what is the hydronium ion (h3o ) concentration in milk if it has a ph of 8.2? a. 2.75 × 10–4 b. 6.31 × 10–9 c. 3.64 × 103 d. 1.58 × 108

Answer: C. Atoms cannot be subdivided, created, or destroyed. This is the correct answer

Answer:

A leaf needs carbon dioxide and water for photosynthesis. ... For carbon dioxide to enter, the stomata on the surface of the leaf must be open. As you have seen, transpiration draws water from the roots into the leaf mesophyll.

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The molar mass of a substance can be calculated by dividing the mass of the substance by its number of moles.

However, the number of moles can be calculated using the following formula:

PV = nRT

Where;

0.92 × 1.6 = n × 0.0821 × 287

1.47 = 23.56n

n = 1.47/23.56

n = 0.624moles

Molar mass = 0.314g ÷ 0.624mol

Molar mass = 0.503g/mol

Therefore, the molar mass of a 0.314-gram sample of gas having a volume of 1.6L at 287K and 0.92 atm is 0.503g/mol.

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Performing a reaction in a vacuum chamber to control the experiment is a valid approach to prevent external variables from impacting the reaction.

However, it may not be sufficient to determine if the reaction is endothermic or exothermic and measure the amount of energy absorbed or given off. This is because the vacuum chamber only isolates the reaction from the environment, but it does not provide a way to measure the energy changes that occur during the reaction. To measure the energy changes, the scientist should use techniques such as calorimetry, which directly measures the heat absorbed or released by the reaction.

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Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Answer:element x

Explanation:because element x is shiny and hard and that's a property of metals and metals are good conductors of heat and electricity

The chemical equation for Direct Combination of Cobalt (III) and nitrogen, with the product given can be represented as given : Cobalt (III) + nitrogen → Cobalt nitride (Co3N2)When Cobalt (III) and nitrogen are combined using direct combination method, the product formed is Cobalt nitride (Co3N2).

The balanced chemical equation for this reaction is shown below.2 Co (III) + 3 N2 → Co3N2.Cobalt nitride is a blackish gray powder with a melting point of 1750 °C and a density of 6.5 g/cm3. Cobalt nitride is an important metal nitride that is used in the preparation of cobalt metal catalysts, magnetic alloys, and other materials.

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There are two properties that can be used to identify an element: the atomic number or the number of protons in an atom. The number of neutrons and number of electrons are frequently equal to the number of protons, but can vary depending on the atom in question.

Of the options given, lipids are considered a macronutrient.

Macronutrients are nutrients that the body requires in large amounts to function properly and maintain health. The three primary macronutrients are carbohydrates, proteins, and fats (lipids). Lipids are a type of nutrient that includes fats, oils, and cholesterol, and they are essential for the body's energy production, insulation, and the formation of cell membranes.

Vitamins and minerals, on the other hand, are considered micronutrients, which are nutrients that the body requires in smaller amounts but are still essential for proper health and functioning. Vitamins are organic compounds that help regulate various bodily functions, while minerals are inorganic substances that are necessary for proper cellular function, enzyme activity, and other bodily processes.

Therefore, option (a) lipids is the correct answer, as it is the only macronutrient among the given options.

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At 824.1 torr + 55.9°C, dry butane has a of 0.937 L. The basic formula for size is length, breadth, and height, as volume opposed to length, width, and height for the surface of a rectangular shape.

Any three-dimensional solid's volume is the area it takes up. The shapes of these solids include cubes, cuboids, cones, cylinders, and spheres. Forms come in a wide range of volumes.

Volumes will be calculated using three different techniques: geometrically (measured lengths); water displace; and pycnometry, to demonstrate the effects of precision on data.

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The reaction that requires platinum as a catalyst is the  B. reduction of an aldehyde or ketone.

This reaction occurs when an aldehyde or ketone is treated with hydrogen gas in the presence of a platinum-based catalyst. The resulting product is  alcohol. This reaction is important in the production of alcohols, aldehydes, and ketones from their precursors. The catalyst helps to break the chemical bonds of the molecules and increase the reaction rate.

In addition to being used for the reduction of aldehydes and ketones, platinum can also be used to catalyze the oxidation of an aldehyde or ketone. In this reaction, an aldehyde or ketone is treated with an oxidizing agent, such as oxygen or ozone, in the presence of a platinum-based catalyst. This reaction is used to produce carboxylic acids and esters. Both of these reactions require the use of a platinum-based catalyst, which helps to speed up the reaction rate.

In summary, the reaction that requires platinum as a catalyst is the reduction of an aldehyde or ketone. Platinum can also be used to catalyze the oxidation of an aldehyde or ketone. Both of these reactions are important for the production of alcohols, aldehydes, and ketones from their precursors. Therefore the correct option is  B

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Answer:

13.8g

Explanation:

Remember that density is equal to mass over volume

d=m/v

rearrange the problem and you get dv=m

(0.92g/mL)(15mL)=13.8g

Answer:

Lichens love clean air

Explanation:

Lichens love clean air too - in fact, their sensitivity to air pollution means they make great air quality indicators. Like small signposts, these curious organisms can tell us a lot about the air we are breathing.

Answer:

f-block

Explanation:

Answer:

See Explanation

Explanation:

From the data given an argument for either reactant as limiting can be presented. The Limiting Reactant is that reactant which when consumed the reaction stops as the remaining reactant does not have any reagent to react with.    

Based on this definition, if one adds a small quantity of AgNO₃ solution to a large quantity of copper wire the interaction will spontaneously react with copper metal undergoing oxidation forming CuNO₃ followed by formation of the reduced form of silver precipitate until all of the AgNO₃ is consumed and the reaction stops. In this case, the AgNO₃ is the limiting reactant and the copper will remain in excess.      

On the other hand and based on this definition of limiting reactant, one can add a small amount of copper wire to a concentrated solution of AgNO₃ and the same reaction will spontaneously occur. However, in this reaction system the reaction would proceed until all of the copper wire is consumed (dissolved) and the reaction stops leaving an excess of unreacted AgNO₃ in solution with CuNO₃ and reduced Ag.

Problems dealing with limiting reactants require specifying the  quantities of each reactant from which identification for the limiting reactant can be specified. One simple way to ID the limiting reactant is to convert all given reactant quantities to moles followed by dividing each by its respective coefficient from the balanced rxn equation. The smaller value will be the limiting reactant.  

Decreasing the TBCl concentration will not affect the rate constant in this experiment. The rate constant is determined by the specific reaction and temperature conditions and is independent of the reactant concentrations.

The rate constant (k) is a proportionality constant that relates the rate of a reaction to the concentrations of the reactants. However, the rate constant itself is not affected by the concentrations of the reactants. It is determined by the specific reaction and temperature conditions.

The rate of a chemical reaction can be expressed using the rate equation, which typically includes the concentration terms for the reactants raised to certain powers.

These powers, known as reaction orders, can be determined experimentally. However, the rate constant is a separate factor in the rate equation and is not dependent on the reactant concentrations.

By decreasing the TBCl concentration, the rate of the reaction may be affected, as the rate is directly proportional to the reactant concentrations.

However, the rate constant itself remains unchanged. The rate constant is influenced by factors such as temperature, presence of catalysts, and the nature of the reacting species, but not by the concentrations of the reactants.

Therefore, decreasing the TBCl concentration will not affect the rate constant in this experiment.

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Answer:

Explanation:

Since the temperature of the gas is constant , we use Boyle's law formula

P₁ V₁ = P₂ V₂

P₁ = 2.5  x 10⁵ Pa

V₁ = 250 x 10⁻⁶ m³

V₂ = 3.5 x 10⁻³m³

P₂ = ?

Putting the values in the equation

2.5  x 10⁵ x 250 x 10⁻⁶ = 3.5 x 10⁻³ P₂

P₂ = 2.5  x 25 / 3.5 x 10⁻³

= 17.86 x 10³ Pa

= .1786 x 10⁵ Pa

= .1786 x 10⁵ / 1.013 x 10⁵ atm

= .176 atm

When a coin is flipped, it has two possible outcomes: heads or tails. Therefore, for each individual flip, there are 2 possible outcomes.

To calculate the total number of possible outcomes when the coin is flipped 10 times, we need to consider that each flip is independent of the others. This means that the outcomes of each flip do not affect the outcomes of subsequent flips.

Since there are 2 possible outcomes for each individual flip, the total number of outcomes for 10 flips can be found by multiplying the number of outcomes for each flip together:

Total number of outcomes = 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2

Simplifying this expression, we have:

Total number of outcomes = 2¹⁰

Calculating 2¹⁰, we find:

Total number of outcomes = 1024

Therefore, when a coin is flipped 10 times, there are a total of 1024 possible outcomes. Each outcome represents a unique combination of heads and tails for the 10 flips.

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So I entered the answer, which is a=b=c=e>d, but it says it's incorrect.  the final temperature from the initial temperature, multiplying it by the mass, and multiplying it again by the water's specific heat.

Why is water's specific heat so high?

Hydrogen bonds between water molecules are what give water its remarkable thermal conductivity. Hydrogen bonds are disrupted and water molecules can move freely when heat is absorbed. Hydrogen bonds are created and release a significant quantity of energy when the temperature of water drops.

Why does temperature-related specific heat rise?

The average kinetic energy of the molecules increases as the substance heats up. The collisions generate sufficient energy to support rotation. Rotation

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Answer:

C) Cl2

Explanation:

Water (H2O), Ammonia (NH3), and Hydrochloric aid (HCl) are all polar. Cl2 is the only non-polar out of the answers and the electrons are shared equally.

Answer:

79

Explanation:

Answer:

P-waves compression waves while S-waves are shear waves.

Explanation:

P- waves has the ability to travels through solid, liquid and gaseous medium while S-waves travels through only solid medium and restricted by liquid and gaseous medium. P-waves is a type of seismic wave that will reach first to the recording station as compared to S-waves because P-waves moves faster that S-waves that moves slower so that's why P-waves reach first on the recording station that is located 500 miles away.

According to the electron sea model, the melting points of metals are not as extreme as the boiling points. Therefore, the given statement is correct is true.

The Electron Sea Model's whole hypothesis relies around the behavior of atoms throughout this bonding. The movement of unpaired electrons between positively charged metal ions in a mesh is known as metallic bonding.

According to the electron sea model, the melting points of metals are not as extreme as the boiling points. This is because the cations and electrons are - in a metal. It does not take much energy for a solid to become liquid. But metallic bonds are very - , so it does require a lot of energy to separate atoms from the cations in their sea of electrons. This statement is true.

Therefore, the given statement is correct is true.

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The final volume of the gas is 31.4 L when cooled from 45.0°C to 12.0°C.

The Charles's law states the relationship between the volume and the temperature of a gas when the pressure is constant. We can use the formula for the relationship between volume and temperature of a gas: \(\frac{V_{1} }{T_{1} }\) = \(\frac{V_{2} }{T_{2} }\)

where \(V_{1}\) and \(T_{1}\) are the initial volume and temperature, and \(V_{2}\) and \(T_{2}\) are the final volume and temperature.

We are given \(V_{1}\) = 35.0 L and \(T_{1}\) = 45.0°C = 45.0°C + 273.15 = 318.15 K,

and we need to find \(V_{2}\) when \(T_{2}\) = 12.0°C = 12.0°C + 273.15 = 285.15 K .  

Now by using the formula:

35.0 L / 318.15 K = \(V_{2}\) / 285.15 K

\(V_{2}\) = (35.0 L / 318.15 K) × 285.15 K

\(V_{2}\) = 31.4 L

Therefore, the final volume of the gas is 31.4 L when cooled from 45.0°C to 12.0°C.

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Answer: OH−.

Explanation: Hydroxide, any chemical compound containing one or more groups, each comprising one atom each of oxygen and hydrogen bonded together and functioning as the negatively charged ion OH-.

Answer:

Combustion is familiar to all of us, but many do not realize that it is essentially a chemical reaction. In the process of combustion, two ingredients (biomass and oxygen) are combined in a high temperature environment to form carbon dioxide, water vapor, and heat

Explanation:

Combustion of Fossil Fuels. Combustion is a reaction with oxygen. In the case of the combustion of fossil fuels, the combustion reaction is what we think of as a burning process. In the combustion reaction, the species reacting with the oxgyen is oxidized (because oxygen is very electronegative).

Answer:

Explanation:

no. of moles of butane = 5.87g / 58.124 = 0.1009mol

since O2 is excess, limiting reagent is butane

from the equation, 2 moles of butane will reacted to produce water = 10 moles

therefore, 0.1009 moles of butane produced water = (0.1009 x 5) = 0.5050 moles

Weight of H2O formed = 0.5050 x 18.015 = 9.10 grams

The mass of aluminum chloride formed during the neutralization reaction of aluminum hydroxide and hydrochloric acid is 10.43g.

The balanced chemical equation for the reaction is as follows:`

Al(OH)_{3} + 3HCl \rightarrow  AlCl_{3} + 3H2O

To calculate the mass of aluminum chloride produced, we first need to determine the limiting reactant between the aluminum hydroxide and hydrochloric acid in the reaction. Then we will use the stoichiometry of the balanced equation to find the mass of aluminum chloride formed.

Molar mass of HCl = 1.00794 + 35.453 = 36.46094 g/mol

Number of moles of HCl = Mass of HCl/Molar mass of HCl= 15.57/36.46094= 0.427 mol

The balanced equation for the reaction shows that the stoichiometry of aluminum hydroxide and hydrochloric acid is 1:3. That is, one mole of aluminum hydroxide reacts with three moles of hydrochloric acid to produce one mole of aluminum chloride.

Therefore, the amount of aluminum hydroxide needed to react with 0.427 moles of HCl is = Number of moles of Al(OH)_{3} = 0.427/3 = 0.142 mol

The actual mass of aluminum hydroxide used is not given but it is stated that there is excess of it in the reaction. So we can assume that all the hydrochloric acid reacts with the aluminum hydroxide.

We know that the actual yield of the reaction is 55.1%. Therefore, the theoretical yield of aluminum chloride can be calculated as follows: Theoretical yield of AlCl_{3} = Number of moles of Al(OH)_{3} x Molar mass of AlCl_{3} = 0.142 x [26.98 + 3(35.45)] = 0.142 x 133.33 = 18.93g.

Therefore, the actual yield of aluminum chloride is 55.1% of the theoretical yield, which is: Actual yield of AlCl_{3} = 0.551 x 18.93 = 10.43g.

Therefore, the mass of aluminum chloride formed is 10.43 g.

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Answer:

Upon analysis of the results, a hypothesis can be rejected or modified, but it can never be proven to be correct 100 percent of the time. For example, relativity has been tested many times, so it is generally accepted as true, but there could be an instance, which has not been encountered, where it is not true.

Explanation:

Electrons tend to occupy the lowest available energy level.

This is in accordance with the Aufbau principle, which states that electrons fill orbitals in order of increasing energy levels. Electrons prefer to occupy lower energy orbitals because they are more stable, and therefore, require less energy to maintain their current state. The electron configuration of an atom describes the arrangement of its electrons in various orbitals.

The energy levels of electrons in atoms are described using the principal quantum number (n). The first energy level (n = 1) is the lowest energy level, and it is closest to the nucleus. As the value of n increases, so does the energy level of the electron, and the distance from the nucleus increases as well. In summary, electrons tend to occupy the lowest available energy level because they are more stable and require less energy.

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