Q21 90g of glucose is dissolved in water. The glucose solution is fermented. C6H12O62CO₂ + 2C₂H₂OH glucose, M, = 180 After the fermentation finishes, 6.8g of ethanol is obtained from the solution. What is the percentage yield of ethanol? A 7.4 B 7.6 C 14.8 ethanol, M, = 46 D 29.6​

Answer:

Explanation:

All it takes is a momentary lapse in concentration. When you are in the laboratory and take a direct sniff of the chemicals you are using, you run the risk of damaging your mucous membranes or your lungs.

Answer:

1. 8.28

Explanation:

I'm not sure but I hope it's help

(d) 23894Pu is the radioisotope that is found naturally. It is a naturally occurring element that is present in uranium ores in very small concentrations.

Except 23894Pu, which is found naturally, the remaining isotopes on the list, in contrast, are typically created in nuclear reactors or particle accelerators and are not naturally occurring.

A. synthetic isotope created by nuclear processes is 24296Cm.

B. The radioactive hydrogen isotope 31H is a synthetic isotope.

C. The isotope 258103Lr is artificial, has a very brief half-life, and is not naturally occurring on Earth.

The term "radioisotope" refers to an unstable isotope of an element that undergoes radioactive decay. Isotopes are atoms of the same element with variable numbers of neutrons but the same number of protons in their nucleus. Nuclear reactions can be used to create radioisotopes intentionally or naturally in the environment. They are used in a wide variety of scientific, medical, industrial, and agricultural fields.

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Answer:

Nothing

Explanation:

Thermal energy and heat are mainly related because of the fact that the faster molecules move, the more heat is created. If molecules are vibrating slower, that means that there will be less energy, resulting in less heat. Say I am boiling water. As the temperature increases, the water molecules move faster. Once that water cools, the molecules will be moving really slowly. In conclusion, thermal energy and heat are related because of how fast or slow the molecules move, the more or less heat and energy will be produced. I hoped this helped!

Answer:

html

Explanation:

im in web tech

Answer:

Because noble gases have a full octet, their ionization energies are actually quite high. Electron affinity is the amount of energy released when an electron is added to a neutral atom. Because noble gases have stable electron configurations, they have very low electron affinities.

Explanation:

Answer:

Noble gases have a stable outer shell

Explanation:

Answer: I'm willing to help you find the formula for that ionic crystal but, I can't see anything.

The ionic crystal contains a total of 6 Ba atoms and 6 oxygen atoms. Hence they are in 1 : 1 ratio and the formula of the ionic compound is BaO.

Ionic compounds are formed between metals and non-metals. Ionic bond is formed by the lose of electrons from the metals to the nonmetals. The chemical formula of the ionic compounds are written with the cationic symbol first.

The given ionic crystal is formed with barium and oxygen atoms. Valency of barium is 2 and that of oxygen is also 2. Thus, barium loses two electrons to oxygen forming BaO.

The given crystal lattice consists of 3 barium atoms and 3 oxygen atoms in front face and 3 Ba and 3 o in back face also. Thus, both are 6. They are in the ratio of 1 : 1. Hence, the compound is named as BaO.

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In the lower latitudes where thermocline will exists, as we drop down from surface through ocean water, water density will increase while water temperature will generally decrease.

A thermocline refers to a layer in the ocean where there is a rapid change in temperature with depth. In lower latitudes, especially in tropical regions, there is a pronounced thermocline due to the heating of surface waters by sunlight and the subsequent stratification of water layers.

As we descend through the ocean water from the surface, the water density tends to increase. This is because colder water will be denser than warmer water. In the surface layer, which is exposed to sunlight and warmer air temperatures, the water is generally warmer and less dense. However, as we move deeper into the thermocline, the water becomes colder and denser due to factors like mixing, upwelling, or the influence of cooler currents.

Conversely, the water temperature will generally decrease as we go deeper into the thermocline. The warmest water is found near the surface, where it is exposed to solar radiation and warmer air temperatures.

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--The given question is incomplete, the complete question is

"In lower latitudes where a thermocline exists, as we drop down from the surface through ocean water, water density will ___________while water temperature will respond inversely."--

2.5 X 10²⁴ atoms of copper is equivalent to 266.7g of Cu.

HOW TO CALCULATE MASS:

Therefore, 2.5 X 10²⁴ atoms of copper is equivalent to 266.7g of Cu.

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The maximum amount of gas product (HCl) that can be formed at STP is 573.44 L.

Hydrogen gas (H₂) at STP occupies a volume of 22.4 L per mole. So, 286 L of hydrogen gas at STP is 286/22.4 = 12.8 moles of hydrogen gas. The balanced chemical equation for the reaction of hydrogen gas and chlorine gas (Cl₂) is:

H₂ + Cl₂ → 2HCl
1 mole of H₂ reacts with 1 mole of Cl₂ to form 2 moles of HCl.
12.8 moles of H₂ would require 12.8 moles of Cl₂ for complete reaction.
However, the question states that there is excess chlorine gas, so the hydrogen gas would be the limiting reactant.
Hence, the maximum amount of gas product that can be formed is 2 x 12.8 = 25.6 moles of HCl.
At STP, 1 mole of any ideal gas occupies a volume of 22.4 L.
So, 25.6 moles of HCl would occupy a volume of 25.6 x 22.4 = 573.44 L.
Therefore, the maximum amount of gas product (HCl) that can be formed at STP is 573.44 L.

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The enthalpy for the reaction : ΔH = -132

Given

Reaction and the enthalpy

Required

the enthalpy

Solution

Hess Law

Reaction 1 reverse :

A + B = G + C  ΔH = -277

Reactions 2 and 3 remain the same (unchanged)

C + F = A         ΔH = 303

D = B + H         ΔH = -158

Add up all the reactions and remove the same compound from two different sides

D + F = G + H  ΔH = -132

1. (a) Class: carboxylic acid; IUPAC name: propanoic acid. (b) Class: alkyl halide; IUPAC name: chloro-1-propane. (c) Class: alkane; IUPAC name: 1-propanecarbonitrile. (d) Class: ester; IUPAC name: ethyl methanoate.

IUPAC stands for International Union of Pure and Applied Chemistry. It is an international scientific organization responsible for developing and promoting international standards in the fields of chemistry and chemical nomenclature. The IUPAC name of a chemical compound is an unambiguous, systematic method for naming compounds according to their chemical structure and physical properties.

(e) Class: ether; IUPAC name: dimethyl ether. (f) Class: acyl halide; IUPAC name: 1-chloro-2,2-difluoropropane-1-carbonyl chloride.

2. (a) Hexanoic acid: CH3CH2CH2CH2CH2COOH. (b) Butanal: CH3CH2CHO. (c) Pent-1-ene: CH2=CHCH2CH2CH3. (d) 1-bromo-2-methylbutane: CH3CH2CH(Br)CH3. (e) Ethyl methanoate: CH3COOCH2CH3. (f) Methoxypropane: CH3OCH2CH3. (g) But-2-yne: CH3C≡CHCH3.

3. Answer: B. CH3CONH2 is an amine because it contains an amine group (NH2).

4. Answer: A. 1-iodopropane is a member of the same homologous series as 1-bromopropane because they both have the same molecular formula (C3H7Br or C3H7I) and the same functional group (halogen).

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To calculate the theoretical yield of potassium alum, we need to determine the number of moles of aluminum present in the 1.16 g sample and then use the stoichiometry of the reaction to find the corresponding number of moles of potassium alum.

Therefore, the theoretical yield of potassium alum that could be obtained in the reaction is approximately 10.23 grams.

First, we calculate the number of moles of aluminum using its molar mass:

Number of moles of aluminum = Mass of aluminum / Molar mass of aluminum

= 1.16 g / 26.98 g/mol (molar mass of aluminum)

≈ 0.043 moles

Next, we use the balanced chemical equation for the reaction between aluminum and potassium alum to find the mole ratio between aluminum and potassium alum. The balanced equation is:

2 Al + K2SO4 · Al2(SO4)3 + K2SO4

From the balanced equation, we see that 2 moles of aluminum react to form 1 mole of potassium alum.

Therefore, the theoretical yield of potassium alum is:

Theoretical yield = Number of moles of aluminum * (1 mole of potassium alum / 2 moles of aluminum)

= 0.043 moles * (1 mole / 2 moles)

= 0.0215 moles

Finally, we convert the number of moles of potassium alum to grams using its molar mass:

Theoretical yield in grams = Theoretical yield in moles * Molar mass of potassium alum

= 0.0215 moles * 474.39 g/mol (molar mass of potassium alum)

≈ 10.23 g

Therefore, the theoretical yield of potassium alum that could be obtained in the reaction is approximately 10.23 grams.

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Answer:

My guess is A.

Explanation:

Answer:

75L of additional water to have a pH 1 solution

Explanation:

The reaction of HCl With NaOH is:

HCl + NaOH → H₂O + NaCl

By using molar mass of each reactant you can know how many moles will react, thus:

HCl: 364.6g HCl ₓ (1mol / 36.46g) = 10 moles HCl

NaOH: 80g NaOH ₓ (1mol / 40g) = 2 moles NaOH

That means after the reaction will remain in solution, 10-2 = 8 moles of HCl = 8 moles of H⁺ (In water, HCl dissociates as H⁺ and Cl⁻ ions).

A solution with pH = 1 contains:

pH = -log [H⁺]

1 = -log [H⁺]

0.1M = [H⁺]

As molarity, M is the ratio between moles and liters and you want a solution 0.1M having 8 moles of H⁺ you require:

0.1M = 8 moles H⁺ / 80L

As the student combines the solution with 5L of water, you require

Explanation

Structure Of The Atom Our current model of the atom can be broken down into three constituents parts protons, neutron, and electrons. Each of these parts has an associated charge, with protons carrying a positive charge electrons having a negative charge and neutrons possessing no net charge.

Answer:

the number of chlorine  molecules  in  6.5  moles  of  chlorine  is  calculated  as  follows

by  use  of Avogadro  constant  that  is  1mole =  6.02  x10^23    molecules

what  about  6.5  moles

6.5  x  (  6.02x 10^23)=  3.913  x10^24

Quadrilaterals are polygons with four sides, and studying their properties and classifications will help you identify and analyze various types of quadrilaterals effectively.

Understanding quadrilaterals is essential for geometry, and improving your grades in this area is achievable with guidance. A quadrilateral is a polygon with four sides. By studying the properties of quadrilaterals, you can identify and analyze different types of quadrilaterals. Key properties include angles, side lengths, and polygons . Some common types of quadrilaterals include squares, rectangles, parallelograms, trapezoids, and rhombuses. Each type has specific properties and characteristics that distinguish it from others. Learning these properties will help you classify and solve problems related to quadrilaterals. By practicing identifying and working with polygons , you can improve your understanding and performance in this topic. If you have specific questions or need further assistance, feel free to ask.

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The mass of aspirin produced when 150.0 g of salicylic acid reacts with an excess of acetic anhydride is 196.0 g.

When salicylic acid reacts with acetic anhydride, it forms aspirin and acetic acid. The balanced chemical equation for this reaction is:
C7H6O3 + (C2H3O)2O → C9H8O4 + CH3COOH
From this equation, we can see that one mole of salicylic acid reacts with one mole of acetic anhydride to produce one mole of aspirin and one mole of acetic acid. The molar mass of salicylic acid is 138.12 g/mol and the molar mass of aspirin is 180.16 g/mol.
To determine the mass of aspirin produced when 150.0 g of salicylic acid reacts with an excess of acetic anhydride, we first need to calculate the number of moles of salicylic acid present in the reaction:
n = m/M = 150.0 g / 138.12 g/mol = 1.086 mol
Since there is an excess of acetic anhydride present in the reaction, we know that all of the salicylic acid will react to form aspirin. Therefore, the number of moles of aspirin produced will also be 1.086 mol.
Finally, we can calculate the mass of aspirin produced by multiplying the number of moles by the molar mass:
m = n x M = 1.086 mol x 180.16 g/mol = 196.0 g
Therefore, the mass of aspirin produced when 150.0 g of salicylic acid reacts with an excess of acetic anhydride is 196.0 g.

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Answer:

The correct answer is - false.

Explanation:

At the energy-generating station, when the coal is burned, the chemical energy store in the coal converted into thermal energy and light or luminous energy.

The thermic energy generated used to heat and boil the water or liquid to generate the gas and generate the kinetic energy to move the fan that is desgined to generate the electrical energy.

Thus, the statment is false statement as it does not convert into sound energy.

The change in size is a physical property and and the heat evolution by burning is a chemical property. Hence,  option c is correct.

Physical properties of a substance involves, change in state, size or shape. They does not involve formation of a new compound and thus does nit undergo breaking or making of chemical bonds.

A chemical change involves the breaking or making of chemical bonds results in the formation of a new product. The change in size of a material by stretching it is a physical change.

Burning a material involves breaking of bonds and the formation of ash and other side products. Hence, option c is correct. C is a chemical property and D is a physical property.

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Answer:

Radon

Explanation:

:

Answer:

c. Radon (Rn)

Explanation:

hope this can help

There are 3 significant figures in 20600.

Mass of water driven off  = 0.15 g

Moles of anhydrate 0.00257 moles

Moles of water driven off = 0.00833 moles

Moles of water per mole of hydrate = 3 moles

Molecular formula of the Hydrate is X.3H₂O where X is the anhydrate salt.

Cu(NO₃)₂ + 2 KI ---> 2 KNO₃ + CuI₂

The ideal mole ratio is 1 : 2

The limiting reactant will be KI.

A hydrate salt is salt that contains water of crystallization.

The mass of water driven off = 0.5 - 0.35 g

Mass of water driven off  = 0.15 g

Moles of anhydrate = 0.35/136

Moles of anhydrate = 0.00257 moles

Moles of water driven off = 0.15/18

Moles of water driven off = 0.00833 moles

Moles of water per mole of hydrate = 0.00833/0.00257

Moles of water per mole of hydrate = 3 moles

Molecular formula of the Hydrate is X.3H₂O where X is the anhydrate salt.

The double replacement equation is given below:

Cu(NO₃)₂ + 2 KI ---> 2 KNO₃ + CuI₂

The ideal mole ratio for the reaction of Cu(NO₃)₂ and KI is 1 : 2

If 6 moles of Cu(NO₃)₂ was added to 2 moles of KI, the limiting reactant will be KI.

In conclusion, a hydrated salt is a salt that contains water of crystallization.

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A taiga is an ecosystem that is cold in the winter, cool in the summer, has little rainfall, and supports evergreen trees, moose, and weasels, this ecosystem most resembles the boreal forest ecosystem.

a. Frogs, lily pads, and fish are parts of a pond community.

True. Sentence 3.

b. An ecosystem includes only living things.

False. Sentence 4.

c. All the barn owls in a state park make up a population of owls.

True. Sentence 2.

d. Squirrels and mice are two different populations of animals.

True. Sentence 6.

e. A desert community is made up of cactus, sand, and camels.

False. Sentence 5.

f. A desert ecosystem can include cactus, sand, and camels.

True. Sentence 8.

2. The most likely meaning of interact in sentence 8 is option a. affect each other.

Sentence 9 gives the best evidence for this answer.

3. An example of an ecosystem is the Amazon Rainforest.

5 populations of organisms you would expect to find in it are:

4. A taiga is an ecosystem that is cold in the winter, cool in the summer, has little rainfall, and supports evergreen trees, moose, and weasels.

The taiga ecosystem most resembles the boreal forest ecosystem.

COMPARING ECOSYSTEMS

What is being compared is:

Desert vs Rainforest

Their similarities are:

Their differences are:

In conclusion, the desert and rainforest ecosystems differ significantly in terms of vegetation, climate, and water availability.

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1.

a. True. Sentence 1.

b. False. Sentence 2.

c. True. Sentence 3.

d. True. Sentence 4.

e. False. Sentence 5.

f. True. Sentence 6.

2. The most likely meaning of interact as it is used in sentence 8 is "affect each other." Sentence 7 provides the best evidence for this answer, stating that "the living and nonliving things in an ecosystem depend on each other."

3.  Rainforest is an ecosystem. Five populations of organisms that can be found in a rainforest include:

4.  A taiga ecosystem most resembles a tundra ecosystem.

5. The following diagram compares the populations in the desert and the rain forest ecosystems:

COMPARING ECOSYSTEMS

Reason for comparing: Know more about the populations

We are comparing Desert vs. Rain forest

How same?

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The volume of H2S needed to neutralize 45mL of NH2- is 0.053 L

A neutralization reaction, in which an acid and a base react to form water and salt.

The reaction between H2S and NH2- is a neutralization reaction. The balanced equation for the reaction is:

H2S(aq) + NH2-(aq) → NH4HS(aq)

We know that the concentration of H2S is 1.2 M and the concentration of NH2- is 0.80 M and we are trying to find the volume of H2S needed to neutralize 45mL of NH2-.

The number of moles of H2S can be calculated by using the formula:

moles = molarity x volume

The volume of H2S needed to neutralize 45mL of NH2- is equal to the number of moles of NH2- in 45mL, divided by the concentration of H2S.

moles of NH2- = 0.080 L * 0.80 mol/L = 0.064 mol

volume = moles of NH2- / molarity of H2S

volume = 0.064 mol / 1.2 mol/L = 0.053 L

Therefore, the volume of H2S needed to neutralize 45mL of NH2- is 0.053 L.

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A large negative value of ΔG, therefore, translates to a large value of Keq and a small difference in the relative amounts of starting materials vs products at equilibrium.

A large negative value of ΔG corresponds to a large value of Keq, indicating that the products are favored at equilibrium over the starting materials. In other words, a large negative ΔG implies that the reaction proceeds almost entirely in the forward direction, and there is very little starting material left at equilibrium.

Conversely, a small or positive value of ΔG corresponds to a small or negligible value of Keq, indicating that the starting materials are favored over the products at equilibrium. In other words, the magnitude and sign of ΔG determine the direction and extent of the reaction, and whether it is energetically favorable or unfavorable.

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Answer:

B) The molecules were closer together when the juice pop was frozen.