what is mole concept?

Answer:

The choices that best represent relative mass are

protons = neutrons

neutrons > electrons

protons > electrons

Explanation:

If we assume that the relative mass of proton is 1, then the relative mass of neutron is also equal to 1. The relative mass of electron is about 1/2000 the mass of proton so if the mass of proton is 1 then the relative mass of electron would be 0.00055. Therefore, the mass of electron and neutron cannot be the same and the electron relative mass will be less than that of neutron and proton.

The temperature 0 degree Celsius is the coldest temperature , Option B is the correct answer.

The complete Question is attached with the answer in form of image

The degree of heat a body has measured by the thermometer is called Temperature.

It is asked in the question to determine , which temperature is coldest among the option given

The temperature 0 degree Celsius is the coldest temperature among the options given as it is the lowest

Therefore Option B is the correct answer.

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Answer: 1.6 gram

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given atoms}}{\text {Avogadro's Number}}[/tex]

[tex]\text{Number of moles of water}=\frac{5.05\times 10^{21}}{6.023\times 10^{23}}=8.4\times 10^{-3}moles[/tex]

1 mole of Platinum [tex]Pt[/tex] weighs 195 g

[tex]8.4\times 10^{-3}moles[/tex]  of Platinum [tex]Pt[/tex] weigh =[tex]\frac{195}{1}\times 8.4\times 10^{-3}=1.6g[/tex]

Thus mass of [tex]5.05\times 10^{21}[/tex] platinum atoms is 1.6 gram.

Final answer:

To calculate the mass of 5.05×10²¹ platinum atoms, first find the number of moles using Avogadro's number, then multiply by the atomic mass of Pt, yielding approximately 1.636 grams of Pt.

Explanation:

To determine the mass of 5.05×10²¹platinum atoms, we need to use Avogadro's number (6.022×10²³ atoms/mol) and the atomic mass of platinum (Pt), which is approximately 195 g/mol. First, we calculate the number of moles of platinum atoms:

Number of moles = Number of atoms / Avogadro's number
Number of moles= 5.05×10²¹Pt atoms / 6.022×10²³ Pt atoms/mol
= 8.39×10⁻³ mol Pt

Next, we find the mass of the platinum atoms by multiplying the number of moles by the atomic mass of platinum:

Mass = Number of moles × Atomic mass of Pt
= 8.39×10⁻³ mol Pt × 195 g/mol
= 1.63605 g of Pt

Therefore, the mass of 5.05×10²¹ platinum atoms is approximately 1.636 g.

It can be concluded that the density of solid is greater than 1 g/cm³.

We have a solid which sank to the bottom when placed in water.

We have to investigate about its density.

The density of water is 1 g/cm³.

According to the question -

If a Solid body sinks in water, then it can be concluded that the density of this solid body is greater than that of water. Mathematically -

ρ(b) > 1 g/cm³

Hence, it can be concluded that the density of solid is greater than

1 g/cm³.

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: The Atom

~Sarah Robinsen

i would go with C. Al+3

Answer:

Compost is a mixture dead organic material that can be used as fertilizer

Explanation:

Compost is a natural organic fertilizer that is prepared with different organic materials, providing nutrients and improving soil structure. Compost converts waste into fertilizer and valuable organic matter for soils.

The transformation of organic matter is carried out with composting, that is, the controlled decomposition of organic materials. Among them are fruits, pruning remains, vegetables, among others. The result of this procedure is a completely organic product that improves the soil structure and provides the necessary nutrients to the soil, all naturally.

Compost has a wide variety of advantages. Among them, it can be mentioned that urban waste is reduced considerably because it minimizes environmental problems related to its treatment and transportation. The soil structure will also be improved, helping with water retention, ventilation and the possible effects of frost. And the earth will eventually contain more organic matter and more nutrients; and it is possible to avoid the use of chemical fertilizers that can negatively affect the soil or the health of people. In addition, the lack of these substances produces an increase in the amount of microorganisms beneficial to the life cycle. Earthworms and other organisms will aerate the earth, prevent it from composting and favor the roots of plants.

So, "compost is a mixture dead organic material that can be used as fertilizer"

Answer:

The molecule has a symmetrical distribution of charge.

Explanation:

A CO2 molecule is nonpolar because the molecule is linear and has a symmetrical distribution of charge as seen in this diagram:

Answer:

Lewis structures are shown below

Explanation:

Answer:

A:  Always.

Explanation:

Got it correct on Oddesyware

Skepticism is important to the biochemist to critically evaluate and verify the conclusion about the behavior of water molecules near proteins.

Skepticism is important in this scenario because it would help the biochemist to critically evaluate and verify the conclusion that water molecules occur in groups of five in the presence of proteins. By maintaining a skeptical mindset, the biochemist can consider alternative explanations, conduct further experiments, and review existing research to ensure the validity and accuracy of the conclusion. Skepticism plays a crucial role in scientific inquiry and helps to ensure that scientific findings are reliable and trustworthy.

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The number of silicon-30 atoms in the plate can be calculated using the concept of percent abundance and Avogadro's number. Plugging in the given values, the calculated number of silicon-30 atoms is approximately 4.59 x 10^19.

The number of silicon-30 atoms in the plate can be calculated using the concept of percent abundance and Avogadro's number.

First, we need to determine the mass of the silicon-30 in the plate.

The mass of silicon in the plate can be found by multiplying the mass of the plate by the mass fraction of silicon:

Mass of silicon = Mass of plate x Mass fraction of silicon = (Volume of plate x Density of plate) x Mass fraction of silicon

Next, we can calculate the number of moles of silicon-30:

Number of moles of silicon-30 = Mass of silicon / molar mass of silicon-30

Finally, we can convert the number of moles into the number of atoms using Avogadro's number:

Number of silicon-30 atoms = Number of moles of silicon-30 x Avogadro's number

Plugging in the values, we get:

Number of silicon-30 atoms = (Volume of plate x Density of plate x Mass fraction of silicon) / molar mass of silicon-30 x Avogadro's number

Now, let's calculate the values:

Volume of plate = Length x Width x Thickness - Area of hole x Height of hole

Area of hole = π x (Diameter of hole / 2)^2

Plugging in the values, we get:

Volume of plate = (15.0 cm x 12.5 cm x 2.50 mm) - (π x (2.50 cm / 2)^2 x 2.50 mm)

Now, we can substitute the calculated values into the formula to find the number of silicon-30 atoms:

Number of silicon-30 atoms = ((15.0 cm x 12.5 cm x 2.50 mm) - (π x (2.50 cm / 2)^2 x 2.50 mm) x 8.80 g/cm^3 x 0.073% Si) / (29.97376 g/mol) x (0.0310)

Calculating this expression gives approximately 4.59 x 10^19 silicon-30 atoms in the plate.

Final answer:

By calculating the mass of the Monel plate, the mass of silicon within it using the percent composition, and applying the natural abundance of silicon-30, we find approximately 1.9 × 10²⁰ silicon-30 atoms in the plate.

Explanation:

To calculate the number of silicon-30 atoms in a Monel metal plate with a density of 8.80 g/cm³ that measures 15.0 cm by 12.5 cm and is 2.50 mm thick, having a hole of 2.50 cm diameter, we need to follow these steps:

Determine the volume of the plate (including the hole).

Calculate the mass of the plate using its density.

Find the mass of silicon in the plate using the percent composition.

Calculate the number of moles of silicon based on its mass.

Use the percent natural abundance of silicon-30 to find the moles of silicon-30 specifically.

Use Avogadro's number to convert moles of silicon-30 to the number of atoms.

Let's perform the calculation:

Volume of plate without the hole = (15.0 cm × 12.5 cm × 0.25 cm) = 46.875 cm³

Volume of the hole = (π × (1.25 cm)²) × 0.25 cm = 1.227 cm³

Total volume = 46.875 cm³ - 1.227 cm³ = 45.648 cm³

Mass of plate = Density × Volume = 8.80 g/cm³ × 45.648 cm³ = 401.7 g

Mass of Si in plate = 401.7 g × 0.00073 = 0.293 g

Moles of Si = Mass / Molar mass = 0.293 g / 28.085 g/mol = 0.01044 mol

Moles of Si-30 = Total moles of Si × Percent abundance of Si-30 = 0.01044 mol × 0.0310 = 0.0003236 mol

Number of Si-30 atoms = Moles of Si-30 × Avogadro's number = 0.0003236 mol × 6.02 × 10²³ atoms/mol

The number of silicon-30 atoms in the plate is approximately 1.9 × 10²⁰ atoms, rounded to two significant figures.

Answer:

303.32557 g/mol.

Explanation:

Gold III Chloride is also known as acid gold trichloride.

PROPERTIES OF GOLD III CHLORIDE,AuCl3:

Gold III Chloride exist in colour appearance of Red crystals,and yellow crystals. It has a melting point of 254 °C and a density of

4.7 g/cm3. AuCl3 exist as a dimer( Au2Cl6) and it is somewhat covalent.

Molar mass is the the mass of one mole of a substance and is expressed in g/mol. Gold atomic mass is 196.96657, chlorine has 35.453.

Hence, molar mass of AuCl3= atomic number of Gold + atomic mass of chlorine × (number of atoms of chlorine in AuCl3).

Molar mass of AuCl3 = 196.96657 + (35.453 × 3). = 196.96657 + 106.359.

Molar mass of AuCl3= 303.32557 g/mol.

The molar mass of  compound AuCl₃is 303.32557 g/mole.

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.

Molar mass of AuCl₃ = 196.96657 + (35.453 × 3). = 196.96657 + 106.359.

Molar mass of AuCl₃= 303.32557 g/mol.

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Answer: 30.8 g

Explanation:

Final answer:

Valence electrons are pivotal in chemical bonding, participating in either sharing (covalent bonding) or transferring (ionic bonding) to achieve stable electronic configurations aimed at fulfilling the octet rule. Electronegativity influences the nature of these bonds, and the valence bond theory explains the formation of stable compounds through energy considerations.

Explanation:

Valence electrons play a crucial role in the formation of compounds from elements. These electrons are located in the atom's outermost shell and are the primary participants in chemical bonding. Elements combine to form compounds by either sharing valence electrons (covalent bonding) or transferring them (ionic bonding) to achieve stable electronic configurations, often aiming for the octet rule, which is a full set of eight valence electrons that provides stability, reminiscent of the noble gases.

Electronegativity significantly influences how these electrons are shared or transferred. Atoms with higher electronegativity tend to attract valence electrons more strongly, leading to polar covalent or ionic bonds depending on the difference in electronegativity between the bonding atoms.

The principle 'like dissolves like' is used to determine the solubility of compounds in CCl₄. These are more likely to dissolve: Br₂ over NaBr, C₆H₁₁OH over CH₃OH, CS₂ over KOH, and I₂ over CaF₂.

The solubility of compounds in CCl₄ can be calculated using the principle 'like dissolves like', which means that substances with similar types of molecular interactions dissolve in each other. Therefore, compounds with similar polarity will dissolve in each other.

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Final answer:

The more soluble compounds in carbon tetrachloride (CCl₄) are those that are non-polar: Br₂, C₆H₁₁OH, CS₂, and I₂, because CCl₄ is a non-polar solvent and 'like dissolves like'.

Explanation:

The question asks which compound in each pair is likely to be more soluble in carbon tetrachloride (CCl₄). Solubility often depends on the similarity principle 'like dissolves like', meaning that polar solvents dissolve polar substances, and non-polar solvents dissolve non-polar substances.

a) Br₂ or NaBr: Br₂ (bromine) is a non-polar molecule, while NaBr (sodium bromide) is an ionic compound. Br₂ will be more soluble in CCl₄ since both are non-polar.

b) CH₃OH or C₆H₁₁OH: C₆H₁₁OH (cyclohexanol) is less polar and has a longer non-polar hydrocarbon chain compared to CH₃OH (methanol). Thus, C₆H₁₁OH will be more soluble in CCl₄.

c) CS₂ or KOH: CS₂ (carbon disulfide) is a non-polar molecule, while KOH (potassium hydroxide) is an ionic and polar compound. CS₂ will be more soluble in CCl4.

d) I2 or CaF₂: I₂ (iodine) is a non-polar molecule, while CaF₂ (calcium fluoride) is an ionic compound. I2 will be more soluble in CCl₄.

Answer:

20.375 moles of oxygen are necessary to completely react with propane to produce 16.3 moles of water.

Explanation:

[tex]C_3H_8 + 5O_2\rightarrow 3 CO_2 + 4H_2O[/tex]

Mole sof water formed = 16.3 moles

According to reaction , 4 moles of water are obtained from 5 moles of oxygen.

Then 16.3 moles of oxygen will be obtained from:

[tex]\frac{5}{4}\times 16.3 mol =20.375 mol[/tex] of oxygen

20.375 moles of oxygen are necessary to completely react with propane.

Answer: Cross breeding

Explanation: Cross breeding can be defined as the method by which two plants can be crossed to produce the desired character and compensate the useless characters shown by the plants individually.

Suppose a plant produces pink flower but small slower and another plant produces white flower but big flower.

If we want big pink colored flower then, these two plants can be crossed among each other so to produce the desired characters and hide the useful characters.

Answer:

B: When you do not need many details about the experiment

Explanation:

Primary Sources are the first-hand accounts of the topic.

Secondary sources are the scholarly books or articles.

The secondary source interprets and also analyzes the primary sources.

Thus, secondary data can be used as a precursor for publishing new primary data.

Thus, Option B: When you do not need many details about the experiment is correct.

The assumption that accounts for the compressibility of gases is that gases consist of molecules which are relatively far apart, meaning the correct answer is A) 1.

In regards to the compressibility of gases, the relevant kinetic molecular theory assumption is that gases consist of molecules which are relatively far apart. This is captured in assumption 1 provided in the student's question. When the particles are far apart, there is a considerable amount of empty space between them compared to liquids and solids. This space allows gases to be compressed, as-the molecules can be brought closer together without significant repulsive forces coming into play due to the fact that there are no significant intermolecular forces acting over these large distances. Therefore, the correct answer to the question - which assumption accounts for the compressibility of gases as compared to liquids and solids - is A) 1.