(a) Explain the process by which these dark lines are generated by the elements in the sun's atmosphere.
Specifically, why are they black and not colored, and why do they match the colored line spectra of
those elements?

Answers

Answer 1

These substances absorb black body radiation energy at a very particular wavelength of light that is particular to them. The black (absorption) line is the result of energy being absorbed from the spectrum when an electron jumps from an orbit with low energy to an orbit with high energy.

Why dark lines appear in the absorption spectra?A substance's light transmission spectrum that displays black bands or lines where light has been absorbed by atoms, generating a dip in the spectrum, is called an absorption spectrum. By descending the energy ladder, electrons produce an emission spectrum.Some of the light at specific wavelengths is scattered when it travels through the atmosphere's gas, producing darker bands. The wavelengths of light released when common materials were heated to form lines that became known as "spectral lines" were recorded.

To learn more about : Absorption spectra

Ref : https://brainly.com/question/10252035

#SPJ9


Related Questions

3. Which sample has the highest average kinetic
energy?
a) 200 grams of water at 10 °C
b) 50 grams of water at 100 °C
c) 100 grams of water at -20 °C
d) 25 grams of water at 50 °C

Answers

The temperature of a substance is directly related to its kinetic energy. Because kinetic energy is the energy a substance has because of its molecules being in motion, as a substance absorbs heat its molecules move faster, thereby increasing the substance's kinetic energy.

From this we can get that 50 grams of water at 100 °C will have highest average kinetic energy then 25 grams of water at 50 °C will have slightly less kinetic energy then 200 grams of water at 10 °C and then 100 grams of water at -20 °C

What is Average kinetic energy ?

This implies that RMS speed and temperature also have a relationship. The average kinetic energy (K) is determined by multiplying the RMS speed (vrms) by the square of the mass (m) of each gas molecule.

The average kinetic energy of a substance's particles directly relates to the substance's Kelvin temperature. For instance, the average kinetic energy of the particles in a sample of hydrogen gas at 200K is twice that of the particles in the same sample at 100K.

Learn more about Average kinetic energy here:

https://brainly.com/question/26080657

#SPJ13

describe gravity to a 3rd grader

Answers

Answer:

you know how when you jump, you don't go flying away, that's because of a thing called gravity, it keeps everyone from floating into the sky.

Answer: if you were jumping on the bed you don’t just fly off right?! That’s crazy! Gravity keeps us from falling of the earth!

Explanation:

PLEASE ANSWER I am begging seriously
A student pipettes 5 ml of vinegar into a erleyenmeyer flask, adds indictator and 25 ml of distilled water and titrates it with 0.1098M naoh. calculate the concentraion of acetic acid in the vinegar if the intitial volume reading on the burrette was 1.35 ml and the final reading is 37.83ml

Answers

The calculated concentration of the acetic acid neutralized is 0.134 M.

What is the concentration ?

In this case, the task that we have is to obtain by calculation what would be the concentration of the acetic acid that is need to neutralize  0.1098M of sodium hydroxide solution.

Given that;

Total volume of the vinegar = 5 ml + 25 mL = 30 mL

Molarity of the sodium hydroxide =  0.1098M

Volume used for neutralization = 37.83ml -  1.35 ml = 36.48 mL

Applying the relation;

CAVA/CVB = NA/VB

CAVANB = CBVBNA

CA= CBVBNA/VANB

CA = 0.1098 * 36.48  * 1/30 * 1

CA = 0.134 M

Learn more about concentration:brainly.com/question/10725862

#SPJ1

What could cause bond angles to differ between molecules ?

Answers

• We need to take into consideration that many factors lead to variations from the ideal bond angles of a molecular shape. Size of the atoms involved, presence of lone pairs, multiple bonds, large groups attached to the central atom,

• In this instance,, Option 2,3,4, are applicable in order to cause bond angles to differ between molecules.

Water can be made using the reversible reaction shown. Which change would
keep this reaction from shifting to form more of the product?
2H₂+022H₂O + energy
A. Increasing the concentration of H₂ gas in the reaction vessel
B. Decreasing the temperature in the reaction vessel
C. Removing the H₂O from the reaction vessel as it forms
D. Increasing the temperature in the reaction vessel

Answers

Decreasing the temperature in the reaction vessel keep this reaction from shifting to form more of the product.

As we know that rate of reaction is directly proportional to the concentration of the reactant.

If we increase the concentration of H2 then the rate of reaction increases. So, we keep it constant. Therefore this option is wrong.

By removing the H₂O from the reaction vessel as it almost make no change in the reaction. This can be pursuited the reaction in which product again converted into product.

By increasing the temperature we increases the rate of reaction and equilibrium shift in the forward direction.

Thus, we concluded that by decreasing the temperature in the reaction vessel keep this reaction from shifting to form more of the product.

learn more about rate of reaction:

https://brainly.com/question/8592296

#SPJ13

Atoms of nonmetals react with both metals and other non metals
A. true
B. False

Answers

I think that it is A. True

(b) Calculate the number of moles of magnesium and sulfuric acid that reacted.

Answers

Answer

The moles of Mg that reacted = 0.005 moles

The moles of H₂SO₄ that reacted = 0.005 moles.

Justification: The mole ratio from the balanced equation is 1 : 1 and since the moles of H₂SO₄ (0.005 mol is less than 0.020571898 mol of Mg) is the limiting reactant, it determines when the reaction goes into completion.

Explanation

Given:

Mass of magnesium that reacts = 0.50 g

The volume of sulfuric acid that reacts = 25 cm³

Molarity of sulfuric acid that reacts = 0.20 moldm⁻³

What to find:

The number of moles of magnesium and sulfuric acid that reacted.

Step-by-step solution:

Step 1: Write the balanced chemical equation for the reaction.

Mg + H₂SO₄ → H₂ + MgSO₄

Step 2: Convert the mass of Mg and molarity of H₂SO₄ to moles.

The mass of Mg can be converted to moles using the mole formula:

[tex]\begin{gathered} Moles=\frac{Mass}{Molar\text{ }mass} \\ \\ Molar\text{ }mass\text{ }of\text{ }Mg=24.305\text{ }g\text{/}mol \\ \\ Moles=\frac{0.50\text{ }g}{24.305\text{ }g\text{/}mol}=0.020571898\text{ }mol \end{gathered}[/tex]

25 cm³ of 0.20 moldm⁻³ of H₂SO₄ can be converted to moles using the formula for molarity:

[tex]\begin{gathered} Molarity=\frac{Moles}{Volume\text{ }in\text{ }dm^3} \\ \\ Moles=Molarity\times Volume\text{ }in\text{ }dm^3 \\ \\ Moles=0.20\text{ }moldm^{-3}\times0.025\text{ }dm^3 \\ \\ Moles=0.005\text{ }mol \end{gathered}[/tex]

Step 3: Calculate the number of moles of magnesium and sulfuric acid that reacted.

From step 2: moles of Mg = 0.020571898 mol, moles of H₂SO₄ = 0.005 mol

Using the mole ratio of Mg and H₂SO₄ from the balanced equation in step 1, that 1 mol Mg = 1 mol H₂SO₄

Therefore, the moles of Mg that reacted will be 0.005 moles, and the moles of H₂SO₄ that reacted will be 0.005 moles.

Justification: The mole ratio from the balanced equation is 1 : 1 and since the moles of H₂SO₄ (0.005 mol is less than 0.020571898 mol of Mg) is the limiting reactant, it determines when the reaction goes into completion.

Multiple choice

_______ is mechanical breakdown of food while _________breakdown occurs in the intestines.

A:chewing and chemical


B:chemical and mechanical


C:mouth and gut

Answers

Answer: A: Chewing and chemical

Explanation:

Chewing is mechanical being that chemicals are not breaking down anything your teeth are.  

Calculatetheamountofiron(III)oxideina74gsample.

Answers

Answer

0.46 moles

Explanation

Given:

Mass of iron (III) oxide sample = 74 g

What to find:

The amount (mole) of iron (III) oxide in a 74 g sample.

Solution:

The amount (mole) of iron (III) oxide in a 74 g sample can be calculated using the mole formula.

[tex]Mole=\frac{Mass}{Molar\text{ }mass}[/tex]

Using the molar masses of Fe = 55.845 g/mol, and O = 15.999 g/mol.

The molar mass of Fe2O3 = (2 x 55.845) + (3 x 15.999) = 159.687 g/mol

Putting mass = 74 g and molar mass = 159.687 g/mol, the amount will be

[tex]Mole=\frac{74\text{ }g}{159.687\text{ }g\text{/}mol}=0.463406539\text{ }mol[/tex]

Therefore, the amount of iron (III) oxide in a 74 g sample is approximately 0.46 moles.


N₂ (g) + 3H₂(g) → 2NH3(g)

If 18.2 kg N₂ is mixed with 4.50 kg H₂, and 19.8 kg of NH3 is collected.

(a) Which reactant is the limiting reagent?
(b) How many kilograms of the excess reagent left?
(c) What is the percent yield of NH3

Answers

(a) Therefore the limiting reagent is N2.

(b) The kilograms of excess reagent left = 0.5709 kg.

(c) % Yield = 89.475 %.

Given reaction is

N2(g) + 3H2(g) ------> 2NH3(g)

mass of N2=18.2 kg=18.2 x 103 g (Since 1 kg=1000 g)

Molar mass of N2=28.0134 g/mol

Moles of N2=mass/molar

mass = (18.2 x 103 g)/(28.0134 g/mol) = 649.689 mol.

the mass of H2 = 4.5 kg = 4.5 x 103 g = 4500 g

The molar mass of H2 = 2.01588 g/mol

Moles of H2 = (4.5 x 103 g )/(2.01588 g/mol) = 2232.276 mol.

As per the balanced equation, the mole ratio between N2:H2 = 1:3.

But here N2:H2 = 649.689: 2232.276  = 1:3.436

That means H2 is in excess.

(a) Therefore the limiting reagent is N2.

(b) The actual moles of H2 required = 3 x mol of N2 used = 3 x 649.689 mol = 1949.067 mol.

Mass of H2 required = moles x molar mass = 1949.067 mol x 2.01588 g/mol = 3929.085 g.

The excess mass of H2 present = 4500 g - 3929.085 g = 570.91 g = 0.5709 kg.

The kilograms of excess reagent left = 0.5709 kg.

(c) The theoretical yield of NH3 = 2x moles of N2 used = 2 x 649.689 mol = 1299.378 mol.

The molar mass of NH3 = 17.03052 g/mol

Therefore theoretical yield of NH3 =moles x molar mass = 1299.378 mol x 17.03052 g/mol = 22129.08 g

Theoretical yield of NH3 =22.129 kg

Given the experimental yield of NH3 = 19.8 kg.

Therefore,

% Yield = (Experimental yield)/(Theoretical yield ) x 100

% Yield=(19.8 kg/22.129 kg) x 100=89.475 %.

% Yield=89.475 %.

What is Reactant?

Reagent or analytical reagent is a substance or compound that is added to a system to produce or test a chemical reaction as it occurs. The terms reactant and reactant are not often used interchangeably, but a reactant defines a substance that is used up in  a chemical reaction.

H2 (hydrogen gas) and O2 (oxygen gas) are reactants in the reaction that forms liquid water: 2 H2(g) + O2(g) → 2 H2O(l).

Note that mass is conserved in this equation. There are four hydrogen atoms and two oxygen atoms on the original and multiplicative sides of the equation.

To learn more about reactants, visit;

https://brainly.com/question/6421464

#SPJ13

what was mendeleevs predictions for germanium

Answers

Answer

Mendeleev predicted the properties of undicovered elements such as Germanium. He ddeuced based on the gaps in the periodic tbl

If a new McDonalds opens up in town, then the supply curve for cheeseburgers will shift to

to the left
to the right
upward
downward

Answers

your answer is upward.

Hi I have a homework can you please help me.

Answers

To predict how many electrons an element can gain or lose, we can be guided by the group to which it belongs in the periodic table. Chlorine belongs to group VII of the periodic table. This means that it has 7 valence electrons.

According to the octet rule, for an atom to be stable it must have 8 electrons in its last energy level, this means that chlorine can gain one electron to comply with the octet rule.

So, the answer will be: a.1

how to do 4 please it is a quick question

Answers

Answer

a) Group 16

b) Group 1

c) Group 15

d)

e)

f) Sodium

g) Oxygen

h) Phosphorus

Procedure

Using the periodic table below identify the elements. The periodic table organizes elements in a way that reflects their number and pattern of electrons. The table places elements into columns—groups—and rows—periods.

An element’s column number gives information about its number of valence electrons and reactivity. In general, the number of valence electrons is the same within a column and increases from left to right within a row. Applies only for groups 1,2, 13-18 (remembering that from 13 to 18 the last number is the valence).

Do you think it will be harder to get the strong magnets to “change phase”? Explain.

Answers

Yes, it will be harder to get the strong magnets to change phase​ because the molecules are tightly packed together.

What is a Magnet?

This is referred to as a material which has the ability to produce its own magnetic field and consists of north and south poles. It is usually made from substances such as iron and is usually hard.

In a magnet, the like poles repel and the unlike poles attract and in this scenario, it will be harder to get the strong magnet to 'change phase' as a result of the atomic structure of the substances involved.

They are in the form of solids, which means that there is very little or no space between the atoms. This translates to a higher force of attraction and strong bonding thereby making it the most appropriate choice.

Read more about Magnet here https://brainly.com/question/14997726

#SPJ1

If 200.4 g of water is mixed with 101.42 g of salt, the mass of the final solution would be reported as


A)

301.82 g.

B)

301.8 g.

C)

302 g.

D)

300 g.

Answers

A all you have to do is add

25 Lorax equals how many schlopp

Answers

      We produce trash. Every time we produce something, waste is typically produced. That trash was referred to by Dr. Seuss as "Gluppity Glup" and "Schloppity-Schlopp." Whatever we choose to call it, waste can become a problem if it isn't handled appropriately.

Schloppity Schlopp, what is he? In The Lorax?

We produce trash. Every time we produce something, waste is typically produced. That trash was referred to by Dr. Seuss as "Gluppity Glup" and "Schloppity-Schlopp." Whatever we choose to call it, waste can become a problem if it isn't handled appropriately.

What abilities did The Lorax haveAxe ManTotal name Unknown.Alias. A Lorax. Lorax. Origin: Mustache (by Once-ler). A Lorax.Occupation. The Truffula forest's defender.Powers/Skills. Immortality. superior intelligence, hobby. the preservation of the Truffula woodland. frightening the Once-lerGoals. With his life, defend the truffula woodland (ongoing).Family. zero knownWhat is the Lorax image's equivalent in schlopp?

   Using the literary device of personification to create relatable characters for industry (as the Once-ler), the environment (as the Truffula trees), and environmental activism, the tale is widely regarded as a fable on the danger of avarice causing human damage of the natural environment.

To Learn more About Schloppity-Schlopp, Refer:

https://brainly.com/question/26276090

#SPJ10

can you help me gain a complete understanding of what chemically occurs during the electrolysis of copper sulfate using copper for both electrodes? the copper sulfate in this situation is dissolved in water. thank you

Answers

In electrolysis, the anode is positively charged while cathode is negatively charged

So, Cu2+ moves towards the negative electrode which is cathode

while SO42- moves towards anode

Since cathode(being negatively charged) rich in electrons, Cu2+ gains 2 electrons and sticks to the electrode and becomes Cu (solid form)

While, on anode, SO42- should go to loose electrons but this doesnt happen as it requires lot of energy to do that (overvoltage)

Instead, anode (which is itself made of Cu) starts loosing electrons and starts dissolving to release Cu2+ ions (as this process will require less energy)

So, in the electrolysis of CuSo4 using Cu electrodes,

Cathode reaction: Cu2+ + 2 e ---> Cu

Anode reaction: Cu ---> Cu2+ + 2e

Not a timed or graded assignment. Quick answer showing what whole numbers I need to put in = amazing review

Answers

ANSWER

[tex]CF_4+2Br_2\text{ }\rightarrow CBr_4+2F_2[/tex]

STEP-BY-BY STEP EXPLANATION:

Given equation

[tex]CF_4+Br_2\text{ }\rightarrow CBr_4+F_2[/tex]

To balance the above equation, we will need to apply the law of conservation of mass

The next process is to assign variables to each of the reactants and products

[tex]\text{aCF}_{4\text{ }}+bBr_2\text{ }\rightarrow cCBr_4+dF_2[/tex]

For carbon

we have 1 carbon atom at the reactant side and 1 carbon atom on the product side

Mathematically

a = c

For Fluorine

We have 4 atoms of fluorine at the reactant side and 2 atoms of fluorine at the product side

4a = 2d

For Bromine

we have 2 atoms of bromine on the reactant side and 4 bromine atoms on the product side.

2b = 4c

Since a = c

Therefore, a = 1 and c = 1

2b = 4c

Recall that, c = 1

2b = 4

Divide both sides by 2

2b/2 = 4/2

b = 2

we also know that, 4a = 2d

a = 1

4(1) = 2d

4 = 2d

Divide both sides by 2

4/2 = 2d/2

d = 2

Therefore,

a = 1

b = 2

c = 1

d = 2

Phenyl magnesium bromide is used as a Grignard in organic synthesis. determine it’s empirical formula and molecular formula of this compound ? the molar mass of the compound is 181.33g/mol and it contains 39.7458%g/mol C, 2.77956% H, 13.4050% Mg and 44.0697% Br

Answers

For this question we will find the empirical formula and the molecular formula for a compound made of 39.7458% of C, 2.77956% of H, 13.4050% of Mg, and 44.0697% of Br. The mass we are calculating will be 181.33g/mol. The first thing we need to do is to find out how many grams of each element we actually have:

181.33g/mol = 100%

x grams = 39.7458%

x = 72.07 grams of C

181.33 = 100%

x grams = 2.77956%

x = 5.04 grams of H

181.33 = 100%

x grams = 13.4050%

x = 24.307 grams of Mg

181.33 = 100%

x grams = 44.0697%

x = 79.91 grams of Br

Now we have the mass for each element, we need to find the number of moles that each element has based on their masses and the molar mass of each one:

Carbon = 12g/mol

H = 1g/mol

Mg = 24.305g/mol

Br = 79.9g/mol

For Carbon:

12g = 1 mol

72.07g = x moles

x = 6 moles of C

For Hydrogen:

1g = 1 mol

5.04g = x moles

x = 5 moles of H

For Magnesium:

24.305g = 1 mol

24.307g = x moles

x = 1 mol of Mg

For Bromide:

79.90g = 1 mol

79.91g = x moles

x = 1 mol of Br

The molecular formula for this compound will be C6H5MgBr, this is Phenylmagnesium bromide, this will also be its empirical formula, since there is no way we can divide the numbers and make an empirical formula.

Which of the following is an expression of Avogadro's law (k = constant)?
A. V = n
B. V = k/n
C. nV = k
D. V = kn

Answers

V=kn   is an expression of Avogadro's law where temperature and pressure are constant.

What is Avogadro's law?

Avogadro's law is a gas law  which states that the total number of atoms or molecules  has a direct proportion  to the volume occupied by a gas at a constant temperature and pressure.

It is closely related to ideal gas equation  as it links temperature, pressure, volume and the amount of substance.It is given as, V∝n,

The straight line graph of volume versus moles is a straight line passing through the origin which implies that zero moles of gas occupy zero volume.The empirical relation of Avogadro's law is  derived from the kinetic theory of gases by taking into consideration the assumptions of an ideal gas.

Learn more about Avogadro's law,here:

https://brainly.com/question/4133756

#SPJ1

What is this geometrical chemistry name of this?

Answers

The geometrical chemistry name of the given structure is tetrahedral geometry or Sp3 hybrid structure and the hybridisation is called Sp3 hybridisation .

What is Sp3 hybridisation?

The process of combining the characteristics of one 2s orbital and three 2p orbitals to produce four hybrid orbitals with similar properties is known as "sp3 hybridization." An atom needs three p orbitals and a s orbital in order to be sp3 hybridized.

Tetrahedral hybridization, or sp3, is the process by which one's' orbital and three 'p' orbitals from the same atomic shell combine to generate four new equivalent orbitals. Sp3 hybrid orbitals are the new orbitals that have generated.

These form an angle of 109°28' with one another and are pointed at the four corners of a conventional tetrahedron.

The sp3 hybrid orbitals are at an angle of 109.280 degrees.

25% s character and 75% p character make up each sp3 hybrid orbital.

Ethane (C2H6) and methane are two examples of sp3 hybridization.

Learn more about hybridisation here :

brainly.com/question/22765530

#SPJ13

Fill in the table to show your work." Write the entire given: you do not need to include the substance/formula. Round all numbers to thehundredths.Use the following units: "mol", "molecules", "atoms" and "g" for grams and "L" for liters.If you need to write an exponent use the "*" (ex: 6.02 x 10^23).What is the mass of 6.30 moles of Ca(OH)2?

Answers

The question requires us to calculate the mass of 6.30 moles of Ca(OH)2.

To calculate the mass of the given number of moles of Ca(OH)2, first we need to calculate the molar mass of this compound and then multiply it by the number of moles given.

- Calculating the molar mass:

We calculate the molar mass from the atomic mass of the elements Ca, O and H (the elements present in the molecule) and considering the number of atoms of this elements.

The atomic masses are:

atomic mass (Ca) = 40.08 u

atomic mass (O) = 15.99 u

atomic mass (H) = 1.01 u

There is 1 atom of Ca, 2 atoms of O and 2 atoms of H in the molecule. Thus, we calculate the molar mass of Ca(OH)2 as:

molar mass Ca(OH)2 = (1 * 40.08) + (2 *15.99) + (2 * 1.01) = 74.08 g/mol

- Calculating the mass of 6.30 moles of Ca(OH)2:

Now that we have the molar mass of Ca(OH)2, we can use it to calculate the mass of the given number of moles of this compound. To do that, we'll use the following equation:

[tex]n=\frac{m}{M}\to m=n\times M[/tex]

where n is the number of moles, m is the mass and M is the molar mass.

The calculation we need to do, with units, is as it follows:

[tex]6.30\text{ mol}\times\frac{74.08g}{1\text{mol}}=466.7\text{ g}[/tex]

Therefore, the mass of 6.30 moles of Ca(OH)2 is 466.7 g.

Balance the following

Answers

Answer:

Your coefficients (the numbers in front of the molecule) will be the following from left to right.

1. 1 - 2 - 1 - 2

2. 2 - 1 - 2 - 2 - 1

3. 2 - 4 - 1

4. 2 - 4 - 3

5. 2 - 2 - 2 - 1

6. 1 - 1 - 1

7. 2 - 1 - 2

8. 3 - 1 - 2 - 3

9. 3 - 1 - 2 - 3

10. 2 - 1 - 1 - 1

Explanation:

To balance this equations first count how many times an element is on each side and then see what needs to be changed in order to balance them.

Only this one question don’t need to write an entire goddam 15 sentences but just give me a correct answer

Tysm !!!

Answers

A given element must have the same number of protons as neutrons and electrons, this is not a requirement. No other element has an atom with two protons besides helium, which has two protons in every atom.

How do electrons work?

An electrical force keeps electrons in their shells. An atom's protons and electrons are drawn to one another. They are both electrically charged. Electrons have a negative charge (-), while protons have a positive charge (+).

Where can you find electrons?

Electrons are present outside the atom's nucleus, in contrast to protons and neutrons, which are contained inside the nucleus at its center. Negative electrons are drawn to the positive nucleus because the electric charges of opposite polarity attract one another.

To know more about Electron visit:

https://brainly.com/question/1255220

#SPJ13

The complete question is -

Does a given element always have the same number of each particle? Why or why not? Using periodic table, give some specific examples.

What method should you use to separate this sample of a mixture?
A mixture of water-soluble solid with a solid that is not water-soluble having particles with a
diameter greater than 1000 nm.

Answers

Mix the mixture with water, filter off the insoluble solids and evaporate the water to separate the soluble solids.

This gives a heterogeneous mixture, one with dissolved solids and one with undissolved solids, you can see two different phases

These two A simple filtration method can be used to separate the two phases.

Filtering the mixture yields a solution containing soluble solids, leaving the insoluble solids on the filter paper.

This will separate the two solids.

Water can be heated and evaporated to regenerate dissolved solids. This will return the original soluble solids.

So the only option consistent with this method is to "mix the mixture with water, filter off the insoluble solids, then evaporate the water to separate the soluble solids".

To learn more about method to separate mixture, visit

https://brainly.com/question/10942047

#SPJ13

The chemical formula for hydrogen peroxide is H202. Which modelrepresents a molecule of hydrogen peroxide?

Answers

Answer

The model which best represents a molecule of hydrogen peroxide (H2O2) is option B.

Write the balanced equation for the reaction that corresponds to the deltaHf for water

Answers

The equation of the enthalpy of the formation of water is:

H₂O (g) + ¹/₂ O₂ (g)----> H₂O (g)

What is the enthalpy change for the formation of water?

The enthalpy change for the formation of water refers to the heat changes that occur when a mole of water is formed from its constituent elements.

The equation for the formation of water is given below:

2 H₂O (g) + O₂ (g)----> 2 H₂O (g)

The enthalpy of the formation of water, ΔHf, is -249 kJ.

A water molecule s formed from the hydrogen gas and oxygen gas reacting with a mole ratio of 2 : 1.

The reaction of the formation of water is an exothermic reaction, hence, the enthalpy of the formation of water, ΔHf, has a negative value.

Learn more about enthalpy of formation at: https://brainly.com/question/1621852

#SPJ1

How do elements cycle through the atmosphere?

Answers

The elements cycle through the atmosphere is biogeochemical cycle. In atmosphere different types of cycle are revolving around.

What is biogeochemical cycle?

The biogeochemical cycle is refer to the exchange of substances between biotic and abiotic sources.  

It can also be defined as the process by which a chemical material circulates through Earth's biotic and abiotic regions.

There are six types of biogeochemical cycle.

Water cycleCarbon cycleNitrogen cycleOxygen cyclePhosphorous cycleSulphur cycle

Thus, the elements cycle through the atmosphere is biogeochemical cycle. In atmosphere different types of cycle are revolving around.

To learn more about biogeochemical cycle, refer to the link below:

https://brainly.com/question/1204069

#SPJ1

I need help with the last two questions pls my chemistry teacher not good

Answers

Answer:I need help with the last two questions pls my chemistry teacher not good

Explanation:

I need help with the last two questions pls my chemistry teacher not good

Other Questions
sergio is really stressed out because he has a noisy roommate, he's acting in a play this term, and he's taking a full course load. he wants to concentrate on school work, but the stress is getting to him. which strategy will help reduce sergio's stress? Algae releases carbon dioxide and water when they are burned as biofuel. Why are algae considered to be a good biofuel if they add carbon dioxide to the atmosphere? Match the cell type (sex cell or somatic cell) with the examples provided.a. white blood cellb. spermc. egg (ova)d. hepatocyte (liver cell)e. epithelial (skin) cell Cundo es navidad? two students a and b are both registered for a certain course. assume that student a attends class 80 percent of the time, student b attends class 60 percent of the time, and the absences of the two students are independent. a. what is the probability that at least one of the two students will be in class on a given day? b. if at least one of the two students is in class on a given day, what is the probability that a is in class that day? A student made the Lewis dot diagram of a compound as shown.Mg is written with two dots shown on its top. Cl is written on the right side of Mg. Cl has seven dots around it. An arrow is shown from one dot on Mg toward the vacant space around Cl. Another arrow is shown from the other dot on Mg toward the vacant space around Cl. On the top, the art title is written as Students Lewis Dot Model.What is the error in the Lewis dot diagram? (3 points)Another Cl should be shown around Mg that will transfer its unpaired electron to Mg.The number of dots around Mg should be one because there is only one Cl around Mg atom.Another Cl should be shown around Mg that will receive the second electron on Mg.The number of dots around Cl should be six because it is receiving two electrons from Mg. 3 times the sum of a number and 12 is 56 A boulder has just finished rolling down a hill and is now on flat ground. If the boulder is moving at 30 m/s when it reaches the flat ground and slows down to a roll of 5 m/s with a deceleration of -5m/s2, how long did it take to decelerate? Here are 6 celebrities with some of the highest net worths (in millions of dollars) in a recent year: George Lucas (5500).Steven Spielberg (3700), Oprah Winfrey (3200), Paul McCartney (1200), J. K. Rowling (1000), and Jerry Seinfeld (950)Find the range, variance, and standard deviation for the sample data. What do the results tell us about thepopulation of all celebrities? Based on the nature of the amounts, what can be inferred about their precision? porter's model suggests that if a company develops a strategy around the unique qualities of its products (like apple, for example), then we can say it has a strategy. group of answer choices low-cost integrated competitive differentiation A certain star has an absolute magnitude of 1.0 and an apparent magnitude of 5.4. How far away is this star (in parsecs)? Use the text The Legend of the Giant's Causeway to answer the questions.The Legend of the Giant's CausewayWhich line from the text helps the reader understand the tone of Finn's marriage to Oona?(1 point)ResponsesWhat can we do?What can we do?Youre the wisest wife in Ireland, after all.Youre the wisest wife in Ireland, after all.Oona patted Finns beefy forearm.Oona patted Finns beefy forearm.Oona! Ive been an eejit.Oona! Ive been an eejit. I need help please!!! I need the answer please!! so if i get a 60% on a math test and my current grade is an 80%, how much will my grade go down? According to Akbar, how was Gao was superior to Timbuktu? andrew (age 30) received a traditional ira distribution (code 1) with a gross amount of $10,000 and a taxable amount of $8,000. he rolled over $5,000 the next week. what is the taxable amount of the distribution and how much additional tax will he owe? Erica wants to build the birdhouse shown. She bought a 29-inch by 45-inch sheet of plywood. Does Erica have enough wood to make the birdhouse? Explain. Find the area of the base and the sides. A(base) = 7x7 = 49 A(sides) = 7x11 = 77 Find the total area. th Total Area = 2x +4x)= 98+=in? Two right triangular gardens each have a shorter leg 20 feet. The length of the longer leg of one garden is twice the length of the longer leg of the other garden. The perimeter of the larger garden is 1.6 times the perimeter of the other garden. What is the approximate length of the longer leg of the smaller garden? Use a graphing calculator to help you determine the answer. PLEASE HELPPlease translate the following into French with correct vocabulary.Go straight then turn right before Avenue Victor Hugo street. Go straight till you get to the light. Turnleft then go straight and then the Htel de Ville is on your left. A bus can hold 20 people in 15 minutes how many people could ride this bus in 4 hours