Please help me it due to at 6:00pm will mark the brainiest and more points please help me really need help please

Answer:

One sigma bond and two pi bonds.

Explanation:

Triple covalent bonds between two atoms are created when they share three electron pairs. Three dashes connecting the atoms signify a triple bond. Pnictogen or the nitrogen family of atoms are those having triple valency. The correct option is C.

Two pi bonds and one sigma bond make up a triple bond. One sigma bond and one pi bond make up a double bond. Sigma bonds are usually made up of one atom. A single bond is described as a two-valence electron chemical bond between two atoms.

Covalent bonds with overlapping atomic orbitals fall under the categories of sigma and pi bonds. While pi bonds are created by the lateral overlapping of two atomic orbitals, sigma bonds are created by the head-to-head overlapping of atomic orbitals.

Thus the correct option is C.

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Answer:

The density.

Explanation:

The density is an intensive property of fluids, defined as mass divided by volume.

This property is directly related to the intermolecular forces that are present in the substance: the stronger the intermolecular forces, the higher the density will be, and viceversa. Therefore, organic fluids usually have lower densities than water, because the intermolecular forces in organic fluids are not as strong as in the intermolecular forcer in water (water has very stable hydrogen bonds, whereas organic fluids have van der Waals, weaker than hydrogen bonds).

The liquid that has the lower density will be the the liquid that is on the top layer. In this case, the organic compound tert-butyl methyl ether will be on top of water.

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question we have

[tex]density = \frac{163}{2500} \\ = 0.0652[/tex]

We have the final answer as

Hope this helps you

Answer:

Density= mass/volume so 163/2500 = 0.0652

D= 0.0652

Explanation:

Answer:

[H₃O⁺] = 0.7M

[SO₄²⁻] = 0.3M

Explanation:

The HCl in solution produce 1mole of H₃O⁺ and H₂SO₄ produce 2 moles of H₃O⁺.

When two solutions are mixing in equal volumes, the concentrations of both reactants is halved regard to their initial concentrations. That is:

HCl = 0.1M

H₂SO₄ = 0.3M

And H₃O⁺ will be:

0.1M + 2*0.3M = 0.7M

And SO₄²⁻ comes just from H₂SO₄, that means:

[H₂SO₄] = [SO₄²⁻] = 0.3M

protons

there aint rlly an explanation tbh

Answer:

Nucleons

The mass number of a nucleus is the number of protons and neutrons called the nucleons! Nucleons are the sum of protons and neutrons present in the nucleus of an atom.

Answer:

Ammonia is a weak electrolyte, weak base.

Option e.

Explanation:

Ammonia can take a proton from water to make ammonium.

It is a base, because it takes proton.

When a compound can take protons, we know that is base, according to Bronsted Lowry theory.

We can't describe ammonia as a base, according to Arrhenius, but we know it is base according to Lewis, because the N from the ammonia can be a donor of its electron pair.

It is weak because an small amount of ammonia, can react to produce ammonium, between the protons of water. This is the equilibrium, where the ammonia is considered as the conjugate strong acid of ammonia.

NH₃ +  H₂O  ⇄  NH₄⁺  +  OH⁻     Kb

All the amines are considered as weak bases, because they look like ammonia, where the H of NH₃ are replaced by others chains.

------NH₂

-----NH-----

Answer:

C. Speed

Explanation:

Density differences in different materials are able to change the speed of a wave.

Answer:

Speed

Explanation:

The speed or mass of something can totally change the direction of the wave

Answer:

you tell me

Explanation:

Answer:

3HCl(aq)+Al(OH)3(s)=AlCl3(aq)+3H2O(l)

Explanation:

This is a double replacement reaction.

Step One: Write down the compound from the name.

Aluminum Hydroxide Al(OH)3

Hydrochloric Acid HCL

Step Two: Perform the double replacement reaction.

AB+CD=AD+CB

Step Three: Balance the equation

Final step: Write in physical states.

The physical state will either be (aq), (s), (l) or (g).

Answer:

3.6 x 10²²molecules

Explanation:

Given parameters:

Mass of ethane gas  = 1.8g

Unknown:

number of molecules of ethane gas = ?

Solution:

To solve this problem, we first find the number of moles of ethane gas.

  Molar mass of ethane, C₂H₆  = 2(12) + 6(1) = 30g/mol

 Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

Insert the parameters and solve;

  Number of moles  = [tex]\frac{1.8}{30}[/tex]   = 0.06mole

 1 mole of a substance contains 6.02 x 10²³ molecules

 0.06mole of ethane will contain 0.06 x 6.02 x 10²³  = 3.6 x 10²²molecules

Answer:

Chemical change

Explanation: Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.

Answer:

True,

Explanation:

doesn't have ends like chromosomes of eukaryotic organisms

so all bacteria contains chromosomes yes, 100%

can i have brainliest i need 2 more to get a new rank tysm

Answer:

Volume of methanol present in solution = less than 3 ml

Explanation:

Given:

Volume of solution = 750 ml

Find:

Volume of methanol present in solution

Computation:

Volume of methanol present in solution = Volume of solution x 0.4%

Volume of methanol present in solution = 750 ml x 0.4%

Volume of methanol present in solution = 3 ml

Volume of methanol present in solution = less than 3 ml

The amount of methanol present in the 750 mL solution is 3 mL

From the question given above, the following data were obtained:

Percentage of methanol = 0.4%

Volume of solution = 750 mL

The volume of methanol present in the 750 mL of solution can be obtained as follow:

Volume = Percent × Volume of solution

Volume of methanol = 0.4% × 750

Volume of methanol = 0.004 × 750

Thus, the amount of methanol present in the 750 mL solution is 3 mL

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The electron configuration of Sodium (Na) : 1s²2s²2p⁶3s¹

Sodium is an element with the symbol Na and has the atomic number 11. It is located in Group 1 (alkaline) and period 3

atomic number=number of electron=11

In an atom there are levels of energy in the shell and sub shell  

This energy level is expressed in the form of electron configurations.  

Charging electrons in the sub shell uses the following sequence:  

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.  

So the electron configuration for Natrium ( with 11 electrons) :

1s²2s²2p⁶3s¹ or we can write [Ne] 3s¹

Answer:

The moon is required to make a wave.

Answer:

A & B

Explanation:

Done the Quiz

Explanation:

Given reaction:

           ¹⁰⁸₅₃I   →  ⁴₂He   +  ?

 An alpha particle decay requires that the mass number decreases by 4 and atomic number decreases by 2.

This reaction is called  nuclear fission;

  The unknown compound, say Y, will have mass number and atomic number shown below;

               ¹⁰⁸₅₃I   →  ⁴₂He   +  ᵃₙY

Mass number;                  108  =  4 + a

                                               a = 104

Atomic number ;

                                            53  = 2 + n

                                               n = 51

   Y will be      ¹⁰⁴₅₁Y

The atomic number of the new element is 51; so, it is antimony.

               ¹⁰⁴₅₁Sb

Answer:

well gravity

Explanation:

gravity pull everything to earth

Answer:

yes the picture is not clear

Answer:

pOH = 4

Explanation:

NaOH is a strong base which means that it dissociates completely in water. It will break apart into Na⁺ and OH⁻ ions.

NaOH ⇒ Na⁺ + OH⁻

Because NaOH dissociates completely into its respective ions in water, the moles of NaOH is equal to the moles of hydroxide ions. So, [OH⁻] = 0.0001 M.

Now to find the pOH, use the formula pOH = -log[OH⁻].

pOH = -log[OH⁻]

= -log(0.0001)

= 4

The pOH of the solution is 4.

Hope that helps.

Answer:

no evidence of how to do the anwsers sorrry.

Explanation:

Answer: 90

Explanation: Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. When water is heated, the molecules gain energy and, thus, move faster. As they move faster, they come into contact with the sugar more often, causing it to dissolve faster.

Answer:

90 c

Explanation:

The sugar dissolve in the hottest bc of the heat it will melt in with the water i an pretty sure

Answer:

A.

Explanation:

hope this helped sorry if its wrong!

Answer:

24.5g

Explanation:

Given parameters:

Mass of oxygen gas = 21.8g

Unknown:

Mass of water  = ?

Solution:

This problem deals with the decomposition of water;

    Reaction equation;

                  2H₂O →  2H₂  +  O₂

2 mole of water will produce 1 mole of oxygen gas

First find the number of mole of the oxygen gas given;

          Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

    molar mass of O₂   = 2(16) = 32g/mol

  Number of moles of O₂  = [tex]\frac{21.8}{32}[/tex]   = 0.68moles

    1 mole of oxygen gas will be produced from 2 mole of water

     0.68moles of oxygen gas will be produce from  0.68 x 2 moles of water;   = 1.36moles of water

Mass of water = number of moles x molar mass

  Molar mass of water = 2(1) + 16  = 18g/mol

Mass of water  = 1.36 x 18  = 24.5g

Answer:

2.68

Explanation:

Step 1: Calculate the molar concentrations of the solutes

We will use the following expression.

M = mass of solute / molar mass of solute × liters of solution

[HF] = 15.0 g / 20.01 g/mol × 2.0 L = 0.37 M

[NaF] = 10.0 g / 41.99 g/mol × 2.0 L = 0.12 M

Step 2: Calculate the pH of the solution

We have a buffer system formed by a weak acid (HF) and its conjugate base (F⁻ coming from NaF). We can calculate the pH of the solution using Henderson-Hasselbach equation.

pH = pKa + log [F⁻]/[HF]

pH = 3.17 + log (0.12 M/0.37 M)

pH = 2.68

The pH of the resulting solution is 2.68.

pH is potential hydrogen. It is the measurement of the acidity and basicity of any solution.

Step 1: Calculate the molar concentrations of the solutes

M = mass of solute / molar mass of solute × liters of solution

[tex]\rm [HF] = \dfrac{15.0 g}{20.01 g/mol } \times 2.0 L = 0.37 M[NaF] = \dfrac{10.0 g}{ 41.99 g/mol} \times 2.0 L = 0.12 M[/tex]

Step 2: Calculate the pH of the solution

pH = pKa + log [F⁻]/[HF]

pH = 3.17 + log (0.12 M/0.37 M)

Thus, the pH of the resulting solution is 2.68

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Mol of Kr gas = 1.244

In general, the gas equation can be written  

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08205 L.atm / mol K  

T = temperature, Kelvin  

P=1.31 atm

V=23.3 L

T=26+273=299 K

mol of sample :

[tex]\tt n=\dfrac{PV}{RT}=\dfrac{1.31\times 23.3}{0.08205\times 299}=1.244[/tex]

Answer:

More rainfall is the correct answer.

Explanation:

a-pe/x

Answer:

unconsolidated material that contains nutrient matter and weathered rock

Explanation:

Earth's crust is made up of many layers. The top is soil, which provides the most nutrients for plants, like hummus( The organic nutrient for soil, form from the decaying of plants and animals)

The soil gets its texture from the bedrock, the bottom layer, which weathers, and goes into the soil.

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