CHEMISTRY, HELP!!! (Please explain as well if you can because I have at least five more questions like this after I finish this one)

Answer:

\(from \: the \: equation : \\ 1 \: mole \: of \: methane \: is \: produced \: by \: 2 \: moles \: of \: hydrogen \\ 8.7 \: moles \: of \: methane \: will \: produce \: (8.7 \times 2) \: moles \\ = 17.4 \: moles \\ 1 \: mole \: of \: methane \: weighs \: 16 \: g \\ 17.4 \: moles \: will \: weigh \: (17.4 \times 16) \: g \\ = 278.4 \: g\)

Enantioselective are reactions that generate products that are enriched in one enantiomer.

Enantiomers are pairs of molecules that exist in two forms that are mirror images of each other but are not superimposable. The enantiomers are chemically identical in all other respects. Enantiomeric pairs are distinguished by the direction in which they rotate polarized light when dissolved in solution, either dextrorotatory (d or +) or levorotatory (l or -). Hence the term optical isomer.

The enantioselectivity of a chromatography system is defined as the preferential interaction of one enantiomer with a chiral selector. It is usually determined as the ratio of the retention factors of the two enantiomers in a chiral chromatography or electrophoresis system.

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Answer:

See explanation below

Explanation:

When the bromine (Br₂) reacts in presence of FeBr₃ with the isopropylbenzene, the isopropylbenzene is a ring activator, therefore, it will promote the substitution in the ortho and para positions. However, as the Isopropyl is voluminic, the ortho position would have steric hindrance and hence, this product is not formed in greater proportions. Instead, the para position becomes more available to reaction, and this product is formed in majority.

The mechanism of reaction can be seen in the following picture, along with the products of the reaction

Hope this helps

The concentration of starch in the original sample is 1 g/L.

The concentration of the original sample is determined as follows:

After diluting the sample 4-fold, the concentration of the starch = 1/4 of the original concentration.

The absorbance of the diluted sample is related to the absorbance of the original sample by the following equation:

A₁ = A₂x dilution factor

where;

Substituting the given values, we get:

A₁ = 0.5 x 4 = 2

Now we can use the Beer-Lambert Law to find the concentration of the original sample:

A = εbc

where

Since we do not know the value of ε or b, we will assume that they are constant and cancel out when we compare two measurements. Therefore:

A₁ / A₂ = c₁ / c₂

Substituting the given values, we get:

2 / 0.5 = c₁ / (c₂ x 4)

Solving for c₁:

c₁ = (2 / 0.5) x (1 / 4)

c₁ = 1 g/L

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When a bond's rating is upgraded from CC to CCC, it signifies an improvement in the creditworthiness of the issuer. This higher rating indicates a lower risk of default for the bond.

The impact on the price of the bond is not directly related to the upgrade in rating. However, when a bond's rating improves, it generally becomes more attractive to investors. This increased demand can lead to an increase in the price of the bond.

On the other hand, the required yield of the bond will generally decrease. As the creditworthiness of the issuer improves, investors perceive less risk and are willing to accept a lower yield. Therefore, the required yield, which represents the return investors demand for holding the bond, tends to decrease.

To summarize, when a bond's rating is upgraded from CC to CCC, it can lead to an increase in the bond's price and a decrease in the required yield. These changes are driven by the improved perception of the issuer's creditworthiness.

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Answer:

I CANT

Explanation:

Answer:

phisical i think

Explanation:

chemical would be baking powder in a pancake, the pancake would be in turn more brown cause of baking powder mixing with flower.

Scientists at IBM used scanning tunnelling microscopy to write the initials of their corporation using 35 individual xenon atoms. The mass of the xenon atom is 7.631 x 10⁻²¹ g

The concept involved in the given problem is mass conversion. The mass conversion establishes connections between grams, moles and atoms. Mole can be used to relate mass of substance to the number of atoms.

Mole is the chemical unit to express the amount of a substance. One mole consists of Avogadro’s number of atoms that is

6.022 x 10²³ atoms

1 mol = 6.022 x 10²³ atoms

The Avogadro’s number acts as a conversion factor between the number of atoms and the number of moles.

The number of moles of a substance can be calculated using following formula:

Number of moles = Number of atoms divided by Avogadro number

The moles of a substance can be converted to grams of the substance using the following formula:

Grams = Moles x Atomic mass

Step: 1

Calculate the moles of Xe atoms by using the relation as follows:

Number of moles = Number of atoms divided by Avogadro number

Thus,

mol of Xe = number of atoms / Avogadro number

= 35/6.022x10²³

= 5.812 x 10⁻²³ mol

Explanation:

The Avogadro’s number acts as a conversion factor between number of atoms and moles. So, divide the number of atoms by Avogadro’s number to get the moles of Xe atoms.

Hint:

Convert the moles of Xe to grams.

Step: 2

Calculate the total mass of letters from the moles of Xe using the following relation:

Grams of Xe = (Moles of Xe) x (Atomic mass of Xe)

=(5.812 x 10⁻²³ mol) x (131.29 gmol⁻¹)

= 7.631 x 10⁻²¹ g Xe

Mole of a substance relates mass of substance to the number of atoms. Convert the number of atoms to moles of Xe using Avogadro’s number. Then convert moles to grams of Xe atoms by multiplying moles with atomic mass of Xe.

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The statement "their color varies with pressure" is not a property of a gas.

Some properties of gas are given below.

Expansion: Gases have the ability to expand and fill the entire volume of their container. They do not have a fixed shape or volume.

Compressibility: Gases are highly compressible. Under increased pressure, gas particles can be forced closer together, reducing the volume they occupy.

Low Density: Gases have low densities compared to liquids and solids. This is due to the large distances between gas particles.

Diffusion and Effusion: Gases can easily mix and spread out through other gases, a process known as diffusion. Additionally, gases can pass through small openings, such as tiny pores or small holes, which is called effusion.

Fluidity: Gases can flow and exhibit fluid-like behavior. They do not possess a fixed shape and can easily move and take the shape of their container.

High Kinetic Energy: Gas particles have high kinetic energy and are in constant random motion. They collide with each other and the walls of the container, creating pressure.

No Definite Volume or Shape: Gases do not have a definite volume or shape. They completely conform to the shape and volume of their container.

Therefore, he statement "their color varies with pressure" is not a property of a gas.

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Answer:

The most common drinking water contaminants are microorganisms, nitrate, and arsenic.

Explanation:

Answer:

it is chemical , sewage , factory pollution , wastes, etc

Answer: Oxidation happens at the anode and reduction happens at the cathode.

At the anode of a lead-storage battery while it is in use to start a car, the following reaction occurs: Pb(s) → Pb²⁺(aq) + 2e⁻.

In a lead-storage battery, the anode is the negative electrode where oxidation takes place during discharge. During the process of starting a car, the battery provides electrical energy to power the starter motor. At the anode, the reaction involves the oxidation of solid lead (Pb) to form lead ions (Pb²⁺) in an aqueous solution and release two electrons (2e⁻). This reaction is represented as:

Pb(s) → Pb²⁺(aq) + 2e⁻

The lead ions formed at the anode combine with sulfate ions (SO₄²⁻) from the electrolyte to form lead sulfate (PbSO₄) as a solid precipitate. This reaction occurs at the positive electrode, known as the cathode.

During the charging process, the reactions at the anode and cathode are reversed, and the lead sulfate is converted back to lead and lead dioxide, respectively, through a series of chemical reactions. This allows the battery to be recharged and ready for the next use.

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Answer:

The answer is 0.073

Explanation:

Final step: 0.73 x 10^-1

Answer:

i believe it is strong acids, strong bases, and salts.

Explanation:

Hope this helps : )

Explanation:

Hey there!

The volume of an object: The volume of a water displaced by the object.

So, at first we need to find the volume of a water displaced by the object.

On the first figure the initial volume of a water is 60.5ml . Similarly, in second figure when an object is immersed then its volume is 90ml.

Now, volume of a water displaced =?

We have;

Displaced volume = final volume - initial volume.

Or, displaced volume = (90 - 60.5) ml.

= 29.5ml.

As per the condition, volume of a water displaced by the object = volume of an object.

Therefore, the volume of an object is 29.5ml.

Hope it helps...

Answer:

120000drops

Explanation:

Average blood in human blood = 6L - 6*1000 = 6000ml

1 ml of blood is equal to 20 drops

6000ml of blood makes 20*6000 = 120000 drops

Combustion reactions require oxygen, a fuel, and give off energy.

Combustion reactions, also known as burning, are chemical reactions that occur when a fuel combines with oxygen in the presence of an ignition source. The main answer to the question is that combustion reactions require all of the mentioned components: oxygen, a fuel, and they give off energy.

Oxygen is a crucial component in combustion reactions because it acts as an oxidizer. It combines with the fuel, which can be any combustible material such as wood, gasoline, or natural gas. The presence of oxygen enables the fuel to undergo oxidation, releasing energy in the form of heat and light.

Without a fuel source, combustion cannot occur. The fuel provides the carbon and hydrogen atoms necessary for the reaction. Different fuels have varying energy content and combustion characteristics, which can affect the intensity and efficiency of the reaction.

When a fuel and oxygen react, a chemical reaction takes place, resulting in the release of energy. This energy is in the form of heat and light, which is why combustion reactions often produce flames. The energy released during combustion can be harnessed for various purposes, such as heating, cooking, or powering engines.

In summary, combustion reactions normally require oxygen as an oxidizer, a fuel source to provide the necessary atoms, and they give off energy in the form of heat and light. These reactions are essential for various practical applications and play a vital role in our daily lives.

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One way that the water cycle can be changed by the construction of a housing development is through the alteration of natural drainage patterns.

When a housing development is constructed, the natural landscape is often modified to accommodate the buildings, roads, and infrastructure. This can involve clearing vegetation, grading the land, and installing impervious surfaces like pavement and rooftops.

These changes can significantly affect the way water moves through the area and disrupt the natural water cycle of construction.

One notable impact is the alteration of drainage patterns. Natural landscapes typically have vegetation and soil that help absorb rainfall and facilitate infiltration into the ground.

However, in a housing development, the increased amount of impervious surfaces reduces the ability of water to infiltrate into the soil. Instead, rainwater tends to flow more quickly over these surfaces, increasing surface runoff.

Increased surface runoff can lead to changes in the timing, volume, and intensity of stormwater runoff. This can result in increased erosion, flooding, and a reduced amount of water infiltrating into the groundwater system.

Additionally, the alteration of natural drainage patterns can disrupt the replenishment of streams, rivers, and other water bodies, impacting their ecological health and water availability downstream.

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Answer:

the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.

Explanation:

if you need a definition of a word, you can look in a dictionary as well for future reference

Answer:

Temperature means the hotness or coldness of anything.

Explanation:

The exact definition is: "The degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch."

The skin of grapes contains an antioxidant called resveratrol. Determine the resveratrol functional groupings. Alcohol makes comprises the compound's functional group.

An organic molecule known as an alcohol has at least one hydroxyl functional group attached to a saturated carbon atom. The major alcohol ethanol, which is used as a narcotic and is the main alcohol contained in alcoholic beverages, was the substance to which the term "alcohol" originally referred.

Resveratrol is a naturally occurring polyphenol that can be found in a variety of foods, including grapes, berries, peanuts, and several medicinal plants. It has a stilbene functional group in its molecular structure.

Thus, The skin of grapes contains an antioxidant called resveratrol. Determine the resveratrol functional groupings. Alcohol makes comprises the compound's functional group.

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Answer:

Common pollutants produced by engines that burn fossil fuels are carbon dioxide, nitrogen oxides, sulfur dioxide, volatile organic compounds (VOCs), and particulates. Stoves, incinerators, and open burning produce carbon monoxide and carbon dioxide, as well as particulates.

Explanation:

A person weighing around 62 kg can jump from a height of 0.329 metres without breaking their legs.

Potential energy present in a jumper from height h. = m g h  

which, when the individual strikes the ground, entirely transforms into kinetic energy. Now, the human can only absorb a maximum of 200 J of energy.

m = 62 kg

g = 9.8 m/s²

⇒ m g h = 200 J

⇒ h = 200 J / (62 kg × 9.8 m/s²) = 0.329 m

Therefore, a person can only fall from a height of 0.30 m safely and without breaking both of their legs.

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The flame test can be effectively used to identify a cation in a solution because when a cation is placed in a flame, it will emit a different color with

visibile light.

Ions are charged particles that form when atoms gain or lose electrons. When an atom gains electrons, it forms negatively charged ions called negative ions. On the other hand, positively charged ions, called cations, are formed when atoms lose electrons. These ions can be detected in solution using special tests. The flame test involves exposing a joint to a flame and identifying the joint by flame color. The color of the flame test is due to the fact that electrons in metal cations are excited and jump to higher energy levels.

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A hydrocarbon that contains four carbon atoms with single bonds is a butane. In this case, its name has to end with -one because it contains a ketone functional group. Therefore, its name is butanone.

The structural form of the butanone is

Given that the compound is formed by Carbon, Oxygen, and Hydrogen molecular compounds because they are formed by nonmetals.

Answer: true

Explanation:

Answer:

Water's heat of vaporization is around 540 cal/g at 100 °C. The same amount of heat is exchanged or released in the phase shift during the condensation of 1 g water vapor to 1 g of water.

Explanation:

brainliest?

waters boiling point is 212F or 100C

Answer:

A is true NaCl

B is false K2Br

C is true

D false its only 0.03 percent

E is true

The addition of ice at the end of the heating process is important because it increases the solubility of the aspirin product.

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Answer: A mole of something means that there are 6.02 X 10^23 of that something. So, a mole of methane molecules is 6.02 X 10^23 methane molecules. So, 1.5 moles of methane will contain 1.5*(6.02 X 10^23) = 9.0 X 10^23 methane molecules

Explanation: