which of the given aldohexoses is dextrorotatory? d-glucose d-galactose d-gulose d-mannose cannot predict

To solve this we must be knowing each and every concept related to mole and  and its calculations. Therefore, 388.15g  is the mass of 3.5 moles of CaCl\(_2\).

A mole is merely a measuring unit. In reality, it is one of International System of Units' seven foundation units (SI). When basically determines are insufficient, new units are created.

Chemical reactions frequently occur at levels that use grams would be inappropriate, but using actual figures of atoms/molecules/ions would also be misleading.

It's much easier to write' mole' than '6.02x10²³' whenever you wish to refer to a huge number of things. That is essentially why and how this particular component was created.

mole =given mass ÷ molar mass

moles of CaCl\(_2\) = 3.5 moles

Molar mass of CaCl\(_2\) =110.9g/mol

mass of  CaCl\(_2\) =3.5 moles × 110.9g/mol

                        =388.15g

Therefore, 388.15g  is the mass of 3.5 moles of CaCl\(_2\).

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Answer:

Decomposition

Explanation:

A decomposition reaction is a type of reaction in which a compound is broken down into its constituent elements sometimes under the influence of heat.

When  iron (III) hydroxide is heated,new products are formed according to the equation; 2Fe(OH)3 -----------> Fe2O3 + 3H2O.

This is a thermal decomposition reaction.

Answer: I think they get will paralysed and some of the impulses may not be able to get through.

Answer:

yes is it yes yes yes yes yes yes yes yes yes yes

The concentration of Cd²+ in 1 L of the solution is approximately 2.94 x 10⁻⁸ M.

To calculate the concentration of Cd²+ in the solution, we need to consider the formation of the complex ion (Cd(NH₃)₄)²⁺ and the equilibrium between Cd²+ and the complex ion.

Step 1: Write the balanced equation for the formation of the complex ion:

Cd²+ + 4NH₃ ⇌ (Cd(NH₃)₄)²⁺

Step 2: Write the equilibrium expression for the formation of the complex ion:

Kf = [Cd(NH₃)₄]²⁺ / [Cd²+][NH₃]⁴

Step 3: Substitute the known values into the equilibrium expression:

Kf = [Cd(NH₃)₄]²⁺ / ([Cd²+] * [NH₃]⁴)

Since we are neglecting complexes containing fewer than four ammonia ligands, the concentration of NH₃ remains unchanged.

Step 4: Rearrange the equation to solve for [Cd(NH₃)₄]²⁺:

[Cd(NH₃)₄]²⁺ = Kf * [Cd²+] * [NH₃]⁴

Step 5: Substitute the known values:

Kf = 1.8 x 10⁻⁷

[Cd²+] = 10⁻³ mol / 1 L = 10⁻³ M

[NH₃]⁴ = 1.5 mol / 1 L = 1.5 M

Step 6: Calculate [Cd(NH₃)₄]²⁺:

[Cd(NH₃)₄]²⁺ = (1.8 x 10⁻⁷) * (10⁻³) * (1.5)⁴

Step 7: Calculate [Cd²+]:

Since one Cd²+ ion reacts with one (Cd(NH₃)₄)²⁺ complex, the concentration of Cd²+ is equal to the concentration of (Cd(NH₃)₄)²⁺:

[Cd²+] = [Cd(NH₃)₄]²⁺ = (1.8 x 10⁻⁷) * (10⁻³) * (1.5)⁴

By calculating the expression, we find that the concentration of Cd²+ in 1 L of the solution is approximately 2.94 x 10⁻⁸ M.

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A renewable fuel called ethanol is created from various plant elements known as "biomass."

Thus, Ethanol is used to oxygenate more than 98% of the gasoline sold in the United States. E10 (10% ethanol, 90% gasoline) is typically added to gasoline, which lowers air pollution.

Ethanol is also available in the form of E85 (also known as flex fuel), which can be used in vehicles that can run on any gasoline and ethanol mixture up to an 83% concentration.

Since ethanol has a greater octane rating than gasoline, it offers superior mixing qualities. Engine knocking is prevented and drivability is ensured by minimum octane number regulations for fuel.

Thus, A renewable fuel called ethanol is created from various plant elements known as "biomass."

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The concentration of A decreases and then levels out. Option A

In many chemical reactions, a reactant is consumed as the reaction progresses, leading to a decrease in its concentration over time. The reactant molecules are transformed into products, and as the reaction proceeds, the concentration of the reactant gradually diminishes.

At equilibrium, the concentrations of both reactants and products remain relatively constant over time, although they can coexist.

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Answer:

The correct options are;

1. 1,600

2. 100 Watts

A 23-30 watt CFL provides 1,600 lumens and is equivalent to a 100 Watts incandescent bulb

Explanation:

Brightness is measured in lumens and watts measure energy usage therefore with the use of an energy saving light bulb, the same lumination can be obtained at a lower energy usage.

According to a comparison chart for LED Lights vs. Incandescent Light Bulbs vs. Compact Fluorescents (CFLs) from USAI lightening website 23-30 watts CFL has a light output of 1,600 and is therefore produces enough light as a 100 Watts Incandescent Light Bulb

Also according to energy.gov website, CFLs save up to 75% energy such that a 23-30 watt CFL can produce the same illumination as a 100 watt incandescent bulb

Therefore we have, a 23-30 watt CFL provides 1,600 lumens and is equivalent to a 100 Watts incandescent bulb.

Answer:

1600 lumens, 100 watt incandescent

Explanation:

100% on edge (:

The inorganic substance with the chemical formula BaSO4 is barium sulfate (or sulphate). It is a tasteless, crystalline white substance that is insoluble in water.

A barium cation and a sulfate anion are the two elements that make up barium sulfate. There are four oxygen atoms joined to the sulfur. A sulfate salt of barium, known as BaSO4, is present in the mineral barite. It is a white crystalline substance that is soluble in strong acids but insoluble in water and alcohol.

Elements include both barium and bromine. Barium is a metal belonging to Group 2 of the modern periodic table, and bromine is a non-metal belonging to Group 17 (halogen).

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Answer:

"Avogadro's law is an experimental gas law relating the volume of a gas to the amount of substance of gas present. The law is a specific case of the ideal gas law. A modern statement is: Avogadro's law states that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules."

Answer:

Avogadro's law states that the equal volume of all gases at the same temperature and pressure contain the same number of molecule

Answer:

An organism's role within an ecosystem depends on how it obtains its food. Plants and animals obtain their food in very different ways, so they have very different roles in an ecosystem. The way in which an organism obtains food also affects its interactions with other organisms in the ecosystem.

Explanation:

The concentration of the Nitric acid solution : 0.114 M

Titration is a procedure for determining the concentration of a solution (analyte) by reacting with another solution whose known concentration (usually a standard solution) is called the titrant. Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range  

Titrations can be acid-base titration, depositional titration, and redox titration. An acid-base titration is the principle of neutralization of acids and bases  

Reaction

HNO₃ + NaOH → NaNO₃ + H₂O​

Concentration a standard solution  of sodium hydroxide :  0.0998 mol/dm³ , and the volume = 25 cm³

moles NaOH=

\(\tt mol=M\times V\\\\mol=0.0998\times 25\\\\mol=2.495~mlmoles\)

From the equation, mol ratio HNO₃ : NaOH = 1 : 1, so mol HNO₃ = mol NaOH=2.495 mlmoles

The volume of HNO₃ = 21.8 cm³, so the concentration :

\(\tt M=\dfrac{n}{V}\\\\M=\dfrac{2.495}{21.8}\\\\M=0.114\)

The concentration of the nitric acid solution is 0.11445 mol/dm³

From the question,

We are to calculate the concentration of the nitric acid solution

The given balanced chemical equation for the reaction is

HNO₃ + NaOH → NaNO₃ + H₂O​

This means 1 mole of HNO₃ is needed to completely neutralize 1 mole of NaOH

Using the formula

\(\frac{C_{A}V_{A} }{C_{B}V_{B}} = \frac{n_{A}}{n_{B}}\)

Where \(C_{A}\) is the concentration of acid

\(C_{B}\) is the concentration of base

\(V_{A}\) is the volume of acid

\(V_{B}\) is the volume of base

\(n_{A}\) is the mole ratio of acid

\(n_{B}\) is the mole ratio of base

From the given information

\(C_{B}= 0.0998\ mol/dm^{3}\)

\(V_{A} = 21.80 \ cm^{3}\)

\(V_{B} = 25.0 \ cm^{3}\)

From the balanced chemical equation

\(n_{A} = 1\)

\(n_{B} =1\)

Putting the parameters into the formula, we get

\(\frac{C_{A} \times 21.80 }{0.0998 \times 25.0} = \frac{1}{1}\)

Then,

\(C_{A} \times 21.80=0.0998 \times 25.0\)

∴ \(C_{A}=\frac{0.0998 \times 25.0}{21.80}\)

\(C_{A} =\frac{2.495}{21.80}\)

\(C_{A} = 0.11445 \ mol/dm^{3}\)

Hence, the concentration of the nitric acid solution is 0.11445 mol/dm³

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Explanation:

because of blood pressure

This problem is providing both the mole fraction and mass of magnesium chloride in an aqueous solution. Thus, the total moles of the solution are required and turned out to be 4.62 moles.

In chemistry, units of concentration are used to account for the relative amounts of solute and solvent in solid, liquid or even gaseous solutions.

Thus, several units are widely employed, yet this problem is about mole fraction, which relates the moles of the solute and the total moles of the solution as follows:

\(x=\frac{n_{solute}}{n_{total}}\)

Hence, given the mass of the solute, calcium chloride, we can calculate its moles as follows:

\(n_{solute}=22.2g*\frac{1mol}{95.21g}=0.231mol\)

Thereafter, we solve for the total moles of the solution and subsequently plug in the knowns:

\(n_{total}=\frac{n_{solute}}{x}\\\\n_{total}=\frac{0.231mol}{0.0500}\\\\n_{total}=4.62mol\)

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Answer:

True

Explanation:

In general, metals are located on the left of the periodic table. Nonmetals are on the right. This means that they are on opposite sides.  So the answer is True.

The groups can be ranked in increasing activating power in electrophilic aromatic substitution reactions as follows:
1. -Br
2. -CH₂CH₃
3. -OCH₃
4. -OCOCH₂CH₃


In electrophilic aromatic substitution reactions, activating groups donate electron density to the benzene ring, making it more susceptible to attack by electrophiles. The greater the electron-donating ability, the stronger the activating power.

-Br is a deactivating group due to its strong electron-withdrawing nature, making it the least activating group among the options.

-CH₂CH₃ is a weak activating group that donates electron density through the sigma bond. It is less activating compared to the other two groups.

-OCH₃ is a stronger activating group that donates electron density through the lone pairs of the oxygen atom. It is more activating than -CH₂CH₃ but less activating than -OCOCH₂CH₃.

-OCOCH₂CH₃ is the most activating group among the options. It is a strong activating group due to the presence of the electron-donating oxygen atoms in the ester group. It donates electron density through both the sigma bond and the lone pairs of the oxygen atoms.

Therefore, the ranking of the groups in order of increasing activating power is -Br, -CH₂CH₃, -OCH₃, and -OCOCH₂CH₃.

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crystallization is a process which helps to separate a pure solid from a solution in its crystal form. This is the in use to purify solid. For an example the salt we get from seawater can have many impurities in it. Hence, the process of crystallization is in use to remove these impurities.

Sugar and salt are examples of products where crystallization does not only serve as separation/purification technique, but where it is also responsible for getting crystals with the right size (and shape) for further application of the products.

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Answer:

Crystallization is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal. Some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas.

Sugar and salt are two mixtures that can be seperated by crystallization

Explanation:

Answer:

Two electrons fit in the first shell out from the nucleus and eight fit in the second. Every element with more protons than the two of Helium needs to work on shells outside the first one. one you get to ten, you have filled the first two shells.

In a water molecule, oxygen forms one covalent bond with EACH of TWO hydrogen atoms. As a result, the oxygen atom has a stable arrangement of 8 valence electrons. Each hydrogen atom forms only one bond because it needs only two electrons to be stable.

The diagrams show the arrangements of carbon atoms in diamond and in graphite. The diamond is sp³ hybridized and have tetrahedral shape while graphite is sp² hybridized and is hexagonal ring shaped structure.

Diamond containing carbon atoms are strongly bonded chemically with other four carbons. The carbon atoms are sp³ hybridized and make percept tetrahedral shape. Diamond used in jewelry makin g. they are used by surgeons in the cataract surgery. diamond is hard, used for cutting or drilling rock.

Graphite containing carbon atom are form the weak bond with weak forces. the carbon are sp² hybridized and make a hexagonal ring shape structure. The force in graphite in weak that makes it useful material.  it is used as lubricant. it is used in pencil. used in making electrodes.

The diagrams show the arrangements of carbon atoms in diamond and in graphite. The diamond is sp³ hybridized and have tetrahedral shape while graphite is sp² hybridized and is hexagonal ring shaped structure.

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The approximate resistance value at 45 degrees Celsius is around 5.8 ohms.

To calculate the value of the resistance temperature coefficient at 45 degrees Celsius using linear approximation, we can use the formula:

R(T) = R0 + α(T - T0),

where R(T) is the resistance at temperature T, R0 is the resistance at a reference temperature T0, α is the resistance temperature coefficient, and (T - T0) is the temperature difference.

Given that the resistance at 25 degrees Celsius is 5 ohms (R0 = 5) and the resistance at 50 degrees Celsius is 6 ohms (R(T) = 6), we can calculate the value of α.

6 = 5 + α(50 - 25),

Simplifying the equation:

1 = 25α,

Therefore, α = 1/25 = 0.04 ohm/degree Celsius.

Using the linear approximation, we can approximate the value of the resistance at 45 degrees Celsius:

R(45) = 5 + 0.04(45 - 25) = 5 + 0.04(20) = 5 + 0.8 = 5.8 ohms.

Therefore, the value of the resistance at 45 degrees Celsius is approximately 5.8 ohms.

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Answer:

I think its A. Earths gravity

Explanation:

Hope this answer helps!

Answer:

The number of protons, massive, positively charged nuclear particles defines the identity of the nucleus.

Woah. Vocabulary here.

An isotope is any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weight. There are 275 isotopes of the 81 stable elements, in addition to over 800 radioactive isotopes, and every element has known isotopic forms. Isotopes of a single element possess almost identical properties.

Helium is usually defined as an inert, gaseous element present in the sun's atmosphere and in natural gas, and also occurring as a radioactive decomposition product, used as a substitute for flammable gases in dirigible balloons. Symbol: He; atomic weight: 4.0026; atomic number: 2; density: 0.1785 g/l at 0 °C and 760 mm pressure.

Explanation:

The number of protons, massive, positively charged nuclear particles, gives Z, the atomic number, which defines the identity of the nucleus.

Z=1, "hydrogen",Z=2, "helium",Z=3, "lithium",...........Z=21, "scandium".

The nucleus may contain various numbers of neutrons, massive, neutrally charged nuclear particles, which gives to the existence of isotopes.

For hydrogen, \(Z=1\) by defintion. That is there is a proton in all hydrogen nuclei. Some hydrogen nuclei contain 1 neutron to give the deuterium isotope, \(^2H\) ; an even smaller number of hydrogen nuclei contain 2 neutrons, to give the tritium isotope, \(^3H\) ; Most atoms have a number of isotopes in different proportions.

To answer your question, the helium atom has \(Z=2\) ; i.e. there are 2 nuclear protons, which is what defines the atom as helium. The most common isotope of helium is \(^4He.^3He\) and \(^5He\) re known with vanishingly small abundances, and half lives.

This video discusses how to determine the number of subatomic particles in C-12 , C-14 , H-1 , H-2 and H-3 .

Thanks.

Answer:

Lines in the spectrum were due to transitions in which an electron moved from a higher-energy orbit with a larger radius to a lower-energy orbit with smaller radius. The orbit closest to the nucleus represented the ground state of the atom and was most stable; orbits farther away were higher-energy excited states.

Explanation:

There is an intimate connection between the atomic structure of an atom and its spectral characteristics. Atoms of individual elements emit light at only specific wavelengths, producing a line spectrum rather than the continuous spectrum of all wavelengths produced by a hot object. Niels Bohr explained the line spectrum of the hydrogen atom by assuming that the electron moved in circular orbits and that orbits with only certain radii were allowed. Lines in the spectrum were due to transitions in which an electron moved from a higher-energy orbit with a larger radius to a lower-energy orbit with smaller radius. The orbit closest to the nucleus represented the ground state of the atom and was most stable; orbits farther away were higher-energy excited states. Transitions from an excited state to a lower-energy state resulted in the emission of light with only a limited number of wavelengths Atoms can also absorb light of certain energies, resulting in a transition from the ground state or a lower-energy excited state to a higher energy excited state. This produces an absorption spectrum, which has dark lines in the same position as the bright lines in the emission spectrum of an element. Bohr's model revolutionized the understanding of the atom but could not explain the spectra of atoms heavier than hydrogen.

Answer:

Mammals do not have instincts, so they must learn all their behaviors from their parents in order to survive.

Sea turtles must survive on their own, while mammals spend time with their parents and learn how to survive as they grow.

Sea turtles are less intelligent than mammals and, thus, cannot learn new behaviors from their parents.

Explanation:

Sea turtles rely on instincts more than mammals do, beacuse to get food for their survival.

Insticts are the natural impulse or motivation which are present from the inborn time to perform some functions in order to react in some specific external stimuli.

Mammals do not react impulsively in any external conditions because they have members or friends from their famliy side, who will teach them how to behave or react. But turtles didn't have that special person, so they do work rely on instincts to get food or many other purposes.

Hence, to survive sea turtles rely on instincts more than mammals do.

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The mass of carbon in a 1 carat diamond is approximately 0.2 grams.

A diamond is composed entirely of carbon atoms arranged in a crystal lattice structure. The carat weight of a diamond refers to its mass, where one carat is equal to 0.2 grams. Since a diamond is made up of carbon atoms, the mass of carbon in a 1 carat diamond is also approximately 0.2 grams.

Diamonds are formed deep within the Earth's mantle under intense pressure and high temperatures. Carbon atoms undergo a process called crystallization, where they bond together in a repeating pattern to form the diamond's structure. This crystal lattice is incredibly strong and gives diamonds their unique properties.

The carat weight of a diamond is a measure of its size, with each carat equal to 0.2 grams. Therefore, a 1 carat diamond would have a mass of approximately 0.2 grams. Since diamonds are composed solely of carbon atoms, the entire mass of the diamond corresponds to the mass of carbon present.

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The numbers in the powers are the number of electrons in a specific orbital. so you can add them to find the atomic number

Answer:

Chemical Change

Explanation:

The explosion of fireworks is an example of chemical change. During a chemical change, substances are changed into different substances. In another words, the composition of the substance changes.

There would be 9.03 x  \(10^{23}\) particles in 13.5 grams of Beryllium.

Recall that 1 mole of a substance contains 6.02 x 10^23 atoms.

Number of moles in 13.5 grams of Beryllium = mass/molar mass

                    = 13.5/9

                       = 1.5 moles

Thus, total number of atoms in 1.5 moles Beryllium:

             = 1.5 x 6.02 x 10^23

                    = 9.03 x  \(10^{23}\)

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