Why should we try to use less oil, natural gas and electricity?

Answer:

b- freezing water

Explanation:

Solid<liquid<gas is the general rule for entropy increase

Freezing water would change the phase from liquid to solid which would lead to less entropy

Answer: –1,267.2 kJ

Explanation: B on edge, thank me later ;-)

–1,267.2 kJ is the enthalpy of the given reaction. Therefore, the correct option is option A among all the given options.

Enthalpy is a thermodynamic system's internal energy total as well as the volume times pressure ratio. Enthalpy is a property or state function that resembles energy; it has the same dimensions as energy and is therefore measured in joules or ergs. The value of enthalpy is solely dependent on the temperature, pressure, as well as composition of the system, not on its history.

The shift in the internal energy equals equivalent to the heat transmitted to, much less than the jobs completed by, the system, in accordance with the principle of energy conservation. The enthalpy change is precisely equal to the heat transmitted to the system if the sole work performed is a change in volume at constant pressure.

ΔH = ΔH for product - ΔH for reactant

     = 3,572.1 kJ –1,267.2 kJ

    = –1,267.2 kJ

Therefore, the correct option is option A.

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Answer:

gravity pulls on the earth and putts it in orbit around the sun

Explanation:

Answer:

algebra

Explanation:

The parallax formula states that the distance to a star is equal to 1 divided by the parallax angle,  

p

, where  

p

is measured in arc-seconds, and  

d

is parsecs.

I'm positive that the answer is trigonometry.

Refer to the following passage that I got from the Edg assignment.

"How then do astronomers measure the distance of stars? The parallax, considered very accurate, is one method used by astronomers to measure the distances to nearby stars. The diameter of the earth’s orbit around the sun is about 300 million km. By observing a star one day and then again six months later, these scientists will be able to observe differences in the star the two times it was observed. Using trigonometry, these different angles yield the distance of how far away a star is."

Explanation:

taiga the largest land well forest

Answer:

1160mg

Explanation:

Molarity = number of moles ÷ volume

According to the information in the question, molarity = 1.25 M, volume = 18.0 mL = 18/1000 = 0.018L

M = n/V

n = M × V

n = 1.25 × 0.018

n = 0.0225moles.

Using mole = mass/molar mass, to find the mass of lithium phosphide (Li3P)

Molar mass of Li3P = 6.9(3) + 31 = 51.7g/mol

mole = mass/molar mass

0.0225 = mass/51.7

mass = 1.16grams.

In milligrams (mg), mass of Li3P = 1.16 × 1000 = 1160mg

Did you ever get the answer

Answer:

2 boron and 3 sulfur

Explanation:

The subscript/ number behind and under is a subscript this tells you how many atoms there are

Answer:

c,e,f

Explanation:

Judging by what i tried to find out about this reaction, it seems that won't take place, though it could be wrong.

Answer:

A) chlorine

Explanation:

To solve this question we can use:

PV = nRT

In order to solve the moles of the gas. With the moles and the mass we can find the molar mass of the gas to have an idea of its identy:

PV = nRT

PV / RT = n

Where P is pressure: 603mmHg * (1atm / 760mmHg) = 0.7934atm

V = 100mL = 0.100L

R is gas constant = 0.082atmL/molK

T is absolute temperature = 14°C + 273.15 = 287.15K

0.7934atm*0.100L / 0.082atmL/molK*287.15K = n

3.37x10⁻³ moles of the gas

In 0.239g. The molar mass is:

0.239g / 3.37x10⁻³ moles = 70.9g/mol

The gas with this molar mass is Chlorine, Cl₂:

Answer:

12.1-M requires less volume of stock solution.

Explanation:

Hello there!

In this case, according to the foundations of dilution processes, it turns out convenient to remember that the moles of the solute before and after the dilution remains the same; for that reason we use the following equation:

[tex]M_1V_1=M_2V_2[/tex]

Relating the initial and final molarities and volumes. Now, it is seen that V2 is 10.0 mL and M2 is 1.0 M, which means that if we solve for V1 for 12.1 M and 6.0 M, we obtain the following volumes:

[tex]V_1=\frac{M_2V_2}{M_1} \\\\V_1^{12.1M}=\frac{1.0M*10.0 mL}{12.1M}=0.826mL\\\\V_1^{6.0M}=\frac{1.0M*10.0 mL}{6.0M}=1.67mL[/tex]

Therefore, since the 12.1-M solution requires less volume of stock solution, it makes sense to use this one as the initial solution.

Best regards!

Answer:

There are 15 protons in phosphorous.

~Hoped this helped~

~Brainiliest?~

Answer:

2Ca + O₂ → 2CaO

Explanation:

Cuando el Calcio (Ca) reacciona con oxígeno (O₂) se produce cal (CaO). La cal es un sólido inodoro de color blanco a grisáceo. La cal es un óxido que se encuentra presente en el cemento y su cuantificación permite determinar la calidad y el tipo de cemento a utilizar.

La reacción que describe el proceso anterior es:

Ca + O₂ → CaO

Para balancear los oxígenos, se deben poner 2 CaO como producto:

Ca + O₂ → 2CaO

Para balancear los calcios, se pone como coeficiente del Ca un 2:

Esta última es la reacción que describe el proceso anterior

Answer:

The radioactive isotopes within these brains typically record the ages of the grains-not the time when the sedimentary rock was formed, making it difficult to date using radiometric dating. The half-life of U-235 is 704 million years.

Explanation:

hope this helps but if i'm wrong then i'm sorry..

Answer:

D

Explanation:

Very old rocks would be been formed before said isotopes with short half-lives. We're thinking of a very long geological time. The original rock might be rock C, then years and years later rock Y would be measured. Y can't match C since there's too much unknowns in between.

Answer:

40.7 kJ

Explanation:

Applying,

q = c'n.................. Equation 1

Where q = Thermal Heat, c' = Heat of vaporization of water, n = number of mole of water.

But,

n = mass(m)/Molar mass(m')

n = m/m'............... Equation 2

Substitute equation 2 into equation 1

q = c'(m/m')............. Equation 3

Given: c' = 40.650 KJ/mol, m = 18.02 g

Constant: m' = 18 g/mol

Substitute into equation 3

q = 40.650(18.02/18)

q = 40.695 kJ

q ≈ 40.7 kJ

Answer:

The isopropanol evaporated while the water did not because the molecules don't stick together as strongly as the molecules in the water do. The water would need more energy transferred in, in order to evaporate.

Explanation:

The isopropanol evaporates and the water does not because the heat capacity and the latent heat of isopropanol is far lesser than that of water.

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Aid is money given to students for education funding which may not be paid back.

The term aid may be used to refer to money given to a person for a particular purpose which the person may not be required to pay back. Often students are given this sort of assitance to fund their education.

Hence, grants given to students to finance their education which they may not pay back are called aid.

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Answer:

1) Hom DOMINANT

2) Hom recessive

3) Hetero DOMINANT

4) Hom DOMINANT

5) Hetero DOMINANT

6) Hom recessive

Explanation:

Answer:

2 moles H

2

Explanation:

Your tool of choice here will be the mole ratio that exists between zinc metal,  

Zn

, and hydrochloric acid,  

:HCl

, in the balanced chemical equation.

Zn

(s]

+

2

HCl

(aq]

→

ZnCl

2(aq]

+

H

2(g]

↑

⏐

You're dealing with a single replacement reaction in which zinc displaces the hydrogen from hydrochloric acid. The products of the reaction are aqueous zinc chloride and hydrogen gas.

Now, as you can see from the balance chemical equation, a  

1

:

2

mole ratio exists between the two reactants.

This tells you that in order for the reaction to take place, you need to have twice as many moles of hydrochloric acid as you do of zinc metal.

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http://people.springfield.k12.or.us/jim.tyser/chemcom/Resources/unit1ans.html

At the same time, you have a  

2

:

1

mole ratio between hydrochloric acid and hydrogen gas.

This means that the reaction will always produce half as many moles of hydrogen gas as you have moles of hydrochloric acid.

Since you know that  

4

moles of hydrochloric acid are taking part in the reaction, and assuming that you have enough zinc metal so that it doesn't act as a limiting reagent, you can say that the reaction will produce

4

moles HCl

⋅

1 mole H

2

2

moles HCl

=

2 moles H

2

Explanation:

Answer:

3.02 X1023 atoms Ag limol. - - 0.50 1 moles. 6.02241023 atoms.

Answer:

they reduce viral transmission

They prevent asymptomatic spread

You're protecting others from illness.

They're mandated by law in some states

They're good hygiene in general

Answer:

The answer should be 2 because to balance the equation you should have to change to equation to this; 2Al + 3Br2 => 2AlBr3, so that there is a total of 2 Aluminums and 6 Bromiums on either side of the equation.

Explanation:

In the given chemical equation, the coefficient of bromine is 2.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

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Answer:

Number one is the most acidic, the one in the middle is neutral, and number nine is alkaline.

Answer:

Multicellular organisms thus have the competitive advantages of an increase in size without its limitations. They can have longer lifespans as they can continue living when individual cells die. Multicellularity also permits increasing complexity by allowing differentiation of cell types within one organism.

Answer:I just want points

Explanation:because I need them for future questions