Please help me on this question

Answer:

B. The emiision spectrum of an element

Explanation:

just took the test

Answer:

b

Explanation:

Answer:

Ammonium Chloride

Explanation:

The compound NH₄Cl is commonly known as Ammonium Chloride.

I hope this helps.

The ionic compound name for NH₄Cl​ is ammonium chloride.

The ionic compound formed by the combination of ammonium (NH₄⁺) cation and chloride (Cl⁻) anion is called ammonium chloride. The ammonium cation is formed by the combination of a positively charged nitrogen atom and four hydrogen atoms bonded together. The chloride anion is a negatively charged chlorine atom.
Ammonium chloride is commonly used in various applications such as in fertilizers, in the production of dry cell batteries, as a flux in metalworking, and as a cough suppressant in medicine. It has a distinctive salty taste and is sometimes used in food as a flavoring agent, particularly in licorice candies.

Hence, the name of NH₄Cl​ is ammonium chloride.

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Answer:

C

Explanation:

Parallel makes the shadow happen every month

  non parallel would be less frequent

He should make the Moon orbit Earth at an angle to the table, and not parallel. So, the correct option is C.

The curving path that an object in space takes around another object as a result of gravity is known as an orbit. Moons orbiting planets, planets orbiting planets, and artificial satellites orbiting the Earth are examples of objects where this is frequently seen.

A route that an object in space follows around another is known as an orbit. A satellite is a thing that orbits the earth. An Earth- or moon-like natural satellite is one possibility. Moons are satellites that orbit many planets. A man-made satellite is also possible, such as the International Space Station.

The solar system's planets, comets, asteroids, and other celestial bodies revolve around the sun. The majority of solar system objects travel along or very near a hypothetical flat surface. The ecliptic plane is the name given to this hypothetical plane.

Therefore, the correct option is C.

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Carbondixoide gas is the type of greenhouse gas which is more difficult to control and eliminate.

Carbon dioxide is the greenhouse gas that is emitted through human activities which can be controlled by reducing human activities which is impossible for us because large number of products are produced from which carbondioxide gas is released.

So we can conclude that carbondixoide gas is the type of greenhouse gas which is more difficult to control and eliminate.

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Answer:

sulfur is found in group 16 period 3

The resistance and the effort force are used to calculate the mechanical advantage. Arranging the threads of the screw closer together will increase the mechanical advantage. Thus, option C is correct.

Mechanical advantage is the ratio of the output force to the input force. It allows easier task performance by obeying the conservation of mass.

The closer threads of the screws make the distance covered to be more, and the force applied will be multiplied which will be a mechanical advantage over threads placed far apart.

Therefore, option C. threads located closer have more mechanical advantages.

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Answer:

neutral

Explanation:

cause the all balance out

As the minerals are carried through the veins of the rock, they could settle there causing enrichment through crystal settling.

Minerals in rocks could be dissolved in aquoeus solutions in the rocks. When this occurs, the solutions could be carried through the veins in the rock.

As the minerals are carried through the veins of the rock, they could settle there causing enrichment through crystal settling.

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Answer:

12.665 mols

Explanation:

You can just plug into the equation finding n, which is moles. The equation would be n = PV/RT. atm is 9.16, Volume is 42, 0.08206 or 0.0821 in this case is the constant, and T is the temperature which is 370 Kelvin.

Answer:

52.12%

Explanation:

First you need to find the mass of the total molecule. The mass of one atom of Fe is 55.847. The mass of one atom of Cl is 35.453. The mass of O is 16.00, and the mass of H is 1.00. The mass of the whole atom is calculated as follows:

55.847 + 3(35.453) + 6(16.00)+ 12(1.00) = 270.206.

Next calculate the mass of water in the molecule:

(2)1.00 + 16.00 = 18.00(6 molecules) = 108

Finally, divide the mass of water by the mass of the whole molecule and multiply by 100 to get it as a percent:

108/207.206 = 0.52122 x 100 = 52.12%

The DNA sequence determines the different traits, therefore, the student's DNA models should have unique nucleotide sequences.

The different traits which are produced from the DNA molecule is dependent on the sequence of nucleotides in the DNA molecule.

The unique sequence of nucleotides are known as genes.

Therefore, the student's DNA models should have unique nucleotide sequences.

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Answer:

B) The DNA models should have unique nucleotide sequences

Explanation:

This answer is the only one that makes sense as it is the reason how only four different types of nucleotide (adenine, thymine, guanine, and cytosine) could be arranged into many different types of sequences to create different types of species.

Answer:

In the absence of gravity, plants use other environmental factors, such as light, to orient and guide growth. A bank of light emitting diodes (LEDs) above the plants produces a spectrum of light suited for the plants' growth.

Answer:

6%

Explanation:

60 g / 1000 g = 6%

The concentration of a solution in 60 g of NaCl are dissolved in 1L of water will be 6%.

The abundance of an ingredient ratio of the volume of a combination is called concentration. Mass concentration, molar concentration, number concentration, and volume concentration are all examples of mathematical descriptions.

Concentration can be calculated as:

C=m/V.

where, C is concentration , m is mass and V is volume.

It is given that, m = 60 g and V = 1L or 1000 mL.

Now, put the value of given data in above equation.

C= 60/1000

=6%.

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Answer:

Oxygen, nitrogen, and carbon dioxide are chemically bonded to one another.

other answer wrong coz carbon dioxide can be broken down into 1 Carbon, 2 Oxygen

Explanation:

The statement that best describes these three components of air is as follows:

Thus, the correct option for this question is A.

Air may be defined as the combination of invisible, odorless, and tasteless gases such as oxygen, nitrogen, carbon dioxide, etc. that significantly surround any celestial body like the earth.

A pure substance may be characterized as a type of substance that does not have to be a single chemical element. Due to this, water, nitrogen, carbon dioxide, oxygen, etc. are the valid and most accurate examples of pure substances.

The homogeneous mixture or combination of gases like air can also be remarkably considered a pure substance. It is up to the point until there is no change of phase.

Therefore, oxygen, nitrogen, and carbon dioxide are all classified as pure substances is the statement that best describes these three components of air. Thus, the correct option for this question is A.

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Compensatory responses are the compensation mechanism that maintains the body's fluid levels. The increased alveolar ventilation is seen in aspirin overdose.

Aspirin or acetylsalicylic acid is a general pain reliever that can cause poisoning when overdosed. It results in tinnitus, hyperventilation, increased heart rate, low blood pressure, fever, dehydration, etc.

Aspirin toxicity decreases the pH making the blood more acidic causing increased ventilation through alveoli to remove the excess carbon dioxide to balance the pH levels.

Therefore, in aspirin poisoning, the increased alveolar ventilation is the acute compensatory response.

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seeing that we already know the number of a dozen eggs is 12, after finding out the numbers of atoms in one egg, we multiply by 12.

Simply put, an Atom is the smallest unit of life, it should be noted that everything arround us is composed of an atom.

In summary, atoms are very small, they can only be seen using powerful microscope.

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Answer:

The higher the activation energy, the slower the chemical reaction will be.

Explanation:

your welcome

Answer:

The activation energy of a chemical reaction is closely related to its rate. Specifically, the higher the activation energy, the slower the chemical reaction will be. This is because molecules can only complete the reaction once they have reached the top of the activation energy barrier.

Explanation: Each and every chemical reaction require some amount of activation energy to begin. The activation energy enables the reactants to move and overcome forces of repulsion. The subsequent collisions between atoms facilitates the breaking of existing bonds and the formation of new ones.

Answer:

Natural selection is a process in which organisms are fit to adapt and live in the environment. Natural selection was an idea developed by Charles Darwin, Darwin contributed this idea when he was studying birds and tortoises at the Galapagos Islands. He then wrote his famous book, Origin of Species. Evolution is also very similar, evolution is a process in which organisms reproduce and mutate in order to survive and adapt. As you can see, natural selection and evolution are alike in many ways.

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The equation that is a decomposition reaction is

PbCO3(s) ---> PbO(s) + CO2(g)

That is option D. The properties of a decomposition reaction can further be understood below.

A chemical reaction is defined as the combination of substances called reactants to form a product. The various types of chemical reaction include:

Decomposition reaction is that type of chemical reaction in which the reactant breaks down to form two or more products.

Therefore the heating of lead (II) carbonate is a decomposition reaction.

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The solubility of carbon dioxide at 400 kPa  at room temperature is ;

( B ) 0.61 CO2/L

Given data

pressure of CO₂ = 400 Kpa = 3.95 atm

Kh of CO₂ = 3.3 * 10⁻² mol/L.atm

Solubility = pressure * Kh value of CO₂

                = 3.95 atm * 3.3 * 10⁻² mol / L.atm

                = 0.13 mol/l  CO₂

                = 0.61 CO₂ / L

Hence we can conclude that the solubility of CO₂ at 400 kPa is 0.13 mol/l  CO₂.

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From the options the closest answer is ( B ) 0.61 CO₂ / L

Answer:

Lighter-colored objects emit more light, and darker colored objects absorb more light. The more light an object absorbs, the more it heats up when it is exposed to light, which is why dark things get hot more quickly than light things if left out in the sun

Explanation:

Answer:

[tex] \: \boxed{ \sf \: Plutonium \: to \: Uranium \: is \: Alpha \: Decay! }[/tex]

Explanation:

Some nuclei attains more stabily by reducing their size, Alpha Decay is an example of such scenery.Nuclei having more than 210 nucleons, are so large in size hence the balancing force which prevents the repulsion between protons dominates, and due to excessive of protons lead to decay.

Consider any radioactive atom X with atomic mass A & atomic number z, when undergoes

alpha decay or radioactive emission, then the initial nucleus undergoes Excited state, and while returning to ground state it emits Gamma Radiation.

[tex]\boxed{\sf X_z^A \rightarrow Y_{z-2}^{A-4}+He_2^4+ \gamma }[/tex]

Given,

Parent nuclei X = Pu(A= 240, z=94)

Daughter nuclei Y = U(A= 236, z=92)

[tex]\sf Pu_z^A \rightarrow U_{z-2}^{A-4}+He_2^4 \\ \sf Pu_{94}^{240} \rightarrow U_{94 - 2}^{240 - 4}+He_2^4 \\ \sf Pu_{94}^{240} \rightarrow U_{92}^{236}+He_2^4 [/tex]

Hence the given fission of plutonium to uranium is Alpha Decay!

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Answer:

The answer is D. He can smell the scene to find flammable liquids.

Explanation:

He will smell an object then find the liquid that could of led to it.

Answer:

See below:Explanation:

P1V1/T1  = P2V2/T2

P1V1/T1   *   T2 / P2   = V2

15.17 *641.68 / 243.41    *  561.06/70.3  = 319.17 Liters

The Atomic Number indicates the number of protons = 56