can yall please help im very slow

Answer:

1.58×10¯⁷ M.

Explanation:

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

pH = 6.8

Concentration of hydronium ion [H₃O⁺] =?

The pH of a solution is given by the following equation:

pH = –Log [H₃O⁺]

With the above formula, we can obtain the concentration of hydronium ion [H₃O⁺] as follow:

pH = 6.8

Concentration of hydronium ion [H₃O⁺] =?

pH = –Log [H₃O⁺]

6.8 = –Log [H₃O⁺]

Multiply both side by by –1

–6.8 = Log [H₃O⁺]

Take the anti log of –6.8

[H₃O⁺] = antilog (–6.8)

[H₃O⁺] = 1.58×10¯⁷ M

Therefore, the concentration of hydronium ion [H₃O⁺] in the solution is 1.58×10¯⁷ M.

Answer and Explanation:

Humans are one of the organisms at the top of a food web. Other animals are Orcas, Lions, Raptors, and others. These animals are called Ape.x Predators, because they are at the top of the food web.

#teamtrees #PAW (Plant And Water)

Explanation:

Hydrocarbons are defined as organic compounds which are only made from carbon and hydrogen atoms.

There are mainly 3 types of hydrocarbons:

Answer: blue

Explanation:

The colours from yellow to red indicate an acidic solution, colours blue to violet indicate alkali and green colour indicates that a solution is neutral.

Answer:

KOH is the limiting reactant

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to identify the required limiting reactant by calculating the moles of water vapor produced by each reactant, CO2 and KOH, as shown below:

[tex]1.4gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molH_2O}{1molCO_2}=0.0318mol H_2O\\\\2.2gKOH*\frac{1molKOH}{56.11gKOH}*\frac{1molH_2O}{2molKOH}=0.0196mol H_2O[/tex]

In such a way, since 2.2 grams of KOH yield the fewest moles of water vapor, we infer KOH is the limiting reactant.

Regards!

Answer:

B. NH₃ (l) dissolves in water to form a solution

Explanation:

A solution is a uniform or homogenous mixture of two or more substances. The components of a solution are the solute and solvent. The solute is the substance that is being dissolved in another substance. The solvent is the substance which dissolves the solute.

Mixing the given solutes in water results innthe following:

A. Helium being an inert gas does not dissolve in water at all. Therefore, no solution is formed.

B. Liquid ammonia is very solution in water. When mixed with water, it dissolves in water to form aqueous ammonia solution. Aqueous ammonia is an alkaline solution of ammonia dissolved in water.

C. Silicon (iv) oxide, SiO₂, is a crystalline solid whichnis completely insoluble in water. Mixing it with water does not result in the formation of a solution.

D. Pentane, C₅H₁₂, is a liquid hydrocarbon substance which is insoluble in water. It does not mix with water to form a solution, rather it forms two separate immiscible layers of liquids.

Answer:

See explanation and image attached

Explanation:

Alkenes undergo hydrogenation to give the corresponding alkanes. Where the structure of the original alkene is unknown, we can deduce the structure of the alkene from the structure of the products obtained when it undergoes various chemical reactions.

Now, the fact that we obtained 2-methylhexane upon hydrogenation and the two compounds had different heats of hydrogenation means that the two compounds were geometric isomers. The original compounds must have been cis-2-methyl-3-hexene and trans-2-methyl-3-hexene.

When reacted with HCl, the same compound C7H15Cl is formed because the stereo chemistry is removed.

However, we know that the trans isomer is more stable than the cis isomer hence the cis isomer always has a higher heat of hydrogenation than the trans isomer. Thus X is cis-2-methyl-3-hexene.

Answer:

6 molecules

Explanation:

Only three elements are present in the products of photosynthesis: oxygen, carbon, and hydrogen. These same elements are present in the reactants of photosynthesis. Notice that it takes six molecules of water and six molecules of carbon dioxide to make one molecule of glucose

Answer:

6 molecules of carbone dioxide.

Answer:

37.85 L

Explanation:

3.785 x 10.00 = 37.85 L

it would take 37.85 L  to fill a 10.00 tank

(sorry if im wrong pls dont report)

(hope this helps can i plz have brainlist :D hehe)

Answer:

Given chemical reaction is:

HI(aq)+H2O(l)→ H3O+(aq)+I−(aq)

a. The Bronsted-Lowry ace is :_________

b. The Bronsted-Lowry base is :_________

c. The conjugate acid is :_________

d. The conjugate base is:________

Explanation:

According to Bronsted-Lowry acid-base theory,

an acid is a substance, that is a proton donor.

A base is a proton acceptor.

The conjugate acid is formed from the base after gaining a proton.

The conjugate base is formed from the acid after losing a proton.

For the given reaction,

a. The Bronsted-Lowry acid is :__HI(aq)_______

b. The Bronsted-Lowry base is :_H2O(l)________

c. The conjugate acid is :___H3O+(aq)______

d. The conjugate base is:___I-(aq)_____.

Answer:

Explanation:

Bronsted -Lawry acid are hydrogen ion donators . Here HI  is Bronsted -Lawry acid.

HI   ⇄    H⁺   +   I⁻

Bronsted -Lawry base are those which can accept hydrogen ion .

I⁻  +  H⁺  ⇄   HI .

Conjugate acid -base pair are shown below .

          H₃O⁺        =        H⁺       +          H₂O .

conjugate acid                                    conjugate base .

( strong acid )                                       ( weak base )

Answer:

Acetic acid, carbonic acid and chlorous acid with calcium hydroxide

Ammonia with sulfuric acid

Explanation:

A buffer is an aqueous mixture of a weak acid and its conjugate base or vice versa.

Weak acids reacts with strong bases to produce the conjugate base. In the right amount, you can produce a buffer. In the same way, you can produce a buffer from the mixture of weak bases with strong acids.

In the problem, you have weak acids (acetic acid, carbonic acid, chlorous acid), one weak base (ammonia), one strong base (calcium hydroxide) and one strong acid (Sulfuric acid).

Thus, the mixtures that can produce a buffer are:

Acetic acid, carbonic acid and chlorous acid with calcium hydroxide

And:

Ammonia with sulfuric acid

Answer:

Given molecule is CCl2F2.

What is the direction and magnitude of the net dipole of CCl2F2?

Explanation:

Dipole moment is a vector quantity.

The arrow end starts from a less electronegative atom and directs towards the more electronegative atom.

In the given molecule,

CCl2F2,

the central atom is carbon with sp3 hybridsation and there are no lone pairs on the central atom.

The molecule is tetrahedral but it is asymmetrical.

Because all the four bonded atoms are not same and there exists an electronegativity difference between F and Cl.

Hence, there exists a net dipole moment for the given molecule and the molecule is polar.

Answer:

d. none of the above

Explanation:

An electrochemical cell consists of two half-cells, with each cell containing an electrode.

The potential of a single electrode in a half-cell is called the Single electrode potential.

The emf of a cell that consists of two half-cells can be determined by connecting them to a voltmeter.

However, there is no way of measuring the emf of a single half-cell directly.

The only way to determine the emf of a single electrode is to combine it with a standard hydrogen electrode (SHE) and measure it with a voltmeter.

Therefore, the correct option is D "none of the above"

An electrochemical cell consists of two half-cells, with each cell containing an electrode.

An electrochemical cell is a device that can generate electrical energy from the chemical reactions occurring in it, or use the electrical energy supplied to it to facilitate chemical reactions in it.

The potential of a single electrode in a half-cell is called the Single electrode potential.The emf of a cell that consists of two half-cells can be determined by connecting them to a voltmeter.

The only way to determine the emf of a single electrode is to combine it with a standard hydrogen electrode (SHE) and measure it with a voltmeter.

Hence the correct option is D.

Learn more about electrochemical cell here:

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Answer:

[tex]Y=96.0\%[/tex]

Explanation:

Hello there!

In this case, considering the reaction between silver nitrate and sodium bromide, whereby sodium nitrate and silver bromide are produced:

[tex]NaBr+AgNO_3\rightarrow NaNO_3+AgBr[/tex]

By bearing to mind the solubility rules, we infer the precipitate is silver bromide, whose moles are computed by using the molarity and volume of each reactant and then decide the correct value according to the limiting reactant:

[tex]n_{AgBr}=0.0350L*0.100molAgNO_3*\frac{1molAgBr}{1molAgNO_3}=0.00350mol AgBr\\\\n_{AgBr}=0.0450L*0.080molNaBr*\frac{1molAgBr}{1molNaBr}=0.0036molAgBr[/tex]

Thus, since sodium nitrate produces the smallest theoretical yield, we calculate the grams of silver nitrate precipitate by using the 0.00350 moles and its molar mass (187.77g/mol):

[tex]m=0.00350molAgBr*\frac{187.77gAgBr}{1molAgBr}=0.657g[/tex]

And finally the percent yield:

[tex]Y=\frac{0.631g}{0.657g}*100\%\\\\Y=96.0\%[/tex]

Regards!

Answer:

So, look up for electronegativity table

There's a continuum for deciding whether the bond is non-polar, polar, or ionic

If electronegativity difference is less than 0.4 it's non-polar

Explanation:

Pls vote my answer as brainliest

Explanation:

Isopropyl alcohol is the solvent used in whiteboard markers. When it comes into contact with the permanent marker, the solvent breaks the cohesive force between the ink molecules and the whiteboard by solubilising them (i.e. returning them to solution).

Answer:

10/3

Explanation:

Hope this helps

Answer:

The compound formula for the ammonia is

N

H

3

. It is a colorless gas. It is the result of the chemical reaction between nitrogen and hydrogen gas. The chemical reaction between the gases is shown below:

N

2

+

3

H

2

→

2

N

H

3

Answer:

It produces free energy.

Explanation:

Photosynthesis is a process which is used by the plant for producing energy in the form of ATP. This energy is used by the plants in different activities which enables the plant to grow and develop successfully. There are some factors which causes change in the rate of photosynthesis means the production of energy for the plant body. If the environmental factors are suitable, more energy is produced through the process of photosynthesis.

Answer:

The answer is in the explanation.

Explanation:

A buffer is defined as the aqueous mixture of a weak acid and its conjugate base or vice versa. Buffers are able to avoid the pH change of a solution when strong acid or bases are added (As NaOH).

Based on the experiment, it is possible that the solution Z was a buffer and Y another kind of solution. For this reson, pH of the solution Y changes much more than the pH of solution Z changes despite the amount of NaOH added is the same in both solutions.

Answer:

D. the minerals they contain

Hope this answer is right!!

Answer:

false

Explanation:

consumers eat producers

Answer:

False. If they are talking about food today.

Fission, the splitting of uranium atoms, is the source of nuclear energy. This produces heat that creates steam, which a turbine generator uses to produce power. Nuclear power stations do not emit greenhouse gases since they do not burn fuel.

The energy found in an atom's nucleus, or core, is referred to as nuclear energy. All everything in the cosmos is made up of microscopic building blocks called atoms, and the nucleus is held together by energy. The compact nucleus of an atom has a tremendous amount of energy.

Atoms may generate enormous amounts of energy through two physical processes called fission and fusion. Through nuclear reactions, they produce millions of times more energy than conventional sources.

Nuclear fusion occurs in the sun and produces solar energy. In the sun's core, fusion happens when the protons of colliding hydrogen atoms fuse to form helium atoms.

Thus, Fission, the splitting of uranium atoms, is the source of nuclear energy.

To learn more about nuclear energy, follow the link;

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my answer

Explanation:

Answer. Filtration is the method of separating a solid from a liquid. A sieve sets a threshold calibration through which all undersized materials pass through. Filtration differs from sieving, where separation occurs at a single perforated layer (a sieve).

Answer:

2.7

Explanation:

Answer:

[tex]1.84x10^{24}atoms[/tex]

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to calculate the number of silver atoms in 330 grams of a silver bracelet by knowing 1 mole of silver has a mass of 108 grams and also contains 6.022x10²³ atoms; thus, the mathematical setup is shown below:

[tex]330g*\frac{1mol}{108g}*\frac{6.022x10^{23}atoms}{1mol}[/tex]

Which is equal to:

[tex]1.84x10^{24}atoms[/tex]

Regards!

Answer:

the answer is 0.078

Explanation:

edge 2021

Answer:

The next answers are

4.96

Wax

oxygen

Calculated based on the chemical equation:

✔ theoretical yield

Measured directly:  

✔ experimental yield

Determined experimentally:  

✔ experimental yield

Determined using stoichiometry:  

✔ theoretical yield

BOTH

ALL OF THE ABOVE

using accurate measurements

using pure chemicals

performing the reaction under the most ideal conditions

Explanation:

its answer aExplanation:

Answer:

1) Hydrolysis

2)Dehydration

3)Dehydration

4)Hydrolysis

Explanation:

Hydrolysis is the chemical breakdown of substances by water and depends on the chemistry, solubility, pH, and the oxidation–reduction (Eh or redox) potential of compound

https://www.sciencedirect.com/topics/earth-and-planetary-sciences/hydrolysis

With hydrolysis water will be a reactant, not a product, and is associated with breaking down substances. Hence 1 and 4 being a Hydrolysis reaction.

Dehydration on the other hand, is defined as :

In a dehydration reaction, either a hydroxyl group from one molecule combines with a hydrogen atom from the other molecule, or two hydrogen atoms from one molecule combine with an oxygen atom on the other molecule. In either case, water is released, and the two molecules are joined together.

https://www.albert.io/blog/dehydration-synthesis-ap-biology-crash-course/

Therefore it is associated with creating a bond of sorts, and water is a product, which is why 2 and 3 are dehydration.

Hope this helps!

The matching of the description with either a dehydration reaction or a hydrolysis reaction is as follows:

A Dehydration reaction may be defined as a type of chemical reaction that significantly involves the elimination or removal of water from the reactant molecules. In this type of reaction, water is definitely one of the products.

Hydrolysis reaction is just opposite to the dehydration reaction. It is also known as hydration reaction. It is a type of decomposition reaction that involves water as reactant. It is a type of chemical reaction in which a molecule of water stimulates and breaks one or more chemical bonds in the entire reaction.

Therefore, the matching of the description with either a dehydration reaction or a hydrolysis reaction is well described above.

To learn more about Hydrolysis reactions, refer to the link:

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Answer:

a. NADH and FADH₂ donate electrons to the electron transport chain

b. Molecular oxygen, O₂, is the final electron acceptor

c. The final products of the electron transport chain and oxidative phosphorylation are as follows: NAD+, FAD+, H₂O, and ATP

Explanation:

The citric cycle oxidize acetylCoA molecules to carbon dioxide and in the process produce the reduced coenzyme NADH and FADH₂. These reduced coenzymes then are able to donate their electrons to various complexes in the electron transport chain. The flow of these electrons through the electron transport chain is coupled to proton pumping out of the mitochondrial matrix into the intermembrane space. Ultimately, the energy of the proton motive force is used to drive synthesis of ATP from ADP and inorganic phospahte and the electrons are accepted by molecular oxygen to produce water. This process is known as oxidative phosphorylation.

Therefore, the answers to the given questions a, b and c are as follows:

a. NADH and FADH₂ donate electrons to the electron transport chain

b. Molecular oxygen, O₂, is the final electron acceptor

c. The final products of the electron transport chain and oxidative phosphorylation are as follows: NAD+, FAD+, H₂O, and ATP

Answer:

Filtration

Explanation:

Metal carbonate is insoluble, it is possible to filter off the unreacted substances leaving the desired salt solution