20 points to whoever can answer these 3 questions correctly
Pt. 2

Answer:

.D you have any idea

Explanation:

Sana makatulong

Answer:

In scientific ecology, climax community or climatic climax community is a historic term for a boreal forest community of plants, animals, and fungi which, through the process of ecological succession in the development of vegetation in an area over time, have reached a steady state.

Explanation:

Answer:

When iron is allowed to react with HCl,

It produces hydrogen and the release of hydrogen gas prevents the formation of ferric chloride.

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Answer:

3.11 is the pH of the solution

Explanation:

The ionised form of the acetic acid is the acetate ion. To solve this problem we need to solve H-H equation:

pH = pKa + log [A⁻] / [HA]

Where pH is the pH of the buffer

pKa = -log Ka  = 4.74

[A⁻] = Concentration of acetate ion = 0.002M * 2.3% = 4.6x10⁻⁵M

[HA] = Concentration of acetic acid = 0.002M *(100-2.3)% = 0.001954M

Replacing:

pH = 4.74 + log [4.6x10⁻⁵M] / [0.001954M]

pH = 3.11 is the pH of the solution

Answer:

It would tend to lose two electrons and form a +2 ion. Potassium is in the first column and therefore has 1 electron in its outermost shell. It would tend to lose one electron and form a +1 ion.

Answer: Ocean rise?

Explanation:

Answer:

submerging of low islands and coast lines

Explanation:

earth science climate change unit test

Answer:

12

Explanation:so the mean deviation is for the square and the square is for you so you keep the square and add it.

Answer:

1. mean: 7.78 median: 8 mode: 7

2. range: 9 interquartile range: 2 MAD: 4.5367

3. The range is about 4 times bigger than the interquartile range. The mean is around double the MAD.

Explanation:

Answer:

i think it's B

Explanation:

Answer:

I'm pretty sure it's the cell membrane

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: 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:

100

ddExplanation:

Tectonic plates are found in the oceanic and continental lithosphere. The splitting of Africa and the plate tectonics movement is similar to Pangaea as the latter was a large continent that also split.

Pangaea was a large continent in the early geological times that covered almost all the landmass of the earth. It was a supercontinent that underwent splitting after the continental plates started drifting apart, resulting in the formation of the now known continents.

The movement of the Nubian and the Somali plates of Africa is similar to that of the Pangaea as the continent is big and intact now but in the future, the plates will drift very apart, creating more smaller continents.

Therefore, the Pangaea event is similar to the plate tectonic movement of Africa.

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Answer:

pop, emotional, heart touching, freestyle and rap music is what I LOVE!!!!!

Answer:

Contact

Explanation:

As the speed of the particles increases, they move around more, which means they hit the sides of the container more.

Answer:

Explanation:

The first law of Thermodynamics is known as Conservation because it explains that energy is always maintained within a closed system and cannot be created or destroyed. Therefore, this is observed when there is no longer change in temperature in a system. Mainly because the energy is not being transferred to and from another system. Without this transfer of energy, the energy itself gets conserved within the system and the temperature no longer fluctuates.

Answer:

Organisms move and eat through their habitats. They adapt to the environment and can survive in the environment with their own behavior.

Explanation:

Organisms are of many types. Some lives on land, some lives in water while others are hybrid organisms which can survive in water as well as on land. The organisms body movement is dependent on its cell functioning. Every organism has different cell structures which help them to survive on the earth.

Answer:

Since the ions cannot move, ionic solids are non-conductors of electricity. When the solid is melted to a liquid, however, the ions are free to migrate. Therefore, ionic liquids are good conductors of electric current. A conductor is a substance capable of transmitting electricity and/or heat.

Explanation:

:)

No, [tex]PCI_3[/tex]  is not a good conductor.

Phosphorus trichloride is an inorganic compound with the chemical formula PCl3. A colourless liquid when pure, is an important industrial chemical, being used for the manufacture of phosphates and other organophosphorus compounds.

The liquid does not conduct electricity because of the lack of ions or mobile electrons.

Hence, no, [tex]PCI_3[/tex] is not a good conductor.

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Answer:

The vector sum of all forces that act upon an object

Answer: It would be A and C

Explanation: I did the test and got it right. Hope this helps!

Answer:

A + C

Explanation:

ur an amazing person have a great day :3

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Answer:

Yes, pure NaCl will precipitate out of the solution

Explanation:

The parameters of the NaCl solution and HCl mixture are;

The saturation of the NaCl solution = Saturated solution

The mass concentration of the NaCl solution = 317 g/L

The volume of the HCl added = 10 mL

The concentration of the HCl added = 13.0 M HCl

The volume of the saturated NaCl solution = 0.2 L

The molar mass of NaCl = 58.44 g/mol

The number of moles of NaCl per liter = (317 g/L)/(58.44 g/mol) = 7925/1461 moles ≈ 5.42 moles

The ionization of the molecules in solution are;

HCl (aq) + H₂O (l) → H₃O⁺ (aq) + Cl⁻ (aq)

NaCl (s) ↔ Na⁺ (aq) + Cl⁻ (aq)

The number of moles of the Cl⁻ ion from the HCl is 13 moles per liter, the number of moles of Cl⁻ ion from the saturated solution of NaCl is approximately 5.42 moles, therefore, ionic product I.P. of the solution of Cl⁻ ions is larger than the solubility product of the solution, [tex]K_{sp}[/tex] of the NaCl and according to Le C h a t e l i e r's principle, NaCl will precipitate out of the solution

Answer:

Chlorine

Explanation:

The tendency of an atom to attract electron is referred to as electronegativty. In the periodic table, electronegativity increases across the period from left to right and decreases down the group.

Following that trend, the element with the greatest electronegativty is;

Chlorine

The atom that has the strongest attraction for electrons in a chemical bond in the options is Chlorine.  

The tendency of an atom to attract electrons to itself is know as electronegativity.

The most electronegative element is fluorine.

Electronegativity increases across the period in the periodic table.

Electronegativity decreases down the group in the periodic table.

Examples of electronegative elements are mostly non metals like oxygen, fluorine, chlorine, etc.

Therefore, the atom that has the strongest attraction for electrons in a chemical bond is Chlorine.  

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Answer:

c) 242

Explanation:

you subtract 238-92= 146 then you add 146+90+4+2 that will give you 242

Answer:

166,600J

Explanation:

Kinetic energy (K.E), which is the energy due to motion of a body, can be calculated by using the formula;

K.E = 1/2 × m × v²

Where;

K.E = kinetic energy (joules)

m = mass of body (kg)

v = speed or velocity (m/s)

According to this question, the mass of the roller coaster is 833.0 kg while its velocity/speed is 20.0m/s.

K.E = 1/2 × 833 × 20²

K.E = 1/2 × 833 × 400

K.E = 1/2 × 333200

K.E = 166,600

Therefore, the kinetic energy of the roller coaster car is 166,600J.

Answer:

im assuming you need the balanced equation

Explanation:

Zn + MgCl2 = ZnCl2 + Mg

Answer:

it will mgcl2 + zn

Explanation:

Mg will replace zn from its salt solution

to form mgcl2

hope it helps

Answer:

mechanical energy to electrical energy to light energy