Water and chemical elements move through cycles called biogeochemical cycles. Select the best way to explain biogeochemical cycles. a. When chemicals move from the atmosphere to a living organism. b. When a chemical moves from an organism to the atmosphere then back to an organism. c. When organisms move from an organism to the atmosphere then back to an organism.

Answer:

15 because it is the closest

Explanation:

The percent by mass of acetic acid in the vinegar is 2.33%.

Below are the steps to solve the given problem using the data table given below:

Step 1: Calculate the mass of the vinegar. Given,Mass of flask and vinegar solution- 25.17gMass of flask- 15.12gMass of vinegar solution = Mass of flask and vinegar solution - Mass of flask= 25.17 g - 15.12 g= 10.05 g

Step 2: Calculate the moles of NaOH used in the titration.Molarity of NaOH solution is 0.1 M.Moles of NaOH = Molarity × Volume of NaOH usedMoles of NaOH = 0.1 M × 39.00 mL (since the initial volume of NaOH is 0.00 mL)Moles of NaOH = 0.0039 moles

Step 3: Determine the moles of acetic acid used in the reaction.The balanced chemical equation for the reaction between NaOH and acetic acid (the main component of vinegar) is given below:CH3COOH + NaOH → CH3COONa + H2OMoles of NaOH = Moles of CH3COOH (since they react in a 1:1 ratio)Moles of CH3COOH = 0.0039 moles

Step 4: Calculate the mass of acetic acid used in the reaction.Molar mass of acetic acid is 60.05 g/mol.Mass of CH3COOH = Moles of CH3COOH × Molar mass of CH3COOH= 0.0039 moles × 60.05 g/mol= 0.234 gStep 5: Calculate the percent by mass of acetic acid in the vinegar.Percent by mass of acetic acid = (Mass of CH3COOH / Mass of vinegar solution) × 100%= (0.234 g / 10.05 g) × 100%= 2.33%.

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Answer:

B Genetic diversity

Explanation:

Answer:

I think the answer is b.

Explanation:

:)

Hi there.

Thanks for chosing Brainly! How are you today?

Another name for Helium Nucleus is Alpha Particle.

Alpha Particles are the same as a Helium Nuclues, just a different word usage. They have the same definitions.

Thanks for your question.

- Tutor John

Final concentrations of acsch and tacrine in that reaction is 600x10⁻¹²mm.

The symptoms for mild to moderate Hypertension are managed by tacrine. Alzheimer's disease cannot be cured or prevented from worsening with tacrine. However, some Alzheimer's sufferers may benefit from tacrine since it helps them think more clearly.

The behavior, procedure, or event of responding. B: opposition or resistance to a power, influence, or movement, particularly: a propensity for an old-fashioned and typically obsolete social or political order or policy.

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Answer: D

Explanation:

Magnesium and calcium have similar chemical properties because they have the same number of electrons in their valence shells.

The valence/outermost shell of magnesium and calcium both has two electrons. An element's chemical characteristics are dictated by how its electrons are arranged in their orbits around the nucleus. The same number of protons and electrons means that an element's chemical behavior is fundamentally determined by its atomic number, which explains why Mg and Ca share the same chemical properties.

On the periodic table, magnesium and calcium are both located in the second vertical column. Magnesium and calcium are alkaline earth metals, just like all Group 2 elements. Both of them are salt-forming soft, silver-colored metals that respond fast to halogen gases like fluorine, chlorine, and bromine.

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Answer:

the air around you

Explanation:matter is physical like the particles in the air or the oxygen in the air. so rocks, earth the sun, anything you can touch is matter. even gasses.

The mass in grams of uranium is 820.255g

Mass is the any substances that would be calculated by using their moles

Here given data is

uranium in 1 mol = 289.1 mol

And the formula is

n = W/V

W = required mass = ?

M = molar mass of uranium = 238.05g/mol

n = moles of uranium = 289.1 mol

Then putting this value

W =  289.1 mol×238.05g/mol

W = 820.255g

The mass, in grams of 289.1 mol of uranium is 820.255g

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there is approximately 2.4 hours left for the bag to empty. gauge peripheral IV in the left forearm at a rate of 125 ml per hour. It also mentions that there are 300 ml remaining in the bag and that the IV can be discontinued when this bag's infusion is complete.

To answer the question, we need to determine how long it will take for the bag to empty based on the infusion rate. If the bag contains 1,000 ml of solution and the infusion rate is 125 ml per hour, we can calculate the time it will take to empty the bag by dividing the volume in the bag by the infusion rate:
Time = Volume / Rate
Time = 1000 ml / 125 ml per hour
Time = 8 hours
Therefore, it will take 8 hours for the bag to empty.

Since the question states that there are 300 ml remaining in the bag, we can determine how much time is left for the bag to empty based on the remaining volume and the infusion rate:
Time left = Remaining volume / Rate
Time left = 300 ml / 125 ml per hour
Time left = 2.4 hours

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Answer:

it is an endothermic reaction

Explanation:

This is because there is a rise in temperature from 20 to 46. this means that the reaction takes in heat from the suuroundings

Of those listed, the most significant role for nitrogen in the atmosphere is to act as a major component of the air we breathe.

Most nitrogen enters ecosystems via certain kinds of bacteria in soil and plant roots that convert nitrogen gas into ammonia (NH3). This process is called nitrogen fixation. A very small amount of nitrogen is fixed via lightning interacting with the air. Nitrogen makes up about 78% of Earth's atmosphere and is essential for the survival of many living organisms, including humans. Additionally, nitrogen is involved in the cycling of nutrients in ecosystems and plays a critical role in the growth and development of plants.

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Energy bond of N-Br can't be calculated only with the data of energy bond of N-N and Br-Br. The energy bond of N-Br is 243kJ/mol

Energy bond can be determined by using experiment. To calculate energy bond of N-Br by using energy bond of N-N and Br-Br need 1 more data of the difference of Enthalpy reactant and product. In this case the reaction can be determine as below:
N-N + Br-Br = 2 N-Br

The equation can be used is:
Energy bond N-N + Energy bond Br-Br - Energy bond of 2 N-Br = Enthalpy

If the enthalpy of the reaction not provided, energy bond of N-Br can not be determined. But, you can check on the reference for N-Br energy bond.

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The chemical equation for the reaction of Sn2(aq) to Sn4(aq) in an acidic or basic solution is:Sn2(aq) + 2e- → Sn4(aq)

What is the chemical equation for the reaction of Sn2(aq) to Sn4(aq) in an acidic or basic solution?

In this reaction, Sn2(aq) is being oxidized to Sn4(aq) by losing two electrons (2e-). The oxidation state of Sn increases from +2 to +4.

It's important to note that the phases of the substances involved in the reaction are not specified in the question.

However, based on the naming conventions, "(aq)" indicates that the substances are in aqueous solution, meaning they are dissolved in water.

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by rounding them to the neerest 10

for a chemical reaction to be only spontaneous at low temperatures , ∆S°<0 and ∆H°<0 .

In a chemical reaction, bonds between molecules of the reactant are broken and new bonds between molecules of the product are established to create a new substance.

When two or more molecules combine to create a new product, the process is known as a chemical reaction (s).

Reactants are substances that interact to make new substances, whereas products are those substances that result from the interaction.

Chemical reactions are crucial to many professions, traditions, and even aspects of daily life. They frequently occur in our everyday surroundings, such as the rusting of iron, the firing of pottery, the fermentation of wine, and so forth.

A chemical change that is typically seen with physical changes like precipitation, heat production, colour change, etc. must take place in a chemical reaction.

No atom is created or destroyed in a reaction between two atoms, ions, or molecules, but instead a new product is created from the reactants.

Pressure, temperature, and the concentration of the reactants all have an impact on and affect the rate of reaction.

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A statement best describes the entropy that occurs when two gases are added to the same container: The gases will disperse and mix due to the increase in entropy for both gases.

Entropy is a thermodynamic quantity which measures the energy in a system per unit temperature that cannot be used to do work. Perhaps the most common manifestation of entropy is (following the law of thermodynamics), the entropy of a closed system always increases and under conditions of heat transfer, heat energy moves from the component with a higher temperature to the component with a lower temperature. In a system where the heat is isolated, the entropy only goes in one direction (not a reversible process). It is necessary to measure the entropy of a system to determine that energy cannot be used to do work on thermodynamic processes.

These processes can only be carried out by energy that has been transformed, and when energy is converted into work, it theoretically has a certain maximum efficiency. During the work/effort, entropy will accumulate in the system, which then is dissipated in the form of wasted heat.

In classical thermodynamics, the concept of entropy is defined in the second law of thermodynamics, which states that the entropy of an isolated system always increases or remains constant. Thus, entropy can also be a measure of the tendency of a process, whether the process tends to be "entropy" or will proceed in a certain direction. Entropy also shows that heat energy always flows spontaneously from an area with a higher temperature to an area with a lower temperature.

Thermodynamic entropy has the dimensional energy divided temperature, which has International Units joules per kelvin (J/K).

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Answer:

then this picture 11 Venkat and one person is

Explanation:

join date 20th December is not a problem with the topic of your name and address of the topic of your name and address of the topic of your name and address of the topic of your life in general is not available in the equation is the topic of your name and address

so nothing in this picture .

\(\qquad\)\( \pink{\bf\longrightarrow { Molar \:mass \:of \:H₂O:-} }\)

\(\qquad\)\( \sf \longrightarrow 1\times +16\)

\(\qquad\)\( \sf \longrightarrow 18g\)

\(\qquad\)____________________

Let's calculate the number of moles present in 89g of H₂O.

\(\qquad\)\( \purple{\bf\longrightarrow { No \:of \:moles = \dfrac{Given \:mass}{Molar\: mass}}}\)

\(\qquad\)\( \sf \longrightarrow \dfrac{89}{18}\)

\(\qquad\)\( \sf \longrightarrow 4.94\: moles\)

We know –

Number of molecules:-

\(\qquad\)\( \purple{\bf \longrightarrow No \: of \: moles \times Avogadro \: number}\)

\(\qquad\)\( \sf \longrightarrow 4.94×6.022×10²³\)

\(\qquad\)\( \sf \longrightarrow 2.98 ×10²⁴\)

\(\qquad\)\(\purple{ \bf \longrightarrow 2.98×10²⁴ molecules}\)

\(\qquad\)____________________

The substances can only be properly identified if we carry out flame tests and qualitative analysis on the samples.

We know that the only way that we can be able to identify a substances in chemistry is to be able to perform a series of tests on the substances. In this case, we are told that we have the substances potassium carbonate, potassium chloride, potassium iodide, sodium chloride in solution.

We can only be able to identify the solutions by the use of flame tests and qualitative analysis. Flame test would show the colors that are characters of the cation while we could use qualitative analysis to identity the anion present.

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Answer:

MgO.

Explanation:

charges of both satisfy one another (balanced) -- producing a compound MgO.

The Maillard reaction creates brown pigments in cooked meat in a very specific way: by rearranging amino acids and certain simple sugars, which then arrange themselves in rings and collections of rings that reflect light in such a way as to give the meat a brown color.

The advanced Maillard reaction involves breaking down the Amadori product into a variety of fission products that are composed of the sugar-amino complex. In the ultimate Maillard reaction, amino compounds and sugar fragments condense to form polymerized proteins and brown pigments called melanoidins. In the Maillard reaction, an organic chemical process, reducing sugars and amino acids combine to create a complex brew of chemicals. The distinct flavour and aroma of browned food are the result of this process. The French chemist Louis Camille Maillard's name is associated with the Maillard reaction.

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A presumptive test determines that a sample is definitely not a particular substance.

Presumptive tests can be described as analyzing a sample in medical and forensic science that the sample is definitely not a certain substance or the sample probably is the substance.

For example, the test will show either that a sample is not blood or that sample is probably blood. Further chemical tests are required to prove that the substance is blood.

Confirmatory tests can be described as the tests needed to confirm the analysis. Confirmatory tests cost more than presumptive tests therefore presumptive tests are generally done to see if confirmatory tests are necessary.

Therefore, the presumptive tests determine that a sample is definitely not a certain substance.

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When calcium carbonate (CaCO3) reacts with hydrochloric acid (HCl), the gas produced is carbon dioxide (CO2).

The balanced chemical equation for the reaction is:

CaCO3(s) + 2HCl(aq) → CO2(g) + H2O(l) + CaCl2(aq)

In this reaction, the acid (HCl) reacts with the carbonate ion (CO3^2-) from calcium carbonate. The carbonate ion acts as a base, accepting a proton (H+) from the acid, forming carbonic acid (H2CO3). Carbonic acid is unstable and decomposes to form water and carbon dioxide gas. The carbon dioxide gas is released as bubbles.

Therefore, during the reaction between calcium carbonate and hydrochloric acid, carbon dioxide gas (CO2) is produced. This gas can be observed as effervescence or bubbling in the reaction mixture.

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Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

\(a = \frac{f}{m} \\ \)

f is the force

m is the mass

From the question we have

\(a = \frac{80000}{45000} = \frac{80}{45} \\ = 1.77777...\)

We have the final answer as

Hope this helps you

If solutions of barium nitrate and sodium sulfate are mixed and then poured into a filter, the solid remaining on the filter will be Barium sulfate. So option B is correct.

This occurs because barium nitrate and sodium sulfate undergo a double displacement reaction, resulting in the formation of the insoluble salt barium sulfate, which precipitates out of the solution and can be filtered. The reaction can be represented as:

Ba(NO3)2 + Na2SO4 -> BaSO4 + 2NaNO3

Barium sulfate is a solid salt that is insoluble in water, meaning it does not dissolve and remains as a solid precipitate. This allows the solid barium sulfate to be easily separated from the solution through filtration.

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Answer:

Barium Sulfate

Explanation:

BaSO4 is insoluble in water so it remains on a filter.

The answer is (3)

Answer:

Explanation:

NaOH + KNO3 --> NaNO3 + KOH. combustion. CH4 + 2 O2 --> CO2 + 2 H2O. single displacement. 2 Fe + 6 NaBr --> 2 FeBr3 + 6 Na. double displacement.