Usually , it takes very little time for a community to develop during primary succession False True


HELPS

Answer:

Chlorine,Argon

Explanation:

All the elements of group 18 and group 17

The periodic table depicts the various elements arranged based on the increasing order of their atomic numbers. Argon and chlorine will have more valence electrons than sulfur.

A valence electron is an electron of an atom present in the outermost shell that participates in bond formation. The valence electrons are the same in elements placed in the same group or family.

The number of valence electrons increases in a horizontal row called the period of the periodic table. As when one moves from left to right in a period the valence electron increases.

The number of valence electrons in a sulfur atom is 6, whereas in chlorine is 7 and in argon is 8. As chlorine and argon are placed after sulfur in a period will have more valence electrons.

Therefore, argon and chlorine have more valence electron than sulfur.

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Answer:

d

Explanation:

because it’s moving the most spots to the left

The acidity or alkalinity of a solution depends upon its hydronium ion concentration and hydroxide ion concentration. Here among the given solutions, the solution D has the highest pH. The correct option is D.

The pH of a solution is defined as the negative logarithm to the base 10 of the value of the hydronium ion concentration in moles per litre. The pH scale is introduced by the scientist Sorensen. It is more easy to express the concentration of H₃O⁺ using this method.

The equation used to calculate the pH of the solution is given as:

pH = -log[H₃O⁺]

For 0.1 M

pH = -log[0.1] = 1

For 0.01 M

pH = -log[0.01] = 2

For 0.001 M

pH =  -log[0.001] = 3

For 0.0001 M

pH =  -log[0.0001] = 4

So solution D has the highest pH which is 4.

Thus the correct option is D.

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Answer:

81 x as bright

Explanation:

The intensity of light is dependent on distance according to this simple equation:

(90/10)^2 = 9^2

                = 81

This was derived from the inverse-square law. Respectively a light that is 10 m away from you is 81 x as bright.

Answer:

15.772%

Explanation:

Answer:

3. 95%

Explanation:

Invertebrates make up over 95 percent of the Earth's animal species. For many years, invertebrates have been kept as pets, displayed in aquariums and zoos, used for research, and consumed.

Answer:

95% i took the test

Explanation:

Answer:

25.56066

Explanation:

hope this helps !!!!!!! and sorry if it doesn't help

Answer:

Explanation:

There are only two elements in the first period: hydrogen and helium. We can explain why there is less elements in the first row in modern theories of atomic structure.

Answer:

"Hydrogen and Helium". Hydrogen and Helium are the elements of the first period in the modern periodic table.

Explanation:

Answer:

i just feel rlly bad that you need it now, i cant help but all i can say is you got this mate

Answer:

A

Explanation:

lions only eat meat, antelopes are prey

Answer:

No. You can not simplify a coefficient of.

Explanation:

:)

Answer:

1. covalent

2. polyatomic ion

Explanation:

:)

Answer:

1) b

2)c

Explanation:

Answer:

Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy and slow down. They move closer to other gas molecules. Finally these molecules collect together to form a liquid.

Hopefully this helped :)

Answer:

Calculate the number of moles you have by taking the Mass / molar mass. if you have 1000 grams ; then 1,000 g / 151.001 g/mol = X g moles. Then multiply by Avogadros # = 6.022140857 × 10^23 molecules per g mole. The result is the # of molecules of MnSO4

Explanation: Hope this helps

Answer: N2F4

Explanation:(NF2)x2 = N2F2

The compound X has a molar mass of 104.01·gmol−1 and the following composition: element mass % nitrogen 26.93% fluorine 73.07%, then the molecular formula of X is N2F4.

Molecular formula is defined as a chemical formula that give the total number of atoms of each elements in each molecule of a substance.

It can also be defined as a phrase that specifies the number of atoms of each element in a complex molecule.

It represents the actual number of each atom in a molecules.

It tells us which atoms and how many of each types of atoms are present in a molecule.

NF2 x 2 = N2F4

Thus, the compound X has a molar mass of 104.01·gmol−1 and the following composition: element mass % nitrogen 26.93% fluorine 73.07%, then the molecular formula of X is N2F4.

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Answer:

B.

Explanation:

A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.

Answer:

Cu2+(aq) + 2OH-(aq) => Cu(OH)2(s)

Explanation:

Use of aqueous sodium hydroxide is a precipitation reaction to test for anions or cations. Aqueous sodium hydroxide in a precipitate test forms a insoluble precipitates along with some colors characteristics.

Aqueous sodium hydroxide (NaOH) when mixed with copper(II) (Cu2+) forms a blue precipitate. The formula is as follows:

Cu2+(aq) + 2OH-(aq) => Cu(OH)2(s)

Answer:

Calcium

Explanation:

is a silver-gray metal which takes its name from the Latin word calx, which means lime. It is the fifth most abundant element in the earth's crust and is widely distributed as limestone (CaCO3), quicklime (CaO) and calcium fluoride.

Alkaline earth metals are present on the left of the periodic table. Therefore, calcium is the alkaline earth metal is the components of quick lime​.

Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable.

The properties of metals are:

1.Since metals have free electrons that's why they can conduct electricity

2. Since atoms in metals are very closely packed in a definite crystal so these are solid. It is not brittle that is it can not be broken down easily

3. It does not react with water easily.

4.It is denser than water hence it sink in water.

The formula for quick lime is quicklime (CaO). The alkaline earth metal that is component of quick lime is calcium Ca. Quick lime is used in white washing.

Therefore, calcium is the alkaline earth metal is the components of quick lime​.

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Answer:

7.71 ×10²⁴ atoms (3 s.f.)

Explanation:

Please see the attached picture for the full solution.

☆ or number of atoms, or fundamental units

(this is sometimes written as number of particles)

Further explanantion:

(☆:) Here, we are looking at the number molecules since H₂ is a molecule.

1 mole of a substance is the amount of substance which contains the same number of particles. Thus, when using Avogadro's Constant, the units that we are looking at follows the units of the question. Then, look at what the question is asking for and answer accordingly.

The 2nd picture shows an example of another molecule, H₂O.

Some other examples would be:

1 mole of Na (an atom) --- 6.022 ×10²³ atoms

1 mole of CO₂ (a molecule) --- 6.022 ×10²³ molecules

1 mole of Na+ --- 6.022 ×10²³ ions

Thus, if we look at the 2nd image again, we can say that 1 mole of H₂O contains 6.022 ×10²³ molecules since H₂O is a molecule. However, if the question is asking for the number of atoms, it is not right to say that there are 6.022 ×10²³ atoms. Instead, there are 1.2044 ×10²⁴ H atoms and 6.022 ×10²³ O atoms, giving us a total of 1.8066 ×10²⁴ atoms in 1 mole of H₂O.

Answer:

0.17166666666

Explanation:

Answer:

New volume V2 = 1.7625 L

Explanation:

Given:

Old temperature T1 = 27°C = 27 + 273 = 300 K

Old volume V1 = 1.25 L

New temperature T2 = 150°C = 150 + 273 = 423 K

Find:

New volume V2

Computation:

V1 / T1 = V2 / T2

1.25 / 300 = V2 / 423

New volume V2 = 1.7625 L

Answer:

okie!

Explanation:

Answer:

ok i. d k u but thnaks for points ill follow u anyways lol

Explanation:

Option (1) represents the Lewis electron-dot diagram correctly containing nitrogen in the equation.

Lewis Structure is a very simplified representation of the valence shell electrons in a molecule.  It is used to show how the electrons are arranged around individual atoms in a molecule. Electrons are shown as "dots" or for bonding electrons as a line between the two atoms.

Valence electrons are given by hydrogen atoms = [tex]1\times3=3[/tex]

Valence electrons are given by nitrogen atom = [tex]5\times1=5[/tex]

Total valence electrons = 3 + 5 = 8

So, the calculation above is shown only the first option. So, (1) Lewis electron-dot diagram correctly represents the reactant containing nitrogen in the equation.

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Answer:

Haemoglobin is the red pigment which is present in our blood and helps in transporting oxygen to different parts of our body.

Hope it helps

Answer:

Haemeglobin is a red substance that has the function of transporting oxygen into the blood.

Explanation:

Answer:

1. Solid

2. atom

3. faster and farther apart

4.more freely moving than a solid

5.The amount of matte in an object

Explanation:

Answer:

1. Solid

2. Atom

3. Faster and farther apart

4. More freely moving than a solid

5. The amount of matter in an object.

Answer:

just to get points

Explanation:

Answer:

true

Explanation:

hope this helps, I took the test too