A busen burner flame is sooty black and mixed with an organige- yellow color. which is the probable reason for this condition?

Sum of squares for the group that didn't get treatment is 228.333. Reporting the answer to two decimal is 228.33.

A decimal is a number that consists of a whole and fractional part. Decimal numbers lie between the integers and represent the numerical value for quantities that are whole plus some part of a whole.

We get the decimals when we break a whole into smaller parts. A decimal number then has the two components: a whole number part and fractional part. The decimal place value system for whole part of a decimal number is the same as the whole number value system. However, we get fractional part of the decimal number as we move toward the right after the decimal point.

Decimals are a set of numbers lying between the integers on a number line. They are just the another way to represent fractions in mathematics. With the help of the decimals, we can write more precise values of measurable quantities like length, weight, distance, money, etc.

The numbers to the left of decimal point are the integers or whole numbers and the numbers to the right of the decimal point are decimal fractions. If we go right from the ones place, the next place will be (1/10) times smaller, which will be (1/10)th or tenth place value.

Sum of squares for the non-treated group = 13700 seconds

                                                                        =[tex]\frac{13700}{60}[/tex]

                                                                        = 228.333 minutes

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The complete question is:

"Assume you are interested in evaluating the effectiveness of a training program designed to decrease the time required to complete a skilled motor task. Seventeen subjects are randomly assigned to one condition or another: Ten subjects are randomly assigned to receive the training program. A second group of 7 subjects receives no training. All subjects then perform the motor task. Test whether training had any effect on the time (in seconds) required to complete the task using a two-tailed t-test (α = .05). Descriptive statistics for the time required to complete the task (in seconds) are presented below for each group.

Trained group                             Non trained group

  X         [tex]X^{2}[/tex]                                         X         [tex]X^{2}[/tex]

  33       1089                                   50         2500

  41         1681                                    46         2116

  38         1444                                   47          2116

   26        676                                    48         2209

  28         784                                    37         1369

   34         1156                                   39          1521

   32         1024                                  41           1681

   30         900

   31           961

   37          1369"

The balanced equation can be written as follows,

[tex]Mn(s)+Cd ^ {2+} (aq)[/tex]→[tex]Mn^{2+} (aq)+Cd(s)[/tex]

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Homolysis is the process of breaking a covalent single bond when, as in the first example, one of the shared pair's electrons is still present with each fragment. Heterolysis is the term for when a bond breaks while still having one fragment and both of the sharing pair's electrons, as in the second and third examples.

How can this result be explained based on bond breaking in bond making that is occurring?

Due to electrical charges and the fact that both water and salt molecules are polar, with positive and negative charges on opposite sides of the molecule, salt dissolves in water at the molecular level.

The chloride ion is negatively charged, while the sodium ion is positively charged, which is why the bonds in salt compounds are referred to as ionic. A water molecule is also ionic in nature, but the link is covalent because two hydrogen atoms place their positive charges on opposite sides of the oxygen atom, which has a negative charge. Water's covalent bonds are more powerful than salt molecules' ionic bonds, so when salt is combined with water, the salt dissolves.

The negatively charged side of the water molecules is drawn to the positively charged sodium ions, whereas the positively charged side is drawn to the negatively charged chloride ions. In essence, a tug-of-war takes place, with the water molecules coming out on top. The ionic link that held sodium and chloride ions together is broken when water molecules force the ions apart. As seen in this picture, the sodium and chloride atoms are encircled by water molecules after the salt compounds are separated. After that, the salt dissolves and forms a homogenous solution.

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The density of the glycerol is 1250g/l.

Density refer to the mass of an object or particles with ratio to its volume.

Density =mass÷volume.

Mass of the object is 3.10^3

volume is 2.50l

Density = 3.10^3÷2.50

Density of the glycerol is 1250g/l

Therefore, The density of the glycerol is 1250g/l

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In a process known as nucleosynthesis, fusion powers stars and creates nearly all elements. As a main-sequence star, the Sun generates its energy through the nuclear fusion of hydrogen nuclei into helium. Each second, the Sun's core fuses 620 million metric tons of hydrogen and produces 616 million metric tons of helium. The fusion of lighter elements in stars has energy and mass that is always present.

Nuclear fusion reactions power the Sun and other stars. A fusion reaction occurs when two light nuclei combine to form a single heavier nucleus. Because the total mass of the resulting single nucleus is less than the mass of the two original nuclei, the process releases energy. The remaining mass is converted into energy.

The occurrence of nuclear fusion in stars causes energy to be released from the core in the form of heat or light, or sometimes another nucleus. According to this, nuclear fission in stars virtually releases all elements.

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Sodium crystallizes in the cubic lattice and the edge of the unit cell is 430pm.

When atoms or molecules are strongly ordered into a structure known as a crystal, the process of crystallization, also known as crystallisation, results in the formation of a solid. Precipitation from a solution, freezing, and—less frequently—direct deposition from a gas are a few of the processes that crystals can go through to develop. When liquid crystals are formed, time of fluid evaporation and variables like temperature and air pressure have a significant impact on the crystal's characteristics.

There are two main stages to crystallization. The first is nucleation, which is the emergence of a crystalline phase from either a supercooled liquid or a supersaturated solvent. The second process, known as crystal growth, results in a crystal state by enlarging the size of the particles.

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Answer:

Hydrogen

Explanation:

The atom only has one proton and one electron making it the first element in the periodic table.

Iodoform reaction is the process of heating a chemical with an alkaline solution of iodine to produce a yellow precipitate. This test yields no results for methyl alcohol.

An alkaline solution is one that contains a soluble base and has a pH value greater than 7. Like NaOH. Additionally, it might be a base and water mixture. Numerous industrial applications exist for alkaline solutions.

Sodium hydroxide, potassium hydroxide, magnesium hydroxide, and calcium carbonate are a few examples of alkaline solutions. There are several uses for each of these solutions in various sectors.

The bottom line is that all you have to do to create an alkaline solution for a straightforward science experiment is mix baking soda and water. Baking soda should be measured. Your solution will get more alkaline as you add more baking soda.

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Chemical energy is a form of potential energy because the energy stored in the chemical bonds can be used to generate work when they are broken down in exothermic reactions.

Chemical energy is a form of potential energy because the bonds of compounds (e.g. foods) may release energy when they are break down during enzymatic reactions, thereby storing potential energy that is transformed into kinetic energy.

In conclusion, chemical energy is a form of potential energy because the energy stored in the chemical bonds can be used to generate work when they are broken down in exothermic reactions.

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Answer

Provide the body with the calories, or energy, to grow as well.

Answer:

The amount of zinc for a given amount are 0.0082 moles.

Explanation:

Answer:

No. of moles = 0.0082

Explanation:

To calculate the number of moles of a substance given its mass, we can use the following formula:

[tex]\boxed{\mathrm{No. \ of \ moles = \frac{Mass}{Molar \ mass}}}[/tex]

The molar mass of zinc is 65 g/mol. The given mass of Zn in this question is 0.535 g. Using this information and the formula above, we can calculate the number of moles of Zn:

No. of moles = [tex]\mathrm{\frac{0.535 \ g}{65 \ g/mol}}[/tex]

                     = 0.0082 mol

Therefore, there are 0.0082 mol Zn in 0.535 g of Zn.

A white precipitate is formed which is soluble in excess of sodium hydroxide.

Sodium hydroxide is primary in nature. It reacts with steel chlorides and forms metal hydroxides as goods. we can stumble on the formed steel hydroxide within the form of a precipitate. by way of including an excess quantity of sodium hydroxide the shaped steel hydroxide precipitate goes too soluble. when an excess of sodium hydroxide is introduced to guide nitrate, sodium plumbite is shaped which gives a colourless solution.

Sodium hydroxide solution seems like a drab liquid. extra dense than water. touch may also severely worsen skin, eyes, and mucous membranes. while lead nitrate solution is reacted with excess sodium hydroxide solution it offers a clean solution via forming lead hydroxide which is colourless in nature. while sodium hydroxide is brought drop sensible till in extra to a solution of zinc sulphate it's far found that white precipitate is shaped that's soluble in excess of sodium hydroxide.

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Ions in solid ionic compounds are not free to move, so they lack electrical conductivity. While liquid compound have excellent electrochemical stability and are inflammable-free.

Ionic liquids differ from solid ionic compounds in their characteristics. They have low melting points, for instance. Low is generally defined as 100 °C or 212 °F (this number may look familiar because it is the boiling point for water, where it turns from a liquid to a gas).

One of the most significant advantages of ionic liquids is their lack of volatility, which results in significantly lower toxicity when compared to low-boiling-point solvents. Because sudden pressure surges are not possible, ionic liquids can also result in safer microwave synthesis techniques.

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Activation energy is defined as the least quantity of extra energy needed by a reacting molecule to get transformed into product.

Activation energy is nearly pertained to its rate.

According to question,

Sodium is might be a generous elements in the earth’s crust layer. It is also a extremely reactive metal, so it doesn’t sway in every direction for very long as free atoms. Since it has a single electron in its outer most shell, which it contributes willingly, Na relate with other reactive elements for the formations of compounds like NaCl and NaOH etc.

Sodium doesn't required any heating to react.

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If a 125 ml erlenmeyer flask weighs 88.5 g, then the volume of erlenmeyer flask in litre is 0.125 litre

Here given data is 125 ml erlenmeyer flask and weighs of erlenmeyer flask  that is 88.5g  

So, in that 125 ml erlenmeyer flask are seen only not the weighs are seen here the weighs of the erlenmeyer flask should not matter here

So, 125ml= 0.125 liters

Here correct answer choices is 0.125 liters

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Piloerection is the reaction most likely to happen if Argus fell into waters around Labrador.

Piloerection is a phenomenon or a reaction causing erection of hairs or papillae of the skin due to the contraction of the tiny arrectores pilorum muscles (tiny muscles located at the origin of each body hair) that elevate the hair follicles above the rest of the skin and moves hair vertically, so hair seems to stand o the end.

When Argus fell into the water of temperature 1°C, or 34°F around Labrador, piloerection happens because Argus might be scared and cold, which makes his hair stand up or cause goosebumps.

Piloerection is a primary physical elicitor kind of response to cold or shock. In Argus and other animals, erection of coat hairs or feathers serves to increase the isolation layer of air around the body.

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As the concentration of carbonate ions is increased, the speed of calcification increases.

Why is carbonate important for ocean life?

Calcium carbonate minerals are the life  blocks for the skeletons and shells of several marine organisms. In areas where most life now congregates within the ocean, the seawater is supersaturated with regard to calcium carbonate minerals.

How do organisms use carbonate?

the most way is via photosynthesis by phytoplankton, where CO2 and sunlight are wont to produce sugars and a waste product of oxygen. carbon are often utilized in the calcium carbonate shells of animals including corals, clams, mussels, oysters.

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Ionic equation is

[tex]Na^{+} _{3} }[/tex](aq) + 2[tex]PO_{4} ^{-3}[/tex](aq) + 3[tex]Mg^{2+}[/tex](aq) + 3[tex]Cl_{2} ^{-}[/tex]-----> [tex]Mg_{3}(PO_{4} )_{2}[/tex]((s) + 3[tex]Na^{+}[/tex](aq) + 3[tex]Cl^{-} _{2}[/tex](aq)

Here the reaction of aqueous magnesium chloride is mixed with aqueous sodium phosphate.

i.e., Mg[tex]Cl_{2}[/tex] react with [tex]Na_{3}PO_{4}[/tex]

Here the reaction is the replacement reaction, so when both magnesium chloride reacts with sodium phosphate it forms magnesium phosphate and sodium chloride.

3Mg[tex]Cl_{2}[/tex] (aq) + 2[tex]Na_{3} PO_{4}[/tex] (aq) ------->  [tex]Mg_{3} (PO_{4} )_{2}[/tex](s) + 6NaCl (aq)

And the ionic equation is:

[tex]Na^{+}_{3} }[/tex] (aq) + 2[tex]PO^{3-} _{4}[/tex] (aq) + 3[tex]Mg^{2+}[/tex](aq) + 3[tex]Cl^{-} _{2}[/tex] (aq)-------> [tex]Mg_{3} (POx_{4} )_{2}[/tex](s) + 3[tex]Na^{+}[/tex](aq) + 3[tex]Cl^{-} _{2}[/tex] (aq)

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Answer:

A 65 + |−5| = 70°, 65° is the farthest from 0°

Explanation:

Answer:

A

Explanation:

This question involves absolute value which makes negative positive

which is farther from 0, 5 or 65?

Try 35% ethyl acetate to see the results, this is because adding more ethyl acetate will increase the polarity and the compounds get easily separated.

In TLC, the polarity between the stationary phase and mobile phase is the basis for mixture separation. In accordance with the "like dissolves like" principle, polar substances can only dissolve in other polar substances, while non-polar substances may only dissolve in other non-polar substances. Consequently, when two compounds with different levels of polarity are present, the more polar molecule interacts with silica more strongly and is therefore better able to displace the mobile phase from the accessible binding sites. The less polar compound thus travels higher up the plate (resulting in a higher Rf value).

However, changing the mobile phase to a more polar solvent or mixture of solvents improves binding to the polar plate and thereby displacing solutes from it, causing all compounds on the TLC plate to rise higher up the plate. It is a prevalent belief that although "weak" eluents hardly move the examined compounds, "strong" eluents drive them up the plate.

Therefore, all compounds move longer and have a larger Rf when a mobile phase is made more polar than it was originally.

Since hexane has a non-polar property while ethyl acetate has a polar property. As a result, adding 35% ethyl acetate will enhance the polarity, making it easier to separate the compounds.

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When 28.5 g of iron shot is added to a graduated cyclinder containing 45.5 ml of water, the water level rises to 49.9 ml. The density of iron would be 7.92 g/ml approax 8 g/ml.

As we already know that density is defined as the mass divided by volume (Mass/ volume).

It is denoted by ρ.

The unit of density is g/ml

Now the Question is

Mass of iron shot = 28.5 g

Density of water at normal = 45.5 ml

Density of water when rises = 49.1 ml

ρ, density = Mass / Volume

= 28.5 g / (49.10 −45.50)mL

= 7.92 g / mL

Approximately 8 g/ml

Hence, the density of iron is 7.92 g/ml approax 8 g/ml.

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The empirical formula of the compound is CH₃N

Mass of C = (12 / 44) × 53

Mass of C = 14.45 mg

Mass of H = (2 / 18) × 32.6

Mass of H = 3.62 mg

Mass of N = (mass of compound) – (mass of C + mass of H)

Mass of N = 35 – (14.45 + 3.62)

Mass of N = 16.93 mg

Divide by their molar mass

C = 14.45 / 12 = 1.204

H = 3.62 / 1 = 3.62

N = 16.93 / 14 = 1.209

Divide by the smallest

C = 1.204 / 1.204 = 1

H = 3.62 / 1.204 = 3

N = 1.209 / 1.204 = 1

Thus, the empirical formula of the compound is CH₃N

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When a base is present, the addition of water to an aldehyde causes the following reaction:

The hydroxide ion functions as a nucleophile in the first phase of the mechanism by being able to donate a single pair of electrons to the carbon atom of the carbonyl bond. Upon addition, an alkoxide is created. Water then protonates the alkoxide, regenerating a hydroxide ion and a primary gem-diol. When two neighboring alkyl groups are linked to a carbon atom, the result is a secondary gem-diol. This would result from the substrate molecule was ketone. When an alcohol and an aldehyde combine to generate a new compound, a hemiacetal is created. This compound has a carbon atom attached to both an ether and hydroxyl group. A carbon atom that is joined to two ether groups and comes from an aldehyde-reacting species is known as an acetal group.

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A sulfide of gold is composed of 6.31g sulfur and 25.93g of gold. Determine the percent of both elements in the compound. 7. Peaches are 8.6% sugar by mass.

A chemical compound is a substance made of numerous similar molecules (or molecular entities), each of which contains atoms from different chemical elements and is bound together by chemical bonds. Since only one element's atoms make up a molecule, it is not a compound. A chemical reaction, which could involve interactions with other molecules, can change one component into another. It's possible for atom-to-atom bonds to break or develop throughout this process.

Depending on how the atoms in the molecule are bound together, there are four main types of compounds. Covalent bonds hold together molecular molecules, while ionic bonds, metallic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds,

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The third test tube has the largest amount of precipitate. The correct ratio for this reaction is 1:1.

Test tubes intended for the general chemical work are usually made of glass, and for its relative resistance to heat. Tubes made from the expansion-resistant glasses, mostly borosilicate glass or fused quartz, can withstand high temperatures up to several hundred degrees Celsius.

Chemistry tubes are available in a multitude of the lengths and widths, typically from 10 to 20 mm wide and 50 to 200 mm long. The top often features a flared lip to aid pouring out contents.

A chemistry test tube typically has flat bottom, a round bottom, or a conical bottom. Some test tubes are made to accept a ground glass stopper or  screw cap. They are often provided with small ground glass or white glaze area near the top for labelling with a pencil.

Test tubes are widely used by the chemists to handle chemicals, especially for qualitative experiments and assays. Their spherical bottom and vertical sides reduce mass loss when pouring, make them easier to wash out, and allow convenient monitoring of contents. The long, narrow neck of the test tube slows down the spreading of gases to the environment.

Test tubes are convenient containers for heating the small amounts of liquids or solids with a Bunsen burner or alcohol burner. The tube is usually held by its neck with clamp or tongs. By tilting tube, the bottom can be heated to hundreds of degrees in the flame, while the neck remains relatively cool, possibly allowing vapors to condense on its walls. A boiling tube is large test tube intended specifically for boiling liquids.

In reaction:

CuSO4 + Na2S ⇒ CuS + Na2SO4

Third test tube had largest amount of precipitate.

In third test tube all Cu2+ ion converted into CuS precipitate.

Test Tube         Ratio

1                          5:1

2                          2:1

3                           1:1

4                           1:2

5                          1:5

so, the correct ratio is 1:1.

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the IUPAC nomenclature  name for ch₃ch₂con(ch₃)ch₂ch₃  for five carbon atoms is 2- METH- BUTANE

The International Union of Pure and Applied Chemistry :

The International Union of Pure and Applied Chemistry (IUPAC) is that the world authority on chemical nomenclature, terminology (including the naming of latest elements in the periodic table), standardized methods for measurement, atomic weights and lots of other critically-evaluated data.

What is the IUPAC naming system?

IUPAC nomenclature is predicated on naming a molecule's longest chain of carbons connected by single bonds, whether during a continuous chain or in a ring. All deviations, either multiple bonds or atoms aside from carbon and hydrogen, are indicated by prefixes or suffixes consistent with a specific set of priorities

What is IUPAC and its function?

The International Union of Pure and Applied Chemistry (IUPAC) is that the world authority on chemical nomenclature and terminology, including the naming of latest elements in the periodic table; on standardized methods for measurement; and on atomic weights, and lots of other critically-evaluated data.

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The tensile modulus of elasticity. The Poisson's ratio of material,. Let. The modulus of elasticity in shear.

Poisson's ratio is a unit of measurement used in solid mechanics and materials science to describe the Poisson effect, which is the deformation (expansion or contraction) of a material in directions opposite the specific direction of loading. The transverse strain to axial strain ratio's value is the opposite of that. is the ratio of transverse elongation to axial compression for minor values of these changes.

The values of Poisson's ratio for the majority of materials fall between 0.0 and 0.5. Poisson's ratio is close to 0.5 for soft materials like rubber because their bulk modulus is significantly larger than their shear modulus. Because open-cell polymer foam cells frequently collapse under compression, Poisson's ratio for these materials is close to zero.

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The -SH is involved in the oxidation and reduction of the amino acid cysteine (sulfhydryl group). By removing two hydrogen atoms, the oxidation of two sulfhydryl groups causes the creation of a disulfide bond.

What is amino acid?

Organic substances known as amino acids have both amino and carboxylic acid functional groups. Although there are hundreds of different amino acids in nature, proteins, which are made up of alpha-amino acids, are by far the most common. In the genetic code, only 22 alpha amino acids are present.

Alpha-, beta-, gamma-, or delta-amino acids can be categorized according to where the main structural functional groups are located; further classifications relate to polarity, ionization, and the type of side chain group (aliphatic, acyclic, aromatic, containing hydroxyl or sulfur, etc.). Amino acid residues are the second-largest component of human muscles and other tissues, behind water, in the form of proteins. Aside from serving as protein residues, amino acids also take involvement in the transfer of neurotransmitters and biosynthesis. They are believed to be essential to the origin of life on Earth and its ability to survive.

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