Please somone help me with a chemistry question brainliest to whoever answers correctly and 20 points

S denotes the ''number of shared electron pairs by an atom'', Hence, Silicon shares its 4 electrons with 4 Cl-atoms. Thus the Value of S is 4 in SiCl₄ .It is also known as covalency

The number of covalent bonds that a particular atom can make with other atoms in forming a molecule.

Covalent bond id formed by the sharing of electron between two atoms.

Hence, Silicon shares its 4 electrons with 4 Cl-atoms. Thus the Value of S is 4 in SiCl₄ . It is also known as covalency

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Answer:

a formula giving the number of atoms of each of the elements present in one molecule of a specific compound.

Answer ; try to understand in the explanation

Explanation: Molecular Formula Definition: An expression which states the number and type of atoms present in a molecule of a substance. Examples: There are 6 C atoms and 14 H atoms in a hexane molecule, which has a molecular formula of C6H14.

The molar mass of cholesterol = 386.654 g/mol = 387 g/mole

3.2 mg cholesterol x 1 g/1000 mg x 1 mole/387 g x 6.02x1023 molecules/mole = 5.0x1018  molecules.

The mass in grams of one molecule of cholesterol, C27H46O is 6.43×10⁻²² g

6.02×10²³ molecules = 1 mole of Cholesterol

But,

1 mole of Cholesterol = 387 g

Thus,

6.02×10²³ molecules = 387 g mole of Cholesterol

6.02×10²³ molecules = 387 g mole of Cholesterol

1 molecule = 387 / 6.02×10²³

1 molecule = 6.43×10⁻²² g of Cholesterol

Thus, the mass of 1 molecule of cholesterol is 6.43×10⁻²² g

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Answer:

8 OH⁻(aq) + Mn(s) ⇒ MnO₄⁻(aq) + 4 H₂O(l) + 7 e⁻

Explanation:

Let's consider the following oxidation half-reaction that takes place in basic aqueous solution.

Mn(s) ⇒ MnO₄⁻(aq)

First, we will perform the mass balance. We will add 4 H₂O to the products side and 8 OH⁻ to the reactants side.

8 OH⁻(aq) + Mn(s) ⇒ MnO₄⁻(aq) + 4 H₂O(l)

Finally, we will perform the charge balance by adding 7 electrons to the products side.

8 OH⁻(aq) + Mn(s) ⇒ MnO₄⁻(aq) + 4 H₂O(l) + 7 e⁻

Answer:

B

Explanation:

because mass of an electron is 1/2000.

The statement about the mass of an electron which is correct is: B. The mass of an electron is less than the mass of the proton.

An atom refers to a smallest, indivisible unit that comprises the matter that forms all chemical elements. Therefore, atoms are typically considered as the fundamental building blocks of matter which determines the structure of a chemical element.

Basically, an atom consists of three (3) distinct particles and these include;  

Electrons are the subatomic particles of a chemical element that are negatively charged with a magnitude of -1.

On the other hand, protons can be defined as the subatomic particles of a chemical element that are positively charged.

All of these subatomic particles of a chemical element has a mass. However, the mass of an electron is significantly less than the mass of proton, as a result of its extremely small size.

In conclusion, the mass of an electron is approximately 2000 times smaller than that of a proton and as such contributes almost nothing to the total mass of an atom.

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Organic fertilizers are made from mined rock minerals, and natural plant and animal materials. They include ingredients like manure, guano, dried and powdered blood, ground bone, crushed shells, finely pulverized fish, phosphate rock, and wood.

Inorganic fertilizer is synthetic, comprised of minerals and synthetic chemicals. Most of the minerals in inorganic fertilizer are mined from the earth, and balanced inorganic fertilizers are high in all three macronutrients and can contain ammonium sulfate, magnesium sulfate, and potassium chloride.

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Answer:

pentene-alkanes-C5H10

octane-alkanes-C 8H 18

butene-alkene-c4h8

decane-alkane-c10h22

Answer:

Bueno al principio pero empeorando con el paso del tiempo.

Explicación:

La calidad del aire es buena al inicio de la pandemia y hay menos infección en el aire pero con el paso del tiempo la infección se propaga a un ritmo más rápido y la calidad del aire se contamina con la infección que infecta a más personas. La pandemia reduce su intensidad cuando la gente sigue las reglas saludables que previenen la propagación de la pandemia en esa localidad por lo que podemos decir que la última semana de pandemia tiene menor número de pacientes.

Answer:

Bonding property

Explanation:

Distillation deals with boiling solutions. Therefore the boiling point has a major part to play. Boiling point of a substance deals with the type of bonds present. For example water has hydrogen bonding which is a weak intermolecular force therefore the boiling point of water isn't that high. If we were to focus on an ionic compounds the boiling point would be higher because ionic compounds have ionic bonding which are stronger bonds which therefore requires more energy to break those bonds therefore a higher boiling point.

In this case for the ethanol to distill the property it's focusses on is the bonds. The strength of the bonds really.

Answer:

72.2 moles of water is spilled

Explanation:

as moles=mass/mr

so mr of water is 16+2=18

13000/18=72.2

for the second one you can work out the moles of o2

by using moles= number of particles /6.02*10^23

so 4.65*10^26/6.02*10^23

so i got 772.4 on my calculator  to work out the amount of mass

u use the equation mass=moles*mr

so 777.2*16=12435g of oxygen gas

hope it helps :)

Answer:

ask someone else I will help later

Answer:

AgNO 3 = 3.25 mol AgNO × 6.02 × 10 23 f.

Answer:

1.96 x 1024

Explanation:

Answer:

[tex]Kc\frac{(Ba3N2)(H2O)^6}{(Ba(OH)2)^3(NH3)^2}[/tex]

Explanation:

Because kc equals products/reactants hope this helps :)

Answer:

require oxygen

Explanation:

Answer:

Lead can harm production of blood cells and the absorption of calcium needed for strong bones and teeth, muscle movements, and the work of nerves and blood vessels. High lead levels can cause brain and kidney damage.

thanks

Once lead enters the body, it is distributed to organs such as the brain, kidneys, liver and bones. The body stores lead in the teeth and bones where it accumulates over time. Lead stored in bone may be remobilized into the blood during pregnancy, thus exposing the fetus.

Answer:

Explanation:

What is the "theoretical yield" of cookies from each of the "reactants?"

Theor. yield from eggs

=

12

eggs

×

24 cookies

1

egg

=

288 cookies

Theor. yield from vanilla

=

24

tsp vanilla

×

24 cookies

1

tsp vanilla

=

576 cookies

Theor. yield from salt

=

82

tsp salt

×

24 cookies

0.5

tsp salt

=

3936 cookies

Theor. yield from baking soda

=

84

tsp baking soda

×

24 cookies

0.5

tsp baking soda

=

4032 cookies

Theor. yield from chocolate chips

=

3

cups chocolate chips

×

24 cookies

1.333

cups chocolate chips

=

54 cookies

Theor. yield from sugar

=

11

cups sugar

×

24 cookies

0.5

cup sugar

=

528 cookies

Theor. yield from brown sugar

=

4

cups brown sugar

×

24 cookies

0.5

cup brown sugar

=

192 cookies

Finally, "we leave it as an exercise for the student" to calculate that

Theor. yield from margarine = 72 cookies

b. Identify the limiting reactant

The limiting reactant is the amount of chocolate chips because they can produce the smallest amount of cookies.

c. Determine the theoretical yield

The theoretical yield is 54 cookies, because that is all you can get from the chocolate chips provided.

The percent yield obtained on baking the cookies is 20 % and the theoretical yield is 25 cookies.

Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.

In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .

As cookies obtained is 5 it is observed yield while 25 is theoretical yield so the percent yield, 5/25×100=20%.

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Answer:

C

Explanation:

When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air.

Burning fossil fuels, such as coal, oil, and natural gas, releases various pollutants into the atmosphere. The correct answer is C. Pollution is released into the atmosphere.

Burning fossil fuels involves the combustion of carbon-based compounds, such as hydrocarbons, present in these fuels. When these fuels are burned, they react with oxygen in the air, releasing energy in the form of heat and producing combustion byproducts.

One significant effect of burning fossil fuels is the release of pollution into the atmosphere. Carbon dioxide (CO₂) is the primary greenhouse gas emitted during the combustion process. It contributes to the greenhouse effect, trapping heat in the Earth's atmosphere and leading to global warming and climate change. These pollutants include carbon dioxide (CO₂), sulfur dioxide (SO₂), nitrogen oxides (NOx), particulate matter, and other harmful substances. These pollutants contribute to air pollution and can have negative effects on human health, ecosystem health, and climate change.

Hence, the correct option is option c.

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Answer:

I got 1.14 mol So3 as the answer

hopefully if this could help

Answer:

b. 0.8 M

Explanation:

Based on the reaction, Keq is defined as:

Keq = 4.0 = [P2X] / [X]

As P is a pure solid, its concentration is not taken into account

The initial concentration of X is 1.0mol/L = 1M, the equilibrium concentrations are:

[X] = 1M - X

[P2X] = X

Where X is the reaction coordinate

Replacing:

4.0 = X / 1-X

4.0 - 4.0X = X

4.0 = 5.0X

0.8M = X = [P2X]

Right answer is:

Answer:

Explanation:

Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital. This results in a larger atomic radius.

Answer:

answer is a

Explanation:

i hope this helps you

Answer:

One of the most important things we can do with heat is to use it to do work for us. A heat engine does exactly this—it makes use of the properties of thermodynamics to transform heat into work. Gasoline and diesel engines, jet engines, and steam turbines that generate electricity are all examples of heat engines.

[tex][\text{H}^{+}] = 10^{-\text{pH}}[/tex]

[tex][\text{H}^{+}] = 10^{-1.65}[/tex]

[tex]\boxed{[\text{H}^{+}] = 2.2 × 10^{-2} \: M}[/tex]

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Answer:

synthesis reaction

Explanation:

the mixture of the chemical are not correct

triamminechloroplatinum(II) nitrite

Answer:

780 watts

Explanation:

formula to find power when given amps and voltage

P = A x V

=6.50a x 120V

= 780 W (watts)

Answer:

cvbn

Explanation:

Answer:

Al + O2 ------> Al + 2O

Explanation:

hope this helps :)

A balanced equation is the representation of the elements with their symbols and coefficients. The balanced reaction for aluminum oxide is 2Al₂O₃ → 4Al + 3O₂.

A balanced equation represents the chemical elements along with their coefficients. The reactants are written on the left side while the products of the reaction are written on the right side of the arrow.

The balanced equation for decomposition reaction for aluminum oxide as,

The unbalanced equation is,

Al₂O₃ → Al + O₂

Oxygen atoms are balanced on both sides of the equation as,

2Al₂O₃ → Al + 3O₂

Now, the number of aluminum is balanced on both sides as,

2Al₂O₃ → 4Al + 3O₂

Therefore, the balanced equation is 2Al₂O₃ → 4Al + 3O₂.

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Answer:

BaBr2 (aq) + H2SO4 (aq) → BaSO4 (s) + 2 HBr (aq)

Explanation:

This is a precipitation reaction: BaSO4 is the formed precipitate.