why is getting a new haircut considered as physical change?

There are 20 positions with the amino acids the same between the two species. Those are 6, 7, 9, 11, 12, 14, 16, 18, 19, 23, 28, 30, 36, 37, 38, 47, 50, 51, 53, and 54.

Amino acids are defined as the molecules that combine to form proteins. Amino acids said as the building blocks of life. The human body uses amino acids to make proteins to help the body to break down the food. There are 12 amino acids. Those are isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine, cysteine, tyrosine, histidine and arginine. These are the organic compounds which contain both amino and carboxylic acid functional groups. There are 20 positions with the amino acids of same species.

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The complete question is,

How many positions are the amino acids the same between the two species?

Calcium ion created by the calcium atom losing two electrons has 18 electrons.

A neutral calcium atom has 20 electrons. When it loses two electrons, it becomes a calcium ion with a +2 charge. Since electrons have a negative charge, a calcium ion with a +2 charge will have 2 fewer electrons than a neutral calcium atom.

The calcium ion is a positively charged ion that has lost two electrons from the neutral calcium atom. It has a 2+ charge and is represented as Ca2+. The electronic configuration of the calcium ion is 1s² 2s² 2p⁶ 3s² 3p⁶, which means it has a total of 18 electrons. Thus, a calcium ion with a +2 charge will have 18 electrons.

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Answer:

C. The dissolving reaction of A was exothermic and the dissolving of reaction B was endothermic

Explanation:

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Looking at the solubility curve above for KClO3, at 30 degrees Celsius 37grams will dissolve to make a saturated solution.

Saturated and unsaturated solutions: what are they?

A saturated solution is one that has as much of the solute present as is capable of dissolving. A solution is said to be unsaturated if it doesn't contain all of the solute that can disperse in it.

A depiction of solubility (measured in g/100 g water) versus temperature (measured in °C) is known as a solubility curve. On the same graph, solubility curves for various substances are frequently depicted, allowing for easy comparisons. The curved line on the graph that depicts the connection between temperature and a substance's solubility at various temperatures is known as the solubility curve.

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Answer:

5

Explanation:

An ion has a net charge of 3+

ion has 8 protons

How many electrons does it have

A neutral atom has equal number of electrons and protons.

If a neutral atom loses electron it acquires a positive charge.

So to acquire 3+ charge the atom must have lost three electrons.

So the number of protons exceeds the number of electrons by 3.

To calculate the number of millimoles of phenyl bromide present, we need to first convert the given quantity of phenyl bromide (1.4555 g) into moles by dividing it by its molar mass.

The molar mass of phenyl bromide is the sum of the molar masses of its constituent atoms, which is 157.01 g/mol.

Therefore, the number of moles of phenyl bromide present is:

1.4555 g / 157.01 g/mol = 0.0092711 mol

To convert this into millimoles, we need to multiply it by 1000:

0.0092711 mol x 1000 = 9.2711 mmol

Therefore, there are 9.2711 millimoles of phenyl bromide present in the Grignard reaction. It is important to accurately measure the amount of reactants involved in a reaction to determine the stoichiometry and yield of the reaction.

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Burning natural gas on a stove is an exothermic process.

When natural gas (CH₄) is burned on a stove, it undergoes a chemical reaction with oxygen (O₂) in the air. This combustion reaction releases energy in the form of heat and light, making it an exothermic process.

The combustion of natural gas can be represented by the following balanced chemical equation:

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)

In this reaction, methane (CH₄) reacts with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O). The breaking of the carbon-hydrogen and carbon-oxygen bonds in methane and the formation of new carbon-oxygen and hydrogen-oxygen bonds in carbon dioxide and water release energy.

The release of energy in the form of heat is what makes the burning of natural gas on a stove exothermic. This heat energy can be used for cooking or heating purposes.

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The burning of natural gas on a stove is an exothermic reaction.

When natural gas burns on a stove, it undergoes a combustion reaction. Combustion reactions involve the reaction of a fuel (in this case, natural gas) with oxygen to produce carbon dioxide and water vapor. These reactions are typically exothermic, meaning they release heat energy into the surroundings.

In the case of natural gas burning on a stove, the heat energy released is what allows the stove to generate heat and cook food. The combustion of natural gas is a highly exothermic process, which is why it is commonly used as a fuel source for heating and cooking.

It is important to note that the exothermic nature of the reaction can be influenced by other factors such as the presence of a catalyst or the availability of oxygen. However, in the context of a typical stove burner, the burning of natural gas is considered an exothermic reaction.

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Answer:

10.81 amu

Explanation:

The average atomic mass of Boron can be calculated as follows :

\(A=19.9\%\ \text{of}\ 10.01294 +80.1\%\ \text{of}\ 11.00931\\\\A=\dfrac{19.9}{100}\times 10.01294 +\dfrac{80.1}{100}\times 11.00931\\\\A=10.81\ \text{amu}\)

So, the average atomic mass of boron is 10.81 amu.

Lithium dichromate - Li2Cr2O7

The correct option is (d) Oxidation, Reduction.

NAD+ + 2H -> NADH is an oxidation reaction and FADH2 -> FAD + 2H is a reduction reaction.

An oxidation reaction is a type of chemical reaction where electrons are transferred from one molecule, atom, or ion to another. Specifically, in an oxidation reaction, the substance that loses electrons is said to be oxidized, while the substance that gains electrons is said to be reduced. A reduction reaction is a chemical reaction in which an atom, ion, or molecule gains one or more electrons. This results in a decrease in the oxidation state of the species undergoing reduction. In a reduction reaction, the species that gains electrons is referred to as the oxidizing agent, as it facilitates the reduction of the other species involved in the reaction.

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Answer:

False

Explanation:

Scientifically, energy can never be created or destroyed. However it can be transfered. This law is called The Law of Conservation of Energy.

The statement describes conditions in which a mineral can form is "Crystals of minerals dissolve in the groundwater in caves."

Atoms of the relatively similar element and atoms of other elements [such as silica (Si) and calcium (Ca)] can make up a crystal, and they are arranged in a predictable, repeating pattern.

A mineral would be an element as well as a chemical compound which has been produced as a result of geological activity and is often crystalline in nature.

The statement describes conditions in which a mineral can form as "Crystals of minerals dissolve in the groundwater in caves."

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Answer:

A detailed map which shows every feature of the earth accurately including roads, airports, names of places etc is called a topographical map

Explanation:

The total emitted current and temperature relationship can be plotted using the Richardson constant, filament area, and work function for tungsten and LaB6 emitters.

1. The total emitted current in μA as a function of temperature from 0 K to 2600 K can be plotted using the Richardson constant, filament area, and work function of tungsten.

2. The temperature of the filament that yields an emission current of 100 μA can be determined by graphically finding the point on the plot where the current intersects the desired value.

3. On a semilogarithmic decimal scale, both the current from the tungsten source and the LaB6 source can be plotted for temperatures ranging from 1800 K to 2600 K, using their respective Richardson constants, filament areas, and work functions.

4. Graphically, the temperature at which the emission current is approximately 500 μA for the LaB6 emitter can be determined by finding the corresponding point on the plot where the current intersects the desired value.

To plot the total emitted current in μA as a function of temperature from 0 K to 2600 K, we can use the Richardson constant, which is a material-specific constant representing the emission properties of a thermionic emitter. For tungsten, the Richardson constant is on the order of 60 A/K.cm2. By considering the effective emitting part of the filament, which is given as 100×150 microns, we can calculate the total area of the filament. Multiplying the Richardson constant by the filament area and the temperature in Kelvin, we obtain the emitted current in amperes. Converting this to microamperes, we can plot the total emitted current as a function of temperature.

To determine the temperature of the filament that yields an emission current of 100 μA, we can refer to the plot obtained in the previous step. By graphically locating the point where the current intersects the desired value of 100 μA, we can read the corresponding temperature from the x-axis.

For the LaB6 filament, which has a Richardson constant of 40 A/Kcm2 and a work function of 2.5 eV, we can follow a similar process. On a semilogarithmic decimal scale, we can plot the current from both the tungsten source and the LaB6 source for temperatures ranging from 1800 K to 2600 K. By using the respective Richardson constants, filament areas, and work functions, we can calculate and plot the emitted currents for the two sources.

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The correct order of increasing strength of intermolecular forces is C*H_{4} < C*H_{3}*C*H_{3} < C*H_{3}*C*H_{2}*C*H_{3}. Hence, the option (d) is correct.

The strength of intermolecular forces depends on the type of molecules present. There are three types of intermolecular forces that are generally present in molecular substances: van der Waals forces, dipole-dipole forces, and hydrogen bonding. These forces increase in strength as the polarity of the molecule increases. Vanderwaal's forces are considered the weakest intermolecular force between molecules. Van der Waals forces are also called dispersion forces, London forces, or instantaneous dipole forces. These forces arise when there is a temporary formation of dipoles between atoms. These are more pronounced in larger molecules as there is more space for temporary dipoles to occur, which implies that CH4 has the weakest Vanderwaal's forces due to the presence of multiple carbon atoms and the presence of hydrogen atoms in between them. CH3CH3 has a higher intermolecular force than CH4.

Therefore, CH3CH3 has higher intermolecular forces than CH4 and CH3CH2CH3 has the highest intermolecular force out of the three.

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The order of solubility in water for the salts of Pb(II) is Pb(NO3)2 > PbSO4 > PbCl2. This is because Pb(NO3)2 is a highly soluble salt due to the high solubility of nitrate ions in water.

PbSO4 is less soluble than Pb(NO3)2 as sulfate ions are not as soluble in water as nitrate ions. PbCl2 is the least soluble of the three salts due to the low solubility of chloride ions in water.

The solubility of these salts also depends on factors such as temperature, pressure, and pH of the solution. However, under standard conditions, the order of solubility remains as stated above.

In conclusion, the order of solubility in water for Pb(II) salts is Pb(NO3)2 > PbSO4 > PbCl2, with Pb(NO3)2 being the most soluble and PbCl2 being the least soluble.

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Answer:

MgO

is the correct answer

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Answer:

5 grams of iron react with 5 grams of oxygen to produce iron 3 oxide.

The actual yield of the reaction is--- 5 grams.

What is the percent yield?

Explanation:

The balanced chemical equation of the reaction is:

\(4Fe(s)+3O_{2} (g)->2Fe_{2} O_3(s)\)

1)Identify the limiting reagent.

2)Using the limiting reagent calculate the amount of theoretical yield formed.

Identification of limiting reagent:

4 mol of Fe reacts with 3mol. of O2

that is:

4mol(55.84g/mol) of Fe reacts with ---- 3mol (32.0g/mol)

=223.36g of Fe reacts with ---- 96g. of O2

then,

5g of Fe requires how many grams of O2?

\(=>5g. of Fe * \frac{96g O2}{223.36g Fe} \\=2.14g. of O_{2} .\\\)

But provided 5g of O2.

So, O2 is present more than required.

Hence, O2 is the excess reagent and the limiting reagent is Fe.

The amount of product formed depends only on the amount of Fe only.

Theoretical yield:

From the balanced chemical equation:

4mol. of Fe forms ----- 2mol. of Fe2O3.

that is

223.36g of Fe forms --- 2(159.68g)of Fe2O3.

=>223.36g of Fe forms --- 319.36g of Fe2O3.

then,

5g of Fe forms ----? grams of Fe2O3

\(=>5g of Fe * \frac{319.36g Fe2O3}{223.36g of Fe} \\=7.14g. of Fe2O3\\\)

\(%Error =\frac{actual yield}{theoretical yield} * 100\\\\ %error=\frac{5g}{7.14g} * 100\\ %error =70.0\)% error=actual yield/ theoretical yield  x 100

%error=5g./7.14g  x100

=>%error=70.0

Hence, the answer is 70.0%.

Answer:

False

Explanation:

The Universe's birth is only a theory. The theory has changed over the years, but currently the most believed theory is the Big Bang Theory. Also, there is always more to discover

Answer:The plant kingdom consists of organisms which posess the ability to generate their own food through a process called photosynthesis. The animalia kingdom is not capable of this process so they are obligated to obtain food from others. Known to date there are about 250,000 known types of plants.

Answer:

Members of Kingdom Animalia are heterotrophic, whereas members of Kingdom Plantae are typically autotrophic.

Explanation:

Corrosion is the process of chemical or electrochemical attack of materials by their external environment.

The tendency/resistance of different metals to corrosion largely depends on the composition of the metal. Iron and steel corrode in the presence of oxygen due to oxidation, while some metals such as chromium, nickel and molybdenum provide a protective layer of oxide film on the surface of the metal which is then resistant to corrosion. Other metals such as aluminum and zinc form sacrificial oxide layers which corrode and protect the metal from becoming completely damaged.

Answer:

The systematic representation for the distribution of electrons in different energy levels of an atom or orbital of an atom is called electronic configuration .

The electronic configuration of chlorine is 1s^2,2s^2,2p^6,3s^2,3p^6

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If the concentration of nitrosyl bromide in Calculation 4 was doubled, the rate of the reaction would also double. The rate constant would not change.

The rate of a reaction is the amount of reactants consumed or products produced per unit of time. The rate of reaction can be determined by monitoring the disappearance of the reactant, the appearance of the product, or the change in the concentration of the reactant or product over time. The rate law for a chemical reaction is a mathematical formula that relates the rate of the reaction to the concentration of the reactants, and possibly the temperature and pressure.

The order of reaction is the exponent to which the concentration of a reactant is raised in the rate law equation. The rate constant, k, is a constant of proportionality that relates the rate of a reaction to the concentrations of the reactants raised to their respective order in the rate law equation. The rate constant is a temperature-dependent quantity that does not change with changes in the concentrations of the reactants.

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Answer: Hydrogen , Oxygen

Explanation:

H2O= 2H+O

The osmotic pressure of the sucrose solution is 16.845 atm. To calculate the osmotic pressure of the solution, we first need to determine the molarity of the sucrose solution.

The molarity (M) is the number of moles of solute per liter of solution.

1. Convert the mass of sucrose to moles:
(120.0 g sucrose) / (342.3 g/mol) = 0.3504 moles sucrose

2. Convert the volume of water from milliliters to liters:
551 mL * (1 L / 1000 mL) = 0.551 L

3. Calculate the molarity of the sucrose solution:
M = (0.3504 moles sucrose) / (0.551 L) = 0.636 mol/L

Next, we need to determine the temperature in Kelvin:
T(K) = 52 + 273.15 = 325.15 K

Now we can use the osmotic pressure formula, which is:
Π = n/V * R * T

where Π is the osmotic pressure, n/V is the molarity, R is the ideal gas constant (0.08206 L•atm/K•mol), and T is the temperature in Kelvin.

Π = (0.636 mol/L) * (0.08206 L•atm/K•mol) * (325.15 K) = 16.845 atm

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Answer:

meteoroids, meteors, meteorites

Explanation:

yea

The abbreviation 0.1 N HCl means normal hydrochloric acid.By comparing a solution to a standard solution with a known concentration, standardisation is the process of determining the precise concentration

By comparing a solution to a standard solution with a known concentration, standardisation is the process of determining the precise concentration of the solution. As precise concentration measurements are necessary for many scientific and industrial applications, it is a crucial stage in chemical analysis. In order to determine the concentration of the unknown solution, the standardisation procedure entails mixing a measured amount of the standard solution with a known quantity of the solution being tested. The primary standard, which is a pure material with a known and steady concentration, is often the standard solution. Standardization is used in many disciplines, including chemistry, biology, and engineering, to assure

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Hi

In the modern periodic table, the elements are arranged in the order of their increasing atomic number. In the modern periodic table, there are seven horizontal rows called periods and eighteen vertical columns (1 to 18) called groups. The arrangement of the periods and groups results in formation of boxes.

Explanation:

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