17 or family 7A.

Halogens are strong oxidants and react mainly with alkali metals (Family I A) which tend to donate an electron. They also react with metals and noble gases (Family VIII A).

The chemical elements are arranged from left to right and top to bottom in order of increasing atomic number, or the number of protons in an atom's nucleus, which generally coincides with increasing atomic mass.

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What are halogen metals?

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

Explanation:

Metallic bond, force that holds atoms together in a metallic substance

The correct answer to the first part of your question is option (c): Energy is released by water vapor as it condenses.

When water vapor condenses into liquid water, it undergoes a phase change from a gaseous state to a liquid state. During this phase change, energy is released in the form of latent heat. This release of energy occurs because the water molecules in the vapor phase are more energetic and have higher kinetic energy compared to the water molecules in the liquid phase.

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If not all the magnesium is burned, the amount of oxygen in the compound would be less than expected, resulting in a smaller amount of magnesium oxide.

If not all the magnesium burned in a reaction with oxygen, it would affect the Mg:O ratio in the following way:
1. Since not all the magnesium reacted with oxygen, there would be less magnesium oxide (MgO) produced.
2. As a result, the ratio of magnesium (Mg) to oxygen (O) in the product would be lower than the true value.
3. This means the ratio would be smaller, as there is less magnesium in the product compared to what it should be if all the magnesium had reacted with oxygen.
In summary, if not all the magnesium burned, the Mg:O ratio would become smaller than the true value due to less magnesium being present in the final product.

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Answer:

The energy of the electromagnetic waves and gravitational radiation is a radiant energy. Radiant energy can travel through air, liquid, glass, space, or any other substance. It is created by changing configuration of electrons. Radiant energy can be transmitted in a vacuum environment, so the matter is not essential in transmitting radiant energy.

Explanation: