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Answer: 1) The answer is: c) protons and neutrons.

2) The answer is: a) electrons.

Explanation:

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, Much of the mass of an atom is concentrated in its nucleus. The nucleus contains  protons and neutrons and the outer part of the atom contains  electrons.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit. Electron has -1 charge while proton has +1 charge. Neutron is neutral.

Much of the mass of an atom is concentrated in its nucleus. The nucleus contains  protons and neutrons and the outer part of the atom contains  electrons.

Therefore, much of the mass of an atom is concentrated in its nucleus. The nucleus contains  protons and neutrons and the outer part of the atom contains  electrons.

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Answer:

1 quarter=2.3

X quarter=384403

384403/2.3=167,131.7391304348

THE ANSWER IS 167,131.7391304348

Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Answer:

72.66g of Fe2O3 are produced.

Explanation:

1st) From the balanced equation we know that 2 moles of Fe2O3 are produced from 4 moles of iron (Fe). With a mathematical rule of three we can calculate the moles of Fe2O3 that will be produced from 0.89 moles of iron:

Now we know that 0.455 moles of Fe2O3 are produced.

2nd) Now we have to convert 0.455 moles of Fe2O3 into grams, by using the molar mass of Fe2O3 (159.7g/mol):

So, 72.66g of Fe2O3 are produced.

A complex polymer built of amino acids is called a : protein. They are macromolecules made up of long chains of amino acids that are connected by peptide bonds.

These amino acids are linked together in a specific sequence dictated by the genetic information encoded in the DNA. The sequence of amino acids determines the unique structure and function of the protein.

Proteins have a wide range of functions in biological systems. They serve as enzymes, antibodies, structural components, transporters, signaling molecules, and regulators of various cellular processes. Proteins are essential for the growth, development, and maintenance of cells, tissues, and organs in living organisms.

The diversity of proteins arises from the different combinations and arrangements of the 20 different amino acids that can be found in living organisms. The specific folding and three-dimensional structure of a protein are critical for its proper functioning.

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Answer: A certain element exists as three different isotopes. 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average atomic mass of this element?

Explanation: A certain element exists as three different isotopes. 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average atomic mass of this element? 74.92 amu. Use your periodic table to determine which element this is. As. An element exists

The average atomic mass of the element is 74.93 amu

Let the 1st isotope be A

Let the 2nd isotope be B

Let the 3rd isotope be C

From the question given above, the following data were obtained:

Abundance of A (A%) = 24.1%

Mass of A = 75.23 amu

Abundance of B (B%) = 48.7%

Mass of B = 74.61 amu

Abundance of C (C%) = 27.2%

Mass of C = 75.23 amu

The average atomic mass of the element can be obtained as follow:

= [(75.23 × 24.1)/100] + [(74.61 × 48.7)/100] + [(75.23 × 27.2)/100]

= 18.13043 + 36.33507 + 20.46256

Thus, the average atomic mass of the element is 74.93 amu

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Answer:

sry I don't know much about chemistry

1,640.  The number is rounded up because the digit in the tenths place is 8, which is greater than or equal to 5.

Rounding off is a mathematical process of replacing a number with an approximate value that has a shorter, simpler, or more explicit representation. It is often done to reduce the number of significant figures in a calculation or to make calculations easier. Rounding off is used in many everyday situations, such as calculating a restaurant bill or estimating the amount of paint needed to paint a room. It is also used in more complex calculations, such as in scientific and engineering calculations.

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The RK of methyl orange is 3.5, as it changes color from red to yellow at a pH of 3, and has its most intense color (yellow) at pH 6.

Methyl is an organic compound with a formula of CH3, which is a single carbon atom bonded to three hydrogen atoms. It is a type of hydrocarbon and is the simplest of all alkyl compounds. Methyl is a versatile molecule that can be found in a variety of compounds, including pharmaceuticals, solvents, fragrances, and food additives. It is also used in the production of plastics, rubber, dyes, and other synthetic materials. Additionally, methyl is a key component of natural gas, oil, and coal, and can also be produced from biomass. In the body, methyl is used for a variety of biological processes, such as the metabolism of proteins, carbohydrates, and fats.

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Answer:

To calculate the percent error, you need to know the volume of the air bubble and the volume of the sample being dispensed. In this case, the volume of the air bubble is 0.5 mL and the volume of the sample is 40 mL.

To find the percent error, you can use the following formula:

(Volume of air bubble / Total volume) x 100 = Percent error

Plugging in the values, we get:

(0.5 / 40) x 100 = 1.25%

So if a 0.5-mL air bubble is present in the tip of a buret and it is dislodged during the dispensing of a 40-mL sample, the percent error in the sample will be 1.25%. This means that the actual volume of the sample dispensed would be off by 1.25% of the intended volume.

Answer:

5.Hey Order of reaction is :-

Y>Z>X

6.Phosphorus is soft, waxy and reactive. It reacts with moist air and gives out light. It ignites spontaneously at about 350C and that's why it is stored under kerosene to prevent its reaction in the atmosphere.

it can be also stored in sealed bottles..

Explanation:

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The number of consecutive mRNA bases required to encode for an amino acid is three.

A sequence of three nucleotides in mRNA is known as a codon.

These codons are utilized as a code to determine the order in which the amino acids will be linked during protein synthesis.

Process of protein synthesis:

Protein synthesis refers to the process by which proteins are produced by ribosomes in the cells. Here are the steps involved:

1. Transcription:

2. mRNA processing:

3. Translation:

4. Protein folding:

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235.7 g of Sylvanite would be dug up to obtain 66. 0 g of gold.

As stated in the question, Sylvanite contains 28. 0 % gold by mass.

'By mass' is used to express concentration by mass percentage.

Mass percentage = (mass of component / total mass of compound) x 100

Hence, 28g of gold is present in 100g of  Sylvanite.

28g of gold -> 100g Sylvanite

1g of gold -> 100/28 g Sylvanite

66g of gold -> (100*66)/28  g Sylvanite = 235.7 g of Sylvanite.

Hence, 235.7 g of Sylvanite would be dug up to obtain 66. 0 g of gold.

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Answer:

As a scientist employed by a manufacturer of cookware, I would recommend using alumina (Al2O3) as the material for a ceramic baking dish.

Adding more SO\(_{2}\)(g) would increase the concentration of the reactant and, according to the collision theory, increase the frequency of collisions, thus increasing the reaction rate.

Increasing the temperature would provide more energy to the particles, leading to increased collision frequency and higher kinetic energy, resulting in a higher reaction rate.

Adding a catalyst would provide an alternative reaction pathway with lower activation energy, allowing more particles to overcome the energy barrier and increasing the reaction rate.

Removing some O\(_{2}\)(g) would decrease the concentration of a reactant, reducing the collision frequency and slowing down the reaction rate.

Thus, it is stated that A) Adding some SO\(_{2}\)(g), B) Increasing the temperature, C) Adding a catalyst, and D) Removing some O\(_{2}\)(g) would all affect the rate of the reaction.

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#1

#2

Yes here we can see the dots and crosses clearly.

#3

It's Methane or CH_4

#4

There is no double bond

Answer:

#1

See H and C have shared their electrons so its Covalent bonding

#2

Yes, here we can see the dots and crosses clearly.

Dot and crosses diagram

#3

It's Methane or CH_4

4 single bonds

#4

There is no double bond

Explanation:

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The metal has a specific heat of 0.390 J/g°C.

What is Specific Heat ?

Specific heat is an important concept in thermodynamics and is used to determine the amount of heat required to raise the temperature of a material, or conversely, the amount of heat that is released when a material cools. Different materials have different specific heats, which means that they require different amounts of heat to change their temperature. For example, water has a very high specific heat, which means that it takes a lot of heat energy to raise its temperature, while metals have much lower specific heats and require much less heat energy to change their temperature.

We can use the formula for the heat absorbed or released by a material:

Q = m * c * ΔT

where Q is the heat absorbed or released, m is the mass of the material, c is the specific heat, and ΔT is the change in temperature.

In this case, the metal absorbs 57.2 J of heat, and the temperature of the sample rises 32°C. The mass of the metal is 4.70 g. When these values are added to the formula, we obtain:

57.2 J = 4.70 g * c * 32°C

Solving for c, we get:

c = 57.2 J / (4.70 g * 32°C)

= 0.390 J/g°C

Therefore, the specific heat of the metal is 0.390 J/g°C.

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Answer:

P2 = 2.25 atm

Explanation:

Given:

V1 = 1.5 L. V2 = 2.0 L

P1 = 3.0 atm. P2 = ?

Use Boyle's law and solve for P2:

P1V1 = P2V2

or

P2 = (V1/V2)P1

= (1.5 L/2.0L)(3.0 atm)

= 2.25 atm

The torsional angle between c-ch 3 bonds in the totally eclipsed conformation of butane is 0°.Explanation:In the totally eclipsed conformation of butane,

there is a high degree of torsional strain. The eclipsed conformation has the highest energy level of all butane conformations because of the steric hindrance caused by the overlapping atoms. Atoms that overlap produce strain energy, which raises the energy of the molecule. In the butane molecule,

the maximum torsional angle for the C-C bond is 120 degrees, and the minimum torsional angle is 60 degrees.Therefore, in the totally eclipsed conformation, the C-C bond angle is 0° because the two methyl groups are eclipsed.

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The detailed answer of this question is given below:-

Friedel-Crafts acylation is an electrophilic aromatic substitution reaction in which an acyl halide reacts with an aromatic ring to form an aromatic ketone. The mechanism for the generation of the electrophile involves the reaction of the acyl halide with an electron-rich Lewis acid, such as AlCl3, to form a species known as the acylium ion.

The reaction can be depicted as follows:

The acyl halide reacts with AlCl3 to form the acylium ion:

RCOCl + AlCl3 → RCO+ + AlCl4-

The acylium ion acts as the electrophile, attacking the electron-rich aromatic ring to form an intermediate carbocation:

RCO+ + ArH → RCO+Ar-

The intermediate carbocation rearranges, if necessary, to the most stable form, and protonates to form the final product, an aromatic ketone:

RCO+Ar- → RC(O)Ar + H+

In this mechanism, the acyl halide serves as the source of the acyl group, which is transferred to the aromatic ring via the electrophilic attack by the acylium ion. The Lewis acid, AlCl3, serves to generate the electrophile, while the protonation step at the end forms the aromatic ketone.

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Answer:

C. an entirely new substance with new properties forms as a result of the change

Answer:

. an entirely new substance with new properties forms as a result of the change

Explanation:

Answer:

the correct answer is D) a decrease in decrease in temperature

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Explanation:

The factor that decreases the rate of solution is a decrease in temperature. Details about rate of a solution can be found below.

A solution is a homogeneous mixture, which may be liquid, gas or solid, formed by dissolving one or more substances.

The rate at which a solution moves can be affected by the following:

This means that the factor that decreases the rate of solution is a decrease in temperature.

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The correct option is D as when sterilizing laboratory equipment with ethanol and a flame, neither option A nor option C should be done.

To reduce the chance of accident or fire when sterilizing lab equipment using ethanol and flame, it is important to follow the correct safety procedures. It is important to keep the alcohol completely away from the flame, not just as far away as possible. When exposed to an open flame, even small amounts of vapor from ethanol can catch fire.

It is also unwise to point the tip of the sterilizing tool upwards as given in option C. Any leftover ethanol may collect at the tip of the tool if it is held with the tip up, which increases the chance of flaring or igniting when it comes in contact with the alcohol.

Therefore, the correct option is D.

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According to the Bohr's model, the protons and neutrons of the atom in the middle with the electrons orbiting around them with the ability to jump energy levels.

The Bohr's model was proposed by physicist Niels Bohr in 1913. It is a structural model of an atom. In this model, the electrons travel around the nucleus of an atom in distinct circular orbits or shells. The electrons orbit around the nucleus similar to how planets orbit around the sun. The planets are held in orbit by gravitational force and the electrons are held in their orbit by the electrostatic force between the electrons and protons.

This model explains, all electrons must exist in a discrete shell and can’t be between shells. Each shell has a specific energy level and electrons cannot exist outside of these orbits. For an electron to move to another shell it must absorb or release energy.

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If the natural abundance of chlorine-35 is 75.8% and that of chlorine-37 is 24.2%, then the average atomic mass of chlorine will be 35.44 amu.

Chlorine exists in two isomeric forms which are the chlorine-35 and chlorine-37. The atomic mass of the chlorine elements is basically the average atomic mass of its isotopes depending upon their abundance in nature.

The atomic mass of chlorine-35 is 34.97amu and a natural abundance equal to 75.8 %. The atomic mass of chlorine-37 is equal to 36.97 amu with an abundance of 24.2%.

To calculate the average atomic mass of chlorine,

The abundance of chlorine-35 = 75.8% = 0.758

The abundance of chlorine-37 = 24.2% = 0.242

⇒ Average atomic mass = 34.97 × 0.758 + 36.97 × 0.242

⇒ Average atomic mass = 26.50 + 8.94

⇒ Average atomic mass = 35.44 amu  

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The unit of f''(a) is milliliters/minute^2

The function t=f(a) models the time, in minutes, for a chemical reaction to occur as a function of the amount a of catalyst used, measured in milliliters.

So, here double differentiation is to be done.

t=f(a)

differentiating with respect to t,

d(t)/dt = d(f'(a))/dt

or, d(f'(a))/dt = 1

again differentiating with respect to t,

d [d(f'(a))/dt]/dt = d(1)/dt = 0 ...1

or, f''(a) = 0

so, here if we put 'unit expression' in Left hand side of 1

it is d [d(f'(a))/dt]/dt  i.e.  mililiters/miniute/minute [as given t is measured in minute and f(a) is measured in ml)

or, ml/minute^2

so as we are performing double differentiation, the unit of f''(a) is milliliters/minute^2

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The equation that has been following the law of conservation has been \(\rm H_2\;+\;Cl_2\;\rightarrow\;2\;HCl\). Thus, option D is correct.

The law of conservation of mass states that in a chemical equation, the atoms of reactants and atoms of products for each elements are equal.

In the given reactions,

A. \(\rm H_2\;+\;Cl_2\;\rightarrow\;HCl\)

The equation has 2 atoms of hydrogen and chlorine at reactant side, while 1 atom on product side. Thus, the equation does not follow the law of conservation.

B. \(\rm H_2\;+\;O_2\;\rightarrow\;H_2O\)

The equation has 2 atoms of hydrogen and oxygen at reactant side, while 1 atom on product side. Thus, the equation does not follow the law of conservation.

C. \(\rm H_2\;+\;O_2\;\rightarrow\;2\;H_2O\)

The equation has 2 atoms of hydrogen and oxygen at reactant side, while 2 atoms of oxygen and 4 atoms of hydrogen on product side. Since, the equation has imbalanced hydrogen it does not follow the law of conservation.

D. \(\rm H_2\;+\;Cl_2\;\rightarrow\;2\;HCl\)

The reaction has 2 atoms of hydrogen and chlorine at reactant side, and 2 atom of each on product side. Thus, the equation does follow the law of conservation.

The equation that has been following the law of conservation has been \(\rm H_2\;+\;Cl_2\;\rightarrow\;2\;HCl\). Thus, option D is correct.

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Answer:

Molecule

Explanation:

Answer:

molecule

Explanation:

............

The final temperature of solid sodium hydroxide dissolves in water is 355.88 kelvin.

A given amount of matter's heat capacity is the amount of energy needed to raise its temperature by one degree Celsius. While the heat capacity of 1 mole of a substance is known as its molar heat capacity, the heat capacity of 1 gram of a substance is referred to as its specific heat capacity (or specific heat). The equation q = mcT, where m is the mass of the sample, c is the specific heat, and T is the temperature change, can be used to determine how much heat is gained or lost by a sample (q).

Given

Mass of NaOH = 13.9 g

Mass of water = 250 gram

Specific heat of the solution = 4.18 j/g·k

Initial temperature  = 23.0 °c or 296 kelvin

Heat evolved in process = −44.4 kj/mol

Q = mc (T₂ - T₁)

−44400 j/mol = 263.9 x 4.18 j/g·k x (T₂ - 296k)

T₂ = 355.88 k

Hence, final temperature of NaOH solution is 355.88 kelvin.

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