Use the periodic table to identify the number of valence electrons available for bonding for each of the following elements.

C :
H:
N:

O:
P:
CI:

Answer: Atoms are made of dust because God made us with dust.

Explanation:

Answer:

20c answer is 20c hiuyffddffffy

Answer:

17000

J

(2 significant figures

solido

Explanation:

porque estan todos los puntos juntos

Answer:

Disadvantages of acid rain:

• Acid rain affects the fresh water ponds and lakes and destroys the aquatic life as some species of fishes are rare and may be extinct

• it can affect the trees particularly those that are high altitude

• It can damage historical monuments and buildings

•soil can be affected and can lead to deaths of good microbes

Advantages of acid rain:

• it makes holes in limestone below ground, which creates caves and places to store groundwater, as well as providing habitat for some species

• But the new study shows that sulfuric in acid may have benefits, limiting global warming by counteracting the natural production of methane gases by microbes in wetland areas.

Explanation:

Answer:

D. Plasma

Explanation:

Answer: Lithium, sodium and potassium are in the same group, alkali metals or Group 1A, because the Periodic Table is arranged according to the Periodic Law which states that chemical properties repeat at regular intervals.

Explanation: hope it helps :)

Despite this problem misses out crucial information for its solution, it turned out possible to come up with the attached absorbance graph, which shows the behavior of the absorbance of the sample with respect to the concentration at 453 nm.

As you can see, there is a red line and circle pointing out the concentration at which the sample has an absorbance of 0.20 (y-axis) which turns out to be 4x10⁻⁵ M (x-axis).

Now, since we require the moles of the iron (III) ions present in 100. mL of the sample, we recall the concept of molarity, which requires moles and volume in liters:

[tex]M=\frac{n}{V}[/tex]

Thus, since all the Fe⁺² in FeSCN⁺² is converted to Fe⁺³ we can find out the moles as shown below:

[tex]n=4x10^{-5}\frac{mol}{L} *0.100L\\\\n=4x10^{-6}mol[/tex]

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Answer:

Similar: both processes of cell division; both processes take place in the nucleus of the cell

Different: mitosis divides into 2, meiosis divides into 4; one is the division of body cells and the other is of specifically sex cells

Explanation:

https://byjus.com/biology/mitosis-and-meiosis/

^ this has more info!

Answer:yes

Explanation:

cause yes

Answer:

p=F/A.Explanation:

10 grams

mass does not change when cooking the egg

Explanation:

Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.

Answer:

Each element within a group has similar physical or chemical properties because of its atom's outermost electron shell (most chemical properties are dominated by the orbital location of the outermost electron).

Explanation:

Bond number

The characteristic of reactions that depends on valence electrons is the bond type.

In chemistry, a chemical bond could be;

Ionic

Covalent

The type of bond formed depends on the number of valence electrons present. When there are few valence electrons on an atom, it mostly forms ionic bonds.

When there are more electrons on an atoms, it mostly forms covalent bonds and the electrons between the atoms are shared.

Answer:

c the answer is c that is the answer

Answer:

I thinks something bad will happen but science can change so im not sure

Explanation:

Science changes because of diffrent thing like enviorment

Answer:

93.75

Explanation:

In first half life 750×1/2 will remain

In second one half from that remained at the end of first half life will remain

That is 1/2 × 750×1/2

likewise at the end of 3rd half life 1/2 × 1/2 ×750×1/2 remains

at the end of 4th half life 1/2 × 1/2 × 1/2 ×750×1/2 remains

1/2 × 1/2 × 1/2 ×750×1/2 = 93.75 remains.

You can also use the equation

Remainder = X × 1/2^n .

This saves time

n= no. of half lives

X= initial amount

so in this case 1/2^4 × 750 = 93.75

The concentration of [Ag+] present in the solution is 6.53 × 10⁻⁸ M

From the given information, the equation for the reaction between silver ion and ammonia can be represented as:

Ag⁺ + 2NH₃ ↔ [Ag(NH₃)₂]⁺

Given that the solubility constant (Ksp) for the product formed = 1.7 × 10⁷.

The solubility constant for this reaction can be expressed as:

[tex]\mathbf{Ksp = \dfrac{[Ag(NH_3)_2]^+}{[Ag^+][NH_3]^2} }[/tex]

where;

[tex]\mathbf{1.7 \times 10^7 = \dfrac{0.025}{(x)(0.15)^2}}[/tex]

[tex]\mathbf{1.7 \times 10^7 = \dfrac{1.1111}{x}}[/tex]

[tex]\mathbf{x = 6.54 \times 10^{-8} \ M}[/tex]

Therefore, we can conclude that the concentration of  [Ag+] = x = 6.54 × 10⁻⁸ M.

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Answer:

Al2 (SO4)3

2×27 + 3×(32+ 4×16)

54 + 3×(32+ 64)

54+ 3×(96)

54+ 288

=342g

BRAINLIST PLS

Answer:

Respiratory gas exchange

Explanation:

Answer:

From the given compounds MgO has the highest lattice energy.

The reactants and products parts of a chemical equation must be balanced.

A chemical reaction is said to be balanced when the number of atoms of each element on both sides of the equation are the same.

A chemical equation consists of the reactants and the products, hence, the number of atoms on both sides must be equal for the equation to be balanced.

Therefore, the reactants and products parts of a chemical equation must be balanced.

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When atoms and molecules speed up or slow down, that is a physical change. When they change state from liquid to solid or from gas to liquid, that is a physical change. ... The ions or molecules can still come back together to form the original substance

The physical change which happens to atoms and molecules in a solution that is strongly heated in a flame is;

Atoms and molecules which are units of matter when strongly heated in a flame have increased internal energy and would undergo a phase change to a more energetic state of matter which is the gaseous state.

As such, the physical change that occurs in them is. increased internal energy.

Read more on heating and Phase change;

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Can you please add a picture of the case??

Answer:

Gravitational potential energy - into Kinetic energy

Explanation:

Since electron orbitals are described as probability clouds, Einstein disagreement with the probable positions of electrons in the orbitals is that, It is not possible to know the orbit of an electron when the position is under probability.

According to Bohr's theory, it is difficult to locate electron or cannot be located in a definite region. Electron has to be found in an orbit and nowhere else. When the probability of finding an electron in a given spherical shell around the nucleus is plotted the distance of the electron from the nucleus for the hydrogen atom, the graph indicates that the probability of finding the electron increases as the distance between the electron and the nucleus decreases

Bohr claimed that electrons a entities had only probabilities if they weren't observed. While Einstein argued that they had independent reality.

But in wave mechanics Model, there is a slight chance of knowing the location of the electron.

Heisenberg uncertainty principle also claim the possibility of knowing the position of electron. Albert Einstein also claim that; to determine the position of an electron to an accurate extent, you would have to compromise your ability to know it's momentum. This inaccuracy will eventually affect the measurement of momentum which will be extremely uncertain.

Since electron orbitals are described as probability clouds, Einstein disagreement with the probable positions of electrons in the orbitals is that, It is not possible to know the orbit of an electron when the position is under probability.

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Answer:

complementary colour

Explanation:

The complementary colors are used for the light that is transmitted when complex ions absorb wavelength of visible light.

Complementary colors are color pairs that cancel each other whenever combined and mixed, resulting in a grayscale color either white or black. They offer the most contrast for the those two hues when put adjacent to each other. Colors that are complementary are sometimes known as "opposite colors."

Light, often known as visible light, is electromagnetic radiation that falls within the region of the electromagnetic spectrum which the human eye can perceive.

Therefore,  the complementary colors are used for the light that is transmitted when complex ions absorb wavelength of visible light.

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Answer:

The saline water should be from 1000 ppm to 3000 ppm while fresh water is less than 1000 ppm

Answer: