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A student has a 5.00 gram sample of calcium chloride (CaCl2) solid. How many moles of calcium chloride are

contained in this sample?

If you're attempting to synthesize 2 benzyl pentanoic acid from acetoacetic ester, keep in mind that you can do so fairly quickly by following these simplified instructions:

From its pungent free scent to its solid state at temperatures ranging from 118 120°C, acetoacetic ester (better known as ethyl acetoacetate) offers significant value for those working within organic synthesis.

As one of many potent ketones utilized by researchers around the globe its unique properties make it ideal for building complex molecules essential for modern medicine and more.

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Answer: arterioles

Explanation:

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

Answer:

Actual yield reduces the more.

Explanation:

An actual yield of the course of a chemical reaction is the mass of a product actually obtained from the reaction.

In practice you see it and It is usually less than the theoretical yield.

Various reasons may come up to explain this away but here is one:

• incomplete reactions, simply put here some of the reactants do not react to form the product.

The same applies in the question about the actual yield will reduce significantly in molar mass now that insufficient amount of reagent are used.

Answer:

V «T, 1/P, n (Product of

Temperature, Half of pressure, and Moles)

Explanation: If V o n, V « 1/P, and V T

then, V« T, 1/P, n

Answer:

On the off chance that the wavelength(λ) maximum worth has been changed to 520 nm from 470 nm on the spectrophotometer, less light would be absorbed and in this way %T would be higher than the one found at 470 nm. The wavelength utilized at 520 nm isn't adequate for the excitation and consequently lesser light is absorbed by the arrangement.

Explanation:

A spectrophotometer is an analytical equipment used to quantitatively gauge the transmission(passage) or impression of visible light, UV light or infrared light through a medium.

Transmittance (τ) is the ratio of the brilliant or luminous flux at a given wavelength that is transmitted to that of the incident radiation.

where, Keq is the equilibrium constant.

On the off chance that the wavelength(λ) has been changed to 520 nm from 470 nm on the spectrophotometer, less light would be absorbed and in this way %T would be higher than the one found at 470 nm.

A spectrophotometer is an analytical equipment used to quantitatively gauge the transmission(passage) or impression of visible light, UV light or infrared light through a medium. Transmittance (τ) is the ratio of the brilliant or luminous flux at a given wavelength that is transmitted to that of the incident radiation. The wavelength utilized at 520 nm isn't adequate for the excitation and consequently lesser light is absorbed by the arrangement. As the concentration goes up, more radiation is absorbed and the absorbance goes up. Therefore, the absorbance is directly proportional to the concentration.

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Ratio of moles of NH₃ produced to moles of N₂ used: 2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used: 2 moles of NH₃ / 3 moles of H₂

From the balanced chemical equation:

N₂ + 3 H₂ ⟶ 2 NH₃

We can determine the ratio of moles of products to the moles of each reactant.

Ratio of moles of NH₃ produced to moles of N₂ used:

From the balanced equation, we can see that 1 mole of N₂ reacts to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used:

From the balanced equation, we can see that 3 moles of H₂ react to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 3 moles of H₂

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Given the equation of reaction;

N₂ + 3 H₂ ---> 2 NH₃

Calculate the ratio of the moles of produced to the moles of each of the reactants used. (Write two separate ratios.)

Answer:

The sun provides most of the energy on earth because it is the earth's (and the solar system's) greatest source of heat and light.

Explanation:

The process of photosynthesis in plants uses the energy from the sun and converts that energy to be used for plants.
The burning of fossil fuels produces greenhouse gases which trap the heat in our earth's atmosphere (causing global warming).

Answer:

Answer Below ↓

Explanation:

If the moving sand hits an obstacle, it stops due to the friction created by the contact and its kinetic energy is then transformed into thermal energy, or heat.

Answer:

The answer for this selection is 4

Explanation:

The balanced chemical equation in acidic solution is as follows: Cr₂O₇²−(aq) +  3 HNO₂(aq) ⎯→2  Cr₃+(aq) + 3 NO₃−(aq) + 4 H₂O(l).

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.

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:

Explanation:

m= 80.0 g

Cp=0.8 J/gc

Change in T= 25

q=Cp X m X T  =0.8 X 80.0 X 25 =1600J

Postive q or enthalpy makes it endothermic.

Answer:

44 g/m

Explanation:

Answer:

see below

Explanation:

1- lattice

2- regular

3- positive

4- negative

5- alternate

6- strong

7- bonds

8- giant

Statement C is not true. A combination reaction is not called retrosynthesis.

Retrosynthesis is a term used in organic chemistry to describe the process of planning the synthesis of a complex molecule by breaking it down into simpler precursor compounds. On the other hand, a combination reaction refers to a chemical reaction where two or more substances combine to form a single compound.

Examples of combination reactions include the reactions mentioned in statements A and D, where magnesium reacts with oxygen to form magnesium oxide and sodium reacts with chlorine to form sodium chloride, respectively.

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Answer: The concentration(molarity) of the solution will be 1.35 X10-4 M

Explanation: Molarity is defined as number of moles of solute present in one litre of any solution.

Mathematically,

Molarity= no of moles of solute/volume of solution(in liters)

M=N/V(liters)

Also upon dilution the number of moles of the solution remain unchanged

Therefore initial no of moles(before dilution)= final no of moles(after dilution)

M1V1=M2V2

According to the question,

Molarity of Na2S04 before dilution(M1)=1.5 M

Volume of NA2SO4(V1)=45 mL

Molarity of Na2S04 after dilution(M2)=x M

Volume of Na2S04(V2)=500 mL

x=M1V1/V2

=1.5X45/500

=0.135 M =1.35 X10-4 M

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A chemical reaction that requires an input of energy in order to proceed is termed Endothermic, whereas one that releases energy is called Exothermic.

The endothermic process is a word used to describe a reaction in which the system takes up heat from its environment. Photosynthesis, evaporating liquids, melting ice, dry ice, alkane cracking, thermal decomposition, ammonium chloride in water, and many more processes are examples of endothermic processes. A reaction that is exothermic is the opposite of one that is endothermic. It emits energy onto its surroundings as heat or light. Examples include neutralization, burning a chemical, fuel reactions, dry ice deposition, respiration, sulphuric acid solution in water, and many more.

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The chemical equations for these reactions are as follows

a. C10H8 + 12 O2 → 10 CO2 + 4 H2O

b. H2S(g) + MnCl2(aq) → MnS(s) + 2 HCl(aq)

c. 3 Mg(s) + N2(g) → Mg3N2(s)

d. 2 OF2(g) → 2 O2(g) + F2(g)

a. Naphthalene is a hydrocarbon with the chemical formula C10H8. When it is heated in the presence of oxygen (air), it undergoes combustion. The reaction produces carbon dioxide (CO2) and water (H2O) as the products. The combustion of naphthalene is an example of a combustion reaction.

b. Chemical reaction takes place when hydrogen sulphide gas (H2S) is bubbled through a manganese(II) chloride (MnCl2) solution dissolved in water. The result of the reaction is a precipitate of hydrochloric acid (HCl) and manganese(II) sulphide (MnS). It is an example of a double displacement or precipitation reaction.

c. Chemical reaction takes place when solid magnesium (Mg) is heated in the presence of nitrogen gas (N2). Solid magnesium nitride (Mg3N2) is the end result of the reaction. It is an example of a synthesis reaction.

d. Heat causes a chemical reaction in oxygen difluoride gas (OF2) that results in the production of oxygen gas (O2) and fluorine gas (F2). The decomposition of oxygen difluoride gas into oxygen and fluorine gases upon heating is an example of a decomposition reaction.

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Answer:

The correct answer is a

A property of water among the given properties It has a relatively high heat capacity. Hence Option (A) is correct

Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to an object to produce a unit change in its temperature.

The SI unit of heat capacity is joule per kelvin. Heat capacity is an extensive property.

Therefore, A property of water among the given properties It has a relatively high heat capacity. Hence Option (A) is correct.

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In order to promote a healthy environment, the piece of trash should be matched to the best method of disposing them as follows:

Compost rotting can be defined as a chemical change that involves the mixture of decayed organic substances such as dead leaves, vegetables, manure, or egg shells, that are added to the soil, in order to fertilize it.

Recycling can be defined as a waste (trash) management technique that involves the process of converting a raw material that has reached the end of its life cycle into new and reusable items.

In order to promote a healthy environment, the piece of trash should be matched to the best method of disposing them as follows:

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Answer:

Recycling - television set, plastic milk bottle, and soup can.

Compost - egg shell, vegetable peel, and grass clippings.

Explanation:

Plato

We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.

Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.

The results of the experiment are shown below:

Fuel            Mass (g)      Heat produced (J)       Heat per gram (J/g)

Methanol 1.0                          350                   350

Ethanol         1.0                          250                   250

Propane         1.0                          200                   200

Butane         1.0                          150                            150

Pentane         1.0                          100                            100

It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.

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Answer:

32.8g/mole

Explanation:

Given parameters:

Mass of sample of gas = 32.8g

Volume  = 22.4L

Unknown:

Molecular weight  = ?

Solution:

To solve this problem we must understand that at rtp;

             1 mole of gas occupies a volume of 22.4L

Number of mole of the gas  = 1 mole

 Now;

   Mass  = number of moles x molecular weight

    molecular weight  = \(\frac{mass}{molecular weight}\)    = \(\frac{32.8g}{1mole }\)      = 32.8g/mole

Answer: C

Explanation: 3 mol O2 ⇒ 2 mol CO2

O2 reacts to produce 5 mol of CO2 = (3 * 5)/2 = 7.5 mol O2

The amount, in kJ, of heat needed to completely vaporize 50.0g of water at 100°C is 118.8 kJ.

The heat needed to completely vaporize 50.0g of water at 100°C can be calculated using the following formula:

q = m x Hv

where:

First, we need to convert 50.0g to moles by dividing by the molar mass of water which is approximately 18.015 g/mol3:

moles of water = 50.0 g / 18.015 g/mol moles of water = 2.776 mol

Thus:

q = (2.776 mol) x (40.65 kJ/mol) q = 112.8 kJ

In other words, 112.8 kJ of heat is needed to completely vaporize 50.0g of water at 100°C.

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Answer:

Porosity of sample = 25%

Explanation:

Given:

Total volume = 400 cubic centimeters  

Pore space volume = 100 cubic centimeters

Find:

Porosity of sample

Computation:

Porosity of sample = [Pore space volume / Total volume]100%

Porosity of sample = [100 / 400]100%

Porosity of sample = [1/4]100%

Porosity of sample = [0.25]100

Porosity of sample = 25%