Why do your feet stay on the ground instead of floating?

Answer:

The correct answer is - 100 grams.

Explanation:

The solubility graph is a very useful tool because it tells you the amount of solute that can be dissolved per  100 mL  of water in order to have a saturated solution of potassium nitrate at a given temperature.

In order to find the solubility of the salt at  30 ∘ C , start from the  30 ∘ C

mark on the graph and move up until you intersect the curve. At the point of intersection, move left until you intersect the  y  axis and read off the value that you land on which is 200. However, it is for 100 ml so half the value you read:

200/2 = 100 gram .

So, solubility  ≈  100 g / 50 mL water

So, a saturated solution of solute will hold about  100 g  of dissolved solute, that is of dissociated solute, per 50 mL  of water at  30 ∘ C .

Answer:

a) mass of H₂O  produced = 4.0665 * 18 = 73.197 g

b)mass of H₂O  produced = 0.214 * 18 = 3.852 g

c) Oxygen gas, O₂, is the limiting reactant, since the number of moles available for reaction is far smaller and the mass of water produced from it is smaller too.

The reaction is the combustion of hydrogen gas to form water vapor. The question is not complete. A related question is given below:

Consider the following balanced equation:  

2H2 + O2 --------> 2H2O  

If you start with 8.133 g of H2 and 3.425 g of O2, find the following:

a) With excess O2, what mass (grams) of H2O would be produced by the H2?

b) With excess H2, what mass (grams) of H2O would be produced by the O2?

c) What is the chemical formula for the limiting reactant?

Explanation:

Equation of reaction: 2H₂ + O₂ ---> 2H₂O

From the equation of reaction, 2 moles of hydrogen gas reacts with 1 mole of oxygen gas to produce two moles of water

Molar mass of hydrogen gas, H₂ = 2 g/mol; molar mass of oxygen gas, O₂ = 32 g/mol; molar mass of H₂O = 18 g/mol

a) number of moles of hydrogen in 8.133 g = 8.133 g/ 2g/mol = 4.0665 moles

mole ratio of H₂ to H₂O is 1:1, therefore, 4.0665 moles of H₂O will be produced

mass of H₂O  produced = 4.0665 * 18 = 73.197 g

b) number of moles of oxygen in 3.425 g = 3.425 g /32 g/mol = 0.107 moles

mole ratio of O₂ to H₂O is 1:2, therefore, 0.107 * 2 moles of H₂O will be produced = 0.214 moles of H₂O

mass of H₂O  produced = 0.214 * 18 = 3.852 g

c) number of moles of hydrogen in 8.133 g = 4.0665 moles

number of moles of oxygen in 3.425 g = 0.107 moles

mole ratio of H₂ to O₂  = 4.0665/0.107 = 38 : 1

Oxygen gas, O₂, is the limiting reactant, since the number of moles available for reaction is far smaller and the mass of water produced from it is smaller too.

Explanation:

by adding some technique ex. to make the item easier for use, more convenient, more benefits than regular items.

Heterogeneous nucleation and subsequent planar growth allows the generation of a dendritic structure in cast metals, the given statement is true because dendritic structures are common in cast metals, particularly those that solidify quickly.

Dendrites are formed when liquid metal solidifies and develops in a non-uniform manner as a result of the directional growth of individual crystal grains from the nucleation site. Heterogeneous nucleation can occur on solid surfaces like mould walls, where dendrite formation happens in casting processes with an external mould. In the case of a metal casting, the first solidified metal, referred to as the "seed", serves as a heterogeneous nucleation site from which the dendrite grows.

The seed will continue to grow dendritically in all directions until it reaches the casting's outside edge as the metal begins to solidify. This leads to the development of a dendritic structure. Example: Pure aluminum solidifies in the form of dendrites under ordinary circumstances, which is a classic example of dendritic growth in metal solidification. So therefore the given statement is true because dendritic structures are common in cast metals, particularly those that solidify quickly.

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The correct answer is: the concentration of hydrogen ions in a solution. pH is a measure of the acidity or alkalinity (basicity) of a solution.

It indicates the concentration of hydrogen ions (H+) present in a solution. A solution with a low pH value is considered acidic, while a solution with a high pH value is considered alkaline (basic). The pH scale ranges from 0 to 14, with 7 being neutral. In acidic solutions, the concentration of hydrogen ions is higher than the concentration of hydroxide ions, resulting in a pH value less than 7. In alkaline (basic) solutions, the concentration of hydroxide ions is higher than the concentration of hydrogen ions, resulting in a pH value greater than 7. pH serves as a measure of the relative concentration of hydrogen ions in a solution, which allows us to quantify the acidity or basicity of the solution.

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The molecular formula of a compound which has c and h with molecular ion with an m/z is C6H14.

For molecular formula use the 13 rule.

firstly divide 86 by 133+//1333= 13.

86/13= 6 + 8/13

Use the formula Cn+Hn+r

where n = 6 and r = 8

substituting the values of n and r in the formula

C6+H(6+8)

C6H14 is the molecular formula

Hexane, an organic substance with the chemical formula C6H14, is a straight-chain alkane having six carbon atoms. When pure, it is a colorless liquid with no odor, and its boiling point is about 69 °C (156 °F).

The chemical formula for a molecular compound's molecular formula lists the variety of atoms that make up the molecule.

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Answer:

Correct answer-C 5.3g

Explanation:

Molarity = no. of moles of solute/ volume of of solution in litre

olarity = no. of moles of solute/ volume of of solution in litreno of moles of solute = 0.125×0.25=0.03125

olarity = no. of moles of solute/ volume of of solution in litreno of moles of solute = 0.125×0.25=0.03125one mole AgNO3 weighs 169.87 gm,

olarity = no. of moles of solute/ volume of of solution in litreno of moles of solute = 0.125×0.25=0.03125one mole AgNO3 weighs 169.87 gm,so the mass of 0.03125 moles of AgNO3 = 0.03125×169.87= 5.3084g

The grams of AgNO₃ are needed to prepare 0.125 M solution in 250 mL of water is 5.3 grams.

Moles is a unit which is used to define any amount and it is calculated as:

n = W/M, where

W = required mass

M = molar mass

Given molarity of AgNO₃ = 0.125 M

Volume of water = 250mL = 0.25L

moles (n) from the molarity (M) will be calculated as:

n = M × V

n = (0.125)(0.25) = 0.0312 moles

Now we calculate the mass of AgNO₃ by using the above formula as:

W = (0.0312mol)(169.87g/mol)

W = 5.30 g

Hence option (c) is correct.

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Answer:

Explanation:

I_3^−

The triiodide ion, I3−, is a polyatomic anion composed of three iodine atoms. It has a central iodine atom, which is surrounded by two other iodine atoms in a trigonal planar geometry. The hybridization of the central atom is sp2. This is because the central atom has 3 electron pairs in its valence shell, which means it needs to form three bonds with the other atoms. This requires the central atom to use one s-orbital and two p-orbitals to form three sp2 hybrid orbitals. These three sp2 orbitals are then used to form the three bonds with the other two iodine atoms, resulting in a trigonal planar geometry.

this is the answer, but check the calculations first and see if it matches 0.300 mol/Ls

Answer: D

Explanation: The Eukarya differ from the Archea and Bacteria in that their cells are eukaryotic, meaning they contain a membrane enclosed nucleus and other membrane enclosed organelles.

Eukarya is different from organisms classified as Archaea and Bacteria because Eukarya have membrane-bound nuclei. Therefore, option (D) is correct.

The type of cell of the organism can be classified into three domains. First is the bacteria which have no nucleus present in cells. Then Archaea have no nucleus in the cells but they have a different cell wall than bacteria. Then Eukarya have a nucleus in them.

The domains of Archaea and Bacteria are both composed entirely of small, single-celled organisms but they also have differences. All are composed of prokaryotic cells, which are nucleus-less cells.  T

All the cells in the Eukarya domain contain their genetic material or DNA within the nucleus. Four classes make up the Eukarya domain: Plantae, Fungi, Animalia, and Protista.

Therefore, the domain of the Eukarya is different from organisms classified as Archaea and Bacteria as Eukarya have membrane-bound nuclei.

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Answer:

Mantle convection is the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface. The Earth's surface lithosphere rides atop the asthenosphere and the two form the components of the upper mantle.

I think it is helpful for you!!!!

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The measure of average kinetic energy of molecules is called tempreture.

What is kinetic energy ?

kinetic energy is a form of energy that an particle has by reason of it's motion.

If we want to accelerate an object then we must apply a force .

The average of all kinetic energy the molecule assumed to be directly proportional to the absolute tempreture of the gas.

The Kelvin tempreture of a substance is directly proportional to the average kinetic energy of the particles of the substance.

This is the reason why measure of the average kinetic energy of the molecule of a material called tempreture.

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Answer:

0.897

Explanation:

Its hydrogenation will produce CH₃(CH₂)16CO₂H, as predicted. One type of monounsaturated fatty acid is oleic acid. Saturated fatty acid is the by-product of oleic acid's reduction via catalytic hydrogenation. The saturated fatty acid in this case is stearic acid.

Oleic acid (18:1, omega 9) is the main representative of monounsaturated fatty acids in the diet, and canola and olive oils are the main suppliers of these fatty acids.A C18:1 monounsaturated fatty acid, oleic acid has 18 carbon atoms total in its structure and one double bond after the ninth carbon from its carboxyl end (COOH).

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Answer:

Explanation:

25.2 mol

Number of neutrons = 8

Given

7 protons, 7 electrons, and a mass number of 15.

Required

Number of neutrons

Solution

Within the atom there are subparticles, namely protons, neutrons and electrons

Protons and neutrons are present in the atomic nucleus, while electrons surround the atomic nucleus in the atomic shell

Atomic number = number of protons = number of electrons

Mass number= number of protons + number of neutrons

15 = 7 + number of neutrons

number of neutrons = 8

The alcohol in fermented drinks is option (E) HOCH₂CH₂OH, also known as ethyl alcohol or ethanol.

Fermentation is the process in which microorganisms convert sugars into alcohol and carbon dioxide. In the case of alcoholic beverages, the sugar source can be fruits, grains, or other plant materials. The type of alcohol produced is determined by the specific microorganism used in the fermentation process and the type of sugar source.

Ethanol is the most common type of alcohol found in fermented drinks, and its chemical formula is C₂H₅OH or CH₃CH₂OH. It is a colorless and flammable liquid with a characteristic odor and taste. Ethanol is used as a psychoactive substance in alcoholic beverages, but it also has other applications in industry, medicine, and fuel production.

Option (A) CH₃CH₂CH₂OH is a primary alcohol known as 1-butanol, which is not commonly found in fermented drinks. Options (B) CH₃CH₂OH and (C) CH₃OH are also alcohols, but they are not commonly found in fermented drinks either. Option (D) (CH₃)₂CHOH is a secondary alcohol known as 2-propanol or isopropyl alcohol, which can be found in some fermented beverages but is not as common as ethanol.

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Answer:

B) the difference in thier electronegatives

Explanation:

- The electronegativity value of an element is a measure of its electron affinity

- In essence, the electronegativity value of an element determines if the element is an electron donor or acceptor.

Ultimately, the difference between the electronegativities of two atoms determines how the atoms bond.

The difference in the electronegativities of the two atoms determines the type of bond between two atoms. Therefore, option B is correct.

Electronegativity can be described as the tendency of an element to attract electron pairs toward itself. The value of electronegativity of an element is with respect to another bonded element.

When two atoms are bonded together through a bond and one of them is more electronegative than another atom. Then the electron density of the bond between them lies closer to the more electronegative atom.

The type of bond that can be predicted between two elements by comparing the electronegativities. The large electronegativity differences result in ionic bonds, while smaller electronegativity differences result in covalent bonds.

If the electronegativity difference between bonded atoms is more than 1.7, the bond has an ionic character. If the electronegativity difference between atoms is less than 1.7, the bond is covalent.

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Answer:

it is determined from known oxidation states of other elements

Helium atoms attract one another weakly through London dispersion forces. The correct option is C.

The reason that helium atoms do not combine to form He2 molecules is due to the fact that helium is a noble gas, which means that its outermost electron shell is already full and it has no tendency to gain or lose electrons to form chemical bonds.

However, despite not forming a stable molecule, helium atoms do experience weak attractive forces between them, which are known as London dispersion forces.

These forces arise due to the temporary asymmetry in electron distribution in an atom or molecule, which leads to the formation of temporary dipoles. These temporary dipoles can induce similar dipoles in neighboring atoms or molecules, leading to attractive forces between them.

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Answer:

2.67g of NH4Cl are required

Explanation:

Molarity is an unit of concentration in chemistry defined as the moles of solute (In this case, NH4Cl), per liter of solution.

To prepare 100mL of a 0.50M are required:

100mL = 0.100L * (0.50 moles / L) = 0.0500 moles NH4Cl

As molar mass of NH4Cl is 53.491g/mol:

0.0500 moles * (53.491g / mol) =

Answer:

Metrics are measures of quantitative assessment commonly used for assessing, comparing, and tracking performance or production.

Dimensional analysis is the analysis of the relationships between different physical quantities by identifying their base quantities and units of measure and tracking these dimensions as calculations or comparisons are preformed

EDTA (ethylenediaminetetraacetic acid) is commonly used to determine the hardness of water due to its ability to form complexes with metal ions, particularly calcium and magnesium ions.

Water hardness refers to the concentration of calcium and magnesium ions present in water. These ions can cause scaling, reduce the effectiveness of soaps, and have other negative effects. EDTA acts as a chelating agent, meaning it can bind to metal ions and form stable complexes.

In the process of determining water hardness, a known amount of EDTA solution is added to a water sample. The EDTA molecules form complexes with the calcium and magnesium ions present in the water.

The endpoint of the titration is reached when all the metal ions are complexed by the EDTA, resulting in a color change or an indicator reaching a specific endpoint.

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Answer:

salt is solute,water solvent, the mixture is the solition.

A student dissolves 15 grams of salt in 250 mL of water. The solute is salt and the solvent is water.

A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.

For solutions with components in the same phase, the substances present in lower concentration are solutes, while the substance present in highest abundance is the solvent.

Therefore, A student dissolves 15 grams of salt in 250 mL of water. The solute is salt and the solvent is water.

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The lowest energy chair conformer of the most stable isomer of 4-isopropyl-1,2-dimethylcyclohexane is the one in which the isopropyl group is in the equatorial position.

In the most stable isomer of 4-isopropyl-1,2-dimethylcyclohexane, the two methyl groups are fixed in axial positions (above and below the ring) because the isopropyl group occupies the equatorial position in the chair conformation. The three possible chair conformations for this isomer are shown below:In the first chair conformation, the isopropyl group is in an axial position.

In the second and third chair conformations, the isopropyl group is in an equatorial position.

Out of the two equatorial conformations, the one in which the isopropyl group is in the equatorial position is the more stable one, since it has a lower energy.

In the second chair conformation, the isopropyl group is gauche to one of the axial methyl groups, which results in a steric strain. In the third chair conformation, the isopropyl group is trans to both axial methyl groups, which results in no steric strain.

Hence, the third chair conformation with the isopropyl group in the equatorial position is the lowest energy chair conformer of the most stable isomer of 4-isopropyl-1,2-dimethylcyclohexane.Summary:Therefore, the lowest energy chair conformer of the most stable isomer of 4-isopropyl-1,2-dimethylcyclohexane is the one in which the isopropyl group is in the equatorial position.

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Answer:

2

Explanation:

Electron

Answer:

Explanation:

i cant understand the complete question, can you reword it and ill answer

If the volume of the original sample in Part A changes from 14.0L to 63.0L, without a change in temperature or moles of gas molecules, the new pressure, P2, can be calculated using Boyle's Law. The new pressure P2 = 120.4 torr.

According to Boyle's Law, at constant temperature and moles of gas, the product of pressure and volume remains constant. This can be expressed as P1 * V1 = P2 * V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume, respectively.

Given:

P1 = 542 torr

V1 = 14.0 L

V2 = 63.0 L (new volume)

To find P2, we can rearrange the equation as P2 = (P1 * V1) / V2. Plugging in the given values:

P2 = (542 torr * 14.0 L) / 63.0 L

Calculating this expression, we find the new pressure P2 = 120.4 torr.

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