how many btus must be removed from one pound of water at 200

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, I mole of  (lead) atoms has the largest mass.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

1 mole of marshmallows = 7.2 g/mo

I mole of  (lead) atoms = 207.2 g/mol

I mole of  (carbon dioxide) molecules=44.01 g/mol

Therefore,  I mole of  (lead) atoms has the largest mass.

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Answer:

9.93M

Explanation:

A dilution may be dtetermined from the relationship M1V1 = M2V2, where M and V are the concentration (molar) and V is the volume (liters).

M1V1 = M2V2

V1 = 28.0ml or 0.028L

M2 = 2.50M

V2 = 100.00ml or 0.10L

We want M1, so rearrange the equiation:

M1V1 = M2V2

M1 = (M2V2)/V1

Enter the data:

M1 = (M2V2)/V1

M1 = (2.50M*)(0.1L)/(0.028M)  [M is moles/L]

M1 = 8.93M

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M1V1 = M2V2 is telling us that we have the same number of moles on both sides of the equation.  M is moles/L.  M1V1 is (moles/L)*(Liters) = moles of the solute.  That is the amount the is used in the new 100 ml solution that is 2.50 Molar.  The volume of M1 solution must contain the same number of moles.  Thus M1V1 - M2V2

Answer: Cr2(SO4)3 its this

Explanation:

We must first determine the formula mass of a Cu2O formula unit before we can set it on the nano-balance. As a result, we must increase the greater balance by one formula unit of H2O.

We must first determine the formula mass of a Cu2O formula unit before we can set it on the nano-balance. Since there are two copper atoms and one oxygen atom in every unit of the formula Cu2O, we may determine its mass as follows: Cu2O has a formula mass of 143.1 u, which is equal to 2 atomic masses of copper and 1 atomic mass of oxygen. 0.000 u x 143.1 u/formula unit = 0 formula units is the amount we must increase. The mass of water is expressed as: H2O's formula mass is (2 x hydrogen atomic mass) + (1 x oxygen atomic mass), which equals (2 x 1.008 u) + (1 x 15.999 u) = 18.015 u. The following must be added: 0.000 u; 18.015 u; and 0.000 formula units.

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Metals may be easily molded and bent without breaking because they are malleable and ductile.

By comparing their physical and chemical characteristics, metals and non-metals may be easily identified from one another.

Metals effectively conduct heat and electricity.

Metals often react with water and acids to create basic solutions, and they also produce positive ions in an aqueous solution, according to their chemical characteristics.

Contrarily, non-metals are neither ductile nor malleable, and they have low conductivity for both heat and electricity.

When they interact with water or acids, they can also produce neutral or acidic solutions, as well as negative ions in aqueous solutions.

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Answer:

Fishes undergo both asexual and sexual mode of reproduction with majority of fishes reproducing by sexual mode

Explanation:

Fishes undergo sexual reproduction. The sperm from the male fuses with the eggs of females. Some of the fishes have separate female and male sexes while some are hermaphrodites and have both testes and ovaries. Some species of fishes reproduce through parthenogenesis in which female egg develops into baby fishes without fusing with a sperm cell. Due to this, the offspring are exact copies of their mothers

Answer: yeah i just attached a labeled picture ‍♀️

Place the cursor at the start of the text, then press CTRL+SHIFT+DOWN ARROW. Press CTRL+SHIFT+UP ARROW after advancing the cursor to the end of the paragraph. The Correct option is B.

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Answer:

homogenous mixture

Explanation:

homogenous mixtures appear in one phase and have even particle distribution.

Answer:

Air is indeed a homogeneous mixture of dinitrogen, dioxygen, carbon dioxide and a few other gases. All of the gases are in the same phase, and thus constitute a homogeneous mixture.

Explanation:

Answer:

Niels Bohr

Explanation:

Niels Bohr presented an atom model in which the electron could only occupy specific orbits around the nucleus. The electrons were constrained to particular orbits around the nucleus in this atomic model, which was the first to employ quantum theory.

~

Answer:

neils bohr

Explanation:

on in the pic please mark me as brainlist

Answer:

Option d is correct

Explanation:

The basis of the VSEPR model of molecular bonding is that to minimize repulsions, electron domains in the valence shell of an atom arrange on their own.

According to VSEPR theory, if there are two electron domains on a central atom, they will be arranged such that the angles between the domains are 180°

The element could be X is phosphorus .

What is element?

An element is the fundamental item that can't be easily broken onto smaller of pieces. In chemistry and physics, an elementary is a substance that can't be broken down by non-nuclear reactions. In computing and the  mathematics, an element is the  distinct piece of a larger system or set.

An ionic compound is formed by the ions, which their charges replaced, so the compound Na₂X is formed by the ions Na⁺ and X⁻². Thus, X must gain two electrons to be stable at the octet, so it has 6 valence electrons. Because it can accommodate up to 12 electrons, the element expands the octet, do it must be in the 3rd period or higher.

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Answer:

a pair of jordans

Explanation:

Answer:

the water sample with higher salinity will have greater mass, and it will therefore be more dense.

Explanation:

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Answer:

hope it helps

and give brainliest

Answer:

D. 1 C, 4 O and 4 H

Explanation:

a p e x, just took the quiz

According to  law of conservation of mass, the  set of atoms that must make up the equation's reactants is  1 C, 4 O and 4 H.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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Explanation:

protons and neutrons have approximately the same size, the electron is 1847th, (I think), the size of a proton

The subatomic particles which are having approximately the same mass are neutrons and protons. Thus, option c is correct.

An atom is made of subatomic particles namely neutrons, protons and electrons. The neutrons and protons are located inside the nucleus whereas, the electrons are revolving around the nucleus through circular paths definite energy.

The electrons are having negative charges and protons are of positive charge. For a neutral atom the number of electrons and protons are equal. Electrons have negligible mass.

The mass of an atom is mainly contributed by the nucleus. The mass of neutrons and protons are have approximately same mass. Therefore, option c is correct.

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Higher solubility of \(Ag_{2}S\)

Explanation:

The reason why \(Ag_{2}S\) (silver sulfide) is more soluble than CuS (copper sulfide) can be attributed to the difference in their solubility products and the nature of the metal ions involved.

1. Solubility products: Solubility product (Ksp) is a measure of the equilibrium between a solid and its ions in a solution. A higher Ksp value indicates greater solubility. \(Ag_{2}S\) has a higher Ksp value compared to CuS, making it more soluble.

2. Metal ions:  \(Ag^{+}\) ions are larger and have a lower charge density compared to \(Cu^{2+}\) ions. Lower charge density results in weaker electrostatic attraction between the metal ions and the sulfide ions, making it easier for \(Ag_{2}S\) to dissolve in water compared to CuS.

In conclusion, \(Ag_{2}S\) is more soluble than CuS due to its higher solubility product and the nature of the metal ions involved.

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Answer:

2.02 × 10^5 Pa

Explanation:

According to this question, in an experiment, a container was filled with gas at pressure of 101,000 Pa, at room temperature. When this temperature was doubled, the pressure also increased by two times i.e.

The pressure changed to (101,000 Pa × 2) = 202,000 Pa

This question is asking to represent this in scientific notation. Scientific notation aims at representing a small or too large number in an easy way. It is done by making use of power of ten i.e. a × 10^b

Where; a = decimal number

b = power of ten

In the case of a large number like 202,000, the power of ten is derived by counting the decimal place backwards. If we are to count until we stop in front of the last digit, we will have 5 times.

That is; 2.02000 × 10^5

We can remove every trailing zeros

Hence, the answer is 2.02 × 10^5 Pa.

The number of molecules in 3.5 moles of NaCl is 2.107 × 10²⁴ molecules.

The number of molecules in a substance can be calculated by multiplying the number of moles by Avogadro's number as follows:

no of molecules = no of moles × 6.02 × 10²³

According to this question, 3.5 moles of NaCl are given. The number of molecules can be calculated as follows:

no of molecules = 3.5 × 6.02 × 10²³

no of molecules = 2.107 × 10²⁴ molecules

Therefore, 2.107 × 10²⁴ molecules is the number of molecules in the NaCl.

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The percent of quinine in the tablet is calculated to be approx. 3.98%.

To determine the percent of quinine in the tablet, we need to use the slope and y-intercept from the plot of fluorescence intensity versus concentration of added quinine. The slope of 15.4 represents the change in fluorescence intensity per ppm increase in quinine concentration. The y-intercept of 448 represents the fluorescence intensity when the quinine concentration is zero.

First, we calculate the concentration of quinine in the tablet solution using the slope and y-intercept values.

Using the formula y = mx + b, where y is the fluorescence intensity, m is the slope, x is the concentration of quinine in ppm, and b is the y-intercept, we can rearrange the equation to solve for x.

Substituting the known values, we have  448 = 15.4x + 0.

To isolate x, we subtract the y-intercept from both sides, resulting in 15.4x = 448.

Dividing both sides by 15.4, we find x ≈ 29.09 ppm.

Next, we convert the concentration of quinine in ppm to percent by dividing it by the total volume of the solution (1.000 L) and multiplying by 100. This gives us (29.09 ppm / 1000 ppm) × 100 ≈ 2.91%.

Since the tablet was dissolved in a total volume of 1.000 L, we can calculate the percent of quinine in the tablet by dividing the concentration in the tablet solution by the tablet's weight. Thus, (2.91% / 0.4236 g) × 100 ≈ 3.98%.

Therefore, the percent of quinine in the tablet is approximately 3.98%.

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Answer: Diploid Cells (?)

Explanation:

A molecule of ethanol (C2H6O) is composed of 9 atoms.

Breaking down the molecular formula: C2H6O

There are 2 carbon atoms (C2).

There are 6 hydrogen atoms (H6).

There is 1 oxygen atom (O).

In total, the molecule of ethanol contains 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom, summing up to a total of 9 atoms.

A molecule of ethanol (C2H6O) consists of 2 carbon atoms (C), 6 hydrogen atoms (H), and 1 oxygen atom (O). Therefore, there are a total of 2 + 6 + 1 = 9 atoms in a molecule of ethanol.

Adding up the individual atoms, we get a total of 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom, which sum up to 9 atoms in total.

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You would use mixed solvents and a recrystallization purification of an unknown compound when you are trying to purify a solid compound from a mixture of other compounds.

Mixed solvents are used when a single solvent cannot dissolve the desired compound at room temperature but can dissolve it at a higher temperature. By using a mixture of two solvents, one that dissolves the compound well and one that does not, you can create a solution that will dissolve the compound at room temperature but will allow it to recrystallize as it cools. This process, called recrystallization, is a common method for purifying solid compounds. It is especially useful when the impurities in the mixture are soluble in the solvent at room temperature, but the desired compound is not.

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In the process of recrystallisation, a hot solvent is combined with the impure sample in its solid state.

Recrystallization is called as the fractional crystallization. It is a procedure for purifying an impure compound in a solvent. The method of recrystallization is based on the principle that the solubility of most solids increases with increased temperature.  This is the prominent methods of purification of samples and is commonly executed by heating the sample mixture. This is a technique used to purify chemicals. This process occurs by dissolving a mixture of a compound and impurities in an appropriate solvent either the desired compound or impurities can be removed from the solution leaving the other behind. During this process the solvent and the solid solute will form a saturated solution together.

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Answer: Physical change : tearing of paper, fixing of wtaer

Chemical change:  rusting of iron ,  electrolysis of water​, Rancidification

Explanation:

Physical change is a change in which there is no rearrangement of atoms and thus no new substance is formed. There is only change in physical state of the substance.

Example:  tearing of paper, fixing of wtaer

Chemical change is a change in which there is rearrangement of atoms and thus new substance is formed. There may or may not be a change in physical state.

Example: rusting of iron ,  electrolysis of water​, Rancidification

Answer:

Because the atmospheric pressure at higher altitudes is lower than at sea level.

Water, or any liquid for that matter, boils when its vapor pressure equals the external pressure above the liquid.

The current process is not accurate enough to meet the target contaminant level of 380 ppm. Two modifications can be proposed to improve the process.

Firstly, increasing the average purity index of component 1 (P1) to 0.85 will reduce the contaminant level. Secondly, reducing the average temperature (T) to the minimum value of 120°C will also decrease the contaminant level. These modifications can be justified based on the given equations for the contaminant level and standard deviation.

In the equation for the contaminant level, a higher P1 value will result in a lower contaminant level. By increasing P1 from 0.80 to 0.85, the contaminant level will decrease. Similarly, by reducing the average temperature from its current value, the contaminant level can be further reduced.

To meet the customer's requirement of 99% of the products having a contaminant level between 350 and 410 ppm, additional modifications are needed. Firstly, decreasing the standard deviation of the purity index for both components (P1 and P2) will reduce the process variability and bring the contaminant levels closer to the target range.

Secondly, reducing the standard deviation of the temperature (T) will also help in reducing the variability of the contaminant levels. These modifications will improve the precision of the process and increase the likelihood of meeting the customer's requirement.

In conclusion, the current process is not accurate enough to meet the target contaminant level and the precision requirement of the customer. Modifying the average purity index of component 1, average temperature, and the standard deviations of purity indices and temperature can improve both accuracy and precision.

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Answer: D. (Liquid fuel)