please help. urgent. needs explanation with it too :(

The total kilojoules in two tablespoons is  836.8 kJ.

To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.

The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.

For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:

100 kcal * 4.184 kJ/kcal = 418.4 kJ

So, if we have two tablespoons of this substance, the total energy would be:

418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ

It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.

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Explanation:

Hund's first and second rules describe how electrons are arranged in an atom's orbitals. Hund's first rule states that when electrons occupy orbitals of equal energy (such as the three p orbitals in a given shell), they will each first occupy separate orbitals before any orbital receives a second electron. This means that electrons will always try to maximize their spin, with one electron in each orbital having the same spin before any pairing occurs.

Hund's second rule states that if two or more orbitals of the same energy level are available, electrons will occupy empty orbitals before they pair up in an orbital that already has an electron.

Now, let's look at the orbital notation for sulfur. The atomic number of sulfur is 16, which means it has 16 electrons.

The orbital notation for sulfur would be:

1s² 2s² 2p⁶ 3s² 3p⁴

This indicates that sulfur has two electrons in the 1s orbital, two electrons in the 2s orbital, and six electrons in the 2p orbital, fully occupying all three 2p orbitals with two electrons in each and spinning in the same direction. Sulfur also has two electrons in the 3s orbital and four electrons in the 3p orbital, with a single electron in each of the three 3p orbitals and the fourth 3p orbital being half-filled. The half-filled 3p orbital is a consequence of Hund's rule, which predicts that electrons will fill each of the three 3p orbitals with one electron before any two orbitals receive a second electron.

Answer:

Answer choice B. It is a spiral Galaxy

The types of tissues that you think humans might have that are similar to plant’s vascular tissues - is connective tissues of circulatory tissues.

A plant's vascular tissues transport nutrients throughout the plant, just as the circulatory system transports nutrients throughout the human body.

Connective tissue in the human :

Thus, the types of tissues that you think humans might have that are similar to plant’s vascular tissues - is connective tissues of circulatory tissues.

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The theoretical yield of the reaction between 6.20 g of carbon with excess oxygen is 22.7 g. The actual yield is given 8.35 g. Thus, the percent  yield is 36.7 %.

Percent yield of a reaction is the ratio of its actual yield to the theoretical yield multiplied by 100. The theoretical yield is calculated from the balanced chemical equation of the reaction.

One mole or 12 g of C gives one mole of carbon dioxide. Molar mass of CO₂ is 44 g/mol. Thus, the mass of carbon dioxide that can be produced from 6.20 g of C is :

= (6.20 × 44 ) / 12 g = 22.73 g.

The actual yield of CO₂ is 8.35g only. Thus, its percent yield is calculated as :

percent yield = 8.35 g/ 22.73 g × 100 = 36.7 %.

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Answer:

19.4 g/cm^3

Explanation:

Answer:

It would go to a right angle which would 18 degrees .

Explanation:

Answer:

Use a ratio of 0.44 mol lactate to 1 mol of lactic acid  

Explanation:

John could prepare a lactate buffer.

He can use the Henderson-Hasselbalch equation to find the acid/base ratio for the buffer.

\(\text{pH} = \text{pK}_{\text{a}} + \log\dfrac{\text{[A$^{-}$]}}{\text{[HA]}}\\\\3.5 = 3.86 + \log\dfrac{\text{[A$^{-}$]}}{\text{[HA]}}\\\\\log\dfrac{\text{[A$^{-}$]}}{\text{[HA]}} = 3.5 - 3.86 = -0.36\\\\\dfrac{\text{[A$^{-}$]}}{\text{[HA]}} = 10^{-0.36} = \mathbf{0.44}\)

He should use a ratio of 0.44 mol lactate to 1 mol of lactic acid.

For example, he could mix equal volumes of 0.044 mol·L⁻¹ lactate and 0.1 mol·L⁻¹ lactic acid.

Answer:

3.50 Mol/L or M

Explanation:

450 mL / 1000 = 0.45 L

1 mole ------- 126.751 g

? mole ------- 200 g

moles = 200 * 1 / 126.751

moles = 200 / 126.751

= 1.57789 moles FeCl₂

M = n / V

M = 1.57789 / 0.45

= 3.50 Mol/L or M

An atom of element A has a mass of 2 units, while an atom of element B has a mass of 5 units, the ratio of element A to element B in a compound that had a mass of 11 units is 3:1

Atom are defined as smallest unit into which matter can be divided without the release of electrically charged particles.

It can also be defined as the building blocks of matter and were created after big bang theory.

Mass are defined as quantitative measure of inertia, fundamental property of all matter.

Elements are defined as a pure substance consisting of only one type of atom which all has the same numbers of protons in their nuclei.

As ratio of element A to element B is given then the ratio will be 3:1

Thus, an atom of element A has a mass of 2 units, while an atom of element B has a mass of 5 units, the ratio of element A to element B in a compound that had a mass of 11 units is 3:1

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Answer:

0.322 g

Explanation:

Since our concentration is given in mass per volume percent % (m/v)

% (m/v) = mass of solute in g/volume of solution in mL × 100%

Since % (m/v) = 0.92 and volume of the required solution is 35.0 mL, we find the mass of NaCl from

mass of NaCl = % (m/v)/100 % × volume of solution

= 0.92 % (m/v)/100 %× 35 mL

= 0.0092 × 35

= 0.322 g

The study of a chemical is called chemistry.

The correct answer is 0.322 g

The saline is said that the amount of salt present in the solution. The formula used to solve the question is as follows:-

\(\frac{m}{v} = \frac{mass \ of\ solute}{volume\ of\ solution} * 100\)

The data is given as follows:-

Mass of NaCl is as follows:-

 \(\frac{0.92}{100} * 35 mL\)

\(0.0092 * 35\\= 0.322 g\)

Hence, the correct answer is 0.322g.

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In a molecule or covalent bonding, elements having Octet electrons to obtain the stability with eight electrons.

One element that does not follow the octet rule is hydrogen. For stability only require stable electrons.

A molecule can present covalent bond but can be chemical.

Covalent bonding is a type of chemical bonding that occurs when two or more atoms share electrons in order to form a strong bond between them. This type of bond is formed when atoms share electrons in a way that gives each atom a full outer shell of electrons, known as the octet rule. This means that all atoms in the bond must have a total of eight electrons in their outermost shell. The atoms involved in a covalent bond form a molecule, which is held together by the shared electrons.

The octet rule is a guideline that states that atoms will bond in a way that allows them to have a full outer shell of electrons. This means that they must share electrons in order to reach a total of eight electrons in their outermost shell. The sharing of electrons creates a strong bond between the atoms that form a molecule. The sharing of electrons also results in the creation of a covalent bond.

However, not all elements follow the octet rule. For example, hydrogen only requires two electrons to reach a stable state, so it does not need to share electrons in order to reach the octet rule. Therefore, a hydrogen molecule will not have a covalent bond.

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To answer this question we have to find the value of ka, to do it, we can use the value of kb. The product of the kb of a base and the ka of its conjugated base is kw(1x10^-14):

Now, we have to use the equation of Hendersson and Hasselbach:

Answer:

mass in gram = 642.6 g

Explanation:

Given data:

Density of aluminum = 2.70 g/mL

Volume of aluminum = 238 mL

Mass in gram = ?

Solution:

Density:

Density is equal to the mass of substance divided by its volume.  The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

d =m/v

d = density

m=mass

V=volume

Now we will put the values in formula.

2.70 g/mL = m/ 238 mL

m = 2.70 g/mL × 238 mL

m = 642.6 g

Because there are two mutually connected nuclei in aromatic ring of phenacetin that are not related to other protons and whose shift differences are equal to coupling constant, ring displays AB pattern.

The ring protons in benzene experience deshielding because their chemical shift is 7.3 parts per million (ppm) as opposed to 5.6 for the vinylic proton in cyclohexene, and because the induced magnetic field outside the ring has the same direction as the external field.

Around 6–8 ppm of benzene contains protons. Due to the deshielding action of the aromatic ring, this is higher than the protons in other hydrocarbons like alkanes and alkenes.

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Answer:Due to the presence of two mutually connected nuclei and a shift difference equal to the coupling constant, the aromatic ring of phenacetin exhibits the AB pattern.

Explanation:

Answer:

2.41 × 10²⁰ atoms

Explanation:

Step 1: Given data

Step 2: Convert the mass of the sample to grams

We will use the relationship 1 g = 1,000 mg.

38.3 mg × (1 g/1,000 mg) = 0.0383 g

Step 3: Calculate the number of atoms in 0.0383 g of molybdenum

0.0383 g × (1 atom/1.59 × 10⁻²² g) =  2.41 × 10²⁰ atom

The atomic radius of the gold based on this structure in picometers ia given as:  21.7506

The atomic radius is: The average or normal distance from the nucleus's center to the edge of the surrounding electron shells is what we mean when we talk about an element's atomic radius.

We have the effective number of gold atoms to be 4 in a given unit cell

Then the molar mass of gold is given as 197 g / mol

The relationship between the edge length and the atomic radius is defined mathematically as:

√2a = 4r

make r the subject of the formula

r = √2a / 4

From the question the value of a is given as unit cell edge length of 61.52 pm

We would put this in the formula such that we would have:

r = √2 * 61.52 /4

r = 87.0024 /4

r = 21.7506

The atomic radius is  21.7506

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The Art Forger Who Tricked the Nazis:

Schrenker crashed his plane and made a fake call. He mail his friend. It is harder to create a fake ID now because of increased security features. With all of the security features, it is not an easy thing to master. To take a legitimate one.

Mr. Abagnale believes that all that is required to obtain a birth certificate is a child's death record from a courthouse. A birth certificate and some white-out on an apartment lease gets you a driver's license, which gets you a passport.

He despised what he was doing and became lonely. He was eventually imprisoned for everything.

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Answer:

Intermediate.

Explanation:

Hello,

In this case, we can rewrite the steps as:

\(A + B \rightarrow C\ \ (fast)\\\\C + B \rightarrow D + E\ \ (slow)\\\\E + B \rightarrow F \ \ (very fast)\)

Thus, we can notice that in the fast step, C is present as a product but after that is consumed in the slow step, for that reason, and by cause of its formation-consumption behavior, it is properly described as an intermediate as it is not neither a starting-up substance (reactant in the first step) nor a final substance (product in the final step).

Best regards.

A) Ethanol in water: Distillation.

B) Boiling the mixture of chloride crystals with water: Evaporation.

C) Pure water from muddy water: Filtration.

D) Sodium chloride in water: Evaporation or Crystallization.

E) Sodium carbonate in water: Filtration or Evaporation.

F) Chlorophyll from leaves: Extraction using a suitable solvent like ethanol.

G) Mixture of acetic acid and alcohol: Distillation.

H) Serum from blood sample: Centrifugation.

I) Kerosene from water: Separatory funnel or Decantation.

J) Ammonium chloride in sand: Sublimation or Dissolving in water and Filtration.

A) Ethanol in water: Distillation can be used to separate ethanol from water based on their different boiling points.

B) Boiling the mixture of chloride crystals with water: By heating the mixture, the water will evaporate, leaving behind the chloride crystals.

C) Pure water from muddy water: Filtration can be used to separate the solid particles (mud) from the water.

D) Sodium chloride in water: Evaporation can be used to separate sodium chloride from water by heating the mixture until the water evaporates, leaving behind the salt.

E) Sodium carbonate in water: Filtration can be used to separate solid sodium carbonate from water, similar to muddy water.

F) Chlorophyll from leaves: Extraction using a suitable solvent like ethanol or acetone can be used to separate chlorophyll from leaves.

G) Mixture of acetic acid and alcohol: Distillation can be used to separate the mixture based on their different boiling points.

H) Serum from blood sample: Centrifugation can be used to separate the serum, which is the liquid part of blood, from the solid components like cells.

I) Kerosene from water: Separatory funnel or decantation can be used to separate the immiscible liquids by pouring off the top layer (kerosene) from the bottom layer (water).

J) Ammonium chloride in sand: Sublimation can be used to separate ammonium chloride by heating the mixture, causing the ammonium chloride to vaporize and then condense back into solid form in a cooler region, leaving the sand behind.

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Problem 1:

we need 80 g of the 15% solution and 120 g of the 20% solution.

Let x be the mass of the 15% solution needed and y be the mass of the 20% solution needed.

x + y = 200 (total mass of the two solutions)

0.15x + 0.2y = 0.17(200) (total amount of solute in the two solutions)

Solving these equations,  x = 80 g and y = 120 g.

Therefore, we need 80 g of the 15% solution and 120 g of the 20% solution.

Problem 2:

we need 120 g of the 18% solution and 180 g of the 5% solution.

Let x be the mass of the 18% solution needed and y be the mass of the 5% solution needed.

x + y = 300

0.18x + 0.05y = 0.07(300)

Solving these equations, x = 120 g and y = 180 g.

Therefore, we need 120 g of the 18% solution and 180 g of the 5% solution.

Problem 3:

The mass percentage of the final solution is 135 g/550 g × 100% = 24.55%.

The total mass of the final solution is 200 g + 350 g = 550 g.

The total amount of solute in the final solution is:

0.15(200 g) + 0.20(350 g) = 65 g + 70 g = 135 g.

Therefore, the mass percentage of the final solution is 135 g/550 g × 100% = 24.55%.

Problem 4:

The mass percentage of the final solution is 110 g/335 g × 100% = 32.84%.

The total mass of the final solution is 300 g + 35 g = 335 g.

The total amount of solute in the final solution is:

0.15(300 g) + 35 g = 75 g + 35 g = 110 g.

Therefore, the mass percentage of the final solution is 110 g/335 g × 100% = 32.84%.

Problem 5:

The mass percentage of the final solution is 18.18%.

Calculate the final mass of the solution:

Final mass = 400 g + 150 g = 550 g

Calculate the mass of solute in the 25% solution:

Mass of solute = 0.25 x 400 g = 100 g

Calculate the mass percentage of the final solution:

Mass percentage = (mass of solute ÷ final mass) x 100%

Mass percentage = (100 g ÷ 550 g) x 100%

Mass percentage = 18.18%

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Answer:

Fallout is the radioactive particles that fall to earth as a result of a nuclear explosion. It takes around 10 seconds for the fireball from a nuclear explosion to reach its maximum size, but the effects last for decades and span across generations. Five to six years after the bombings, the incidence of leukaemia increased noticeably among survivors. After about a decade, survivors began suffering from thyroid, breast, lung and other cancers at higher than normal rates.

Explanation:

Nuclear fallout is the residual radioactive material propelled into the upper atmosphere following a nuclear blast, so called because it "falls out" of the sky after the explosion and the shock wave has passed. It commonly refers to the radioactive dust and ash created when a nuclear weapon explodes. By the end of 1945, the bombing had killed an estimated 140,000 people in Hiroshima, and a further 74,000 in Nagasaki. In the years that followed, many of the survivors would face leukemia, cancer, or other terrible side effects from the radiation. Pregnant women exposed to the bombings experienced higher rates of miscarriage and deaths among their infants; their children were more likely to have intellectual disabilities, impaired growth and an increased risk of developing cancer. And for all survivors, cancers related to radiation exposure still continue to increase throughout their lifespan, even to this day, seven decades later.

Answer: 1.311 × 10^18 photons are produced in each pulse

Explanation: Please see the attachments below

Answer:

7.87g/mL

Explanation:

density=mass/volume

density=157.4/20

density=7.87g/mL

We use the formula to determine how much heat is needed to warm a substance: m * c * deltaT = q

where q represents the amount of heat in calories, m represents the substance's mass in grammes, c represents its specific heat in calories per gram-degree Celsius, and deltaT represents the temperature change in degrees Celsius.

In this instance, we get:

m = 89.7 g

Initial temperature (which is not supplied to us) - deltaT = 44.1 °C

The specific heat of water is 1 calorie/gram-degree Celsius, albeit c changes depending on the item being heated.

As a result, by applying the formula, we can determine how much heat is needed to warm the substance:

q = (44.1 °C - starting temperature) * (1 calorie/gram-degree Celsius) * (89.7 g)

Without having knowledge of the initial temperature, we cannot fully answer the equation. On the basis of the equation, we can make certain observations, though.

A substance's bulk and the temperature change have a direct relationship with the quantity of heat needed to warm it. This implies that the quantity of heat needed to warm the substance grows as either of these variables increases.

In addition, compared to other materials, water has a comparatively high specific heat, which means that in contrast to other materials, a relatively big quantity of heat is required to raise the temperature of water by a given amount.

In conclusion, without knowledge of the initial temperature, we are unable to calculate the required amount of heat. The specific heat of water is quite high, however the amount of heat needed will depend on the mass of the substance and the temperature change.

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Answer:

Temperature, concentration, and a catalyst can all affect the rate of a chemical reaction.

Temperature: Increasing the temperature generally increases the rate of a reaction. This is because higher temperatures provide more kinetic energy to the reactant particles, causing them to move faster and collide more frequently. With increased collision frequency, the chances of successful collisions with sufficient energy to overcome the activation energy barrier and proceed with the reaction are also increased. As a result, the reaction rate typically increases with temperature.

Concentration: Increasing the concentration of reactants generally increases the rate of a reaction. When the concentration of reactant particles is higher, they become more crowded, increasing the likelihood of collisions between reactant particles. With more collisions occurring, there is a higher probability of successful collisions leading to a reaction. Therefore, higher reactant concentrations generally result in a higher reaction rate.

Catalyst: A catalyst is a substance that increases the rate of a reaction by providing an alternative reaction pathway with a lower activation energy. Catalysts themselves are not consumed during the reaction and do not undergo any permanent changes. They work by providing an alternative route that requires less energy for the reactants to reach the transition state. This lowers the activation energy barrier, making it easier for the reaction to occur. By providing an alternative pathway, catalysts increase the rate of reaction without being consumed in the process.

Regarding collision theory, the three key points required for a reaction to happen are:

Collision: Reactant particles must collide with each other for a reaction to occur. Collisions bring the reactant particles in close proximity, allowing them to interact and potentially form new chemical bonds.

Energy: Colliding particles must possess enough energy, equal to or greater than the activation energy, for the reaction to take place. Activation energy is the minimum energy required for the reactant particles to break existing bonds and initiate the formation of new bonds. Only collisions with sufficient energy can overcome the activation energy barrier and lead to a reaction.

Orientation: In addition to sufficient energy, the collision between reactant particles must occur with the correct orientation. This means that the particles must collide in a way that allows the necessary atoms or groups to come into contact and form new bonds. If the collision occurs with an incorrect orientation, the particles may simply bounce off each other without any reaction taking place.

In summary, according to collision theory, for a reaction to happen, reactant particles must collide with sufficient energy and the correct orientation. Temperature and concentration affect the rate of reaction by influencing collision frequency, while a catalyst provides an alternative reaction pathway with lower activation energy.

Answer:

The first one

Explanation:

Answer:

Percentage of oxygen = 73%

Explanation:

Given data:

Percentage of C in CO₂ = 27%

Percentage of O₂ in CO₂ = ?

Solution:

The percentage of carbon in carbondioxide is 27% then the percentage of oxygen will be calculated by subtracting the percentage of carbon from 100.

Percentage of oxygen = 100 - percentage of carbon

Percentage of oxygen = 100-27

Percentage of oxygen = 73%