H2O, OH

H2O, HCN

CN, OH

CN–, H2O

Answer:

it's a property of a cell, tissue and organisms that allows to maintain and regulate the stability and constancy to function properly

Explanation:

Mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom.

Answer:

A bottle that is sealed would have the highest concentration.

Explanation:

When you put a gas into a container, the concentration or the amount of mol inside the bottle would be highly concentrated. If you open the bottle, the CO2 would spread outwards and leave the bottle giving more room between each molecule. The longer you open the bottle, the less concentrated the gas will be.

Answer:

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Answer:

Relative dating is based on the positions of fossils in rock layers. Lower layers were laid down earlier, so they are assumed to contain older fossils. This gives the fossil an approximate age in years. Absolute dating is often based on the amount of carbon-14 or other radioactive element that remains in a fossil up until extinction.

Relative dating is a method of dating where the geologic events are arranged and the rocks are left behind in a sequence. They function on the basis of the stratigraphy and don't provide us with actual numeric data.

Learn more about the discoveries to explain how the fossil record.

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Answer:

Atoms are neutral; they contain the same

samenumber of protons as electrons. By

definition, an ion is an electrically charged

particle produced by either removing

produced by either removingelectrons from a neutral atom to give a

produced by either removingelectrons from a neutral atom to give apositive ion or adding electrons to a neutral atom to give a negative ion.

Answer:skin cream

Explanation:

the independent variable is the variable that is always changed or manipulated. in this case the skin cream is the independent variable.

Answer:

law

Explanation:

it is called a scientific law

Answer:

D

Explanation:

its a very old study and philosophy of how to change basic substances such as metals into other substances

We know that the sunscreen preparation contains a 2.7% by mass of Benzyl Salicylate. From this, we will find that they need 1.559 kg of Benzyl Salicylate to make 340 tubes of sunscreen.

The initial data means that if the total mass of sunscreen is M, then the mass of Benzyl Salicylate will be 2.7% of M, or:

(2.7%/100%)*M = 0.027*M

Now, we know that a tube contains 6.0 oz of sunscreen.

Then M = 6.0oz

A tube contains:

0.027*6.0oz = 0.162 oz.

Then in 340 tubes, we will need 340 times 0.162 oz of Benzyl Salicylate, this is:

340* 0.162 oz = 55.08oz

And we want this quantity in kg.

Knowing that:

1oz = 0.028kg

Then 55.08oz is 55.08 times 0.028kg:

55.08*0.028kg = 1.559 kg

So they will need  1.559 kg of Benzyl Salicylate to make 340 tubes of sunscreen.

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Answer:

How to Convert a Number to Standard Form

Move the decimal point in your number until there is only one non-zero digit to the left of the decimal point. ...

Count how many places you moved the decimal point. ...

Write your scientific notation number as a x 10b and read it as "a times 10 to the power of b."

Explanation:

Answer:

A weak acid is an acid which dissociates partially to release few hydrogen protons or ions

Explanation:

[tex].[/tex]

To be in the path of totality means that

The path of totality is the track the Moon's umbral shadow leaves across the surface of the Earth. Its width measures up to 200 miles and its length measures up to 10,000 miles.

When the moon covers the earth's surface, a total solar eclipse has occurred.

An individual who is on the path of totality can observe the occurrence of a total solar eclipse within a short while.

Summarily, a person who is on the path of totality can see a total lunar eclipse.

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Los elementos que forman aniones con carga -1 y una capa externa estable de ocho electrones pertenecen al grupo de los: halógenos.

Para alcanzar la estabilidad, los átomos siguen la regla del octeto: ganan, pierden o comparten electrones para tener 8 electrones en su capa externa (capa de valencia).

Los elementos del Grupo 17 de la Tabla Periódica, conocidos como halógenos, tienen 7 electrones en su capa de valencia. Así, tienden a ganar 1 electrón para completar su octeto. Como los electrones tienen carga negativa, al ganar 1 electrón los aniones quedan con una carga de -1.

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Explanation:

I hope it helped U

stay safe stay happy

Answer:

Both particles A and B

Explanation:

A nucleus contains both protons and neutrons .

But protons are positively charged whereas neutrons have no charge.

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Both particles A and B are most likely present inside the nucleus of the atom. Therefore, option (c) is correct.

The nucleus of an atom contains the particles protons and neutrons. Both the solid particles in an atom are responsible for 99.9% of the mass in the nucleus.

The protons are the positively charged particles that lie inside the nucleus. Therefore, the nucleus of an atom has a positive charge on it while the negatively charged electrons rotate around the nucleus.

The neutrons do not carry any charge. So we can say that the neutrons are neutral. Therefore, the charge on the nucleus is only due to protons.

The atomic powers which are holding the protons and the neutrons inside the nucleus are also vast. The protons are prsent very close to each other inside the tiny nucleus, so the electrostatic forces of repulsion act in the nucleus.

Therefore, particles with no charge and positive charge are most present in the nucleus of the atom.

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Answer:

When a body covers equal distances in a straight line, equal intervals of time are called uniform motion

When a body covers unequal distance in equal intervals of time in a straight line is called non-uniform

Answer:

Uniform motion- is motion in which the

velocity does not change.

Non-uniform motion-occurs when the velocity of an object is not

constant : the object speeds up or slows down during its motion, or changes direction.

Hope it will help you !!

Explanation:

translate the following word equation in the form of balance come alive with your number is aluminium + hydrochloric acid and Aluminium chloride + nitrogen

my guess answer iss 1/4 if incorrect sorr

1/5 is the dilution of reagent A in water.

Explanation:

       [tex]D.F.=\frac{V_f}{V_i}[/tex]

       Where:

                 D.F = Dilution factor

                 [tex]V_f[/tex] = Final volume of the diluted solution

                 [tex]V_i[/tex]= Initial volume of the undiluted solution

Given:

4 parts of the reagent and 16 parts of water are mixed together to form a diluted solution.

To find:

The dilution of reagent A in water

Solution:

Parts of reagent A =[tex]V_i = 4[/tex]

Parts of water = 16

Final volume of solution = [tex]V _f = 4 + 16 = 20[/tex]

The dilution factor of reagent A:

[tex]D.F=\frac{20}{4}=5[/tex]

The dilution of the reagent A = [tex]1:5=\frac{1}{5}[/tex]

1/5 is the dilution of reagent A in water

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It is due to low volume of electron that causes large distance between two electrons.

When the added electron goes to smaller quantum level, the repulsive force between two electrons is less because the electron which is added occupies small space due to less volume so there is a large distance between two electrons that leads to less force of repulsion.

If the electron has more volume so it occupies more space and there will more repulsive force between two electrons so that's why we can say that the smaller volume of electron is the reason of less repulsive force.

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Answer:

-269.75 degrees Celsius

Explanation:

Answer:

c

Explanation:

it becomes positively charged

Answer:

The atom becomes positively charged.

Explanation:

If ALL OF THE ELECTRONS are removed, then there are, no matter what, less electrons than protons in an atom. And, since the atom has less electrons than protons, it becomes positively charged.

Answer:

Independant variable

Explanation:

Say you were doing a lab, you wanted to know if fertilizer actually helped a plant grow. The growth of a plant, in this situation, depends on whether you use fertilizer or not. You are changing if you use it or not, so it is the independent variable.  

A photon is an elementary particle that has zero invariant mass and travels in a vacuum with a constant velocity. It is capable of generating electromagnetic phenomena since it carries all forms of electromagnetic radiation:

The photon presents wave and corpuscular properties, this means that it behaves as a wave in certain phenomena, such as refraction in a lens; and as a particle when it interacts with matter to transfer energy. The latter is expressed as follows:

[tex]E=\frac{hc}{lambda} = hv[/tex]

This means that each photon has energy that is proportional to the frequency of light.  In this case, the energy is quantized, which means that the energy of the photons is restricted to certain values. The energy at subatomic levels occurs in packets that refer to the photon, which are the packages of energy and each one correspond to different types of radiation.

This differs from classical waves, which can gain or lose arbitrary amounts of energy.

If we apply the equation and replace the information, we have:

[tex]E=\frac{6.63 x 10^{-34} J/s x 3 x 10^{8} m/s }{498 nm} = 3.99 x 10^{-28} J[/tex]

So 3.99 x 10^-28 J is the amount of energy of the photon of 498 nm emmited from a silicon atom.

Now we will show that the atomic levels are quantized. An atom has ground state (n=1) energy of 13.6 eV. Higher states means the atom is at an excited state. When this happens, an electron from an atom loses energy and makes a transition to a lower state. To avoid this and conserve energy, the atom emits a photon with an amount of energy that equals the difference of energy between a ground state and another state. So we can calculate the energy of the electron in different states.

[tex]E_{n} = \frac{-13.6 ev}{n^{2} }[/tex]

[tex]E_{1} = \frac{-13.6 ev}{1^{2} }=-13.6 ev[/tex]

[tex]E_{2} = \frac{-13.6 ev}{2^{2} }=-3.4 ev[/tex]

[tex]E_{3} = \frac{-13.6 ev}{3^{2} }=-1.511 ev[/tex]

N represents the principal quantum number, which is the overall energy of each orbital. This energy increases as its distance from the nucleus increases. Here we can se that the value of energy of n=1 is higher than energy of n=2, and this one is higher from the energy of n=3. This means each level has a specific energy and it is quantized according to the value of n.

So, a photon is an elementary particle which carries radiation and presents a wave-corpuscle duality, where particles may exhibit wave-like behavior in some experiments while appearing as particles in others. A photon is emmited when an atom loses energy, to conserve this energy and avoid a transition to a lower state.  The electron energy is quantized because it is restricted to characteristic values, only taking non-continuous values. In this question, the amount of energy of the photon emmited is 3.99 x 10^-28 J. And the atomic levels are quantized according to the principal quantum number.

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