Why are the non-living things important to an ecosystem?

Answer:

C and D

Explanation:

The answer is C and D

0.02314 moles of  NO₂ can be formed from the decomposition of 1.25 g of dinitrogen pentoxide.

The balanced equation for the decomposition of dinitrogen pentoxide is:

2 N₂O₅ → 4 NO₂ + O₂

The molar mass of N₂O₅  is 108.01 g/mol.

To determine the number of moles of N₂O₅  present in 1.25 g, we use the following calculation:

moles N₂O₅  = mass / molar mass

moles N₂O₅ = 1.25 g / 108.01 g/mol

moles N₂O₅ = 0.01157 mol

From the balanced equation, we can see that 2 moles of N₂O₅  decompose to form 4 moles of NO2. Therefore, the number of moles of NO2 produced can be calculated as:

moles  NO₂ = (0.01157 mol N2O5) × (4 mol NO2 / 2 mol N2O5)

moles  NO₂ = 0.02314 mol

Therefore, 0.02314 moles of  NO₂ can be formed from the decomposition of 1.25 g of dinitrogen pentoxide.

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Answer:

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

Explanation:

The reaction between Al(OH)₃ and HCl is called neutralization reaction which produces salt (AlCl₃) and water (H₂O). Thus, we can write the equation for reaction as follow:

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

The above equation can be balance as illustrated below:

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

There are 3 atoms of Cl on the right side and 1 atom on the left side. It can be balance by putting 3 in front of HCl as shown below:

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

There are 3 atoms of O on the left side and 1 atom on the right side. It can be balance by putting 3 in front of H₂O as shown below:

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

Now, the equation is balanced.

Neutralization reaction is a chemical reaction in which an acid and a base reacts to form a neutral salt.

Since, acid and base reacts they neutralize the affect of each other and no excess of hydroxide ions or hydrogen ions are present in the solution.

The correct balanced equation between the base Al(OH)₃ and stomach acid HCl will be:

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

The explanation for the balanced reaction is:

The reaction between Aluminium hydroxide and Hydrochloric acid is called neutralization reaction which produces salt aluminium chloride and water. Thus, it can be represented as:

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

The above equation is balanced according to:

1. Al(OH)₃(s) + HCl(aq) —> AlCl₃(aq) + H₂O(l)

2. One atom of chlorine on the left side and three atoms on the right side and can be balanced as shown below:

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

3. Three atoms of oxygen on the left side and one atom on the right side  can be balanced as the equation below:

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

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Taking into account the definition of molarity,  the concentration of Na₃PO₄ in solution is 0.192\(\frac{moles}{lliter}\).

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

\(Molarity=\frac{number of moles}{volume}\)

Molarity is expressed in units \(\frac{moles}{lliter}\).

Being the molar mass of Na₃PO₄ 163.94 g/mole, that is, the amount of mass that a substance contains in one mole, the amount of moles that contains 23.6 g sample of Na₃PO₄ is calculated as:

\(23.6 gramsx\frac{1 mole}{163.94 grams} = 0.144 moles\)

Then you know:

Replacing in the definition of molarity:

\(Molarity=\frac{0.144 moles}{0.750 L}\)

Solving:

Molarity= 0.192\(\frac{moles}{lliter}\)

Finally, the concentration of Na₃PO₄ in solution is 0.192\(\frac{moles}{lliter}\).

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Answer:

The southern hemisphere is currently experiencing "Summer"

Explanation:

The Southern hemisphere is experiencing summer because it is closer to the sun than the Northern Hemisphere and also, direct light is more hotter than indirect light.

So, first, let's try an EXPERIMENT!

Take a VERY bright flashlight or a very small laser that can't harm you or just burn a paper in 1 second.

Then, take a piece of paper, or maybe just your skin, (like your hand) and place it under the light or laser, (for the laser, you should probably take the paper), and place the light source right above your skin, then, after some time, when it gets hot, measure the temperature. (around like 30 seconds later),

Note down the temperature...

Now, do the same thing, accept, do it in a very weird angle, face it towards your paper or hand, but, do it in an angle. More than like 30 degrees. Then, after some time, note down the temperature.

You probably, noticed, that the direct light (the one with the straight light facing your paper or skin, was hotter). Look at the image below, and you can understand better.

So, the same thing applies to the earth. The southern hemisphere in this picture is facing more directly to the sun than the northern hemisphere. That is why your answer is

Thank you! Please mark me Brianliest!

Remember to have fun, and a nice day!

Answer:   summer

Explanation:

The audience that President Reagan appeals to in this part of the speech is  : "the American people" (Option A)

An audience is a group of people who read a certain piece of work. As a writer, you should anticipate your audience's wants or expectations in order to transmit information or argue for a certain position.

Knowing your audience helps you decide what information to include, how to arrange that information, and what type of supporting elements are required for the reader to grasp what you are presenting. It also has an impact on the tone and organization of the document.

The audience for a literary review is often composed of people of the writer's own discipline. However, these discipline colleagues may not be experts in the specific topic or problem addressed in the literature study.

The evidence in the text that indicates that the speaker is addressing the American People are:

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answer:

high temperatures

hydrogen gas

Answer:

C and D

Explanation:

just did this on edg :)

Answer:

Both resulted in gas formation. Both resulted in color change.

Explanation:

Follow me!

Answer:

statement second and third are both corect

Explanation:

When iron(grey) reacts with sulfur(yellow) chemical change takes place in which iron sulfide is formed which black in color.

Fe(s) + S(s)\rightarrow FeS(s)Fe(s)+S(s)→ FeS(s)

When we heat copper sulfate-pentahydrate(blue) ,water molecule present in its crystal will get evaporated and it will become an anhydrous copper sulfate which will be white in color.

CuSO_{4}.5H_{2}O(s)\overset{heat}{\rightarrow} CuSO_{4}(s)+5H_2O(g)CuSO

4

.5H

2

O(s)

→

heat

CuSO

4

(s)+5H

2

O(g)

So, in both the reactions chang

request:

set as brainiest

The ozone layer is present in the stratosphere layer of the Earth's atmosphere. Therefore, option (C) is correct.

An atmosphere can be defined as layers of gases that envelop a planet and is held in place due to the gravity of the planetary body. A planet contains an atmosphere when the gravity is great and the temperature of the atmosphere of any planet is low.

Earth's atmosphere is made of Nitrogen (78 %), Oxygen (21%), Argon (0.9%), and Carbon dioxide (0.04 %).  The troposphere can be defined as the lowest layer of the atmosphere. The troposphere contains 75 to 80 % of the mass of the atmosphere.

The stratosphere contains the ozone layer, at an altitude between 15km and 35km. This atmospheric layer absorbs most of the UV radiation that Earth receives from the Sun.

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Answer:

e. C2+

Explanation:

In the molecular orbital theory, the valence electrons in molecules are filled into molecular orbitals in accordance with Hund's rule and Pauli exclusion theory.

The orbitals are filled in order of increasing energy (Aufbau principle) as shown in the question. The bond order refers to half the difference between the number of bonding and antibonding electrons in the molecule.

The smaller the bond order the longer the bond length and vice versa. The specie having the least bond order is C2+ with a bond order of 1.5. This specie certainly has the longest bond length also. Hence the answer.

Applying molecular orbital theory the dicarbon specie that has the longest bond length is ; ( E )  C₂⁺

The valence electrons in molecules fill up molecular orbits in accordance to Pauli exclusion theory  and Hund's  rule.  while

The bond order is the difference between bonding and antibonding electrons found in a molecule divided into half. while the molecule orbitals are filled according to increasing energy in accordance to Aufbau principle

The bond order of a molecule is inversely proportional to the bond length of the molecule. Therefore the dicarbon specie that has the longest bond length is C₂⁺ because it has the shortest bond length of approximately 1.5.

Hence we can conclude that Applying molecular orbital theory the dicarbon specie that has the longest bond length is ; ( E )  C₂⁺

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The balanced nuclear equation for the beta decay of 234/90Th can be represented as follows: ^234/90Th --> ^234/91Pa + e^0/-1β

In this equation, the nucleus of thorium-234 (234/90Th) undergoes beta decay. During beta decay, a neutron within the nucleus is converted into a proton, resulting in the emission of an electron (beta particle). As a result, the thorium-234 nucleus is transformed into protactinium-234 (234/91Pa) by gaining one proton.

The beta particle emitted during the decay process is represented as e^0/-1β, where the superscript 0 denotes that the electron has no charge (neutral), and the subscript -1 indicates that the electron carries a negative charge of -1.

It is important to note that in a nuclear equation, the total atomic mass and atomic number on both sides of the equation must be equal to maintain a balanced equation and conserve mass and charge.

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Answer:

hope you like my answer

Explanation:

this is the answer

Answer: Aluminum, because it allows heat to flow easily.

Have a nice day!

In an acetic acid solution:

1. To make a buffer with pH = 5.00, have a ratio of

\(\frac{[A-]}{[HA]} = 10^{-5.50}\) = 0.316.

The volume of sodium hydroxide needed:

V(NaOH) = (0.316 M - 0.200 M) / 4.50 M = 0.0316 L = 31.6 mL

Therefore, 31.6 mL of 4.50 M sodium hydroxide must be added to 250.0 mL of 0.200 M acetic acid solution to make a buffer with pH = 5.00.

2. The pH of the buffer is calculated as follows:

pH = pKa + log(\(\frac{[A-]}{[HA]}\))

= 4.76 + log(0.2/0.1)

= 4.86

Therefore, the pH of the buffer is 4.86.

3. The mass of salt that must be dissolved in 0.25 dm³ of 1 mol dm³ propanoic acid to give a buffer of pH 4.87:

\(\frac{[A-]}{[HA]} = 10^{-4.87}\) = 0.0114

Therefore, the mass of acetate that must be dissolved:

Mass of acetate = (0.0114 mol dm³)(0.25 dm³) = 0.00285 g

Therefore, 0.00285 g of sodium propanoate must be dissolved in 0.25 dm³ of 1 mol dm³ propanoic acid to give a buffer of pH 4.87.

4. The pH of the buffer is calculated as follows:

pH = pKa + log(\(\frac{[A-]}{[HA]}\))

= 4.74 + log(0.1/0.1)

= 4.74

Therefore, the pH of the buffer is 4.74.

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Answer:

C because they are the same

The measure of the length of events and the duration of intervals between events is time.

The duration of events or the gaps between them can be measured, compared, or even ordered using time. The lengthy period of time that the Earth's geologic history takes up is known as geologic time. Starting at the beginning of the Archean Eon  formal geologic time runs until the present. Geology is defined as the "Science of the Earth."

Geology is the fundamental Earth science that examines how the earth created, its structure and composition, and the various forces acting on it. It is sometimes known as geoscience or earth science.

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Answer:

true

Explanation:

google

Answer:

686.43363984 is the answer when 7.8 moles is converted.

1a. The balanced equation for the reaction is:

1b. The number of mole of Ca(OH)₂ is 0.0247 mole  

1c. The number of mole of H₃PO₄ is 0.0165 mole.

1d. The concentration of H₃PO₄ is 0.432 mol/L

2. The new concentration of the H₃PO₄ solution is 0.0432 mol/L

3Ca(OH)₂ + 2H₃PO₄ —> Ca₃(PO₄)₂ + 6H₂O

Volume of Ca(OH)₂ = 71 mL = 71 / 1000 = 0.071 L

Concentration of Ca(OH)₂ = 0.348 mol/L

Mole = Concentration × Volume

Mole = 0.348 × 0.071

3Ca(OH)₂ + 2H₃PO₄ —> Ca₃(PO₄)₂ + 6H₂O

From the balanced equation above,

3 moles of Ca(OH)₂ reacted with 2 moles of H₃PO₄.

Therefore,

0.0247 moles of Ca(OH)₂ will react with = \(\frac{0.0247 * 2}{3}\) = 0.0165 mole of H₃PO₄.

Thus, the number of mole of H₃PO₄ is 0.0165 mole

Volume of H₃PO₄ = 38.20 mL = 38.20/ 1000 = 0.0382 L

Mole of H₃PO₄ = 0.0165 mole

\(Concentration = \frac{mole}{volume} \\\\Concentration = \frac{0.0165}{0.0382}\)

Initial Volume (V₁) = 10 mL

Initial concentration (C₁) = 0.432 mol/L

New volume (V₂) = 100 mL

The new concentration of the H₃PO₄ solution can be obtained as follow:

0.432 × 10 = C₂ × 100

4.32 = C₂ × 100

Divide both side by 100

C₂ = \(\frac{4.32}{100}\\\)

Therefore, the new concentration of the H₃PO₄ solution is 0.0432 mol/L

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Answer:

6.02 × 10²⁷ km

Explanation:

Step 1: Calculate the height of the stack of pennies

A penny has a thickness of approximately 1.0 mm. If you stacked Avogadro's number of pennies (6.02 × 10²³ pennies) one on top of the other on Earth's surface, the height of the stack of pennies would be:

6.02 × 10²³ pennie × 1.0 mm/1 pennie = 6.02 × 10²³ mm

Step 2: Convert 6.02 × 10²³ mm to kilometers

We will use the following conversion factors.

6.02 × 10²³ mm × 1 m/10³ mm × 1 km/10³ m = 6.02 × 10²⁷ km

The question requires us to identify the type nuclear decay that releases a photon of light energy and does not change the atom's mass or atomic number.

As we are talking about a nuclear decay that doesn't provoke a change in the atom's mass or atomic number, we can rule out both alpha and beta decay. Remember that an alpha particle contains two protons and two neutros, therefore an alpha decay changes both mass and atomic number. Similarly, the emission of an beta particle also changes the atomic number.

Then, we can analyze the remaining options: gamma decay and electron capture decay.

Electron capture decay is i process in which a proton-rich nucleus of an electrically neutral atom absorbs an inner atomic electron, causing the change of a proton to neutron and causes the emission of a neutrino.

Gamma decay, on the other side, an atomic nucleus changes from a higher energy-state to a lower energy-state through the emission of electromagnetic radiation (a photon). Since it doesn't occur the emission of a particle, there is no change to the number of protons or neutrons and the atom's mass and atomic number remains unchanged.

Therefore, the best option would be letter A, "Gamma decay".

Answer & xplanation:

A. The electron arrangement for Si (atomic number 14) is: 1s² 2s² 2p⁶ 3s² 3p².

B. The electron arrangement for Ne (atomic number 10) is: 1s² 2s² 2p⁶.

C. B³+ is a cation, which means it has lost three electrons compared to neutral boron (B). Therefore, its electron arrangement is: 1s² 2s² 2p¹.

D. Cl¹⁻ is an anion, which means it has gained one electron compared to neutral chlorine (Cl). Therefore, its electron arrangement is: 1s² 2s² 2p⁶ 3s² 3p⁶.

Answer:

7.37. Oxygen for First Responders In self-contained breathing devices used by first responders, potassium superoxide, KO9, reacts with exhaled carbon dioxide to produce potassium carbonate and oxygen: 4 KO2s) 2 CO2g)2 K9CO3(s)+3 O2(g) How much O9 could be produced from 85g KOg?

Answer: potential energy is stored

Explanation:

The expected result of the experiment is that the rate of precipitation of sulfur will be faster with hydrogen chloride than with acetic acid.

What is Precipitation?

Precipitation refers to the process in which a substance in a solution comes out of solution and forms a solid. This occurs when the concentration of the substance exceeds its solubility limit in the solution, resulting in the formation of solid particles that settle at the bottom of the solution.

Procedure:

Prepare a series of solutions with different monobasic acids. For example, you can prepare solutions of sodium thiosulphate (Na2S2O3) with different monobasic acids, such as hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3), at a constant concentration and volume.

Place equal volumes of the thiosulphate solution and each monobasic acid solution in separate beakers or test tubes.

Start the timer or stopwatch as soon as the two solutions are mixed. The thiosulphate ions will react with the hydrogen ions from the monobasic acid, resulting in the formation of sulphur precipitate according to the following chemical equation:

S2O3^2- + 2H+ -> H2O + S + SO2

Observe the reaction and record the time taken for the formation of sulphur precipitate in each solution.

Compare the rates of precipitation of sulphur for each monobasic acid solution to study the dependence of the rate on the nature of the monobasic acid. Note any trends or differences in the rates of precipitation among the different acids used.

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The glass opposite to the negative electrode started to glow. Hence, option B is correct.

A cathode-ray tube (CRT) is a specialized vacuum tube in which images are produced when an electron beam strikes a phosphorescent surface.

J.J. Thomson, through his famous Cathode ray experiment, proved that all atoms contain small negatively charged particles known as electrons. In the experiment, he applied electric voltage across a cathode ray tube. a fluorescent material coating was done on the positive side. When the voltage was applied, the positive side has glowing dots.

Hence, option B is correct.

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Answer:

its b

Explanation:

Any time we are working with solutions and its molar concentration we will use the equation:

Where C is the concentration, n is the number of moles of the solute and V is the volume of solution.

We can identify such situations when we are working with molarity, molar concentration, solutions with concentration in "M" or "mol/L" units and other cases.

In this case, we can see that we are working with these three quantities:

- We want the volume in mL os a solution, V.

- We have a molar concentration, C, 0.626 M NaOH.

- We have a number of moles of solute we want to get, n, 0.332 mol of NaOH.

So, we have:

So:

So, the volume we need is approximately 530 mL.

The partial pressure of hydrogen in the collected gas sample is 733.0 mm Hg (calculated by subtracting the partial pressure of water, 17.0 mm Hg, from the total atmospheric pressure, 750.0 mm Hg).

When a gas is collected over water, the presence of water vapor affects the total pressure observed. In this case, the total atmospheric pressure is given as 750.0 mm Hg, and the partial pressure of water vapor at 19.5°C is 17.0 mm Hg.

To determine the partial pressure of hydrogen, we need to subtract the partial pressure of water vapor from the total atmospheric pressure. Partial pressure refers to the pressure exerted by an individual gas component in a mixture. In this scenario, the collected gas is primarily hydrogen, with water vapor being the other component.

By subtracting the partial pressure of water vapor (17.0 mm Hg) from the total atmospheric pressure (750.0 mm Hg), we can find the partial pressure of hydrogen:

Partial pressure of hydrogen = Total atmospheric pressure - Partial pressure of water vapor

Partial pressure of hydrogen = 750.0 mm Hg - 17.0 mm Hg

Partial pressure of hydrogen = 733.0 mm Hg

Therefore, the partial pressure of hydrogen in the collected gas sample is 733.0 mm Hg.

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