determine the energy in joules of a photon whose frequency is 3.55 x10^17 hz( with units)

To determine the number of moles of hydrogen needed to crack one mole of the long saturated hydrocarbon chain (C40H82), we can analyze the reactants and products involved in the cracking reaction.

The cracking reaction is given as: C40H82 -> 3 C8H18 + n C2H6. From the equation, we can see that one mole of the long hydrocarbon chain (C40H82) produces three moles of octane (C8H18) and n moles of ethane (C2H6). Since the cracking process involves breaking the carbon-carbon bonds and forming new carbon-hydrogen bonds, the number of hydrogen atoms in the products should remain the same as in the reactant.

The long hydrocarbon chain (C40H82) contains 82 hydrogen atoms, and the products, 3 moles of octane (C8H18), contain (3 moles) * (18 hydrogen atoms/mole) = 54 hydrogen atoms. Therefore, the number of moles of hydrogen needed for cracking one mole of the long hydrocarbon chain can be calculated as: Number of moles of hydrogen = 82 - 54 = 28 moles. Hence, 28 moles of hydrogen are required to crack one mole of the long saturated hydrocarbon chain (C40H82).

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A solution of the ionic salt Lihco3 would have 11.3 pH.

In chemistry, salt exists as a chemical compound consisting of an ionic group of positively charged cations and negatively charged anions, which results in a combination with no net electric charge. A common example stands table salt, with positively charged sodium ions and negatively charged chloride ions.

The fragment ions in a salt compound can be either inorganic, such as chloride (Cl−), or organic, such as acetate (CH3CO−2). Each ion can be either monatomic, such as fluoride (F−), or polyatomic, such as sulfate (SO2−4).

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Answer:

The two fish are of the same species because they can mate with each other. Also, the characteristics of the blind cave fish enable them to live in caves. Eyes need energy. So, developing bodies with no eyes allowed these fish to function more efficiently.

Explanation:

plato answer

The alkyl halide needed to produce leucine from Gabriel synthesis is 2-bromobutane. The correct answer is: 2-bromobutane

Gabriel synthesis involves the reaction of phthalimide with an alkyl halide to form the corresponding primary amine. The phthalimide is then hydrolyzed to release the amine. In this case, 2-bromobutane will react with phthalimide to form N-(2-butyl)phthalimide, which can be hydrolyzed to produce 2-amino butane, the precursor for leucine. The other options listed, 1-bromo-2-methylpropane, 2-bromopropane, and bromomethane, do not have a sufficient alkyl chain length to form the necessary precursor for leucine. Therefore, 2-bromobutane is the alkyl halide needed for the synthesis of leucine in the Gabriel synthesis. Hence, 2-bromobutane is the correct answer

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A measure of the ability of an atom in a chemical compound to attract electrons from another atom in the compound is called Electronegativity.

Electronegativity, symbolized as χ, is the tendency for an atom of a given chemical detail to draw shared electrons when forming a chemical bond. An atom's electronegativity is stricken by both its atomic quantity and the gap at which its valence electrons live from the charged nucleus. Electronegativity is described as the capacity of an atom in a molecule to attract electrons to itself.

Electronegativity is the degree of an atom's capacity to draw shared electrons to itself. on the periodic table, electronegativity normally increases as you pass from left to proper throughout a duration and decreases as you circulate down a collection.

Electronegativity is a chemical belonging that describes the tendency of an atom or a practical organization to draw electrons toward itself. The electronegativity of an atom is suffering from each of its atomic variety and the distance that its valence electrons are living from the charged nuclei.

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Answer:

The sequence order should be DNA to RNA to Proteins.

Explanation:

For you to get the RNA sequence, you need to find a match for the DNA sequence. Your RNA sequence should only have either AUCG for your 4 nucleotide bases. Once you have the RNA sequence found by pairing it with the DNA sequence, you would then to do use an RNA codon chart to find the amino acids. These amino acids are basically your proteins.

DNA to RNA to Proteins

Answer: It is usually separated from tea leaves by filtration. B Because the composition of the solution is uniform throughout, it is a homogeneous mixture. A Orange juice contains particles of solid (pulp) as well as liquid; it is not chemically pure.

The plant’s production of carbohydrates stops producing high-energy sugars altogether.

When carbon dioxide is completely removed from a plant's environment it is expected that the plant will stop producing energy-rich sugars altogether.CO2 is required for plants to photosynthesize. So without CO2, plants have no way to make energy. In this scenario, it will probably wither.

Carbon dioxide is an important greenhouse gas and helps trap heat in the atmosphere. Without them, our planet would be uninhabitable and cold. Plant photosynthesis produces oxygen and carbohydrates in a strict ratio, so we run out of oxygen as soon as we eat. But lethal levels of carbon dioxide will be reached long before these things happen.

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False. In a Friedel-Crafts acylation, the benzene ring does not function as a nucleophile. Instead, an acylium ion acts as an electrophile and reacts with the benzene ring to form an intermediate carbocation, which is then deprotonated to generate the product (a ketone).

In a Friedel-Crafts acylation reaction, the electrophilic substitution occurs on the benzene ring. The acylation is initiated by the addition of a Lewis acid catalyst, such as aluminum chloride (AlCl3), which helps generate the electrophilic species. The acyl group (R-C=O+) is generated from an acid chloride or an acid anhydride. The benzene ring, acting as a nucleophile, does not attack the acyl group directly. Instead, the acyl group is activated by the Lewis acid catalyst, forming an acylium ion. The acylium ion then reacts with the benzene ring, leading to the formation of an intermediate sigma complex. This intermediate is subsequently deprotonated, resulting in the formation of the product, which is a ketone.

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Answer:

D) Blender..................

Answer:

A. 7

(assuming the water is neutral)

Explanation:

Structure of Carbon dioxide is in the attachment.

Here,

Hybridization of Carbon is sp

Bond angle 180°

Structure = linear

Answer:

O=C=O

Explanation:

this is all you need

An instant cold pack takes advantage of an endothermic dissolution process.

Instant cold packs typically consist of two compartments containing separate substances, usually water and ammonium nitrate or urea. When the pack is activated by breaking a barrier between the compartments, the substances mix, leading to dissolution. The dissolution of ammonium nitrate or urea in water is an endothermic process, meaning it absorbs heat from the surroundings, resulting in a decrease in temperature. This temperature decrease causes the pack to become cold, providing a cooling effect. By utilizing an endothermic dissolution process, the instant cold pack can rapidly lower the temperature for therapeutic or comfort purposes.

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Answer:

Physical reaction

Explanation:

Since there are no other chemicals in the equation, but the state of the chemical is going from a liquid to a gas, you can conclude that this is a physical reaction.

Yes, NaOH, is a strong base.

NaOH, also known as sodium hydroxide

In aqueous solutions, it fully dissociates to form hydroxide ions (OH-). Strong bases have a high degree of dissociation, meaning they break apart completely in water to form their respective ions.

In contrast, weak bases only partially dissociate in water. Strong bases have a pH greater than 7, and NaOH has a pH of around 13.

Strong bases are also highly alkaline and can cause chemical burns if handled improperly. They are commonly used in industrial applications such as soap making, paper production, and oil refining.

A strong base is a substance that ionizes completely or almost completely in an aqueous solution. It releases hydroxide ions (OH-), which increases the hydroxide ion concentration and raises the pH of the solution. Strong bases have a high degree of dissociation, meaning they break apart completely in water to form their respective ions.

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Answer:

Explanation:

electrons have a minus charge. There are more of them than protons.

8 - 11 = -3 is the charge of the ion. (at atom that has a charge is an ion).

The statement of fact is that Gregor Mendel demonstrated that traits are passed from parents to offspring independently of one another under all circumstances that he tested.

The independent assortment of genes is the theory that states that traits are inherited from parents by offspring independent of each other.

Gregor Mendel from experiments using pea plants was able to demonstrate this observation by many scientists.

Since, scientific theories are proven by experiments, Mendel's experiments provided facts for this observation.

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The change of entropy for one mole of an ideal gas expanding reversibly and isothermally until its volume is doubled is equal to the gas constant (R) multiplied by the natural logarithm of 2.

]The change of entropy (ΔS) for one mole of an ideal gas that expands reversibly and isothermally at temperature T, with its volume doubling, is given by the formula: ΔS = nR ln(V2/V1). In this case, n = 1 mole, V2 = 2V1, and T remains constant.

To calculate the change of entropy for this specific process, we will use the given conditions and the formula mentioned above. As the process is isothermal, the temperature (T) remains constant throughout the process. Moreover, the process is reversible, which means that the gas is in equilibrium with its surroundings at every point of expansion. The volume of the gas doubles, so the final volume (V2) is twice the initial volume (V1).

Using the formula ΔS = nR ln(V2/V1), we can substitute the given values:
ΔS = (1 mole) * R * ln(2V1/V1).

Since V2 = 2V1, the formula simplifies to:
ΔS = R * ln(2).

Thus, the change of entropy for one mole of an ideal gas expanding reversibly and isothermally until its volume is doubled is equal to the gas constant (R) multiplied by the natural logarithm of 2.

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Answer:

the surface area of a solid reactant.

temperature.  

presence/absence of a catalyst.

The solubility of the salt in grams per 100 grams of water at 25°C is 38 g/100g. This means that at the given temperature, 38 grams of the salt can dissolve in 100 grams of water.

To determine the solubility of the salt in grams per 100 grams (g/100g) of water, we need to calculate the mass of the salt dissolved in 100 grams of water at 25°C. Given:

Mass of water (H2O) = 20g

Mass of salt dissolved = 7.6g

To find the solubility, we divide the mass of the dissolved salt by the mass of water and multiply by 100:

Solubility = (Mass of salt dissolved / Mass of water) * 100

Plugging in the values:

Solubility = (7.6g / 20g) * 100

Solubility = 38 g/100g

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Answer:

Extraction of aluminium

Aluminium ore is called bauxite . The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis. ... positively charged aluminium ions gain electrons from the cathode, and form molten aluminium.

Molecules are compounds that make covalent bonds between atom. In a covalent bond, the electrons from each atom invoved are shared between them, sticking the atoms together.

In ionic compounds, the electrons of each atoms are not shared, they are part of either of the ions. The ions sticke together because they are charged with opposite charges, so they attract each other.

So, ionic compounds are not considered individual molecules because they don't make covalent bonds, that is, their atoms don't shared electrons, they attract each other because of their opposite charges.

The correct option is C.

Justification:

Statement-1: This statement that vapour density remains constant during the course of reaction 2A(g) + 3B(g) → 4C(g) + D(g) is true. During a chemical reaction, the total number of moles of gases remains the same. Though the composition changes as reactants form products, the density does not change.

Statement-2: This statement that in all gaseous chemical reactions, vapour density remains constant is false. Not all gaseous reactions have constant vapour density. It depends on the number of moles of gases involved before and after the reaction. If the total number of moles remains the same, density will remain constant but not otherwise.

So, Statement-1 (about the given reaction) is true but Statement-2 (general statement) is false.

Hence, the correct option is C.

Statement-1 is True,

Statement-2 is False.

Does this help explain the justification? Let me know if any part is still not clear.

Answer:

56.7g

Explanation:

Density = mass/volume

According to this question, some lead (Pb) of certain weights was obtained on a fishing trip. The density of lead is given as 11.34g/mL. If the 50 weights are placed in a 250. mL box, the mass of the lead are as follows:

Density = mass ÷ volume

11.34g/mL = mass/250mL

mass = 250 × 11.34

mass = 2835g

Since the 50 weight of lead weighs 2835g, then the mass of each weight is calculated as follows:

= 2835/50

= 56.7g

Answer:

Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴.

Answer:

there you go man

Explanation:

Answer: the answer would be CaCI2

Explanation: this was one of my exam questions i got right. :)

Answer:

When you're eyes or body has been exposed to chemicals. For 15 minutes straight

Explanation:

The maximum volume of treated wastewater that should be put in the bottle is approximately 1210 ml. The remaining volume can be filled with water

To calculate the maximum volume of treated wastewater that should be put in the bottle to achieve a dissolved oxygen (DO) concentration of at least 2.0 mg/l at the end of the test, we need to consider the BOD removal efficiency and the initial DO concentration.

a) Calculation for maximum volume of treated wastewater:

Calculate the remaining BOD after treatment:

= 200 mg/l × (1 - 0.90)

= 20 mg/l

Calculate the theoretical oxygen demand (ThOD):

= 1.67 × 20 mg/l

= 33.4 mg/l

Calculate the oxygen required (OR):

= 33.4 mg/l - 9.2 mg/l

= 24.2 mg/l

Calculate the maximum volume of treated wastewater:

= 24.2 mg/l / (20 mg/l × 0.001)

= 1210 ml

Therefore, the maximum volume of treated wastewater that should be put in the bottle is approximately 1210 ml. The remaining volume can be filled with water.

b) If the mixture is half water and half treated wastewater, the initial DO concentration in the bottle would be:

Initial DO concentration = (0.5 × 9.2 mg/l) + (0.5 × 9.2 mg/l)

= 9.2 mg/l

After five days of the BOD test, assuming a similar BOD removal efficiency of 90%, the remaining BOD would be 20 mg/l (as calculated above).

The DO concentration at the end of the test can be estimated using the BOD5 to DO ratio, which is typically around 1.5:1. This means that for every 1 mg/l of BOD5 removed, approximately 1.5 mg/l of DO is consumed.

Calculating the decrease in DO due to the remaining BOD:

DO decrease = BOD5 removed × (BOD5 to DO ratio)

= (200 mg/l - 20 mg/l) × 1.5

= 180 mg/l × 1.5

= 270 mg/l

Final DO concentration = Initial DO concentration - DO decrease

= 9.2 mg/l - 270 mg/l

= -260.8 mg/l

Please note that a negative DO concentration is not physically meaningful in this context. It suggests that the oxygen demand from the remaining BOD5 exceeds the initial DO concentration. In practice, the DO concentration would reach 0 mg/l or close to it.

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Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na + and hydroxide anions OH −