Water can dissolve other substances. Which factor best contributes to this property of water?.

Answer:

probably c

Explanation:

Answer: I feel like the correct answer is choice C but I really don’t know how to explain it..

Answer:

Florine has 9 atomic number so it has 9 electrons. So, add 1 to the number of electrons it has. 9 + 1 = 10. F-

Explanation:

Answer:

9 electrons

Explanation:

The rate of reaction of the value of KIS 3 and [A] and [B] are each 2M is: 24 (mol/L)/s (Option B)

In chemistry, the rate of reaction describes how quickly a chemical reaction develops.

It is frequently described in terms of either the concentration of a reactant that is spent in a unit of time or the concentration of a product that is generated in a unit of time (amount per unit volume).

Recall that the rate equation is:
Rate = K[A]²[B]

Hence:

Concentration of A = 2M

Concentration of B = 2M

K = 3

Taking the values and substituting them, we have:

Rate = 3 (mol/L)⁻³/s×[2]² ×[2]

Rate = 24 (mol/L)⁻³/s

The rate of reaction can be used as a valuable diagnostic tool. We may devise strategies to increase production by learning how quickly things are created and what slows down reactions.

This knowledge is necessary for the industrial production of various chemicals, such as:

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Answer:B

Explanation:

Drew added yeast and sugar to lukewarm water and placed it in a flask. Drew concluded that the bubbles indicated a chemical change. The correct option is B)

A chemical change is a change when the identity of a substance changes, and it converts into a new substance with new characteristics and a new identity.

When iron comes in contact with oxygen, it changes into rust, and it is a chemical change. A chemical change is a transformation in which the substance's chemical composition is altered through atom rearrangement. Atomic alterations cause changes in the molecular structure.

In the reaction, when yeast reacts with lukewarm water it forms bubbles, and in cold water, yeast does not perform well.

Therefore, the correct option is B) the bubbles indicated a chemical change.

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: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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The normal range of pH levels in blood and tissue fluids in the human body is approximately 7.35 to 7.45. This range is slightly alkaline, indicating a slightly basic or basic condition.

A strong acid is a substance that completely dissociates in water, releasing a high concentration of hydrogen ions (H+). This results in a low pH value. Strong acids are highly reactive and can cause severe burns or damage. Examples include hydrochloric acid (HCl) and sulfuric acid (H2SO4).

A weak acid, on the other hand, only partially dissociates in water, releasing a lower concentration of hydrogen ions (H+). This results in a higher pH value compared to strong acids. Weak acids are less reactive and tend to be less harmful. Examples include acetic acid (CH3COOH) and carbonic acid (H2CO3).

The main difference between strong acids and weak acids lies in their degree of dissociation and the concentration of hydrogen ions they release when dissolved in water, which affects their acidity and pH value.

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Answer:

10 must be added

Explanation:

The balanced half-reaction:

The reactant H₂O₂(aq) is oxidized to form O₂(g) and 2OH-(aq).

The hydroxide ions (OH-) act as the reducing agent, accepting the electrons lost by hydrogen peroxide.

The balanced half-reaction for the oxidation of aqueous hydrogen peroxide (H₂O₂) to gaseous oxygen (O₂) in a basic aqueous solution can be represented as follows:

H₂O₂(aq) -> O₂(g) + 2OH-(aq)

This equation represents the oxidation of hydrogen peroxide, where it loses electrons and forms oxygen gas. In the basic solution, hydroxide ions (OH-) are present to balance the charges in the reaction.

Therefore,

In the balanced half-reaction:

The reactant H₂O₂(aq) is oxidized to form O₂(g) and 2OH-(aq).

The hydroxide ions (OH-) act as the reducing agent, accepting the electrons lost by hydrogen peroxide.

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The high-density brine drains into the water beneath the ice and in the process, the sea ice freshens while the salinity of the underlying water decreases, becoming less dense (Option C).

Sea ice is usually less salty than the ocean water it freezes from. During the process of ice formation, salt in the ocean water is expelled from the ice as it grows; most of the salt is ejected into the ocean but some remain trapped inside pockets of brine within the ice. When the air temperature falls below the freezing point of seawater (usually around -1.8 °C), water molecules start to form ice crystals, which grow and aggregate into a solid sheet of ice.

During this process, the salt rejected by the growing ice also accumulates, causing the salinity of the remaining brine to increase. Some of the brine is encapsulated within ice crystals, but most are trapped in the spaces between neighboring crystals.

Thus, the correct option is C.

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The major organic product obtained from the given reaction sequence is 2-bromo-1-chlorobenzene.

In the first step of the reaction sequence, NaN02 (sodium nitrite) and HCl (hydrochloric acid) are used to convert an amine group (-NH2) to a diazonium salt (-N2+). This step is known as diazotization. The specific compound involved in the reaction is not mentioned in the question, so we'll assume it is an aromatic amine.

In the second step, HBr (hydrobromic acid) and CuBr (copper(I) bromide) are added. The diazonium salt reacts with HBr to form a bromoarene compound. The CuBr serves as a catalyst for the reaction.

The product obtained from the reaction sequence is 2-bromo-1-chlorobenzene. The amine group (-NH2) in the starting compound is replaced by a bromine atom (-Br) through the diazotization and bromination reactions.

It's important to note that without specific details about the starting compound, the exact product cannot be determined. However, based on the given reaction sequence, 2-bromo-1-chlorobenzene is the expected major organic product.

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change in boiling point temperature is always larger upon adding a solute.

When the vapor pressure of a liquid reaches the pressure of the gas above it, the liquid boils. The temperature at which a liquid will boil decreases with decreasing gas pressure above the liquid.

Up until the critical pressure, the boiling point rises with an increase in pressure, at which time the characteristics of gas and liquid are similar. Beyond the critical point, the boiling point cannot rise. Similar to how the triple point is attained, the boiling point falls with falling pressure. It measures the point at which a chemical boils, to put it simply. A higher boiling point denotes more intermolecular forces and, thus, less vapor pressure, similar to a higher melting point.

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So the correct option is B. Price variance. Price variance term describes difference between actual price of inputs and the standard price of inputs.

Price variance refers to the difference between the actual price paid for inputs and the standard price set for those inputs. It is a measure of the discrepancy between the expected or budgeted cost or actual cost of acquiring materials, goods, services. Price variance helps in evaluating the effectiveness of procurement activities and assessing the impact of price fluctuations on overall costs. A favorable price variance indicates that inputs were obtained at a lower cost than expected, while an unfavorable price variance suggests higher costs than anticipated.

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What is true about the particles?

D. They stay in place and vibrate.

The heat energy absorbed or released during a chemical reaction is known as enthalpy change or ΔH.

A reaction that is exothermic, or releasing energy, will have a ΔH value that is negative.

A reaction that is endothermic, or absorbing energy, will have a ΔH value that is positive.

Enthalpy change is defined as the heat exchanged between the system and the surroundings at a constant pressure.

It is denoted by ΔH, which is equal to the change in heat (q) of the system at a constant pressure.

The value of enthalpy change (ΔH) determines whether a reaction is exothermic or endothermic.

When the value of ΔH is negative, the reaction is exothermic, releasing energy in the form of heat to the surroundings.

When the value of ΔH is positive, the reaction is endothermic, absorbing energy from the surroundings.

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By using the ideal gas law to get volume we have"

Where v is volume, T is temperatute, n is number of moles, R is the molar gas constant and P is pressure. At STP P= 101,325 Pa, T= 273.15 K and R= 8.314 J/mol K

We must first convert mass to moles:

By substituting this value into the ideal gas law we have:

1.9502e-6L of H2 gas reacted at STP

Answer:

a new scientific discovery that benefits the environment

Answer:

Image

Explanation:

An electrolytic solution is a solution that has the ability of conducting electricity. Electrolytic solutions contain ions in which it conducts electricity from those ions. Ions are charged atoms. This solution (refer to image) has ions, as represented by the + and - symbols.

0.56 V  is the standard potential, e∘cell∘, for this galvanic cell.

The standard reduction potential can be calculated by subtracting the standard reduction potential for the reaction occurring at the cathode from the standard reduction potential for the reaction occurring at the anode. The minus sign is necessary because oxidation is the polar opposite of reduction. The total cell potential can be calculated using the formula E0cell=E0red+E0oxid. Step two is to find a solution. Before the two reactions may be integrated, the number of electrons gained in the reduction must match the number of electrons lost in the oxidation

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The standard potential for the given galvanic cell is 0.477 V

The electrode potential is the electromotive force of a galvanic cell built using a standard reference electrode and another electrode whose potential is to be found.

There are two types of electrode potential

Oxidation potential - The potential associated with oxidation reaction is known as oxidation potential

Reduction potential - The potential associated with reduction reaction is known as reduction potential

At the anode, oxidation occurs

\(Sn(s)\rightarrow Sn^{2+}(aq)+2e^-\)

At the cathode, reduction occurs

\(Cu^{2+}(aq)+2e^-\rightarrow Cu(s)\)

\(E^o_{cell} =E^o_{cathode} -E^o_{anode}\)

        = 0.337 - (-0.140)

        = 0.477 V

Thus, The standard potential for the given galvanic cell is 0.477 V

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Disclaimer: The question was given incomplete on the portal. Here is the complete question

Question: What is the standard potential, E∘cell, for this galvanic cell? Use the given standard reduction potentials in your calculation as appropriate.

\(Sn^{2+}(aq)+2e^-\rightarrow Sn(s)\), E°red=−0.140 V

\(Cu^{2+}(aq)+2e^-\rightarrow Cu(s)\), E°red=+0.337 V

A solution contains 0.0420 M Ca²⁺ and 0.0980 M Ag⁺ . If solid na3po4 is added to this mixture, the phosphate species that precipitate out of solution first is Ca₃(PO₄)₂.

The molarity of [Ca²⁺] = 0.0420 M

The molarity of [Ag⁺] = 0.0980 M

The dissociation is as :

Ag₃PO₄  --->  3Ag⁺   +  PO³⁻₄

Solubility product constant Ksp of Ag₃PO₄  = 8.89 × 10⁻¹⁷

Ksp = [  Ag³⁺] [  PO³⁻₄]

[  PO³⁻₄] =  1.0 × 10⁻¹³

The solubility product constant of Ca₃(PO₄)₂ = 2 × 10⁻³²

Ca₃(PO₄)₂ --->  3Ca²⁺   +   2PO₄³⁻

[PO₄³⁻] = 4.9 × 10⁻¹⁵

Thus,  Ca₃(PO₄)₂ will precipitate the first.

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Answer:

121.3 ml

Explanation:

Mole wts

Na    22.989 x 2

C    12.011

O 15.999 x 3      total = 105.986

45 grams is   45/105.986 of a mole

    45/105.986  in one liter would be .424584 M

   .424585 mole / x liter = 3.5

   x = .1213 liter = 121.3 ml

The primary goal of the carburetor is to atomize and vaporize the fuel before mixing it with air in varying proportions, making it the device that is used for atomizing and vaporizing the fuel before mixing it with air in varying proportions.

The device that is used for atomizing and vaporizing the fuel before mixing it with air in varying proportions is Carburetor. A carburetor is a device that blends air and fuel for an internal combustion engine. It is often located on the top of an engine on a direct engine-to-carburetor link, and it controls how much air and fuel are mixed.The carburetor must also supply the engine with a spark plug to ignite the fuel/air mixture in each cylinder.

The carburetor must provide a fuel/air mixture that is consistent with the engine's changing demands, which vary with engine speed, load, and temperature. A carburetor is responsible for enriching the fuel/air mixture when the engine is cold and for leaning the mixture as the engine warms up. As well, it is also responsible for regulating the fuel/air mixture at part-throttle levels, where the engine spends most of its time when driving.

When an engine is running at full throttle, it is operating at wide-open throttle (WOT), and the carburetor provides the richest fuel/air mixture possible.The carburetor, like most engine systems, is a complex and sensitive device that must be correctly tuned to perform properly. The primary goal of the carburetor is to atomize and vaporize the fuel before mixing it with air in varying proportions, making it the device that is used for atomizing and vaporizing the fuel before mixing it with air in varying proportions.

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Disulfide bond forms when the sulfur atoms in two adjacent protein chains are joined together.

When the sulfur atoms in two adjacent protein chains come together, strong chemical side bonds form. Weak physical side bonds are caused by the attraction of opposite electrical charges. Polypeptide chains that are coiled. Chemical bonds that connect amino acids end to end in long chains.

These peptide subunits can form complex structures by bonding with other peptides. Chemical bonds of various types hold proteins together and bind them to other molecules. Examine the chemical bonds that are responsible for protein structure. A protein's primary structure is made up of amino acids linked together in a chain.

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Answer:

Molarity = 1.12 mol/L

Explanation:

To make an aqueous solution of Na₂O, the concentration will be calculated by: concentration (c) (or molarity) = number of moles present (n) ÷ volume needed (V) (in litres)

since we don't have moles, we can calculate moles by:

number of moles (n) = mass present (m) (in grams) ÷ molar mass (M) (in grams per mole), which we can find using a standard IUPAC Periodic Table

∴ n(Na₂O) = m/M = 34.8/(22.99×2+16.00) = 0.56147 mol

Now we have the number of moles present, we can calculate concentration:

∴ c(Na₂O) = n/V = 0.56147/0.50L = 1.12 mol/L

Here, the metal A displaces metal B from its solution. Hence, the metal A has lower positive  reduction than B. Hence, the reduction potential of B is higher and it is less strong reducing agent.

The reduction potential of a metal electrode is the measure of the tendency of it to lose or gain electrons and is the equilibrium potential difference developed due to separation of charges at the metal - solution interface when a metal is kept in contact with solution of its own.

The higher the negative reduction potential, greater the reducing capacity of the metal. Hence, metals with higher positive potential are easily reducing or they are strong oxidizing agents.

The metals with strong reducing power displaces other metals with lower reducing power from their solution. Here, A is strong reducing agent. Hence, it can displace B from its salt solution and B reduces to its metallic form.

Therefore, the order of A and B in reducing their reduction capacity is A>B.

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Semiconductors show the property of both the conductor and insulator. They are more effective than metals as their valence electron can free flow by the sun's energy. Thus, option B is correct.

Semiconductors are substances and materials that exhibit intermediate properties of conductors and insulators. They are solid materials that can conduct electrical charges due to the added impurity or change in temperature.

They have a valence electron in their outer shell that can absorb the energy from the sun to get excited. This leads to the flow of the charge in the semiconducting substance more easily.

Therefore, option B. the semiconductors can absorb the extra energy is correct.

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Your question is incomplete, but most probably your full question was, Semiconductors are more effective than metals as converters of solar radiation into electricity because

A. it is easier for the atoms of a semiconductor to absorb solar energy and to move from place to place within the solid, thereby conducting electricity.

B. the energy contained in sunlight gives the valence electrons in the semiconductor atoms the extra energy they need to "flow" throughout the solid.

C. metals melt much too easily under direct sunlight and, as liquids, lose their ability to conduct electricity.

D. solar radiation has sufficient energy to knock electrons completely off the metal surface, making it impossible for the electrons to "flow" from atom to atom and conduct electricity.

Answer:

Physical change

Explanation:

Answer:

See explanation

Explanation:

A balanced chemical reaction equation has the same number of atoms of each element on both sides of the reaction equation.

Hence, for the reaction between KOH and H2SO4, the balanced chemical reaction equation is;

H2SO4(aq) + 2KOH(aq) ---------> K2SO4(aq) + 2H2O(l)

Complete ionic equation;

2H^+(aq) + SO4^2-(aq) + 2K^+(aq) +2OH^-(aq) -------> SO4^2-(aq) + 2K^+(aq) + 2H2O(l)

Net ionic equation;

2H^+(aq) + 2OH^-(aq) -------> 2H2O(l)

O-linked oligosaccharides are commonly attached to the —oh group of amino acids.

Glycosylation is a post-translational modification of proteins in which glyco-linked oligosaccharides are added to proteins. This process is found in eukaryotes, primarily in the endoplasmic reticulum and Golgi apparatus, and involves the enzymatic attachment of sugar units to specific sites on a protein molecule.

These short chains of saccharide sugar residues, called glycosyl sidechains, are examples of glycoconjugates which are covalently attached to hydroxyl groups on the protein.

The most common types of glycosylation sites are the N-linked glycosylation sites, which have an attached sugar group, often an N-acetylglucosamine or N-acetylmannosamine connected to an asparagine sidechain, and the O-linked glycosylation sites, which have a sugar group, usually a galactose or mannose sugar, attached to a hydroxyl group on serine, threonine or hydroxylysine residues.

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Answer:

The momentum would send things flying eastward

Explanation:

Since earth is rotating at around a speed of thousand miles per hour you could expect things to fly eastward.