Migration can best enhance the survival of individuals because it

Answer: The correct option is b) 600

Explanation:

Molecules are formed when two atoms of same or different elements combine together.

Atoms are the smallest unit of matter that combines to form a compound.

For the given chemical compound, \(CH_3CO_2H\)

Given number of molecules = 300 molecules

In 1 mole of the given chemical compound, there are 2 atoms of carbon, 4 atoms of hydrogen and 2 atoms of oxygen

Number of atoms of oxygen = \(2\times \text{Number of molecules of compound}\)

Number of atoms of oxygen = \(2\times 300=600atoms\)

Hence, the correct option is b) 600

Answer: 600

Explanation:

Answer:

1 mole of magnesium are required to react with 2.0 mol of hydrochloric acid.

Explanation:

The balanced reaction is:

Mg + 2 HCl → MgCl₂ + H₂

The law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products. That is, the law of conservation of mass implies that the sum total of charges before and after the chemical reaction remains constant.

The relationships between the quantities of reactants consumed and products formed depend directly on this conservation law, and therefore can be determined by an equation that describes them. This equality is called the stoichiometric equation.

In this case, by stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), you have:

Then, 1 mole of magnesium are required to react with 2.0 mol of hydrochloric acid.

Answer:

1 mole of magnesium, Mg

Explanation:

The balanced equation for the reaction is given below:

Mg + 2HCl —> MgCl₂ + H₂

From the balanced equation above,

We can see clearly that 1 mole of Mg requires 2 moles of HCl.

Thus, 1 mole of magnesium, Mg is needed for the reaction.

Answer:

Autumn is one of the four basic seasons of the year in the temperate climate zone. It is characterized by moderate air temperatures with a decreasing daily average, and relatively high annual precipitation. The climate autumn is the period of the year in which the average daily air temperature ranges around 10° C.

Astronomical fall begins at the fall equinox and lasts until the winter solstice, which roughly means in the southern hemisphere between March 23 and June 22 (sometimes these dates are a day earlier or a day later, and in a leap year they may be additionally retracted one day). During astronomical autumn, the day time of the day is shorter than the night time, and moreover, with each successive day of the day it decreases and night increases.

The volume of hydrogen gas required to synthesize 35.7 g of methanol at a temperature of 355 K and a pressure of 738 mmHg is approximately 96.5 liters.

To solve this problem, we can use the Ideal Gas Law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature.
First, we need to convert the given pressure from mmHg to atm, which is the unit of pressure used in the Ideal Gas Law. We can do this by dividing the given pressure by 760 mmHg/atm:
738 mmHg ÷ 760 mmHg/atm = 0.971 atm
Next, we need to calculate the number of moles of hydrogen gas required to synthesize 35.7 g of methanol. Methanol has the chemical formula CH3OH, so its molar mass is:
12.01 g/mol (C) + 3(1.01 g/mol) (H) + 16.00 g/mol (O) = 32.04 g/mol
Thus, 35.7 g of methanol is equivalent to:
35.7 g ÷ 32.04 g/mol = 1.11 mol
The balanced chemical equation for the synthesis of methanol from hydrogen gas is:
CO2 + 3H2 → CH3OH
This equation shows that 3 moles of hydrogen gas are required to synthesize 1 mole of methanol. Therefore, we need:
3 mol H2/mol CH3OH × 1.11 mol CH3OH = 3.33 mol H2
Finally, we can use the Ideal Gas Law to solve for the volume of hydrogen gas required:
PV = nRT
V = nRT/P
V = (3.33 mol)(0.0821 L·atm/mol·K)(355 K)/0.971 atm
V ≈ 96.5 L
Therefore, the volume of hydrogen gas required to synthesize 35.7 g of methanol at a temperature of 355 K and a pressure of 738 mmHg is approximately 96.5 liters.

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Answer:

2 electrons will move from magnesium to oxygen

Explanation:

Valence electrons have higher energy than the electrons in inner orbits, valence electrons participate in chemical reactions. A certain element's chemical characteristics can also be determined by the quantity of valence electrons that are present. The correct option is C.

The amount of electrons an atom must gain or lose in order to achieve the electrical configuration of the nearby noble gas or inert gas is known as valence. "Valence electrons" are described as "non-filled electrons in the outer shells."

The s and p electrons in the outermost shell are valence electrons. Core electrons are those found in the inner shell. Valence electrons are minuscule subatomic particles that we come across as we examine and investigate an element's atom. We can trace the valence electrons and forecast the sorts of bonds with the aid of Lewis structures.

'Mg' has two valence electrons and 'O' has six valence electrons. So 'Mg' loses its two electrons to 'O' to attain the octet.

Thus the correct option is C.

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The correct statement is: For equal concentrations and equal path lengths, solutions of (+) and (-) enantiomers rotate plane-polarized light equally, but in opposite directions.

This is known as optical rotation, which is the phenomenon of rotating the plane of polarized light by chiral compounds. Enantiomers are mirror images of each other and have equal and opposite specific rotations. The (+) enantiomer rotates plane-polarized light clockwise and the (-) enantiomer rotates it counterclockwise by the same amount. Therefore, their optical rotations cancel out in equal concentrations and equal path lengths, resulting in no net rotation of the plane of polarized light.

Compounds with R stereocenters do not necessarily rotate plane-polarized light clockwise. The direction of optical rotation depends on the absolute configuration of the molecule and not just the R or S designation.

Racemic mixtures have equal amounts of both enantiomers, which cancel out each other's optical rotations and result in no net rotation of the plane of polarized light.

Meso compounds do not rotate plane-polarized light because they have an internal plane of symmetry that cancels out the optical rotation of each half of the molecule.

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The molar mass of element X is 75 g/mol.

m(X₄O₆) = 59.4 g; mass of the compound

m(O) = 14.4 g; mass of oxygen in the compound

n(O) = 14.4 g ÷ 16 g/mol

n(O) = 0.9 mol; amount of oxygen in compound

m(X) = m(X₄O₆) - m(O)

m(X) = 59.4 g - 14.4 g

m(X) = 45.0 g; mass of element X

Ratio of the elements in the compound: n(X) : n(O) = 4 : 6.

n(X) = 0.9 mol × 4 / 6

n(X) = 0.6 mol; amount of element X in the compound

M(X) = m(X) ÷ n(X)

M(X) = 45.0 g ÷ 0.6 mol

M(X) = 75 g/mol; molar mass of element X

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The enthalpy change of the reaction -

CH₄ + 2O₂ = CO₂ + 2H₂O is -808kJ/mol.

Enthalpy is the measurement of energy in a thermodynamic system. The quantity of enthalpy equals to the total content of heat of a system, equivalent to the system’s internal energy plus the product of volume and pressure.

For a process taking place at constant pressure, the enthalpy change is equal to the heat absorbed or evolved. If the enthalpy change is positive, heat is absorbed and the reaction is endothermic. If the enthalpy change is negative, heat is evolved and the reaction is termed exothermic.

Given,

Enthalpy change = Sum of bond energies of reactants - sum of bond energies of products

= (4 × C-H) + (2 × O = O) - (2 × C = O) + (4 × O-H)

= [( 4 × 413 ) + ( 2 × 495 )] - [( 2 × 799 ) + ( 4 × 463 )]

= (1652 + 990) - (1598 + 1852)

= 2642 - 3450

= -808 kJ/ mol

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The effect of errors on the calculated concentration of CI is significant.

A 10.00 mL diluted chloride sample was titrated with 0.02749 M AgNO3, and 16.51 mL AgNO, was required to reach the endpoint. The effect of errors on the calculated concentration of CI can be explained as follows:a. The student read the molarity of AgNO, as 0.02479 M instead of 0.02749 M. If the student read the molarity of AgNO, as 0.02479 M instead of 0.02749 M, then the experimentally calculated moles of Ag would be too high. Consequently, the calculated [CI] in the unknown would come out too low. b.

The student was past the endpoint of the titration when the final buret reading was taken. If the student was past the endpoint of the titration when the final buret reading was taken, then the experimentally determined moles of Ag would be too low. This would cause the calculated C1 concentration to come out too high. Consequently, the calculated moles of CI would come out too high. Therefore, the effect of errors on the calculated concentration of CI is significant.

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Answer:

P = 200/5 = 40 Pa.

If this helped hit the heart. Have a nice day :-)

Answer: 300 g

Explanation: I guessed and got it right

420 liter of volume is occupied by 300 grams of methane gas at standard temperature and pressure (STP).

Ideal gas equation of methane gas at STP (standard temperature pressure) can be written as:

PV = nRT, where

P = pressure = 1 atm

V = volume = 420 L (given)

R = universal gas constant = 0.082 L.atm / k.mole

T = absolute temperature = 273 K

n = no. of moles to find?

Putting all these values in the above equation and calculated for the n:

n = (1 × 420) / (0.082 × 273) = 18.76 moles

Now we calculate mass of methane by the definition of moles as:

n = W/M, where

M = molar mass of methane = 16 g/mole

W = to find?

W = 18.76 × 16 = 300.2 grams or 300grams.

Hence, option (c) is correct i.e. 300 grams of methane occupy 420 L volume.

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The pH of the resulting solution is 9.96 that can be calculated by using the using the pOH values.

Buffer Solution is a water solvent primarily based totally answer which includes a combination containing a vulnerable acid and the conjugate base of the vulnerable acid, or a vulnerable base and the conjugate acid of the vulnerable base. They face up to a alternate in pH upon dilution or upon the addition of small quantities of acid/alkali to them.

Millimoles of NH3 = 0.316 x 250 = 79

Millimoles of NH4Br = 0.339 x 250 = 84.75

Millimoles of KOH = 57.3

pOH  = pKb + log [salt - C / base + C]

       = 4.74 + log [84.75 - 57.3 / 79 + 57.3]

      = 4.04

pH + pOH=14

pH=14-4.04

pH = 9.96

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To buy two chocolate bars, one pack of peanuts, and a can of soda with a snack machine that only accepts 5-centavo coins, we need to Solve the Equation to calculate the total cost and the number of coins required. The answer to this question is 21 coins.

One chocolate bar costs 25 cent, so two chocolate bars cost 25 x 2 = 50 cent.One pack of peanuts costs 75 cent.A can of soda costs 50 cent.The total cost of these snacks is 50 + 75 + 50 = 175 cent.Now, we need to find how many 5-centavo coins make up 175 cent.1 centavo is equal to 0.05 cents.Therefore, 175 cent is equal to 175/0.05 = 3,500 centavos.

To find the number of 5-centavo coins required, we need to divide 3,500 by 5.3,500 ÷ 5 = 700 coins.So, it will take 700 5-centavo coins to buy two chocolate bars, one pack of peanuts, and a can of soda.

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Answer:

1.8 micrograms

1.8 milligrams

1.8 grams

1.8 kg

Answer:

\(2.47x10^{25}atoms\)

Explanation:

Hello,

In this case, since the mineral torbernite has one copper atom, two uranium atoms, twenty oxygen atoms (2x2+4x2+8), two phosphorous atoms and sixteen hydrogen atoms (12x2) and therefore forty one in total, by using the Avogadro's number one is able to compute the total number of atoms in one formula unit or one mole:

\(Atoms=1molCu(UO_2)_2(PO_4)_2\dot \ 8H_2O*\frac{41mol\ of \ atoms}{1molCu(UO_2)_2(PO_4)_2\dot \ 8H_2O}*\frac{6.022x10^{23}atoms}{1mol\ of \ atoms} \\\\=2.47x10^{25}atoms\)

Best regards.

It has been examined, tested and supported over centuries. The law of conservation of mass, which states that the mass of an isolated system remains constant, has been tested and supported for centuries, making it a scientific law, not just a hypothesis.

Hypothesis is a proposed explanation for a phenomenon or a solution to a problem that can be tested through further investigation. It is an educated guess based on observations and prior knowledge. Hypotheses are used to develop experiments, draw conclusions, and refine or reject prior theories. Hypotheses can be used to develop a theoretical framework and inform the design of future research studies.

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The location of resources a concern, because some areas have more access to resources than others, Human populations are sometimes concentrated in areas that are lacking resources, and areas with fewer resources may need to buy resources from other areas. Therefore, option D is correct.

Natural resources are substances obtained from the planet that are utilised to sustain life and provide for human needs. A natural resource is something that comes from nature that humans use.

Natural resources include things like stone, sand, metals, oil, coal, and natural gas. Air, sunshine, soil, and water are examples of other natural resources.

Resources are more easily accessible in some places than others. There are periods when human populations are concentrated in places with few resources. Localities with limited resources could be forced to import resources.

Thus, option D is correct.

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The approximate temperature at which it is desirable to heat each of the following iron-carbon alloys during a full anneal heat treatment

(a) 0.25 wt% C - 700-760°C.

(b) 0.45 wt% C - 730-790°C.

(c) 0.85 wt% C - 760-815°C.

(d) 1.10 wt% C - 780-840°C.

During a full anneal heat treatment, it is desirable to heat the following iron-carbon alloys to the approximate temperatures listed below:

(a) 0.25 wt% C - The desirable temperature for annealing this alloy is around 700-760°C.

(b) 0.45 wt% C - The desirable temperature for annealing this alloy is around 730-790°C.

(c) 0.85 wt% C - The desirable temperature for annealing this alloy is around 760-815°C.

(d) 1.10 wt% C - The desirable temperature for annealing this alloy is around 780-840°C.

During annealing, the alloy is heated to a temperature below its melting point, held at that temperature for a specific period, and then slowly cooled down to room temperature. This process helps to reduce the internal stresses and improve the ductility of the metal. The temperature ranges mentioned above are approximate and may vary depending on the specific alloy composition, size, and shape of the material. It is important to carefully control the temperature and time during the annealing process to achieve the desired material properties.

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Answer:

Explanation:

Option D is the correct answer

Answer:

3d

Explanation:

answer D

The statement "Transition theory focuses on the formation of the complex, which exists at the moment of highest energy in a reaction" is true. Therefore, option A is correct.

The transition state theory is a chemical reaction theory that explains the structure and reactivity of reactive intermediates during a chemical reaction. The transition state theory posits that as a reaction progresses from reactants to products, there must be a moment at which the reactive system is at its highest potential energy.

During this phase, which is known as the transition state, the molecule has a high degree of energy. The rate of reaction can be predicted by comparing the energy barriers that must be overcome during the reaction. The energy needed to get over the energy barrier is referred to as the activation energy, and the transition state theory postulates that this energy is the only barrier that must be overcome for the reaction to proceed.

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Answer:

7.63 × 10²³ molecules

Explanation:

First, convert grams to moles using the molar mass of water (32.988 g/mol).

41.8 g  ÷  32.988 g/mol  =  1.267 mol

Next, convert moles to molecules using Avogadro's number (6.022 × 10²³).

1.267 mol  ×  6.022 × 10²³ molecules/mol = 7.63 × 10²³ molecules

Answer:

Sample A=40 Sample B=50

Explanation:

32+48=80

32/80x100=40

The 100 is to convert it to a percentage

___________________________

Sample B

same thing

30+30=60

30/60x100=50

The mass percent of sulfur in compound B is 50 %

Mass percent is defined as a way of expressing a concentration or describing the component in a particular mixture.

It can also be defined as a mass of a element or solute divided by the mass of compound or solvent.  

Mass percent of sulfur of sample A

= 32 + 48 = 80

= 32 / 80 x 100

= 40 %

Mass percent of sulfur of sample B

= 30 + 30 = 60

= 30 / 60 X 100

= 50 %

Thus, the mass percent of sulfur in compound B is 50 %

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part 1.

The value of the equilibrium constant is  2.08

part 2.

The value of the of Kc is 120.

For part 1.

The equation for the equilibrium reaction is:

SO3 (g) + H2O (g) → 2 H2SO4 (l)

Kc = [H2SO4]^2 / ([SO3][H2O])

Substituting  in the  values, we :

Kc = (0.600 M)^2 / (0.400 M * 0.480 M) = 2.08

For part 2.

PC15 (s) + H2O (g) → 2HCl (g) + POC13 (g)

Kc = ([HCl]^2 * [POC13]) / ([PC15] * [H2O])

Substituting in the values, we have  :

Kc = (0.750^2 * 0.500 M) / (0.075 M * 0.050 M) = 120.

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Answer:

protons and electrons

Explanation:

protons give off a positive charge and electrons give off a negative charge

Answer:

The Answer Is C

To determine the molarity of the dichromate in the volumetric flask before it reacts with the Fe(II) in the sample, please follow these steps.

1. Identify the initial concentration and volume of the dichromate solution. This information is usually given in the problem or can be found through a series of calculations.

2. Calculate the moles of dichromate ions using the initial concentration and volume. To do this, use the formula: moles = concentration x volume.

3. Find the volume of the volumetric flask. This information is typically given in the problem or can be measured.

4. Determine the molarity of the dichromate in the volumetric flask. To do this, use the formula: molarity = moles / volume of the flask.

By following these steps, you can determine the molarity of the dichromate in the volumetric flask before it reacts with the Fe(II) in the sample.

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Answer:

this is the result

Explanation:

36.0

BE=4

36.0÷4

= 9

While picking up a buret, an unknown solution left by a previous solution drips onto your hand - Gloves

While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand onto the floor - Closed-toe shoes

While checking on a stirring solution, the solution splashes up towards your face - Goggles

While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench - Lab coat

Explanation:

So, according to the question. the matches will be:

While picking up a buret, an unknown solution left by a previous solution drips onto your hand - Gloves

While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand onto the floor - Closed-toe shoes

While checking on a stirring solution, the solution splashes up towards your face - Goggles

While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench - Lab coat

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In an alloy, the strength of the material is influenced by various factors, including the presence of solid solution strengthening.

Solid solution strengthening occurs when one element is dissolved in another, leading to the distortion of the crystal lattice and hindering dislocation movement, thereby increasing the material's strength.

Given that the strength of an alloy with 10% nickel is 150 MPa, we can expect that the strength of an alloy with 20% nickel would be higher. Increasing the percentage of nickel in the alloy leads to a greater distortion of the crystal lattice, resulting in stronger interactions between the dissolved nickel atoms and the copper matrix. This increased interaction prevents dislocations from moving easily, thus improving the strength of the alloy.

The exact increase in strength cannot be determined without additional information or knowledge of the specific properties of the nickel-copper system. However, based on general trends, we can anticipate that the strength of the alloy with 20% nickel would be greater than 150 MPa. The increase in nickel concentration would likely result in a stronger solid solution strengthening effect, leading to an overall stronger alloy.

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