formal units are formed by?

Answer:

In 1932, the physicist James Chadwick conducted an experiment in which he bombarded Beryllium with alpha particles from the natural radioactive decay of Polonium. The resulting radiation showed high penetration through a lead shield, which could not be explained via the particles known at that time.

Explanation:

Answer:

This means that waves need a medium to propagate, but light waves propagate where no particles are present. ...

The emission of a photon with the largest energy can be identified using the energy formula for an electron's transition between different energy levels in an atom.

The larger the energy difference between the initial and final energy levels, the larger the energy of the emitted photon. The energy difference between the initial and final energy levels is directly proportional to the frequency and inversely proportional to the wavelength of the emitted photon. Therefore, the larger the frequency or the smaller the wavelength, the larger the energy of the emitted photon.(a) n = 2 to n = 1: ΔE = 2.18 x 10^-18 J - 5.45 x 10^-19 J = 1.64 x 10^-18 J. The frequency of the emitted photon is given by:f = ΔE/h = (1.64 x 10^-18 J)/(6.626 x 10^-34 J s) = 2.47 x 10^15 Hz. The wavelength of the emitted photon is given by:λ = c/f = (2.998 x 10^8 m/s)/(2.47 x 10^15 Hz) = 1.21 x 10^-7 m.(b) n = 3 to n = 1: ΔE = 2.18 x 10^-18 J - 1.36 x 10^-18 J = 8.23 x 10^-19 J. The frequency of the emitted photon is given by:f = ΔE/h = (8.23 x 10^-19 J)/(6.626 x 10^-34 J s) = 1.24 x 10^15 Hz. The wavelength of the emitted photon is given by:λ = c/f = (2.998 x 10^8 m/s)/(1.24 x 10^15 Hz) = 2.42 x 10^-7 m.(c) n = 6 to n = 4: ΔE = 2.18 x 10^-18 J - 4.86 x 10^-19 J = 1.69 x 10^-18 J. The frequency of the emitted photon is given by:f = ΔE/h = (1.69 x 10^-18 J)/(6.626 x 10^-34 J s) = 2.55 x 10^15 Hz.

The wavelength of the emitted photon is given by:λ = c/f = (2.998 x 10^8 m/s)/(2.55 x 10^15 Hz) = 1.18 x 10^-7 m.(d) n = 1 to n = 4: ΔE = 4.36 x 10^-19 J - 2.18 x 10^-18 J = -1.74 x 10^-18 J. This is an absorption process, not emission.(e) n = 2 to n = 4: ΔE = 4.86 x 10^-19 J - 1.64 x 10^-18 J = -1.16 x 10^-18 J. This is an absorption process, not emission.Therefore, the correct answer is (b) n = 3 to n = 1 because it has the smallest wavelength and the highest frequency, and therefore, the largest energy of the emitted photon. The energy formula for this transition is ΔE = 8.23 x 10^-19 J, and the wavelength of the emitted photon is 2.42 x 10^-7 m.

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Answer:

14.5 moles of CH4

Explanation:

There is 14.5 moles of carbon in the product CO2....there has to be 14.5 moles of carbon in the reactant CH4

   14.5 moles

Answer:

its either A or C

Explanation:

Q) which sentence uses emitting correctly ?

Explanation :

Emitting means ' to give off ' , since birds are giving off a strange sound , we say " Charlie heard birds emitting a very strange sound " .

Answer:

observation

Explanation:

Observation: copper carbonate is a green solid and product CuO is a black solid. Hence, green color disappears, and black color appears. (a) copper nitrate. (b) copper carbonate.

Answer:

A food web is made up of all the food chains in a single ecosystem. Each living thing in an ecosystem belongs to many food chains. A food chain is a path that energy takes through a certain ecosystem. Trophic Levels. Organisms in food webs are grouped into categories called trophic levels.

Explanation:

I HOPE THIS HEPLS HAVE A WONDERFUL DAY!:)

Answer:

you didnt say if it was an animal or people food web so imma just try my best to explane tis is an animal food web. So it really is just showing was the animals eat and if they eat other animal basicly.

Explanation:

A 14-year-old adolescent girl, Alice, has been diagnosed with anorexia nervosa. In the assessment of Alice, the findings that are more commonly associated with anorexia nervosa are Dysmenorrhea, decreased body temperature, and Heat intolerance.

Dysmenorrhea: Anorexia nervosa can lead to hormonal imbalances and disruptions in the menstrual cycle, which can cause irregular or absent periods (amenorrhea) and sometimes dysmenorrhea (painful periods).

Decreased body temperature: Anorexia nervosa can lead to lower body weight and reduced body fat, which can result in a lower body temperature. This is a physiological response to conserve energy and maintain the body's functions.

Heat intolerance: Anorexia nervosa can affect the body's ability to regulate temperature properly, leading to increased sensitivity to heat or cold. Individuals with anorexia may feel more discomfort or intolerance in extreme temperatures.

Hence,  the findings that are more commonly associated with anorexia nervosa are explained above.

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Capillary action involves the hydrogen bonding in water.

We have to note that when we are talking about capillary action, what we mean is the movement of water up the paper. We know that this movement of water would have a lot to do with the kind of intermolecular interaction that is going on.

Note that the water is composed of polar O-H bonds that can be able to interact with the -OH bonds that can be seen in the cellulose that is water and this accounts for the capillary action in water.

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Answer:

Multicellular Organism

Explanation:

Unicellular organisms are made of one cell. For example, bacteria. Multicellular organisms are made up of more than one cell. For example, humans.

If the entire organism is one cell, that one cell carries out all the functions. In contrast, we have different cells to carry out different jobs. E.g. blood cells, skin cells, stomach cells and many more.  

Answer:

It  usually would depend on the strata, which are layers of rock, to know fossil age by looking at them, if a fossil was more on the top of the strata than another one, it’s the later one

Explanation:

Hope this helps!

Mark brainliest please but only if you would like to.

In a first-order reaction, it takes 23.02 days for 68 percent of the chemical to be destroyed.

Given,

fee constant for the destruction of pollutant = 0.1/day

We ought to discover the number of days it'll take for sixty eight percent of the chemical to be destroyed.

[A] = [A]₀e^⁻kt

in which [A] is the present awareness, and

[A]₀ is the initial awareness

k is the price of decrement

[A]₀ = 1

[A] = 0.1

Or, t =㏑(10)/k

Or, t = 2.302/zero.1

Or, t = 23.02 days.

for this reason the wide variety of days required for the destruction of sixty eight percent of chemicals is 23 days.

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Answer:

Determining temperature of atmosphere

Answer: B- Isotopes are often used for dating artifacts and fossils is incorrect.

Explanation: I hope that helped

Answer: C

Explanation: Edge

Sugar is a simple carbohydrate consisting of carbon, oxygen, and hydrogen molecules which are linked by covalent bonds.

The chemical covalent bonds are a type of chemical bond in which atoms that differ in their electronegativity share electrons to maintain cohesion i.e., intramolecular cohesion, while sugar molecules may interact by glycosidic bonds.

Therefore, with this data, we can see covalent bonds bind atoms in the sugar molecule while glycosidic bonds are those required to connect different sugar and thus form a complex macromolecule or polysaccharide.

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Answer: 215.0%

Explanation:

Explanation:

First, we need to rewrite the equation:

2K + 2H2O -> 2KOH + H2

This equation tells us that 2 moles of K react with 2 moles of H2O and produce 2 moles of KOH and 1 mole of H2.

If we have 43.7 grams of potassium, we can transform it into moles, compare with the ratio between Potassium and Hydrogen (H2) and then, calculate the quantity of hydrogen in grams.

So first, let's transform 43.7 grams of K into moles using the following formula:

moles = mass/molar mass

molar mass of K = 39.10 g/mol

moles = 43.7/39.10

moles = 1.12 moles

So:

2 moles of K --- 1 moles of H2

1.12 moles of K --- x moles of H2

2x = 1.12

x = 1.12/2

x = 0.559 moles of H2

Now let's transform moles into grams using the following formula:

mass = moles x molar mass

molar mass of H2 = 2.02 g/mol

mass = 0.559 x 2.02

mass = 1.13 g

Answer: It is produced 1.13 grams of H2.

Answer:

\(5.1 \div 5.63\)

The molarity of an HCl solution if 41.73 mL of HCl reacts with 7.8111 grams of sodium carbonate is 1.77M. Details about molarity can be found below.

The molarity of a solution can be calculated by dividing the number of moles of the substance by its volume.

According to this question, 7.8111 grams of sodium carbonate (106 g/mol) is given. The number of moles of sodium carbonate is calculated as follows:

no of moles = 7.811g ÷ 106g/mol = 0.074mol

Molarity of HCl = 0.074mol ÷ 0.04173L

Molarity of HCl = 1.77M

Therefore, the molarity of an HCl solution if 41.73 mL of HCl reacts with 7.8111 grams of sodium carbonate is 1.77M.

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Refer to the attachment

Answer:

7. Ionization energy

8. Lattice energy

9. Free energy

10. Activation energy

Explanation:

I. Ionization energy: The energy required to convert a ground-state atom in the gas phase to a gaseous positive ion. Thus, it is the minimum energy required to remove or detach an electron from a neutral atom in a gaseous state. Generally, atoms with relatively large atomic radii tend to have a low ionization energy.

II. Lattice energy: The energy change that occurs in the conversion of an ionic solid to widely separated gaseous ions. This ultimately implies that, it is the energy generated during the conversion of an ionic solid into gaseous ions and as such is a measure of the cohesive force binding the ions of an ionic compound using the Born-Haber cycle.

III. Free energy: the energy in a chemical or physical change that is available to do useful work. Thus, it is a thermodynamic quantity that measures the maximum capacity of a system to do work at constant temperature and pressure.

IV. Activation energy: The energy required to form the transition state in a chemical reaction. When the activation energy of a reaction is low, the rate of the reaction would be faster. Therefore, an enzyme speeds or catalyzes the rate of a reaction by lowering its activation energy.

Answer:  --- N^2 + --- F^2 => --- NF^3

              Question 28:  Answer:   1 N^2 + 3F^2 => 2NF^3

                                       Answer: 3F^2 , 2NF^3

Explanation:

The energy released when IMF'S formed between the molecules as they approach each other because making IMF'S lowers the energy of electron and increase the level of stability.

Atoms tends to stabilize when they form IMF's , ans release energy in the process. energy is released because of the greater level of stability associated with low energy.

Energy is released in the chemical bond formation because bonds are in stable configuration.  .the change in enthalpy will be negative for the process.the  reaction  is exothermic.In opposite breaking of bond required energy.

Thus ,energy is released when IMF'S formed between molecules as they approaches each other because they acquire greater level stability with low energy levels.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

The correct option is;

Cylinder A contains a gas that has a temperature closest to absolute zero

Explanation:

From the kinetic theory of gases, the average speed of a gaseous molecule is found from the following equation;

\(v_{rms} = \sqrt{\frac{3\cdot R \cdot T}{MW} }\)

Where:

\(v_{rms}\) = rms speed which is the square root of the average of the velocities of the gas molecules squared which is used in place of the average of the gas molecules as the sum of the velocities of all the gas molecules in the cylinder is zero

R = Universal gas constant = 8.3145 J/(mol·K)

MW = Molecular weight of the gas

Hence where we have;

\(v_{rmsA}\) = Average velocity of gas A = 0.0000001 m/s

\(v_{rmsB}\) = Average velocity of gas B = 0.3 m/s

Since, R and MW are constant for the gas in cylinder A constant, therefore, as \(v_{rmsA}\) ≈ 0 m/s, the temperature, \(T_A\), of gas A is closest to absolute zero.

Answer:

mass number = protons + neutrons.

Explanation:

Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.

The wavelength in nm of a wave that has a frequency of 2.22 x 10¹⁴ Hz is 1.35 × 10-⁶ m.

Wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next.

Wavelength is denoted by λ, and corresponds to the velocity of the wave divided by its frequency i.e. λ = v/f

According to this question, the frequency of a wave is given as 2.22 x 10¹⁴ Hz. The wavelength can be calculated as follows:

λ = 3 × 10⁸ ÷ 2.22 x 10¹⁴

λ = 1.35 × 10-⁶ m

Therefore, 1.35 × 10-⁶ m is the wavelength of the wave.

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Answer:

when the sun's light hits a living thing

When sulfur dioxide (SO2) and nitrogen oxides (NOX) are released into the atmosphere and carried by wind and air currents, acid rain is the volcanoes.

Thus, Nitric and sulfuric acids are created when the SO2 and NOX react with water, oxygen, and other substances. Then, before hitting the ground, they combine with water and other substances.

The majority of the SO2 and NOX that contribute to acid rain originates from burning fossil fuels, however a tiny amount comes from natural sources like volcanoes.  

Thus, When sulfur dioxide (SO2) and nitrogen oxides (NOX) are released into the atmosphere and carried by wind and air currents, acid rain is the volcanoes.

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