please help it’s due today

Answer:

Explanation:

Given data:

Mass of alcohol = 400 g

Specific heat capacity of alcohol = 2.43 J/g°C

Initial temperature of alcohol = 16°C

Mass of water = 400 g

Specific heat capacity of water = 4.19 J/g°C

Initial temperature of water = 85°C

Final temperature of mixture = ?

Solution:

Equation:

m₁c₁ (T₂-T₁ ) = m₂c₂(T₂-T₁)

by putting values,

400 × 4.19  × (T₂ -  85°C) = 400 × 2.43  × (T₂ - 16°C)

1676  × (T₂ -  85°C) = 972 × (T₂ - 16°C)

To find the theoretical oxygen demand for the given solutions, we need to calculate the amount of oxygen required to completely oxidize the organic compounds present in each solution.

This can be determined by using the stoichiometry of the balanced chemical reactions representing the oxidation of the organic compounds.

a. Octanol (CH3(CH2)7OH)

The balanced chemical equation for the oxidation of octanol is as follows:

2C8H18 + 25O2 -> 16CO2 + 18H2O

From the balanced equation, we can see that for every 2 moles of octanol (C8H18), 25 moles of oxygen (O2) are required.

Given that the concentration of octanol is 200 mg/L, we can convert it to moles per liter:

200 mg/L * (1 g / 1000 mg) * (1 mol / molar mass of octanol)

Next, we can calculate the theoretical oxygen demand:

Oxygen demand = (moles of octanol) * (25 moles of oxygen / 2 moles of octanol)

b. Acetone (C3H6O)

The balanced chemical equation for the oxidation of acetone is as follows:

C3H6O + 4O2 -> 3CO2 + 3H2O

From the balanced equation, we can see that for every 1 mole of acetone (C3H6O), 4 moles of oxygen (O2) are required.

Given that the concentration of acetone is 90 mg/L, we can convert it to moles per liter:

90 mg/L * (1 g / 1000 mg) * (1 mol / molar mass of acetone)

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Answer:

The percentage of mass of hydrogen in aspirin is 4.48%

The percentage of mass of carbon in aspirin is 60%

The percentage of mass of oxygen in aspirin is 35.5%

Explanation:

Given that,

Mass of sample of aspirin = 134.50 g

Mass of hydrogen = 6.03 g

Mass of carbon = 80.70 g

Mass of oxygen = 47.77 g

We need to calculate the percentage of mass of hydrogen in aspirin

Using formula for percentage of mass

\(\text{percentage of mass of hydrogen}=\dfrac{m_{h}}{m_{s}}\times100\)

Put the value into the formula

\(\text{percentage of mass of hydrogen}=\dfrac{6.03}{134.50}\times100\)

\(\text{percentage of mass of hydrogen}=4.48\%\)

We need to calculate the percentage of mass of carbon in aspirin

Using formula for percentage of mass

\(\text{percentage of mass of carbon}=\dfrac{m_{c}}{m_{s}}\times100\)

Put the value into the formula

\(\text{percentage of mass of carbon}=\dfrac{80.70}{134.50}\times100\)

\(\text{percentage of mass of carbon}=60\%\)

We need to calculate the percentage of mass of oxygen in aspirin

Using formula for percentage of mass

\(\text{percentage of mass of oxygen}=\dfrac{m_{o}}{m_{s}}\times100\)

Put the value into the formula

\(\text{percentage of mass of oxygen}=\dfrac{47.77}{134.50}\times100\)

\(\text{percentage of mass of oxygen}=35.5\%\)

Hence, The percentage of mass of hydrogen in aspirin is 4.48%

The percentage of mass of carbon in aspirin is 60%

The percentage of mass of oxygen in aspirin is 35.5%

Answer:

25.7 g

Explanation:

I don't know what to put here hahaha, I hope my answer helps you ^^

Answer:

D

Excess solar radiation due to a missing magnetic field.

Explanation: Solar proton events (SPEs) are bursts of energetic protons accelerated by the Sun. They occur relatively rarely and can produce extremely high radiation levels. Without thick shielding, SPEs are sufficiently strong to cause acute radiation poisoning and death.

Hope this hels

plz mark brainliest

Answer:

Speed of jays increases first, again increases, decreases and then increases.

Explanation:

The speed of jays increases while moving from rest to point A and no acceleration due to constant speed. From point A to point B, the speed is continues to increase and no acceleration. From point B to point C, the speed of jays decreases and acceleration is produced in the journey due to change of speed and from point C to point D, the speed of jays again increases and acceleration is produced due to increasing the speed.

Answer:

The speed of jay's walk increases first, again increases, then it decreases and then increases due to his acceleration walk during parts A-D.

Explanation:

Answer:

The things that are changing in an experiment are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types.

Answer: The correct option is C ( is very hard and burns cleanly).

Explanation:

COAL is a form of rock that is made up of mostly carbon amongst other elements which includes sulphur, nitrogen, hydrogen and oxygen. There are different types of coal which include:

--> anthracite ( 90% carbon)

--> bituminous coal ( 70-90% carbon)

--> lignite ( 60- 70% carbon) and

--> peat (60 % carbon).

Anthracite is the type of coal that contains the highest carbon content ( 90% carbon). This makes it very hard and is often a times referred to as HARD COAL. Anthracite is a higher quality coal for domestic and open fire heating. This is because it contains less impurities than other type of coal and thereby making it to BURN CLEANLY avoiding atmospheric pollution.

Amyloid is a type of protein aggregate that forms when proteins misfold and aggregate into β-sheet-rich fibrils that can accumulate in tissues and cause disease.

There is increasing evidence that small molecules with aromatic substituents can inhibit amyloid formation by binding to and stabilizing the native, folded state of proteins.

One potential mechanism for this effect is that the aromatic substituents of the small molecules can interact with the aromatic side chains of the amino acid residues in the protein. This interaction can stabilize the native state of the protein by reducing the energy difference between the native and unfolded states, and prevent the protein from misfolding and aggregating into amyloid fibrils.

Moreover, the presence of aromatic substituents can also interfere with the formation of β-sheet structures, which are a hallmark of amyloid fibrils. By disrupting the formation of β-sheets, the aromatic molecules can prevent the growth of amyloid fibrils and promote the formation of less harmful oligomers or amorphous aggregates.

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Answer: Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons.

Explanation:

there an A B C D thing?

Explanation:

890

Answer: thrusters

Explanation: got it right

Answer:

All except 2nd one

Explanation:

Answer:

CB. Two different compounds mixing and remaining separate is not correct!

Answer:

3. The mass of ethanol required is approximately 0.522869 g

The mass of ethanoic acid required is approximately 0.68156 g

4. The mass of iron (III) oxide required is approximately 285.952.189.095 tonnes

5. The mass of silver nitrate required is approximately 14.53 grams

6. The mass of copper oxide that would be needed is approximately 31.86 grams

7. a. The mass of the precipitate, Zn(OH)₂ formed is approximately 49.712 grams

b. The mass of the precipitate, Al(OH)₃ formed is approximately 13 grams

c. The mass of the precipitate, Mg(OH)₂, formed is approximately 14.579925 grams

Explanation:

3. The 1 mole of ethanol and 1 mole of ethanoic acid combines to form 1 mole of ethyl ethanoate

The number of moles of ethyl ethanoate in 1 gram of ethyl ethanoate, n = 1 g/(88.11 g/mol) = 1/88.11 moles

∴ The number of moles of ethanol = 1/88.11 moles

The number of moles of ethanoic acid = 1/88.11 moles

The mass of ethanol = (46.07 g/mol) × 1/88.11 moles = 0.522869 g

The mass of ethanoic acid in the reaction = 60.052 g/mol × 1/88.11 moles ≈ 0.68156 g

4. 1 mole of iron(III) oxide reacts with 1 mole of CO₂ to produce 1 mole of iron

The number of moles in 100 tonnes of iron= 100000000/55.845 = 1790670.60614 moles

The mass of iron (III) oxide required = 159.69 × 1790670.60614 = 285952189.095 g ≈ 285.952.189.095 tonnes

5. The number of moles of NaCl in 5 grams of NaCl = 5 g/58.44 g/mol = 0.0855578371 moles

The mass of silver nitrate required, m = 169.87 g/mol × 0.0855578371 moles ≈ 14.53 grams

6. The number of moles of CuSO₄·5H₂O in 100 g of CuSO₄·5H₂O = 100 g/(249.69 g/mol) ≈ 0.4005 moles

The mass of copper oxide required, m = 79.545 g/mol × 0.4005 moles ≈ 31.86 grams

7. a. The number of moles of NaOH in the reaction = 20 g/(39.997 g/mol) ≈ 0.5 moles

2 moles of NaOH produces 1 mole of Zn(OH)₂

0.5 moles of NaOH will produce 0.5 mole of Zn(OH)₂

The mass of 0.5 mole of Zn(OH)₂ = 0.5 mole × 99.424 g/mol = 49.712 grams

The mass of the precipitate, Zn(OH)₂ formed = 49.712 grams

b. 6 moles of NaOH produces 2 moles Al(OH)₃

20 g, or 0.5 mole of NaOH will produce (1/6) mole of Al(OH)₃

The mass of the precipitate, Al(OH)₃ formed, m = 78 g/mol×(1/6) moles = 13 grams

c. 2 moles of NaOH produces 1 mole of Mg(OH)₂, therefore;

20 g or 0.5 moles of NaOH formed (1/4) mole of Mg(OH)₂

The mass of the precipitate, Mg(OH)₂, formed, m = 58.3197 g/mol × (1/4) moles = 14.579925 grams

Answer:

Explanation:

i will show in details how 2 do the 1st Q n u can do the rest by following the way how it is done

3. given C^2H^5OH + CH^3CO^2H → CH^3CO^2C^2H^5 + H^2O

molar ratio of ethanol, ethanoic acid and ethyl ethanoate is 1 : 1 : 1

so mass = no. of moles * molecular mass

for same no. of moles, mass / molecular mass is the same

molecular mass of CH^3CO^2C^2H^5 = 12+1*3+12+16*2+12*2+5*1 = 88

molecular mass of C^2H^5OH = 12*2+1*5+16+1 = 46

molecular mass of CH^3CO^2H = 12+1*3+12+16*2+1 = 60

1 g of ethyl ethanoate = 1/88 mole

it requires 1/88*46 = 0.5227 g of ethanol; and

1/88*60 = 0.6818 g of ethanoic acid

to react together to form 1 g of ethyl ethanoate

The bond angle formed by an axial atom is 180 degrees and equatorial atom is 90 degrees.

Above and below the core atom are the axial atoms. These are the "pyramid points" that the molecule forms. (NOTE: Bipyramidal refers to two pyramids. The pyramids should be visible in relation to the top and bottom halves of the centre atom if you look at an image. The atoms that are located in the horizontal plane of the Centre atom are known as equatorial atoms. (Consider how close to the Earth the equator is.)

Assuming that the EX5 is made up entirely of atoms, let's continue our debate (and not lone pairs). The equatorial atoms have 120 degree binding angles with one another. The axial and equatorial atoms' bond angles are 90 degrees.

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The bond order for this molecular electron configuration is 0.

(1)2(1*)2(2)2(2*)2(2p)4:

In this electron configuration, we have 2 electrons in the bonding molecular orbital (1) and 2 electrons in the antibonding molecular orbital (1*). Similarly, we have 2 electrons in the bonding molecular orbital (2) and 2 electrons in the antibonding molecular orbital (2*). Additionally, there are 4 electrons in the 2p atomic orbital.

To calculate the bond order, we subtract the number of antibonding electrons from the number of bonding electrons and divide the result by 2:

Bond order = [(number of bonding electrons) - (number of antibonding electrons)] / 2

Bond order = [(2 + 2) - (2 + 2)] / 2 = 0

Therefore, the bond order for this molecular electron configuration is 0.

(1)2(1*)2(2)2:

In this electron configuration, we have 2 electrons in the bonding molecular orbital (1) and 2 electrons in the antibonding molecular orbital (1*). We also have 2 electrons in the bonding molecular orbital (2) and no electrons in the antibonding molecular orbital (2*).

Calculating the bond order:

Bond order = [(number of bonding electrons) - (number of antibonding electrons)] / 2

Bond order = [(2 + 2) - 0] / 2 = 4 / 2 = 2

Therefore, the bond order for this molecular electron configuration is 2.

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Mole ratio is the proportional amount of moles of two or more compounds in a chemical reaction, and this concept is widely used in Stoichiometry, since in this type of matter we have to be comparing initial amount of reactant and final amount of product, usually, we have to convert grams of mass into moles of the compound, and when we have to compare the number of moles of different compounds, we use mole ratio, as we can see in the example below:

A + 2 B -> X

The mole ratio between A and B is 1:2, therefore if we have 3 moles of A in the reaction, we would have 6 moles of B, and with that concept in mind, we can find the mass asked in any question.

In this process, we can have the theoretical yield of a reaction, which is how much of the product is produced from the initial amount of reactant

We have two oversimplified reactions that take in account mole ratio:

1. Formation of Ammonia:

N2 + 3 H2 -> 2 NH3, here we have the following mole ratios:

1 N2 = 3 H2

1 N2 = 2 NH3

3 H2 = 2 NH3

2. Burning of Octane, which is fuel:

2 C8H18 + 25 O2 -> 16 CO2 + 18 H2O

The mole ratios are:

2 C8H18 = 25 O2

2 C8H18 = 16 CO2

2 C8H18 = 18 H2O

25 O2 = 16 CO2

25 O2 = 18 H2O

16 CO2 = 18 H2O

Limiting and excess reactants are, as the name already implies, the reactant the will limit the amount of the other reactant undergoing the reaction, and this is found through mole ratio. The excess reactant is the reactant that will not totally react, but it will have some of it left without undergoing the reaction

Answer:

They will determine the mass of various common elements and compounds and convert this data into values of moles, atoms and molecules.

Explanation:

The end products of photosynthesis are oxygen and carbohydrate.

The overall balanced eqation for photosynthesis reaction:

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

CO₂ is carbon dioxide or carbon(IV) oxide

H₂O is water molecule

C₆H₁₂O₆ is carbohydrate

O₂ is oxygen molecule

Light energy is transformed into a chemical energy, that is stored in a carbohydrate molecules (glucose), which are synthesized from carbon dioxide and water.

Plants (not animals) convert a solar energy into the chemical energy of sugars (food).

The pigment chlorophyll absorbs one photon and loses one electron (it passed throw an electron transport chain) in the light-dependent reactions.

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\(AlP_2O_6\)  is the empirical formula for the substance.

The simplest whole number ratio of atoms from each component element is the empirical formula for a compound. Find the moles of each element present in the compound so that we may derive the empirical formula. To do this, we need to convert the percentages of each element to the amount in moles.

First, convert the percentages of each element to grams. Since the percentages add up to 100%, we can use 100 grams as the total mass of the compound:

Aluminum: 15.9% × 100 g = 15.9 g

Phosphorus: 27.4% × 100 g = 27.4 g

Oxygen: 56.6% × 100 g = 56.6 g

Next, convert the mass of each element to moles by dividing by the molar mass of each element:

Aluminum: \(\frac{15.9 g }{ 26.98 g/mol }= 0.59 mol\)

Phosphorus: \(\frac{27.4 g }{30.97 g/mol} = 0.89 mol\)

Oxygen: \(\frac{56.6 g }{ 16.00 g/mol} = 3.53 mol\)

Now, divide each mole value by the smallest value (0.59 mol):

Aluminum :  \(\frac{ 0.59 mol }{0.59 mol} = 1\)

Phosphorus: \(\frac{0.89 mol }{ 0.59 mol }= 1.5\)

Oxygen :  \(\frac{ 3.53 mol}{ 0.59 mol} = 5.97\)

To get the simplest whole number ratio, we need to round each ratio to the nearest whole number.

Hence, the compound's empirical formula is \(AlP_2O_6\).

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198 ml To create 4% NaOH, you will need 7.92 grammes of sodium hydroxide, or (4 x 198)/100. So, 7.92 grammes of sodium hydroxide are dissolved in 198 ml of water.

The molarity of a solution is decreased by dilution. An aqueous solution's volume grows with the addition of more water, while the solute's moles remain constant. As a result, the solution's concentration and molarity are reduced.

Dilution happens as the solution's volume increases. As just a result, conductivity decreases and ions per millilitre increase. The molar conductivity is calculated using one mole of ions. The molar conductivity of the solution rises as a result of increased ion separation and mobility.

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Answer:

B.) Na₂SO₄

Explanation:

Covalent bonds are bonds which involve electrons being shared between two atoms. These bonds only occur between nonmetals.

Ionic bonds are bonds which involve electrons being given or taken by two atoms. These bonds form between a metal and a nonmetal.

NH₃ contains nitrogen and hydrogen, two nonmetals. Therefore, this molecule only contains covalent bonds.

Na₂SO₄ has both covalent and ionic bonds. The covalent bonds are found within the polyatomic ion, SO₄²⁻. Sulfur and oxygen are both nonmetals, thus covalently combining. The ionic bond forms between the  Na⁺ and SO₄²⁻. Sodium (Na) is a metal which wishes to give up electrons to have a complete octet. SO₄²⁻ serves as the anion which it bonds with.

CH₃COOH contains hydrogen, carbon, and oxygen. All of these are nonmetals, thus the only bonds formed are covalent.

NaCl contains sodium, a metal, and chlorine, a nonmetal. Therefore, this compound is held together by an ionic bond.

Answer:

!dk if this answers your question.

Explanation:

Astronomers have spent a lot of time measuring the rotation rates of galaxies. The rates do not fall off with distance as they would if visible matter was all there was. So, unlike the solar system, where the rate falls with distance, in galaxies the rate at the edge is too high to hold together, unless there is more mass than can be seen. This was the first indication of what is now termed 'dark matter'. It exists as huge blobs of mass that envelope galaxies. What it is made of, no one knows yet.

Answer:

1,3-bisphosphoglycerate

Explanation:

Answer:yup!!

Explanation:

Answer:

Endothermic reaction.

Explanation:

The reactants are at a lower energy rate than the products. Because delta H is positive, energy is absorbed from the surroundings.

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Electrons and proton are a type of subatomic particle with a negative and positive charge. Protons are held together in the atom's nucleus by the nuclear force. A subatomic particle without charge is the neutron.

The electron, the smallest constituent part of an atom, has a negative charge. Protons and electrons are present in an atom in a neutral state in an equal number. One electron and one proton are all that the hydrogen ion has. On the other hand, the atomic nucleus possesses 92 protons, that means 92 electrons.

Electrons are present outside of the atom's nucleus, in contrast to neutrons and protons that are contained inside the nucleus at its center. Negative electrons are drawn to the positively charged nucleus so because electric charges of opposite sign attract one another.

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On Kilimanjaro's summit, atmospheric pressure can be as low as 0.20 atm. A tank of oxygen has a 10.0 L capacity. At this pressure, the gas inside would have a volume of 1.2 103 L.

Boyle's law states that a gas's pressure is inversely related to its volume in a container.

Additionally, if the temperature is constant, it may be said that the ratio of a gas's pressure to its volume is constant.

P1V1 = P2V2

Here, P1 denotes the air pressure at the top of Mount Kilimanjaro, V1 the capacity of the oxygen tank, P2 the required fill pressure, and V2 the volume of the gas.

P2 = 0.200 x 10/1200 x 0.002 atm P2 = 0.20 atm (10 L) = P2 (1.2 x 103 L)

Therefore, the pressure at which the tank must be filled is 0.002 atm

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