What is the percentage of oxygen in AgNO3?

Answer:

Sunspots are areas that appear dark on the surface of the Sun. They appear dark because they are cooler than other parts of the Sun’s surface. Solar flares are a sudden explosion of energy caused by tangling, crossing or reorganizing of magnetic field lines near sunspots.

Answer:

n = 2.1 mol

Explanation:

Given data:

Number of moles of gas = ?

Volume of gas = 56.3 L

Pressure of gas = 0.899 atm

Temperature of gas = 20°C (20+273 = 293 k)

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

0.899 atm × 56.3 L  = n × 0.0821 atm.L/ mol.K  × 293 k

50.614 atm.L = n × 24.055 atm.L/ mol

n = 50.614 atm.L / 24.055 atm.L/ mol

n = 2.1 mol

Answer:

8306.76

Explanation:

you just calcuate 8.12 x 1023 and that will give you the answer

Metallic elements exist in a solid-state and they are opaque, have a shiny surface, good conductors of electricity and heat, malleable and ductile, and are dense. The structure of metals is formed by atoms that are held together by metallic bonds. These atoms have loosely bound valence electrons that can be shared between the neighboring atoms.

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Under pressure, oxygen is contained in oxygen cylinders, and as the cylinder is used down, the pressure gauge steadily decreases.

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The alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.

The alkali metals have the high thermal and electrical conductivity. It has high lustre, ductility, and malleability as compared to other materials. Each alkali metal atom has one electron in its outermost shell which make more reactive.

So we can conclude that the alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.

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Answer:

1.1 x 10⁴ J

Explanation:

To calculate eth energy needed, you need to use the following equation:

Q = mcΔT

In this equation,

-----> Q = energy/heat (J)

-----> m = mass (g)

-----> c = specific heat (4.184 J/g°C)

-----> ΔT = change in temperature (°C)

You can plug the given values into the equation and solve.

Q = mcΔT

Q = (75.0 g)(4.184 J/g°C)(55.0 °C - 20.0 °C)

Q = (75.0 g)(4.184 J/g°C)(35.0)

Q = 11,000 J

Q = 1.1 x 10⁴ J

I₂ is a solid, Br₂ is a liquid, while Cl₂ and F₂ are gases because of their increasing molecular size and decreasing strength of their intermolecular forces.

The main factor influencing the physical states of halogens is the strength of the intermolecular forces (Van der Waals forces) between their molecules.

As you move down Group 17 in the periodic table (from F₂ to I₂), the size and mass of the halogen molecules increase. Larger molecules have a greater number of electrons, leading to stronger dispersion forces (a type of Van der Waals forces) between molecules.

For I₂, these forces are strong enough to hold the molecules together in a solid form. For Br₂, the forces are slightly weaker but still strong enough to form a liquid. However, in Cl₂ and F₂, the forces are weaker, allowing the molecules to be in a gaseous state at room temperature.

In summary, the physical states of the halogens depend on the strength of their intermolecular forces, which is influenced by the size and mass of the molecules.

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1-Methylcyclopentanol undergoes dehydration faster than cyclopentanol when treated with concentrated sulfuric acid (H₂SO₄). This is due to the presence of the methyl group (CH₃) attached to the cyclopentanol molecule.

Alcohols are dehydrated when a water molecule (H₂O) is taken out of the alcohol molecule. To speed up the reaction rate in this procedure, an acid catalyst such concentrated sulfuric acid is frequently utilized.

In comparison to cyclopentene, 1-methylcyclopentanol's methyl group accelerates the rate of dehydration. This is so because the methyl group, which donates electron density to the nearby carbon atom (alpha carbon) in the molecule, is an electron-donating group. The acid catalyst is more likely to attack the alpha carbon due to its higher electron density.

Since the protonation of the 1-methylcyclopentanol's alpha carbon by the acid catalyst proceeds more quickly as a result, a more stable carbocation intermediate is created. This makes it easier for a water molecule to be lost later and for the equivalent alkene product to develop.

Cyclopentanol, on the other hand, is devoid of the electron-donating methyl group and has a reduced electron density on the alpha carbon. As a result, compared to 1-methylcyclopentanol, the protonation step takes longer, and the dehydration reaction as a whole is less effective.

Therefore, when exposed to strong sulfuric acid, 1-methylcyclopentanol dehydrates more quickly than cyclopentanol due to the presence of the methyl group.

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To construct the Kc expression for the reaction NH3 + H2S ⇌ NH4SH, you need to write out the balanced chemical equation and then use the law of mass action to determine the equilibrium constant. The balanced chemical equation is:
NH3 + H2S ⇌ NH4SH

To write the Kc expression, you need to include the concentration of each reactant and product raised to its stoichiometric coefficient in the balanced chemical equation. The expression for Kc is:
Kc = [NH4SH] / ([NH3] [H2S])

Note that the concentration of each substance is enclosed in square brackets and the concentration of the product is divided by the concentration of the reactants.

You are given the alternative formulae for the substances involved in the chemical reaction. Replace each chemical formula with its corresponding concentration, and remember to keep the compounds in the same order in the numerator as they appear in the reaction from left to right.

The formula for Kc becomes: Kc = [(PNH4SH) / [(PNH3) (PH2S)]

Therefore, the Kc expression for this reaction is: Kc = [(PNH4SH) / [(PNH3) (PH2S)]

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Answer:

B

Explanation:

because protons have a +1 charge and electrons have a -1 charge, so if an atom is neutral it must have the same amount of protons and neutrons

Outgoing shortwave radiation depends on factors such as the angle of the Sun's rays, albedo, cloud cover, and atmospheric gases. These factors collectively determine the amount of solar radiation that is reflected, absorbed, and re-emitted by the Earth's surface, influencing the outgoing shortwave radiation.

Outgoing shortwave radiation depends on several factors. Firstly, it is influenced by the solar radiation received by the Earth's surface. The amount of solar radiation reaching the Earth is determined by the angle of the Sun's rays, which changes throughout the day and across different seasons. This means that outgoing shortwave radiation will vary depending on the time of day and the time of year.

Another important factor is the albedo, which refers to the reflectivity of different surfaces on Earth. Surfaces with high albedo, such as ice and snow, reflect more solar radiation back into space, resulting in lower outgoing shortwave radiation. Conversely, surfaces with low albedo, such as dark soil and vegetation, absorb more solar radiation, leading to higher outgoing shortwave radiation.

The presence of clouds also plays a role in outgoing shortwave radiation. Clouds can either reflect incoming solar radiation back into space or absorb and re-emit it as longwave radiation. The type and thickness of clouds, as well as their altitude, can affect the amount of outgoing shortwave radiation.

Finally, atmospheric gases such as water vapor, carbon dioxide, and ozone can also influence outgoing shortwave radiation. These gases absorb and re-emit some of the incoming solar radiation, impacting the amount of radiation that escapes back into space.

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Answer:

it was when she added the vinegar onto the baking soda paste. since bubbles formed it became a chemical reaction

Cations are always smaller than the atoms from which they form. Anions are always larger than the atoms from which they form. Ions are usually bigger than the atoms from which they are formed.

When an atom receives or loses electrons, the atom's electron configuration changes, resulting in a net positive or negative charge.

This net charge expands the electron cloud surrounding the nucleus, making the ion bigger in size than the neutral atoms from which it arose. When a metal atom loses one or more electrons to create a cation, it shrinks in size because the positive charge of the nucleus pulls the remaining electrons more strongly.

When a nonmetal atom obtains one or more electrons to create an anion, it normally expands in size.Because of the increasing amount of electrons, the electron cloud surrounding the nucleus grows. It should be noted that this comparison is not absolute and is dependent on the individual factors involved. Some ions are smaller than their neutral atom counterparts, while others are similar in size.

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The complete question is:

Compare the size of ions to the size of atoms from which they form.

The grams of sodium chloride  are needed to make 0.5 l of a 0.15 M solution is 4.38 g.

The molarity of the sodium chloride solution = 0.15 M

The volume of the sodium chloride solution = 0.5 L

The number of the moles of the sodium chloride = molarity × volume

The number of the moles of the sodium chloride = 0.15 × 0.5

The number of the moles of the sodium chloride = 0.075 mol

The molar mass of the sodium chloride = 58.4 g/mol

The mass of the sodium chloride = moles × molar mass

The mass of the sodium chloride = 0.075 × 58.4

The mass of the sodium chloride = 4.38 g

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The reaction between hydrogen fluoride and chlorine will result in the formation of hydrogen chloride and chlorine fluoride. The balanced equation is HF + Cl2 -> HCl + Calf.

The decomposition of water will result in the formation of hydrogen gas and oxygen gas. The balanced equation is 2H2O -> 2H2 + O2. The reaction between magnesium and oxygen will result in the formation of magnesium oxide. The balanced equation is 2Mg + O2 -> 2MgO the combustion of carbon tetrahydride (CH4) will result in the formation of carbon dioxide (CO2) and water (H2O). The balanced equation is CH4 + 2O2 -> CO2 + 2H2O In all of these reactions, it is important to ensure that the number of atoms of each element on both sides of the equation is balanced, in order to comply with the law of conservation of mass.

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75 for all

Explanation:

Answer:

Explanation: Li= Lithium, Na= Sodium, K= Pottasium, Rb= Rubdium Cs= Cesiuna, Fr= Fransium

6. Energy levels increases as if you move down a group during the number of electrons increases again.

7. A charge with higher and effective nuclear charge makes greater attractions to the electrons, pulling the electrons cloud closer to the nucleus makes it in a smaller atomic radius.

8. Ge= Germanium, He= Helium, O=Oxygen, Barium

Answer:

12 angle

Explanation:

Answer:

killer T-cell find and destroy infected cells that have been turned into virus-making factories

The amount of moles is therefore 0.23 mol 0.23 m o l.

molarity x number of litres = 0.2 x (75/1000) = 0.015 mol.

Molarity (M) is the most often used unit of solution concentration and is defined as the amount of solute in moles divided by the volume of solution in litres: M is the mole of solute per litre of solution. A 1.00 molar solution (written 1.00 M) contains 1.00 mole of solute per litre of solution.

The hydrochloric acid solution has a molarity of 3 M. This indicates that 1 L of solution contains exactly 3 moles of HCl. Our sample has a capacity of 50 mL.

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The time taken for the isotope of the sample element having a half life of 27.7 days to decay from its 600 g sample to 75 g is 36.09 days.

Radioactive decay is a nuclear reaction by which an unstable nuclei will undergo emission of charged particles such as alpha, beta, gamma.

By this process unstable nuclei will form their stable isotope or other new atoms. The decay constant k for the nuclear reaction is calculated from the half life time as below:

decay constant = 0.693 /27.7 days

                          = 0.025 days-1

Now the time taken for the decay of 600 g of the sample to 75 g is calculate as follows:

t = 1/(0.025) log (600/75)

  = 36.09 days

Hence,  time taken for the isotope of the sample element having a half life of 27.7 days to decay from its 600 g sample to 75 g is 36.09 days.

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Samira's model accurately depicts how the characteristics changed when the atoms were rearranged.

A model (most occasionally referred to just as a model, although distinct from a mental model in this context) is a bigger or smaller physical replica of an item. The simulated item might be tiny (for example, an atom) or huge (for example, the Solar System).

A physical model, in some respects, "is always the post structuralist of some mental model; the prototype is thought ahead as the blueprints of the physical one," which is then built as intended. Samira's model accurately depicts how the characteristics changed when the atoms were rearranged.

Therefore, samira's model accurately depicts how the characteristics changed when the atoms were rearranged.

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Yes, 1-hexene exhibits cis/trans isomerism. 1-hexene is a type of aliphatic olefin, an unsaturated hydrocarbon

Isomerism refers to a phenomenon where two or more compounds have the same molecular formula but a different structure, resulting in different chemical and physical properties . Isomers may be classified into two types based on the arrangement of atoms within the molecule. They are as follows:      

Cis-isomers:  These isomers have the same functional groups on the same side of the molecule. They have lower boiling points and higher melting points compared to trans isomers.The term "cis" is Latin for "on the same side."

Trans-isomers:  These isomers have the same functional groups on opposite sides of the molecule. They have higher boiling points and lower melting points than cis isomers.The term "trans" is Latin for "across."

1-hexene is a type of aliphatic olefin, an unsaturated hydrocarbon. It is a six-carbon alkene that contains a double bond between carbon atoms one and two (1-hexene). The molecular formula of 1-hexene is C₆H₁₂. 1-hexene has two isomers - cis and trans.  Therefore, it displays cis/trans isomerism.

The hydrogen atoms are on the same side of the double bond. The hydrogen atoms are on opposite sides of the double bond.

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Answer:

about 12 cm

Explanation:

Considering the frequency of 2,450 MHz, the wavelength of microwave oven radiation is about 12 cm and the quantum energy of a microwave photon is about 1 x 10-5 eV.

Answer:

b

Explanation:

deposition is the differentiates weathering from erosion

The mass balance equation is 0.15 M = [H₃PO₄] + [H₂PO₄⁻] + [HPO₄²⁻] + [PO₄³⁻] and the charge balance equation is [H₃O⁺] + [K⁺] + [Na⁺] = [H₂PO₄⁻] + 2 × [HPO₄²⁻] + 3× [PO₄³⁻] + [OH⁻]  for a solution containing 0.10 m KH2PO4 and 0.050 m Na2HPO4.

To find out the mass balance and the charge equation

Let's record all the reactions that result in the formation of the solutions and the equilibria that exist within them to aid in our ability to identify the ions that are there. Two soluble salts are dissolving in these reactions.

KH₂PO₄(s) → K⁺ (aq) + H₂PO₄⁻ (aq)

Na₂HPO₄  →  2Na⁺ + HPO₄²⁻

and the processes of acid-base dissociation for H₂PO₄⁻ , HPO₄²⁻ and H₂O

H₂PO₄⁻ + H2O  →   H3O⁺ + HPO₄²⁻

H₂PO₄- + H2O  →  OH⁻ + H₃PO₄

HPO₄²⁻ + H₂O  →   H3O⁺ + PO₄³⁻

2H2O  → H₃O⁺ + OH⁻

Please take note that the base dissociation reaction for HPO4 2⁻  was left out because its byproduct, H2PO4 ⁻, was previously taken into consideration in another reaction. Simple mass balance equations exist for K+ and Na+.

[K⁺] = 0.1M   [Na⁺] = 0.1M

However, the mass balance equation for phosphate requires some consideration. The same ions are produced in solution by H2PO4 and HPO4.

As a result, we can consider that the solution originally contains 0.15 M KH2PO4, which results in the mass balance equation shown below.

0.15 M = [H₃PO₄] + [H₂PO₄⁻] + [HPO₄²⁻] + [PO₄³⁻]

Hence final charge balance equation is

[H₃O⁺] + [K⁺] + [Na⁺] = [H₂PO₄⁻] + 2 × [HPO₄²⁻] + 3× [PO₄³⁻] + [OH⁻]

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Calculating this equation will give us the average translational kinetic energy of one molecule in the given ideal gas at 97.3°C.

To determine the average translational kinetic energy of a molecule in an ideal gas, we can use the equation:

E = (3/2) * k * T

Where:

E is the average translational kinetic energy

k is the Boltzmann constant (k = 1.380649 × 10^−23 J/K)

T is the temperature in Kelvin

First, let's convert the temperature from Celsius to Kelvin by adding 273.15:

T = 97.3°C + 273.15 = 370.45 K

Now we can calculate the average translational kinetic energy:

E = (3/2) * k * T

= (3/2) * (1.380649 × 10^−23 J/K) * (370.45 K)

T = 97.3°C

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