How much would a 100 kg man weigh on the surface of
the Sun, where the acceleration due to gravity is 274 m/s²?
A. 10,000 N
B. 36,985 N
C. 27,400 N
D. 98 N

The volume of 6.25 × 10⁻⁴ molar ferroin solution needed to prepare   10 ml of 2.50 × 10 ⁻⁵ molar solution with deionized water is 0.4 ml.

Molarity is a term used to express the concentration of a solution. It is the ratio of number of moles of solute to the volume of solution in liters. The number of moles of the solute is thus the product of its molarity and volume in liters.

Let V1 and M1 be the volume and molarity of the stoke solution and V2 and M2 be the volume and molarity of the solution to be prepared from its. Then,

M1 V1 = M2 V2.

Given the molarity and volume of the solution to be prepared is  10 ml and 2.50 × 10 ⁻⁵ m respectively. The molarity of stoke solution is 6.25 × 10⁻⁴ molar. Thus, the volume of stoke solution needed to be added is calculated as follows:

volume = molarity of solution to be prepared × volume / molarity of stoke solution

            =  (2.50 × 10 ⁻⁵ m × 10 ml ) /6.25 × 10⁻⁴

            = 0.4 ml

Therefore, the volume of ferroin solution  needed to be added is 0.4 ml.

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Answer:

1234.56 MILLIGRAMS =0.00123 KILOGRAMS

To calculate the molality, we need to determine the moles of toluene and the mass of benzene. The molality of the solution is 0.703.

Molality (m) is defined as the moles of solute per kilogram of solvent. To calculate the molality, we need to determine the moles of toluene and the mass of benzene.

Given:

Mole fraction of toluene (x_toluene) = 0.100

Let's assume we have 1 mole of the solution. Then, the number of moles of toluene (n_toluene) would be:

n_toluene = x_toluene * 1 mole = 0.100 mole

The number of moles of benzene (n_benzene) would be:

n_benzene = 1 mole - n_toluene = 1 mole - 0.100 mole = 0.900 mole

The mass of benzene (m_benzene) can be calculated using its molecular weight (M_benzene):

m_benzene = n_benzene * M_benzene = 0.900 mole * 78.1 g/mol = 70.29 g

Now, we can calculate the molality (m) using the moles of toluene (n_toluene) and the mass of benzene (m_benzene):

m = n_toluene / (m_benzene / 1000 g/kg) = 0.100 mole / (70.29 g / 1000 g/kg) = 0.703 mol/kg

Therefore, the molality of the solution is 0.703, which corresponds to option (b).

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Answer:

tends to split along bands

Explanation:

Answer: C

Explanation: E2022

Polonium - 212 when goes through alpha radiation or alpha emission it gives isotope lead - 206 has atomic number 82.

Isotopes are members of a family of an element that all have the exactly same number of protons but they contain different numbers of neutrons in there structure. The number of protons in a nucleus verify  the element's atomic number of the molecule.

Elements having same atomic number but they are differ in mass number are called as isotopes . There are many isotopes present in periodic table. Atomic number is denoted by Z while mass number is denoted by M.

for example ; Carbon have different isotope i.e. C₁₂,C₁₃,C₁₄

Thus , lead - 206 which having atomic number 82 is isotope remains after the decay of alpha radiation of polonium - 212.

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To calculate the number of grams of phosphorus in 56.8 kg of sodium phosphate (Na3PO4), we need to first determine the percentage of phosphorus in Na3PO4:

The molar mass of Na3PO4 is:

Na = 22.99 g/mol (3 atoms)

P = 30.97 g/mol (1 atom)

O = 15.99 g/mol (4 atoms)

Total molar mass = 163.94 g/mol

The mass of phosphorus in 1 mole of Na3PO4 is:

30.97 g/mol

So, the percentage of phosphorus in Na3PO4 is:

(30.97 g/mol / 163.94 g/mol) x 100% = 18.89%

Therefore, in 56.8 kg of Na3PO4, the mass of phosphorus is:

56.8 kg x 18.89% = 10.73 kg

Converting 10.73 kg to grams:

10.73 kg x 1000 g/kg = 10,730 g

Therefore, there are 10,730 grams (or 10.73 kg) of phosphorus in 56.8 kg of sodium phosphate (Na3PO4).

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Transesterification is a chemical reaction that involves the exchange of an ester group in one molecule with an alcohol group in another molecule.

In the case of the given question, the transesterification reaction of ethyl butanoate with propanol will result in the formation of ethyl propanoate. This is because the ester group of ethyl butanoate is replaced with the alcohol group of propanol, resulting in the formation of a new ester, ethyl propanoate. This reaction is often used in the production of biodiesel, where vegetable oils are transesterified with methanol or ethanol to form fatty acid methyl or ethyl esters. Propanol, on the other hand, is not commonly used in transesterification reactions due to its high cost and low reactivity compared to methanol and ethanol.

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If an object is added to a graduated cylinder containing 12.5 mL of water. If the volume of the object is 7.6 mL, then the new volume of the water in the graduated cylinder would be 20.1 mL, therefore the correct answer is option D.

It can be defined as the mass of any object or body per unit volume of the particular object or body.

As given in the problem an object is added to a graduated cylinder containing 12.5 mL of water. If the volume of the object is 7.6 mL,

The new volume in the graduated cylinder = 12.5 + 7.6

                                                                        = 20.1 mL

If something is put in a graduated cylinder with 12.5 mL of water in it. The new volume of water in the graduated cylinder if the object's capacity is 7.6 mL would be 20.1 mL, hence option D is the proper response.

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1. The products of the reaction are NH₄Cl and BaCO₃

2. The balanced equation is:

BaCl₂(aq) + (NH₄)₂CO₃(aq) → 2NH₄Cl(aq) + BaCO₃(s)

We must understand, that every reaction has basically two sides. This includes:

The reactants are located on the left hand side while the products are located on the right hand side as shown below:

Reactants -> Products

Now lets consider the equation given from the question.

BaCl₂(aq) + (NH₄)₂CO₃(aq) →

During the reaction, there shall be exchange of ions to produce the following products:

BaCl₂(aq) + (NH₄)₂CO₃(aq) → NH₄Cl(aq) + BaCO₃(s)

Thus, the products are:  NH₄Cl and BaCO₃

Now, we shall balance the equation as follow:

BaCl₂(aq) + (NH₄)₂CO₃(aq) → NH₄Cl(aq) + BaCO₃(s)

There are 2 atoms of Cl on the left side and 1 atom on the right. It can be balanced by writing 2 before NH₄Cl as shown below:

BaCl₂(aq) + (NH₄)₂CO₃(aq) → 2NH₄Cl(aq) + BaCO₃(s)

Thus, the equation is balanced.

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Answer:

Lime(Calcium Oxide) is a white solid with strongly basic properties.Lime reacts readily with water to produce slaked lime,which is the chemical compound calcium hydroxide.....

When carbon dioxide gas is passed through or over limewater,it turns milky due to the formation of calcium carbonate.

Based on the given isotopic composition, the relative contribution of C3 plants is higher compared to C4 plants in the soil organic matter of Kenya.

To determine the relative contribution of C3 and C4 plants to the soil organic matter in Kenya based on their stable carbon isotopic composition, we can use the concept of isotopic discrimination.

C3 and C4 plants have different photosynthetic pathways, and they exhibit distinct carbon isotope signatures. C3 plants typically have a more negative δ13C value (around -30 permil to -22 permil), while C4 plants have a less negative δ13C value (around -16 permil to -9 permil).

In this case, the soil organic matter in Kenya has a δ13C value of -18 permil, while the air δ13C value is -7 permil. The difference between these values (-18 permil - (-7 permil)) gives us the isotopic discrimination between the atmosphere and the soil organic matter.

δ13C discrimination = δ13C organic matter - δ13C atmosphere

δ13C discrimination = -18 permil - (-7 permil)

δ13C discrimination = -11 permil

Since the δ13C discrimination is negative, it suggests that C3 plants have a dominant contribution to the soil organic matter. C4 plants, with their less negative δ13C values, are less likely to contribute significantly to the organic matter in this case.

Therefore, based on the given isotopic composition, the relative contribution of C3 plants is higher compared to C4 plants in the soil organic matter of Kenya.

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The enthalpy of the reaction as written is approximately 239,306 J/mol.

To calculate the enthalpy of the reaction, we need to use the heat released (2330 J) and the amount of sodium reacted (0.224 g) to determine the heat released per mole of sodium reacted.

The molar mass of sodium (Na) is 22.99 g/mol.

First, we need to calculate the number of moles of sodium reacted:

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

Number of moles of Na = 0.224 g / 22.99 g/mol ≈ 0.00974 mol

Next, we can calculate the enthalpy change (ΔH) per mole of sodium reacted:

ΔH = Heat released / Number of moles of Na

ΔH = 2330 J / 0.00974 mol ≈ 239306 J/mol

Enthalpy (H) is a thermodynamic property that represents the total heat content of a system at constant pressure. It includes the internal energy of the system plus the product of pressure and volume. Enthalpy is often used to describe heat changes in chemical reactions, where the difference in enthalpy between the reactants and products determines whether a reaction is exothermic (releases heat) or endothermic (absorbs heat). Enthalpy is typically measured in joules (J) or kilojoules (kJ).

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If one form of a gene can mask the appearance of another form, that form is considered dominant over the other form. Option B.

According to Mendel, genes are usually made up of 2 alleles. These alleles can be the same or different. When the alleles are the same, the gene is said to be homozygous. If the alleles are different, the gene is said to be heterozygous.

When the two alleles that make up a gene are different, one will be dominant and the other will be recessive. The dominant gene masks the effect of the recessive gene. In other words, the recessive gene cannot be expressed as long as it coexists with the dominant gene. In order for it to be expressed, it has to be in two copies or a homozygous recessive form.

For the dominant allele, however, only one copy is needed for it to be expressed.

In summary, if one form of a gene can mask the appearance of another form, that form is considered dominant over the other form.

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The pH of the 0.045 M solution of a weak acid that has ka = 1.2 x10-⁵ is 3.97.

The pH of a solution is a measure of the acidity or alkalinity of that solution.

The pH of a solution is the negative logarithm of the hydrogen ion concentration in the solution.

Since weak acids are not completely ionized in solution, the Henderson-Hasselbalch equation is used to determine pH. The Henderson-Hasselbalch equation is expressed as

pH = pKa + log([A⁻] / [HA]

Where;

pKa = -log(Ka)

[A⁻] is the concentration of the conjugate base

[HA] is the concentration of the weak acid

Acid Ka = 1.2 * 10⁻⁵

[A⁻] = [H⁺] = x.

[HA] = 0.045 M - x.

Ka = [A⁻]·[H⁺] / [HA].

1.2·10⁻⁵ = x² / (0.045 M - x).

Solve quadratic equation: [H⁺] = 0.00001199M.

pH = -log[H⁺].

pH = -log(0.00001199 M).

pH = 4.92

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The boiling points of HF, H2O and NH3 increase in the order of  NH3 < HF < H2O. Therefore, option D is correct.

​

The melting points and boiling points increase down the group because of the van der Waals forces. The size of the molecules changes down the group. This increase in size intends an increase in the property of the van der Waals forces.

Water can produce more hydrogen bond in comparison to the Hydrogen fluoride and Ammonia . If we see the bond polarity then must be HF > H2O > NH3. But in this condition major finding factor is Hydrogen bond so, the order is NH3 < HF < H2O.

Thus, option D is correct.

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Answer:

These are largely the result of human reliance on fossil fuels and heavy industry, but can also be due to the accumulation of waste, modern agriculture, and other man-made processes. The combustion of fossil fuels like coal, petroleum and other factory combustibles is a major cause of air pollution

Answer:

6.6M

Explanation:

C=concentration

V=Volume

C1V1=C2V2

rearrange formula to find C2

(C1V1)/V2= C2

(12M x 550mL)/1000mL= C2

6600M*mL*/1000*mL* =C2 (cancel units)

6.6M=C2

Answer:

False, the empirical formula denotes the smallest whole-number ratio of atoms in a compound

Explanation:

a molecular formula is the total number of atoms in the compound

The first two chemical equations are reversible while the other two are irreversible.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

Its a mixture.

The amount of dry NH₄HCl needed to prepare a buffer solution that has a pH of 8.56 is 188.29 grams.

To prepare the buffer solution with a pH of 8.56, first, we need to calculate the concentration of NH₄⁺ ions using the Henderson-Hasselbalch equation:

pH = pKa + log([NH₄⁺]/[NH₃])

Since we have pH and [NH₃], we need to find pKa using Kb for ammonia:

Kb = 1.8 × 10⁻⁵
Kw = 1 × 10⁻¹⁴ (ion product of water)

Ka = Kw / Kb = 1 × 10⁻¹⁴ / 1.8 × 10⁻⁵ = 5.56 × 10⁻¹⁰
pKa = -log(Ka) = 9.26

Now, we can use the Henderson-Hasselbalch equation:

8.56 = 9.26 + log([NH₄⁺]/(0.800))

Rearranging to find [NH₄⁺]:

[NH₄⁺] = 0.800 * 10^(9.26 - 8.56) = 0.800 * 10^(0.70) = 1.6 M

Now, we can calculate the grams of NH₄Cl needed to achieve this concentration:

1.6 mol/L * 2.20 L = 3.52 mol of NH₄Cl

Finally, convert moles to grams using the molar mass of NH₄Cl (53.49 g/mol):

3.52 mol * 53.49 g/mol = 188.29 g

So, you need to add 188.29 grams of dry NH₄Cl to the 2.20 L of 0.800 M NH₃ solution to prepare the buffer with a pH of 8.56.

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Option (b) K + Br₂  → 2KBr is the chemical reaction that does not follow the law of conservation of mass.

According to the law of conservation of mass or principle of mass conservation in physics and chemistry, any system that is closed to all transfers of matter and energy must have a constant mass over time because the mass of the system cannot change, meaning that neither more nor less of the quantity can be added or taken away.

The Law of Conservation of Mass has been in force ever since Antoine Lavoisier discovered that mass is neither created nor destroyed during chemical reactions. For instance, the carbon atom in coal burns and becomes carbon dioxide. Although the carbon atom's shape changes from solid to gas, its mass remains constant.

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Answer:

A baseball speeds up as it falls through the air.

Yes.  Forces on the balloon are unbalanced.

The balloon is speeding up, so we know that the downward force

of gravity is stronger than the upward force of air resistance.

A soccer ball is at rest on the ground.

No. The ball is not accelerating, so we know that the forces on it

are balanced.

The downward force of gravity on the ball and the upward force

of the ground are equal.

An ice skater glides in a straight line at a constant speed.

No. The skater's speed and direction are not changing, so he is not

accelerating.  That tells us that the forces on him are balanced.

A bumper car hit by another car moves off at an angle.

Yes.  The direction in which the car was moving changed.

That's acceleration, so we know that the forces on it are unbalanced,

at least at the moment of impact.

A balloon flies across the room when the air is released.

Yes.  The balloon was not moving. But when the little nozzle was

opened, it started to zip around the room.  So its speed changed.

And, as it goes bloozing around the room, its direction keeps changing too.

There's a whole lot of acceleration going on, so we know the forces on it

are unbalanced.

Electronegativity across a period: increases.

Electronegativity down a group: decreases.

Explanation:

Just did on Edge 2021

Electronegativity across a period increases and Electronegativity down a group decreases.

Electronegativity, symbolized as χ, is the tendency for an atom of a given chemical element to attract shared electrons when forming a chemical bond.

An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus.

On the periodic table, electronegativity generally increases as we move from left to right across a period and decreases as you move down a group.

As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.

Hence, Electronegativity across a period increases and Electronegativity down a group decreases.

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To solve this problem, let's use the definition for molarity:

Replacing the values of the problem:

Now, to find the mass, we multiply by the molecular weight of NaCl. (Which is about 58.44g/mol)

The answer is approximately 22.2g of NaCl

The balanced chemical equation for the reduction of copper(II) chloride to copper metal by the addition of electrons is:

Cu2+(aq) + 2e- -> Cu(s)

The molar mass of copper is 63.55 g/mol.

To determine the number of moles of electrons required, we need to first calculate the number of moles of copper present in 26.1 g of copper.

moles of copper = mass / molar mass

moles of copper = 26.1 g / 63.55 g/mol

moles of copper = 0.411 mol

According to the balanced chemical equation, 2 moles of electrons are required for the reduction of 1 mole of Cu2+.

Therefore, the number of moles of electrons required for the reduction of 0.411 mol of Cu2+ is:

moles of electrons = 2 x moles of Cu2+

moles of electrons = 2 x 0.411 mol

moles of electrons = 0.822 mol

So, 0.822 moles of electrons are required to produce 26.1 g of copper metal from a solution of aqueous copper(II) chloride.

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Answer:

Depends how your flirting

Explanation:

Answer:

yes, because if you love someone you wont want anyone else. therefore if you flirt your giving someone else the attention your significant other is suppose to get from you.

Explanation:

yes your are right because water do have a stronger attraction