A radiation of 2530 amstrong incidents on HI results in decomposition of 1. 85 × 10^-2 mole per 1000 cal of radiant energy. Calculate the quantum efficiency

Answer:

There are millions of organic compounds but only thousands of inorganic compounds because:

a. organic compounds were formed by living things.

b. there is more carbon on Earth's surface than any other element.

c. atoms of elements other than carbon never combine with themselves.

d. carbon atoms can combine with up to four other atoms, including other carbon atoms.

Moles of Oxygen= 2.8075 moles

Given

29.2 grams of acetylene

Required

moles of Oxygen

Solution

Reaction(Combustion of Acetylene) :

2 C₂H₂ (g) + 5 O₂ (g) ⇒ 4CO₂ (g) + 2H₂O (g)

Mol of Acetylene :

= mass : MW Acetylene

= 29.2 g : 26 g/mol

= 1.123

From equation, mol ratio of Acetylene(C₂H₂) : O₂ = 2 : 5, so mol O₂ :

= 5/2 x mol C₂H₂

= 5/2 x 1.123

= 2.8075 moles

Answer:

0.485mol/kg

Explanation:

Molality is defined as the ratio of the number of moles of a solute to the kilogram of a solvent which is usually water.

Mass of NaBr = 10g

Molar mass of NaBr= 23+80=103g/mol

Mole of NaBr = mass / molar mass=10g/103g/mol= 0.097mol

Molality= Mole of a solute/ mass of solvent in kg

Mole of a solute( NaBr)= 0.097mol; mass of solvent( water in kg)= 200g. To convert to kg: 200g/1000g= 0.2kg

Molality = 0.097mol/0.2kg = 0.485mol/kg

Answer:

Both objects are in physical contact with each other

Explanation:

Conduction refers to the flow of heat from one object to another when the both objects are in contact with each other.

Hence, before heat can flow from one object to another, the two objects must be in contact with each other. This is a key requirement before conduction can take place.

Answer:

The answer is c. solid to gas

Answer:

Correct answer-C 5.3g

Explanation:

Molarity = no. of moles of solute/ volume of of solution in litre

olarity = no. of moles of solute/ volume of of solution in litreno of moles of solute = 0.125×0.25=0.03125

olarity = no. of moles of solute/ volume of of solution in litreno of moles of solute = 0.125×0.25=0.03125one mole AgNO3 weighs 169.87 gm,

olarity = no. of moles of solute/ volume of of solution in litreno of moles of solute = 0.125×0.25=0.03125one mole AgNO3 weighs 169.87 gm,so the mass of 0.03125 moles of AgNO3 = 0.03125×169.87= 5.3084g

The grams of AgNO₃ are needed to prepare 0.125 M solution in 250 mL of water is 5.3 grams.

Moles is a unit which is used to define any amount and it is calculated as:

n = W/M, where

W = required mass

M = molar mass

Given molarity of AgNO₃ = 0.125 M

Volume of water = 250mL = 0.25L

moles (n) from the molarity (M) will be calculated as:

n = M × V

n = (0.125)(0.25) = 0.0312 moles

Now we calculate the mass of AgNO₃ by using the above formula as:

W = (0.0312mol)(169.87g/mol)

W = 5.30 g

Hence option (c) is correct.

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Answer:

Zero

Explanation:

Recall that;

E = q + w

Where;

q = heat, w = work done

When heat is absorbed by the system q is positive

When heat is evolved by the system q is negative

When the system does work, w is negative

When work is done on the system w is positive

Step 1

ΔE1= 60 KJ + 40 KJ = 100KJ

Step 2

ΔE2= (-30 KJ) + (-70 KJ) = (-100) KJ

ΔE1 + ΔE2= 100KJ + (-100) KJ = 0KJ

Answer:

its 210

Explanation:

Just add all atomic mass used in the formula together: 2*(14+16*3)+88= 2*62+88=124+88=210

Hope this was helpful

The relative formula mass of strontium nitrate Sr(NO₃)₂ is 210

The relative atomic masses of N, O and Sr are 14,16 and 88 respectively.

In calculating the relative atomic mass of an element with isotopes, the relative mass and proportion of each is taken into account. Adding the atomic masses together gives the relative formula mass of a compound

So, relative atomic mass of Sr(NO₃)₂ is calculated as

88+ 2(14+16×3) = 210

The atomic mass constant (symbol: mu) is defined as being 1/12 th of the mass of a carbon-12 atom. Since both quantities in the ratio are masses, the resulting value is dimensionless; hence the value is said to be relative atomic mass.

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The molarity of phosphoric acid in a solution labelled 20% of Phosphoric acid by weight and a density of 1.12g/mL is 11.85 mol/L.

What is molarity?

The number of moles of solute divided by the number of liters of solution is the definition of molarity, a concentration unit in chemistry. Molarity is measured in moles per liter (mol/L).

Number of moles of phosphoric acid whose molar mass is 98:

\(Number of moles = \frac{mass}{molar mass}\)

n = 20/98

n = 0.204 mols

\(Volume = \frac{mass}{density }\)

V = 20/1.22

V = 17.85 ml

Molarity is the number of moles of solute per liter of solution.

\(M = \frac{n}{V}\)

Where, M = molarity, V = volume of solvent in liters, n = no. of moles of solute.

So, \(M = \frac{0.204}{17.85} \times \frac{1000}{1}\)

M = 11.85 mol/L

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By using the ideal gas law, the volume of CO2 produced is 246.4 L, and the volume of H2O produced is 201.6 L on burning 16 gms of substance.

The volume of CO2 and water is produced using the ideal gas law, assuming that the gases behave ideally.

Mass of substance A = 16 grams

Mass of O2 = 64 grams

Molar mass of CO2 =  44 g/mol

Molar mass of  O2 = 32 g/mol

Ratio of CO2:H2O

= mCO2 : mH2O

= 11: 9

Number of moles of substance A = 16 g / 44 g/mol

= 0.364 moles

Number of moles of O2 = 64 g / 32 g/mol

= 2 moles

Molar mass of CO2 = Molar mass ofH2O

(at standard temperature and pressure)

number of moles of CO2 = 11

number of moles of H2O = 9

Volume of CO2 = 11 moles × 22.4 L/mol

Volume of CO2 = 246.4 L

Volume of H2O = 9 moles × 22.4 L/mol

The volume of H2O = 201.6 L

(molar volume at standard temperature and pressure)

Thus, 246.4 L is the volume of carbon dioxide, and 201.6 L is the volume of water.

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In order to determine which isomer elutes first from a GC column, we need to consider their physical properties and how they interact with the column. Both 1-methylcyclohexene and 3-methylcyclohexene are structural isomers, meaning they have the same molecular formula but different arrangements of atoms.

The elution order of these isomers will depend on their boiling points, polarity, and molecular weight. The GC column is packed with a stationary phase, typically a high boiling point liquid, that interacts with the sample molecules as they pass through. The more polar the molecule, the stronger the interaction with the stationary phase, and the slower it will elute from the column. Based on their physical properties, we can predict that 1-methylcyclohexene will elute first from the GC column. This is because it has a lower boiling point (101 °C) than 3-methylcyclohexene (117 °C), meaning it is more volatile and will spend less time interacting with the stationary phase. Additionally, 1-methylcyclohexene is less polar than 3-methylcyclohexene due to the location of the methyl group, so it will have weaker interactions with the stationary phase and elute faster. In summary, the elution order of 1-methylcyclohexene and 3-methylcyclohexene on a GC column can be predicted based on their physical properties. 1-methylcyclohexene, with its lower boiling point and lower polarity, will elute first from the column.

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Answer:a mouse

Explanation:

Answer: a mouse

Explanation:

Answer:

symbol

Explanation:

His results showed that matter included particles much smaller than the atom.

J. J. Tomson concluded that atoms are divisible and that the corpuscles are their building blocks.

Atoms are made up of smaller particles.

J. J. Thomson discovered the electron ( the negative charges of the atom) in 1897.

His "plum pudding" model (1904) suggested: the electrons are embedded in the positive charge and evenly distributed throughout the entire atom.

With this model, he abandoned his earlier hypothesis that the atom was composed of immaterial vortices.

Later, scientist Rutherford demonstrate that J.J Thompson's Plum Pudding model was not accurate.

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The compound that will not pass through filter paper when stirred in water is (1) Hg₂Cl₂. This is because Hg₂Cl₂ is insoluble in water and forms precipitate when stirred in water. This precipitate will not pass through filter paper and can be separated from solution.

Compound is a substance that is made up of two or more different elements that are chemically bonded together in a fixed proportions. The elements in a compound cannot be separated by physical means, but can only be separated by chemical reactions. Compounds have their own unique chemical and physical properties that are different from the elements that make them up.

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Answer:

B

Explanation:

I think it should be B... you

Answer:

B) Solute

Explanation:

A solvent is Basically the base, for example Water, and the Solute is the substance that is added to it. like Sugar. you put Sugar(the solute) in the Water( the solvent). hope this helped you.

The mass number of the daughter atom formed from the alpha decay of a certain radioactive atom that has 90 protons and 142 neutrons is 228.

Alpha decay of a radioactive material is the release of an alpha particle that posseses mass number of 4 and atomic number of 2.

According to this question, a certain radioactive atom that has 90 protons and 142 neutron undergoes alpha decay. This means that the mass number of the daughter atom will be as follows:

Mass number of radioactive atom = 142 + 90 = 232

Mass number of daughter atom = 232 - 4 = 228

Therefore, the mass number of the daughter atom formed from the alpha decay of a certain radioactive atom that has 90 protons and 142 neutrons is 228.

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Nonpolar gases like methane have a weaker intermolecular force and cannot dissolve easily in polar solvents.

Hence, they dissolve best in nonpolar solvents.

Among these, the solvent that will be most effective at dissolving a nonpolar gas like methane is heptane.

The solubility of gases like methane in solvents depends on the nature of the solvent used.

Methane is a nonpolar gas that can dissolve in nonpolar solvents.

Nonpolar solvents like heptane have a weak intermolecular force, which is similar to that of methane, and this results in better solubility.

For instance, at room temperature, the solubility of methane in heptane is roughly 150 times its solubility in water, a polar solvent.

In summary, heptane is the most effective solvent to dissolve a nonpolar gas like methane.

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Answer:

An orbit is a fixed path around the nucleus where an electron must be found; an orbital is a probability region where an electron is likely (but

not necessarily) going to be found

Explanation:

Orbits are fixed elliptical paths where an electron must be found. The idea of orbits was introduced in the Bohr model of the atom. Electrons were shown to occupy fixed orbitals of quantized energy.

Orbital is an idea introduced by quantum mechanics. It refers to a region in space where an electron may be found. The wave mechanical approach does not view the electron as being found in a fixed orbital but rather defines a region in space around the nucleus where there is a high probability of finding the electron.

Answer:

Volcanoes form when tectonic plates collide and one plate is pushed beneath another.

Explanation:

Beer-law Lambert's states that a dye's absorbance is inversely proportionate to its concentration in cases like crystal violet.

The Beer-Lambert Law (also known as the Beer-Lambert-Bouguer Law) states that the absorbance of a dye such as crystal violet is directly proportional to its concentration. This means that as the concentration of the dye increases, the amount of light that is absorbed by the dye also increases. This law is important for measuring the concentration of a solution by measuring its absorbance of light. As the absorbance is directly proportional to the concentration, knowing the absorbance allows for the concentration to be calculated. Beer Lambert law, also known as the Beer-Lambert law of absorption, states that there is a linear relationship between the concentration of an absorbing species and the absorptivity of the material. In other words, the greater the concentration of a substance, the greater its ability to absorb light. This law is often used to measure and analyze the concentration of a particular substance in a given sample, such as the concentration of a dye in a solution.

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All neutron stars are pulsars, but not all pulsars are neutron stars. The statement is false . So, the correct option is (b).

Only neutron stars with electromagnetic beams that are directed toward the Earth are referred to as pulsars. We can observe periodic pulses emanating from pulsars using ground-based observatories or satellites. Pulsars are neutron stars that emit electromagnetic radiation along their magnetic poles. There could be a lot of these neutron stars whose electromagnetic radiation is completely oblique to the Earth.

The two components that give neutron stars their pulses—rapid rotation and a potent magnetic field—decrease over time, causing the pulses to progressively weaken and become less frequent. Even a young, brilliant neutron star may not be able to be distinguished from Earth as a pulsar. We only notice pulses if a pulsar star just so happens to be pointed in the proper direction.

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Answer:

180.155 g

Explanation:

The complete nuclear fusion of each reaction: 2 1 H (hydrogen) + 2 1 H (hydrogen) → 4 2 He (helium) + 1 0 n (neutron) + D (deuterium) + E (energy)

238 92 U (uranium)

Nuclear fusion is a process by which atomic nuclei combine to form a heavier nucleus, releasing a large amount of energy in the process. In nuclear fusion reactions, lighter elements combine to form heavier ones, resulting in the release of energy. One example of a nuclear fusion reaction is the fusion of two hydrogen atoms, which results in the formation of helium, a neutron, and the release of energy in the form of deuterium and energy (D and E). Another example is the fusion of uranium, which can result in the formation of thorium, helium, and the release of energy in the form of fissile and energy (F and G). These reactions play a crucial role in powering the stars, including our sun, and hold great promise as a clean and virtually limitless energy source for the future.

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Answer:

D: 3

E: 2

F: 234

G: 90

Explanation:

You have to get what is on the right to add up to the left in that row.

Also right on edge 2023

Answer:

2.04 g/cm3

Explanation:

Density = mass ÷ volume

= 5100 ÷ 2500

=2.04 g/cm3

Answer:

e

Explanation:

\(LiNO_{3}\)There are 0.075 moles of \(LiNO_{3}\) in 250 mL of a 0.30 M solution.

To determine the number of moles of \(LiNO_{3}\) in 250 mL of a 0.30 M solution, we can use the formula:

moles of solute = concentration (M) x volume (L)

First, we need to convert the volume from milliliters (mL) to liters (L):

250 mL = 0.25 L

Next, we can substitute the given values into the formula:

moles of \(LiNO_{3}\) = 0.30 M x 0.25 L

moles of \(LiNO_{3}\) = 0.075 mol

Therefore, there are 0.075 moles of \(LiNO_{3}\) in 250 mL of a 0.30 M solution.

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Explanation:

K2 L8 M1

first, we fill k shell where only 2 electrons can be found

then l electron which tends 8 electron

at last m

Answer:

The correct option is;

C. Yes, it would hurt because the bricks would still have the same mass

Explanation:

Given that the expression "like a ton of brick" refers to the tendency of an object being crushed by another object, which is due to the impact of the force, and from Newton's law a force is proportional to the rate of change of momentum produced, therefor if the brick of the same mass is given the same velocity as it had on the Earth while the person remains stationary, it will hurt if the brick hits the person.