If the frequency of electromagnetic radiation goes from 6×10¹⁴Hz to 3×10¹⁴Hz, the energy of each individual photon in the radiation
is divided by 2

Answer:D

Explanation:

Answer:

Given metal is iron

Explanation:

Given data:

Heat absorbed = 790.24 J

Initial temperature = 40.0 °C

Final temperature = 72.0 °C

Mass of metal = 55.0 g

Identity of metal = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 72.0°C - 40.0°C

ΔT =  32 °C

790.24 J = 55 g ×c ×  32 °C

790.24 J = 1760 g. °C  ×c

c = 790.24 J /1760 g. °C

c = 0.449 J/g. °C

The specific heat capacity of iron is 0.449 J/g. °C thus, given metal is iron.

Bar graph is the best type of graph to use if you are trying to compare quantities for four separate options that are not related to the dependent or independent variables and that are not measured over time.

Bar graphs are the type of graph that can be used when the data measurement between different variable are not continuous or not measured over time.

The advantages of bar graphs include the following:

Therefore, Bar graph is the best type of graph to use if you are trying to compare quantities for four separate options that are not related to the dependent or independent variables and that are not measured over time.

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Answer:

hope you like it

Explanation:

No, your refreshing glass of water won't spontaneously combust. Water is made up of two elements, hydrogen and oxygen. Hydrogen is flammable, but oxygen is not. ... You can, however, break it down into hydrogen and oxygen by putting energy into it, in the form of an electric current.

Answer:

Independent variable: AMOUNT OF SUNLIGHT

Dependent variable: HEIGHT OF PLANTS

Experimental group: PLANTS KEPT UNDER BRIGHT SUN LAMPS ALL NIGHT

Control group: PLANTS THAT RECEIVED NORMAL AMOUNT OF SUNLIGHT

Explanation:

Independent variable refers to the variable that is manipulated or changed in an experiment in order to effect a measurable response. In this case, the independent variable is the VARYING AMOUNT OF SUNLIGHT.

Dependent variable is the variable that the experimenter measures or the variable that responds to changes made to independent variable. The dependent variable in this case is the HEIGHT OF PLANTS measured.

Experimental group is the group in an experiment that receives the experimental treatment. In this case, the PLANTS KEPT UNDER BRIGHT SUN LAMPS ALL NIGHT is the experimental group.

Control group is the group that does not receive any experimental treatment/independent variable. In this case, the PLANTS THAT RECEIVED NORMAL AMOUNT OF SUNLIGHT is the control group.

Explanation:

Hydrogen is a very special element of the periodic table and doesn't belong to any family. While hydrogen sits in Group I, it is NOT an alkali metal.

When a very high amount of reducing sugar is present in a sample, Benedict's solution will react by forming a brick-red precipitate. The answer is B. Brick-red precipitate is formed.  

The presence of this precipitate indicates a positive result for the test and indicates that the sample contains a significant amount of reducing sugar. This reaction is an example of an oxidation-reduction reaction in which the reducing sugar is oxidized and the Benedict's solution is reduced.

The reaction is as follows:

Reducing Sugar + Benedict's Solution → Brick-red Precipitate + Oxidized Benedict's Solution

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Each N atom in the purine heterocycle of DNA (deoxyribonucleic acid) is hybridized in the sp² configuration.

This means that each N atom has three sp² hybrid orbitals and one p orbital. The sp² hybrid orbitals are used to form sigma bonds with other atoms in the purine heterocycle, while the p orbital is used to form a pi bond with another p orbital from a neighboring atom.

This arrangement allows for the formation of a stable, planar structure that is essential for the proper functioning of DNA.

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Answer:

B.

Explanation:

Answer:

B.

email her superviser so that he can respond to the sender's question.

The number of the molecules of water is 1.8 g is  6.02 * 10^22 molecules.

We can be able to obtain the molecules from the Avogadro's number. We know that the number of the molecules that we find in the compound can be gotten by the use of the proposition that was put forward by Avogadro.

Number of moles of the water = 1.8g/18 g/mol = 0.1 moles

We know that;

1 mole of water contains 6.02 * 10^23 molecules of water

0.1 moles of water would contain 0.1 mole * 6.02 * 10^23 molecules/ 1 mole

= 6.02 * 10^22 molecules

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Aqueous potassium permanganate that has been diluted with carbon tetrachloride with bromine. Pentane and 1-pentane are distinguished by reagents.

An unsaturation test can be performed using the bromine in carbon tetrachloride solution. Use 100 ml of carbon tetrachloride and bromine to evaluate the unsaturation of a compound when it is insoluble in water. The bromine water turns gray as a result of how the bromine reacts with an alkene's carbon-carbon double bonds. With the help of bromine, an alkene is transformed into an alkane by breaking the carbon-carbon bond.

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Answer:

1440

Explanation:

32 cans/bundle and there are 45 bundles 32 x 45 = 1440

If you fill 12 trays with water and find the total water mass to be 500 g, the quickest way to figure out the mass of water in one of the trays would be to divide the total mass of water by 12.

Since the total mass of water in the 12 trays = 500 g

Mass of water in a single tray would be = 500/12

                                                               = 41.67 rounded to 2 decimal places.

This represents the quickest way because direct weighing will require a few steps and, thus, takes more time.

For direct weighing:

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Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Answer:

Option A is definitely the correct answer.

Explanation:

from my analysis

( Just fill those words into each dash or empty space accordingly as you saw it )

Good luck

Answer: They are both non polar molecules compounds although water is a polar molecule compound. There are no significant attractions.

The pH at the beginning of the titration is 5.03, and the pH at the equivalence point is 1.66.

Volume of pyridine solution (C5H5N) = 25.0 mL

Concentration of pyridine solution (C5H5N) = 0.240 M

Concentration of HBr solution = 0.240 M

pKa of pyridine (B of pyridine) = 1.7 × 10^(-9)

Step 1: Calculation at the beginning of the titration

The initial concentration of pyridine (C5H5N) is 0.240 M, and since pyridine is a weak base, we can use the Henderson-Hasselbalch equation to calculate the pH at the beginning of the titration:

pH = pKa + log([A-]/[HA])

pH = pKa + log([C5H5N]/[HBr])

pH = -log10(1.7 × 10^(-9)) + log10(0.240/0.240)

pH ≈ 5.03

Therefore, the pH at the beginning of the titration is approximately 5.03.

Step 2: Calculation at the equivalence point

At the equivalence point, the moles of HBr added will be equal to the moles of pyridine present initially.

Moles of pyridine (C5H5N) = Volume (in liters) × Concentration

Moles of pyridine = 25.0 mL × (0.240 mol/L) = 6.0 × 10^(-3) mol

Since the moles of HBr added is equal to the moles of pyridine, the concentration of HBr at the equivalence point will be:

Concentration of HBr at equivalence point = Moles of HBr / Volume (in liters)

Concentration of HBr = (6.0 × 10^(-3) mol) / (25.0 mL) = 0.240 M

At the equivalence point, the pyridine has been completely neutralized, and the resulting solution is a strong acid (HBr). The pH of a 0.240 M HBr solution can be directly calculated

pH = -log10(0.240)

pH ≈ 1.66

Therefore, the pH at the equivalence point is approximately 1.66.

The pH at the beginning of the titration is 5.03, and the pH at the equivalence point is 1.66.

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Homologous series: Homologous series is the series in which the functional group of any compound and their chemical properties are similar, the difference between any two successive members is same.

Above homologous series is of Alkanol

\( \tiny\sf \: general \: formula \: for \: Alkanol \rightarrow C_nH_{2n+2}O\)

Above homologous series is differed by methylene (-CH2-) group. hence the mass diffrence between them would be the mass of -CH2- group.

\( \small \sf \: CH_2 = = 12+1+1 = 14 \: a.m.u. \\ \hline\)

The compound X is next to CH3CH2OH hence, X will have molecular formula CH3CH2CH2OH which is obtained by addition of a methylene group.

\(\tiny\: the \: compound \: x \: (n = 3) \: have \: general formula =C_3H_{8}O \\ \small \sf \: The \: molecular \: mass \: of \: X =3 \times 12 + 8 \times 1 + 16 \\ \sf = 60 \: a.m.u\)

The reason behind the highest boiling point of butanol is his molecular mass, the main reason is the surface area, as the molecular mass increases surface area also increases which lead to increase in the vanderwall forces, due to which boiling point of compound increases. the same compound having least solubility is due to lyophilic/Hydrophobic ( tendency to get dissolved in non aqueous solution) increases & solubility of compound in polar solvents decreases.

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Answer: There are 2.161 x 10^24 molecules present in 3.6 moles CH₁.

Explanation:

Molecules are the the lowest fundamental unit of a chemical molecule that can participate in a chemical reaction is a group of bound atoms. Avogadro's number is used to calculate the number of molecules present in a mole of a substance

Avogadro's number of particles, or around 6.022 x 1023 molecules, are present in one mole of any substance. Therefore the following would be present in 3.6 moles of CH1:

2.161 x 1024 particles are equal to 3.6 moles times 6.022 x 1023 particles per mole.

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Gasoline blending in petroleum refineries involves analyzing the properties of different components and determining the optimal mixing ratios to produce gasoline that meets specific octane rating and quality requirements.

Gasoline blending is a critical process in petroleum refineries where different components are combined to produce the desired gasoline product. In this example, the challenge is to blend gasoline from three different components.

To solve the gasoline blending problem, various factors need to be considered such as the desired octane rating, volatility, and environmental regulations. The first step is to determine the optimal proportion of each component based on their individual characteristics. This involves analyzing the properties of each component, such as its research octane number (RON), motor octane number (MON), and vapor pressure.

The second step is to develop a blending strategy that achieves the desired gasoline specifications. This involves determining the appropriate mixing ratios of the three components to meet the target octane rating and other quality requirements. The blending process requires precise calculations and adjustments to ensure the final gasoline product meets the desired specifications.

Additionally, economic considerations play a role in gasoline blending. The cost of each component and the market demand for specific gasoline grades can influence the blending decisions. Refineries aim to optimize the blend to minimize costs while meeting quality standards.

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0.9 moles of aluminum will be used when reacted with 1.35 moles of oxygen based on this chemical reaction.

In chemistry, a mole, usually spelt mol, is a common scientific measurement unit for significant amounts of very small objects like molecules, atoms, or other predetermined particles. The mole designates 6.02214076 1023 units, which is a very large number.

For the Worldwide System of Units (SI), the mole is defined as this number as of May 20, 2019, according to the General Convention on Measurements and Weights. The total amount of atoms discovered through experimentation to be present in 12 grammes of carbon-12 was originally used to define the mole.

4Al + 6O\(_2\) → 2Al\(_2\)O\(_3\)

moles of oxygen =  1.35 moles

moles of al = (4/6)×  1.35 =0.9 moles

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Answer:

It’s actually 130 degrees Celsius.

Explanation:

Answer:

Explanation:

Using Charles's Law to solve this question: V1/T1 = V2/T2

V1 = 2.24L

T1 = 52C (covert to Kelvin by plus 273.15) = 325.15K

V2 = 1.66L

T2 = ?

V1/T1 = V2/T2 must change to V2×T1/V1 = T2

1.66 x 325.15/2.24 = V2

V2 = 240.96K ≈ 241K

Explanation:

{c}^C . {d}^D / {a}^A . {b}^B

Answer:

just see if i am not wrong

learning balancing in chemistry it take time

hope i am correct

If the acid was actually 0.045 M, a. The correct molar solubility is 0.0448 M. b. The student's percent error is 2.86%.

a. The molar solubility of a compound is the concentration of the compound in a saturated solution at equilibrium with the solid phase. The molar solubility of a slightly soluble salt can be determined by using the solubility product constant (Ksp) and the stoichiometry of the dissolution reaction.

In this case, the molar solubility of a compound was calculated using an incorrect concentration of the HCl. The correct molar solubility can be calculated by using the actual concentration of the HCl.

The solubility product constant for the compound can be calculated using the molar solubility and the balanced equation for the dissolution of the compound.

The balanced equation for the dissolution of the compound is:

Compound(s) ⇌ cation(aq) + anion(aq)

The Ksp expression is:

Ksp = [cation][anion]

The concentration of the cation and anion can be assumed to be equal to the molar solubility since the compound is a 1:1 electrolyte.

Therefore, Ksp = (molar solubility)²

Using the given value of the Ksp and the correct concentration of the HCl, the correct molar solubility can be calculated.

molar solubility = √(Ksp / [HCl])

molar solubility = √(1.2 x 10⁻⁸ / 0.045) = 0.0448 M

b. The percent error can be calculated using the following formula:

% error = |(experimental value - actual value) / actual value| x 100

% error = |(0.0112 - 0.0448) / 0.0448| x 100 = 2.86%

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The fact that the colorless gas hydrogen reacts explosively when ignited in air is a chemical property. A chemical property is a characteristic of a substance that describes its ability to undergo a chemical change or reaction. In this case, hydrogen reacts with oxygen in the air to form water vapor, which is accompanied by an explosive release of energy.

When hydrogen is ignited, the chemical reaction between hydrogen and oxygen takes place, resulting in the formation of water vapor. This reaction is known as combustion. The release of energy in the form of an explosion is a clear indication of a chemical change occurring. Physical properties, on the other hand, describe the characteristics of a substance that can be observed without changing the chemical composition of the substance.

In summary, the ability of hydrogen to react explosively when ignited in air is a chemical property, as it involves a chemical change and the formation of a new substance (water vapor).

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\(\huge\fcolorbox{red}{pink}{Answer ♥}\)

The carbon atom is unique among elements in its tendency to form extensive networks of covalent bonds not only with other elements but also with itself. ... Moreover, of all the elements in the second row, carbon has the maximum number of outer shell electrons (four) capable of forming covalent bonds.

Hope it helps uh ✌️✌️✌️

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