Calcium carbide, CaC2, is manufactured by reducing lime with carbon at high temperature. (The carbide is used in turn to make acetylene, an industrially important organic chemical.) CaO(s)+3C(s)→CaC2(s)+CO(g) ΔH=464.8kJ Calculate the quantity of energy, in MJ, transferred when a metric ton(1000 kg) of CaC2(s) is manufactured. Ca = 40 g/mol C = 12 g/mol O = 16 g/mol

The correct answer is 14.8%.

The given reaction,

C_6H_12O_6 ----> 2CO₂ + 2C₂H₂OH

A key idea in chemistry is stoichiometry, which determines the quantity of reactants or products in a chemical reaction and aids in understanding different reactions and the proportions in which they might take place. A combination of two Greek terms is stoichiometry. Stoicheion, which denotes an element, and metron, which denotes a unit of measurement

mole= mass/mole mass

=90g/180g/mol

=0.5mol

According to stoichiometry

1 mol glucose = 2 mol ethanol

0.5 mol C_6H_12O_6 = 1 mole ethanol

mass of ethanol = 1 mole ×46 g/ mol

Theoretical yield = 46 g

percentage = actual yield / theoretical yield × 100

=6.8 g / 46 g × 100 = 14.78% =14.8%

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Answer:

Explanation:

All of the following are duties of United States citizens EXCEPT:

A.

understanding their rights

B.

taking education seriously

C.

understanding what it means to be an active citizen

D.

learning about and understanding foreign governments and laws

Please select the best answer from the choices provided

A

B

C

D

Answer:

The kilogram, meter, and second are the fundamental base units upon which the metric system is built, but seven units of measure are defined from which all the other units are derived: Kilogram: The kilogram (kg) is the base unit of mass. Meter or Metre: The meter (m) is the unit of length or distance.

Explanation:

The two main sets of English units were the Winchester Units, used from 1495 to 1587, as affirmed by King Henry VII, and the Exchequer Standards, in use from 1588 to 1825, as defined by Queen Elizabeth I.

Suppose that the gene for a protein 500 amino acids in length undergoes a mutation. If the mutation causes the synthesis of a mutant protein in which just one of the 500 amino acids is incorrect.

The mutation is a condition in which there are changes in the DNA and gene. These changes are due to genetic mutation and other bio factors and radiation.

The protein may be folded incorrectly. And the protein will not attain its old structure. Because denature is an irreversible process and does not get the structure of its before.

Thus, the statement is incorrect.

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The web's connectivity advantage allows for data and resource sharing that enables communication with a website.

In our daily lives, communication helps us build relationships by allowing us to share experiences and needs and connect with others. It is the essence of life that allows us to share We all need to communicate.

In our daily lives, communication helps us build relationships by allowing us to share experiences and needs and connect with others. It is the essence of life that can be shared. We all need to communicate. Effective communication results in a sense of satisfaction and accomplishment for all involved. Clearly communicating your message leaves no room for misunderstandings or message changes, and reduces the chance of conflicts.

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Answer: because acid and water react in a vigorous exothermic reaction, releasing heat, sometimes boiling the liquid.

Most americans overconsume calcium. fiber. added sugars. potassium because in calcium, fiber added sugars, potassium has an healthy and nutrition food and it does't cause diseases.

Adequate intake of calcium is necessary for bone health as well as for basic biological functions such as nerve transmission, vasoconstriction, vasodilation, and muscle contraction. adequate potassium intakes are associated with optimal blood pressure and may reduce the risk of developing kidney stones and bone loss. fiber may protect against cardiovascular disease, obesity, and type 2 diabetes, and it is essential for digestive health. that's why most american's overtake this calcium, fiber added sugars, potassium

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The following question follows the law of conservation of mass.

The law of conservation of mass states that in a reaction the mass of the products is equal to the mass of the reactants.

The reaction is :

Pb(NO₃)₂(aq) + K₂CrO₄(aq) → PbCrO₄(s) + 2KNO₃(aq)

the mass of beaker A containing lead nitrate = 128.71g

the mass of beaker B containing potassium chromate = 128.97g

After mixing beaker A and B,

mass of beaker A = 154.10g

mass of beaker B = 103.58g

Thus, according to law of conservation of mass,

mass of reactants =  128.71 + 128.97 = 257.68g

mass of products = 154.10 + 103.58 = 257.68g

hence, mass of products = mass of reactants.

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The change in the internal energy of the gas is 1.5×10∧3 J.

The internal energy of an ideal gas is directly proportional to the temperature of the gas:

ΔE = 3/2 × n × R × ΔT

ΔT = 320 K - 260 K

ΔT = 60 K; change of the temperature

n = 2.0 mol: amount of a monatomic ideal gas

R = 8.1 J/mol×K;the ideal gas constant

ΔE = 3/2 × 2 mol × 8.1 J/mol×K × 60 K

ΔE = 1500 J

ΔE = 1.5×10∧3 J;  the internal energy of the gas

Isobaric process is a type of process in which the pressure of the system stays constant.

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Yes , the chemist can answer if the compound in K2O or K2O2

The chemical formula and composition of both the compounds is entirely different. The compound K2O2 has an additional molecule of oxygen than K2O and hence will have have higher molecular mass.

In the compound K2O

molecular mass= 2x 39+16 =94

mass ratio of K in compound= 78/94 = 0.830

In the compound K2O2

molecular mass= 2x 39+16X2 =110

mass ratio of K in compound= 78/110 = 0.710

and hence by the required ratio while extracting K , the chemist may know if the compound is K20 or K2O2

If the ratio is anything different from 0.830 and 0.710 then the compund will be something different

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You are given the sodium acetate, hcl (1 m), nahco3, and nahco3 we need na2co3

Here pKa Co=310.3⁴  buffer of pH =9.9

Use nahco3, and na2co3 to prepare 100mL of buffer with 0.1M of concentration here we calculate the given salt,

pH=pKa+log[salt]/[acid]  9.9=10.1+log[na2co3]/[nahco3][na2co3]/[nahco3] = 0.63

[na2co3]+[nahco3]=0.1M

0,63[nahco3]+[nahco3]=0.1 [nahco3]=0.0613M

Moles=molarity×volume=0,0613×100/1000=0.0613moles

[na2co3]=0.1-0.0613=0.938M

Moles=0.938M

Calculated moles will be prepared in buffer in 100 ml solution

Moles=mass/molecular weight

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Conevrting 1.9 kilojoule(kJ) into:

a) 1.9 kJ = 450 cal

b) 1.9 kJ = 1900 J

Similar to how kilometers measure distance, a kilojoule is a unit used to measure energy. Some nations continue to utilize the Calories (Cal) system, which was once used to quantify food energy. These are the conversions: 1 kJ = 0.2 Cal.

A calorie is a unit of energy measurement. Typically, the energy content of meals and beverages is determined in terms of calories. You must consume fewer calories each day than your body uses up in order to lose weight. Calories are necessary for human survival. Without energy, the body's cells would die, the heart and lungs would stop pumping, and the organs wouldn't be able to carry out essential life tasks. Through their consumption of food and liquids, people can absorb this energy.

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Answer:

An atom is the smallest particle of an element and is the building block of all matter.

If this molecule of dna originated as a linear molecule with a linking number (l) of 30, which was then circularized and unwound, the l for the unwound circular molecule would be 28.

As unwound circular DNA would result in a reduction of 2 linking numbers, the answer should be 28, since the linking number is constant for a closed supercoiled DNA molecule.

30 - 2 = 28

Nucleotide molecules are the building blocks of DNA. Each nucleotide consists of three parts: a sugar molecule, a nitrogen base, and a phosphate group, which is made up of one phosphorus atom bound to four oxygen atoms. The "letters" that make up the genetic code of our DNA are adenine (A), thymine (T), guanine (G), and cytosine (C), which are the four different types of nitrogen bases.

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Answer:

Thomson used creativity to interpret the results of the cathode ray tube experiment. Explain how the atomic theory was modified from Dalton's theory to Rutherford's.

The houses of compounds are one-of-a-kind and in a few instances very one-of-a-kind, from the ones of the factors that compose them. This is because Elements combine compounds to grow to be absolutely one-of-a-kind materials with specific houses.

Elements combine may be chemically blended into compounds, therefore, a compound includes extra factors blended, in exact proportions, with the aid of using chemical means. Compounds can be shaped with the aid of using combining atoms in their constituent factors with the aid of using ionic bonds or with the aid of using covalent bonds.

An Elements compound is a completely unique substance that paperwork while or extra factors integrate chemically. A compound usually includes the identical factors withinside the identical ratio. If the identical factors integrate into one-of-a-kind ratios, they shape one-of-a-kind compounds. Types of compounds encompass covalent and ionic compounds.

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Answer:

I’m not sure! Bacteria are kind of disgusting, but some of them might be helpful.

Explanation:

My opinion since I didn't get to read the article :)

The given number is can be written in standard form as 1 times 10 to power negative 10 ( 1 x 10⁻¹⁰).

A standard form is a form of writing a given mathematical concept like an equation, number, or an expression in a form that follows certain rules.

The given number =  1.0 x 10^-10

The given figures can be written in standard form as follows;

1.0 x 10^-10 = 1 x 10⁻¹⁰

Thus, the given number is can be written in standard form as 1 times 10 to power negative 10 ( 1 x 10⁻¹⁰).

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When drawing conclusions from the data in a scientific claim , the person making the claim should be trained in that field in which he or she is making claim.

Claim made by scientists in there research or theory is known as Scientific claim. It is based generally on evidences and systematic observation . These claims should be supported by proofs and pre existing theories so that this can be relied on.

But every scientific claim is not true and thus is non reliable because of faults and flaws made during the experiment  and investigation .

Therefore to make a claim reliable , the person making the claim should have abundance knowledge of it and have done sufficient background search of the topic on which he or she is making the claim. Also he or she should be trained in the field in which they are making the claim then only the claim can be trusted and the theories and conclusion can be made out of it.

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Dilute 500 ml of 0.5 m kcl to a final volume of 3.5l resulting molarity is 0.1428

Molarity is the amount of a substance in a certain volume of solution. molarity is also defined as the moles of a solute per liters of a solution. molarity is calculated as M = no of moles of solute/volume of solution in liter

here, kcl is diluted as 0.5m and final volume is 3.5l so,

M = 0.5/3.5 = 0.1428

So molarity is 0.1428

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Yellow paint has 0.511 % PbCrO4 by mass

Mass of PbCrO4 in 1 kg of paint = (0.511 / 100) * 1 kg = 0.00511 kg = 5.11 g

Moles of PbCrO4 = 5.11 g/ 323.19 g/mol

                           = 0.0158 moles

Moles of K2CrO4 also = 0.0158 moles

Moles of FeCr2O4 = 0.0158 moles K2CrO4 * (4 mole FeCr2O4 / 8 moles K2CrO4)

                            = 0.0079 moles

Mass of FeCr2O4 (chromite) = 0.0079 moles * 223.83 g/mol

                                            = 1.77 g

Paints are divided into two types: oil-based paints and water-based paints. Oil paints are usually used as a primer, undercoat, and topcoat. In the past, we relied heavily on oil-based paints for surface durability and longevity, but today water-based paints are on par. It is used for prolongation and acts as a barrier against environmental influences. Paint consists of pigments, solvents, resins, and various additives. Pigments give the paint its color. Solvents make application easier. The resin helps dry. Additives range from fillers to antifungals. There are hundreds of different natural and synthetic pigments.

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Answer:

H2S

Explanation:

The gas with the smallest molar mass diffuses the fastest (assuming that the holes are the same size and that gasses act ideally).
Find the molar mass of each of the gasses, and then compare.
CO2 = 12 + 16 + 16 = 32 + 12 = 44
HCl = 35.45 + 1 = 36.45
H2S = 1 + 1 + 32 = 34
NO2 = 14 + 16 + 16 =  32 + 14 = 46
Therefor, H2S diffuses the fastest, then HCl, then CO2, and finally NO2

Covalent bonds predicted from an atom of Silicon (Si) are Four covalent bonds.

Covalent bonds are generally formed by the non-metals. These bonds are formed when electrons are shared between the atoms. To know the number of covalent bonds in any atom, you must know the number of valence electrons.

Those elements which belong to the period 2 forms covalent bond as-

                                  8 - number of valence electrons.

Those elements which are from period 3, they form covalent bonds exactly same as the number of valence electrons.This is because d-orbitals are present in the period.

Silicon is the 14th element which belong to period 3. The electronic configuration of 1s² 2s² 2p⁶ 3s² 3p²

Just like Carbon (C), Silicon (Si) is tetravalent in nature, which means that it can easily share all four of its valence electrons and form covalent bonds. To become stable, Silicon(Si) will form four covalent bonds.

Silicon has four valence electrons, so it will form four covalent bonds.

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Volume of Iron is therefore 7.8g/cm^3

The formula for [tex]density(\rho) = \frac{Mass(m)}{Volume(v)}[/tex]

m = 7.3g

v = 24.83ml - 23.90ml = 0.93ml

Since 1ml = 1cm^3, the new volume = 0.93/cm^3

Using the formula [tex]\\ density(\rho) = \frac{7.3g}{0.93cm^{3} } = 7.8g/cm^{3}[/tex]

Volume is a measure of occupied third-dimensional space. It is frequently quantified numerically the use of SI derived gadgets (such as the cubic meter and liter) or through a number imperial units (such as the gallon, quart, cubic inch). The definition of size (cubed) is interrelated with volume. The volume of a container is typically understood to be the capability of the container; i.e., the amount of fluid (gas or liquid) that the container may want to hold, as a substitute than the quantity of space the container itself displaces.

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In a phospholipid, the end of the molecule likely to face towards a nonpolar environment is end with fatty acid chain.

Phospholipids are a group of polar lipids that consist of two fatty acids, a glycerol unit and a phosphate group which is esterified to an organic molecule such as choline, ethanolamine, inositol etc. phospholipids are composed of a phosphate group, two alcohols, and one or two fatty acids. on one end of the molecule are the phosphate group and one alcohol this end is polar, i.e. has an electric charge, and is attracted to water means hydrophilic. the other end, which consists of the fatty acids, is neutral it is hydrophobic and water insoluble.

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Approximately, 21 kJ was released from the combustion of the 1-g sample.

Because heat is a type of energy, the SI unit for heat is also joules (J), which is defined as the quantity of energy required to increase the temperature of a given mass by one degree. This is significant because heat is a form of energy. Heat is the result of the movement of kinetic energy within a material or an item, or from an energy source to a material or an object. Radiation, conduction, and convection are the three mechanisms through which such energy can be transferred. The joule is the S.I. unit for heat.

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The type polymer would you obtain if sorbitol was used as a plasticizer additive is the  Bio - polymer.

Plasticizers are the substances added to polymer soultion to enhances its flexibility and plasticity. This is the reason plasticizers make polymer solution suitable for the application of film coating.

Bio - polymers are produced from natural sources. Bio based polymer may produced from sugar- based or starch based.

Sorbitol is a naturally occuring sugar alcohol. it is the effective plasticizer for improving melt processing ability.sorbitol is a type of carbohydrate  known as sugar alcohol or polyol. It is found in sugar free gum used as a plasticizers and reduce the hydrogen bonding of polymer and incorporate spaces into the polymer.

so, when sorbitol used as plasticizer additive the type of polymer formed is bio - polymer.

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The energy for the phosphorylation of ADP by ATP synthase is powered directly by H+ concentration across the membrane holding ATP synthase.

Phosphorylation: A biochemical process involving the addition of phosphate to an organic compound. Examples include the addition of phosphate to glucose to produce glucose monophosphate and the addition of phosphate to adenosine diphosphate (ADP) to form adenosine triphosphate (ATP).

Phosphorylation plays an important role in the regulation of many cellular processes including cell cycle, growth, apoptosis, and signaling pathways. Phosphorylation is the most common mechanism used to regulate protein function and transmit signals throughout the cell. Glucose phosphorylation maintains the downward gradient of glucose metabolism and extramitochondrial glucose flux via the pentose phosphate pathway. Induction of the pentose phosphate pathway and generation of NADPH may also help prevent cell death.

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Answer:

2.640

Explanation:

Rounding to the nearest whole number would be 3 if that is needed.

Mass of water is 11.52 grams.

Overall chemical equation for reaction of combustion a compound containing only carbon and hydrogen:

CxHy + O₂ → xCO₂ + y/2H₂O

m(CxHy) = 7.02 g; mass of the compound

m(O₂) = 25.5 g; mass of oxygen

m(CO₂) = 21.0 g; mass of carbon dioxide

m(H₂O) = ?; mass of water

Conservation of matter states that the mass of the reactants have to be equal to the mass of the products.

m(CxHy) + m(O₂) = m(CO₂) + m(H₂O)

7.02 g + 25.5 g = 21.0 g + m(H₂O)

m(H₂O) = 32.52 g - 21.0 g

m(H₂O) = 11.52 g; mass of water

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