One hundred students were surveyed about who they would vote for. What is
the best way to display the results? Explain your answer.

Answer:

Copper ii nitrate is the limiting reagent

Explanation:

The first thing to write here is the equation of reaction;

Fe + Cu(NO3)2 ——> Fe(NO3)2 + Cu

When we talk of limiting reagent, we mean the reactant that is totally consumed upon the completion of the chemical reaction

To get the limiting reagent, we can know this by calculating the mass of a specific product formed from each of the masses of the reactants

Now, we can use the amount of copper solid deposited by each of the reactants to know the limiting reagent here.

Since the mole ratio in all cases is 1 to 1, this will be easy

For the iron, the number of moles reacted is mass of iron/ atomic mass of iron

That would be 119.5/56 = 2.134 moles

Now since the mole ratio is 1 to 1, 2.134 moles of copper will be formed

Thus, the mass of copper produced from the iron will be number of moles * atomic mass of copper = 2.134 * 64 = 136.57g

Now from the nitrate, the number of moles is

mass mixed/ molar mass of copper nitrate

molar mass of copper nitrate is 188g/mol

number of moles is thus 279.5/188 = 1.487 moles

Since the mole ratio is 1 to 1, it means that the number of moles of copper produced too is 1.487 moles

The mass of copper produced from this is number of moles of copper * atomic mass of copper

That will be 1.487 * 64 = 95.15g

Now, since the copper nitrate produces less amount of copper solid, it is the the reagent to be consumed first and thus it is our limiting reagent

Answer: C) 1.6

Explanation: I got it right

Answer:

D

Explanation:

not all atoms would be the same size. As for they vary scaleing from left to right in the periodic table.

Answer:

student A

Explanation:

v = s ÷ t (speed = distance ÷ time)

v = 6m ÷ 2s

v = 3m/s

Explanation:

A because A galvanic cell consists of two half-cells, such that the electrode of one half-cell is composed of metal A, and the electrode of the other half-cell is composed of metal B; the redox reactions for the two separate half-cells are thus: An+ + ne− ⇌ A.

Answer:

A

Explanation:

Answer:

boiling water

Explanation:

its hotter

The scientific method is used by biologists and other scientists to pose inquiries about the natural world.

The first step in the scientific method is an observation, which prompts a question from the scientist. They then develop a theory—a verifiable explanation—that responds to the query.

A controlled experiment is a scientific test that is carried out under predetermined circumstances, meaning that only one (or a small number of) variables are altered at a time while all other variables are held constant. The element that differs between the experimental and control groups—in this case, the volume of water—is referred to as the independent variable. The response tested in an experiment to establish if a treatment had an impact is known as the dependent variable.

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The pH of the alkaline buffer consisting of 0.2 M aqueous ammonia and 0.1 M ammonium chloride is 9.55.

We must utilize the ammonium ion's (\({NH_4}^+\)) \(pK_a\) value of 9.25 to determine the pH of an alkaline buffer made up of 0.2 M aqueous ammonia (\(NH_3\)) and 0.1 M ammonium chloride (\(NH_4Cl\)). The following reaction takes place in this buffer solution:

\(NH_3 + H_2O\) ↔ \({NH_4}^+ + OH^-\)

The ammonium chloride will dissociate to form ammonium ion and chloride ion, but the ammonium ion will react with the hydroxide ion (\(OH^-\)) produced by the reaction above to form ammonia and water, effectively preventing any significant increase in the pH of the solution.

To calculate the pH of the buffer, we can use the Henderson-Hasselbalch equation:

\(pH = pK_a + log(\frac{base}{acid})\)

Where [base] is the concentration of the base (\(NH_3\)) and [acid] is the concentration of the acid (\({NH_4}^+\)).

Putting in the values, we get:

\(pH = 9.25 + log(\frac{0.2}{0.1})\)

⇒ \(pH = 9.25 + log(2)\)

⇒ \(pH = 9.25 + 0.301\)

⇒ \(pH = 9.55\)

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Answer:

"Forensic science is a critical element of the criminal justice system. Forensic scientists examine and analyze evidence from crime scenes and elsewhere to develop objective findings that can assist in the investigation and prosecution of perpetrators of crime or absolve an innocent person from suspicion."

Explanation:

Strictly from: https://www.justice.gov/olp/forensic-science#:~:text=Forensic%20science%20is%20a%20critical,an%20innocent%20person%20from%20suspicion.

Forensic science is any science used to aid in a criminal/legal investigation

2,2-dimethylpentane is the alkane that produces four isomeric monochloro derivatives. There are four different sorts of carbon atoms present, resulting in four different isomeric products.

Alkanes are organic substances that only include single-bonded hydrogen and carbon atoms and do not contain any other functional groups. Alkanes can be broken down into the following three groups: linear straight-chain alkanes, branched alkanes, and cycloalkanes. Alkanes have the general formula CnH2n+2. Saturated hydrocarbons also include alkanes. The only components of alkanes are carbon and hydrogen, making them the most basic and least reactive hydrocarbon type.

Isomerism is a phenomena where a substance has a similar chemical formula but a different structure. Isomers are the particular chemicals that displayed this resemblance.

The 4 different isomeric products are shown in the picture.

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Answer:

In 1932, the physicist James Chadwick conducted an experiment in which he bombarded Beryllium with alpha particles from the natural radioactive decay of Polonium. The resulting radiation showed high penetration through a lead shield, which could not be explained via the particles known at that time.

Explanation:

Answer:

1 cal = 0.004187 kJ

1,500,000 cal = 6280.5 kJ

Hydrothermal solutions are hot subsurface waters that are rich in minerals and gases. These waters are formed when groundwater or seawater is heated by the Earth's mantle and rises to the surface through cracks in the crust. When the hot water comes in contact with rocks and minerals, it dissolves them and becomes enriched with minerals and gases.

The minerals found in hydrothermal solutions include sulfur, copper, gold, silver, and zinc, among others. These minerals are often deposited around the vent or opening through which the water exits, creating mineral deposits known as hydrothermal vents. Hydrothermal solutions are also known to contain gases such as hydrogen sulfide, carbon dioxide, and methane.

These gases can create unique ecosystems around hydrothermal vents, providing energy and nutrients to organisms that live there. Overall, hydrothermal solutions are fascinating geological phenomena that have significant economic and ecological importance.

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Answer:

the oxidation number of those elements is 2 because some of them are molecules

5.75 liters of 3% hydrogen peroxide solution are included by the company in the container.

A measurement used to determine a number's value out of 100 is the percentage.

Due to that,

Hydrogen peroxide solutions in various containers have concentrations of 35% and 3%.

Since the corporation wants an 8-liter container with a 12% hydrogen peroxide concentration.

Use the allegation and combination properties,

35 3 12

9 : 23

Total quantity equals 23x + 9x = 32x.

Since the business requests 8 liters,

Consequently, 32x = 8 x = 1/4.

The concentration of 3% hydrogen peroxide will be equal to = 23x = 23/4 = 5.75.

5.75 liters of 3% hydrogen peroxide solution are needed.

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There is no direct involvement of \(Cu(NO_3)_2\) in the mole ratio calculation as it is not a reactant with \(AgNO_3.\)

The balanced chemical equation for the given reaction is:

\(2AgNO_3 + Cu -- > Cu(NO_3)_2 + 2Ag\)

According to this equation, the mole ratio between \(AgNO_3\) and Cu is 2:1, which means that for every 2 moles of \(AgNO_3\) used, 1 mole of Cu is consumed.

There is no direct mole ratio between \(AgNO_3\) and \(Cu(NO_3)_2\) or between \(AgNO_3\) and Ag. However, we can calculate the mole ratio between \(AgNO_3\) and Ag using the stoichiometric coefficients in the balanced equation.

For every 2 moles of \(AgNO_3\) used, 2 moles of Ag are produced. Therefore, the mole ratio between \(AgNO_3\) and Ag is 2:2 or simply 1:1.

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Answer:

135.80 g of Ag

Explanation:

\(40gCu *\frac{1mol Cu}{63.546g Cu} *\frac{2mol Ag}{1molCu} *\frac{107.868g Ag}{1mol Ag}\)

~ 135.80 g of Ag

Answer:

They're never found as individual elements in nature because they are so reactive.

Explanation:

Halogens are a highly reactive group of elements. They are usually found combined in nature.

Answer:

Density=mass/volume

= 570/2280

=0.25g/ml

To solve the financial dilemma, the chemical company can consider using the excess silver nitrate solution to synthesize silver nanoparticles, which have various applications in industries.

Silver nanoparticles can be synthesized by reducing silver ions with a reducing agent, and silver nitrate can serve as a source of silver ions.

One possible reaction for the synthesis of silver nanoparticles using silver nitrate is the reduction of silver ions with sodium borohydride (NaBH4). The reaction can be represented as:

AgNO3 + NaBH4 → Ag nanoparticles + NaNO3 + B2H6

In this reaction, silver nitrate is the oxidizing agent, which accepts electrons, while sodium borohydride is the reducing agent, which donates electrons to reduce the silver ions. The reaction also produces sodium nitrate and borane gas as byproducts.

The synthesized silver nanoparticles can be sold to various industries, generating revenue for the company and potentially reducing their debt. The company can also consider optimizing the synthesis process to increase the yield and purity of the silver nanoparticles, which can increase their market value.

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Chemical equation shows that the reactants change and form the products as a result of the reactants and products being rearranged during the reaction which result in different combinations in the products.

This is referred to as a written representation of the process that occurs during a chemical reaction and contains the reactants and products involved and an example is

H₂ + O₂ ⇒ H₂O

It shows that reactants change and form the products because the  reactants and products are rearranged during the reaction and there is also a different combinations in the products.

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When keto-enol equilibrium has been reached, the compound with the largest percentage of enol is 1,2 cyclo hexanedione.

The chemical compound 1,2-cyclohexanedione has the formula (CH2)4(CO)2. It is one of three cyclohexanediones that are isomeric.

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oxygen, sulfur and selenium as they are all in the same group of the periodic table - they are all chalcogens

In order to analytically find the transfer function, H(s), of the pH electrode, we can model it as a second-order passive low-pass filter consisting of two RC circuits in series.

The transfer function can be obtained by determining the ratio of the output voltage to the input voltage in the frequency domain.

Let's denote the Laplace transform variable as 's'.

The transfer function H(s) can be expressed as: H(s) = Vout(s) / Vin(s)

For a second-order passive low-pass filter, the transfer function can be written as:

H(s) = 1 / (s + s(R₁C₁ + R₂C₂) + R₁R₂C₁C₂)

Where R₁, R₂ are the resistances in the two RC circuits, and C₁ C₂ are the corresponding capacitances.

Now, let's assume the time constant

τ = R₁C₁ =R₂C₂ = 2 seconds (as given),

we can substitute this into the transfer function:

H(s) = 1 / (s² + 4s + 4)

Simplifying the transfer function further, we can factorize the denominator:

H(s) = 1 / ((s + 2)²)

So, the transfer function of the pH electrode, H(s), is:

H(s) = 1 / ((s + 2)²)

This transfer function represents the relationship between the measured pH (output) and the actual pH (input) of the electrode.

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The complete question should be

The response of a pH electrode can be modeled as a first order or second order passive low pass filter (i.e. two RC circuits in series). A limitation of commercial pH electrodes is their slow response time, which is typically 2 seconds (i.e. = 2 s).

Analytically, find the transfer function, H(s), of this electrode. This transfer function is defined as the measured pH (output) divided by the actual pH (input).

Answer:

Explanation:

in metal IE 1 < IE 2 < IE 3. why

Compound, according to our last session.

With this experiment, we can conclude that when ATP synthase binds to ATP and the ATP synthase rotates.

Definition of ATP Synthase Adenosine triphosphate (ATP) is produced by the enzyme ATP synthase during the process of cellular respiration. The primary source of energy used by cells is ATP.

a catalytic enzyme that uses inorganic phosphate and ADP to create ATP The big protein enzyme known as ATP synthase, which produces energy for the cell, is the location to which angiostatin binds.

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It's bcoz due to the small atomic size oxygen atom which is more electronegative

The central bright fringe on a single-slit diffraction experiment refers to the bright spot in the middle of the diffraction pattern. When the width of the slit through which the light passes is reduced, the central bright fringe becomes narrower and more intense.


1. In a single-slit diffraction experiment, light waves pass through a narrow slit and diffract, or spread out, creating a pattern of alternating bright and dark fringes.The central bright fringe corresponds to the region where the waves from different parts of the slit constructively interfere, resulting in a bright spot.

3. The width of the central bright fringe is determined by the width of the slit. If the slit is wider, the central bright fringe will be wider.When the width of the slit is reduced, the central bright fringe becomes narrower because there is less diffraction occurring. The narrower slit allows less room for the waves to spread out, leading to a narrower bright spot.


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Answer:

a is balanced

Explanation:

a) reactant/ product

(2x2)=4c / 4c

(2x6)=12h / 12 h

14o / (8o+6o)=14 o