Reactions tend to run to completion if a product

a. Has a high melting point.

b. Is precipitated as a solid

c. Is a liquid

d. Is ionic

Answer:

false

in chemical reaction element doesnot change into another

Explanation:

Answer: it has full valence shells

Explanation: Hope this is it

Answer:

Neon, along with helium, argon, krypton and xenon, make up the group known as noble gases. These are the most stable and least reactive elements due to having full valence shells (the outer shell has the max number of electrons, two for helium, eight for the rest).

Explanation:

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Answer:

3. Argon

Explanation:

The average atomic mass of an element with a value of 39.95 amu is Argon (Ar). The answer choice number is 3.

1. The slope of the best-fit line is 0.838.

2. The y-intercept of the best-fit line is not applicable for calculating AH.

3. The y-intercept of the best-fit line was not provided for calculating AS.

4. The solubility of Borax is expected to increase as temperature increases because as T increases, ΔH/RT becomes smaller, leading to a larger value of K.

5. It was necessary to ensure that some solid was present in the main solution before taking the samples to measure Ksp to ensure the dissolution process was at equilibrium.

To answer the questions, let's complete the calculations and analysis based on the provided data:

Table 2. Calculations

                                                ~60°C trial   ~50°C trial   ~40°C trial   ~30°C trial   ~20°C trial

Vol. of HCl used (mL)                    16.80          9.90          6.38                 3.71            2.20

Moles of HCl used (mol)             0.00840     0.00495    0.00319       0.00186        0.00110

Moles of borate present (mol)   0.00420      0.00124    0.00160       0.000930   0.000550

[Borate] (M)                                     0.833         0.501        0.317                 0.187          0.109

Ksp   2.31

In(Ksp)   0.838

To calculate the enthalpy change (ΔH) and entropy change (ΔS) for dissolving Borax, we need to plot the values of In(Ksp) vs. 1/T and find the slope and y-intercept of the best-fit line. Then, we can use the equation In(K) = -4AS + R, where A is the slope and R is the gas constant, to calculate ΔH and ΔS.

From the given data, we have:

The slope of the best-fit line: A = 0.838

Y-intercept of the best fit line: -4AS + R = -4(0.838)S + R

To calculate ΔH and ΔS, we need the values of R (the gas constant) and the temperature (T). The value of R is 8.314 J/(mol·K), and T is the absolute temperature in Kelvin (K).

1. The slope of the best-fit line is 0.838.

2. To calculate ΔH (AH), we need the y-intercept of the best-fit line. The equation -4AS + R represents In(Ksp), not AH. Therefore, the y-intercept is not related to AH.

3. The y-intercept of the best-fit line is not applicable to calculate AH.

4. To calculate ΔS (AS), we need the y-intercept of the best-fit line (-4AS + R). However, it was not provided in the given information.

Now let's move on to the additional questions:

1. Do you expect the solubility of Borax to increase or decrease as temperature increases? Select the option that best explains why.

  - A. Solubility will increase because as T increases, ΔH/RT becomes smaller, therefore K will get larger.

2. Why was it necessary to make sure that some solid was present in the main solution before taking the samples to measure Ksp? Select the option that best explains why.

  - B. To ensure the dissolution process was at equilibrium. By having some solid present, it ensures that the solution is saturated and at equilibrium with the solid solute.

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molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.

Answer:

35°C would have the highest velocity because it's temperature is lesser hence the inter molecular forces between it molecules will be stronger and the velocity of the molecules will be lower than the rest.

the 75°C one would have the highest flow rate because its molecules will have a higher velocity and the inter molecular force between them will be less stronger

Patterns of the moon in nature repeat themselves at a specific time of the month.

The physical world was observed, and patterns were found. The search for rules began with an attempt to comprehend these patterns. And when these rules were ultimately understood, the physical world's functioning was revealed.

In nature, patterns include anything that repeatedly occurs. A pattern might recur at a particular hour of the day, day of the week, or season. The term "fractal" refers to patterns in nature that could appear similar at a certain point in time. A full moon, for instance, happens once every 28 days.

The only natural satellite that the Earth has is the moon. It normally circles the planet every day. When the moon is in its full phase, it is facing the sun and remains between the Sun and the Earth. This makes the moon illuminate fully.

The moon is known to follow a pattern of lunar phase every 28 days.

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Answer:

the most common oxidation no.of manganese is + 2 + 3 + 4 + 6 + 7

Explanation:

After 24 hours, only 1/8 (or 12.5%) of the original sample of technetium-99m remains.

What is half life?

Half-life is the amount of time required for a substance, such as a drug or radioactive material, to reduce to half its initial amount. The term is commonly used in the fields of nuclear physics and radiochemistry, where it describes the time required for a nucleus to reach half its original activity. In pharmacology, it is the time it takes for a drug to reduce its dose by half in the bloodstream. In general, the half-life of a substance is the amount of time it takes for the amount of the substance to decrease by half.

This is because the half-life of technetium-99m is 6 hours. This means that after 6 hours, half of the original sample has decayed, leaving only half of the original sample. Then after another 6 hours, half of that remaining sample decays, leaving 1/4 of the original sample. After another 6 hours, half of the remaining sample decays, leaving 1/8 of the original sample. Thus, after 24 hours, only 1/8 of the original sample of technetium-99m remains.

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The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).

An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.

This means that the number of protons in an atom is unique to a specific element.

Iron (Fe) has 26 protons in the nucleus of its atom.

Therefore, an ion with 26 protons is an ion of the element iron (Fe).

Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.

Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons  is Fe (option c)

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The electron configuration for chromium (Cr) with 24 electrons is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵.

To determine the electron configuration of an element, we follow the Aufbau principle, which states that electrons fill the lowest energy orbitals first. Chromium (Cr) has an atomic number of 24, meaning it has 24 electrons.

The electron configuration begins with the 1s orbital, which can hold up to two electrons. The 2s and 2p orbitals follow, accommodating a total of eight electrons (2s² 2p⁶). Next, the 3s and 3p orbitals hold another eight electrons (3s² 3p⁶).

Now, we move to the 4s orbital, which would usually be filled next. However, in the case of chromium, an exception occurs. Chromium's electron configuration deviates from the expected pattern to achieve greater stability. Instead of filling the 4s orbital completely, one electron is transferred to the 3d orbital. Therefore, the electron configuration becomes 4s¹ 3d⁵.

The complete electron configuration for chromium (Cr) with 24 electrons is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵. This configuration follows the Aufbau principle, with the exception of one electron being transferred from the 4s orbital to the 3d orbital for increased stability.

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Answer:

Explanation:

Here, we want to get the name for the given chemical formula

Looking at the formula, we look at the names of the element

The names are sodium and fluorine

We write the name of the metal element first, then the non-metal atom

Thus, we have it as

Answer:

A saturated solution is a solution that contains the maximum amount of solute that is capable of being dissolved. At 20°C, the maximum amount of NaCl that will dissolve in 100. g of water is 36.0 g.

Answer: unsaturated solution.

\(1) \text{ } \text{CaF}_{2}\\\\2) \text{ } \text{H}_{2}\text{S}\\\\3) \text{ } \text{NH}_{3}\\\\4) \text{ } \text{CCl}_{4}\\\\5) \text{ } \text{Na}_{2}\text{O}\)

The amount of carbon dioxide produced from the combustion of a candle formula depends on the specific formula and the mass of the candle. However, on average, the combustion of one gram of wax in a candle produces approximately 3 grams of carbon dioxide.

Most candles are made of paraffin wax, which is a hydrocarbon with the general formula CnH2n+2. Let's assume that we are dealing with a simple hydrocarbon, such as C25H52 (a common component of paraffin wax).

During combustion, the hydrocarbon reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). The balanced chemical equation for the combustion of C25H52 is:

C25H52 + 38O2 → 25CO2 + 26H2O

To find the grams of CO2 produced, we need to know the mass of C25H52 that is combusted. For example, let's say we have 1 mole of C25H52 (molecular weight = 25*12.01 + 52*1.01 = 352.76 g/mol).

From the balanced equation, 1 mole of C25H52 produces 25 moles of CO2. The molecular weight of CO2 is 12.01 (C) + 2*16.00 (O) = 44.01 g/mol. So, the mass of CO2 produced from 1 mole of C25H52 is:

25 moles CO2 * 44.01 g/mol = 1100.25 grams of CO2

So, in this example, the combustion of 1 mole (352.76 grams) of C25H52 from a candle produces 1100.25 grams of carbon dioxide.

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Answer:

D

Explanation:

red

Answer:

Red stars are the coolest along the colors and temperatures of stars.

Explanation:

Hope this helps! <3

Answer:

When chlorine and bromine atoms come into contact with ozone in the stratosphere, they destroy ozone molecules.

Explanation:

If you combine the results of this question with the results from question 3B, what do you know about the total pH change caused by adding the last 0. 1 mL of HNO3 it is now an acid.

A chemical that gives off hydrogen ions in water and forms salts by combining with certain metals. Acids have a sour taste and turn certain dyes red. Some acids made by the body, such as gastric acid, can help organs work the way they should. An example of an acid is hydrochloric acid.Nitric acid is a nitrogen oxoacid of formula HNO3 in which the nitrogen atom is bonded to a hydroxy group and by equivalent bonds to the remaining two oxygen atoms.

Nitric acid is made by reaction of nitrogen dioxide ( NO 2) with water. The net reaction is: 3 NO 2 + H 2O → 2 HNO 3 + NO. Normally, the nitric oxide produced by the reaction is reoxidized by the oxygen in air to produce additional nitrogen dioxide.

pH may be defined as a measure of free acidity. More precisely, pH is defined as the negative log of the hydrogen ion concentration. The range of pH extends from zero to 14. A pH value of 7 is neutral, because pure water has a pH value of exactly 7.

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Answer:

solute, im pretty sure

Explanation:

\(C_{2}\) and \(B_{2}\) molecules show an increase in bond order when one electron is added to the molecule.

When an electron is added to \(C_{2}\) molecule, the bond order increases from  2 to 2.5 as the electron is added into σ\((2Px)\) orbital which is bonding in nature. This leads to stabilization.

\(B_{2}\) has 2 unpaired electrons because of the single occupancy of the degenerate pi orbitals with a bond order one.

Adding one electron to give monoanionic results in pairing one of these electrons leaving one unpaired electron.

The bond order increases to 1.5.

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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 molecular, ionic, and net ionic equations of the reaction between potassium phosphate and copper (II) acetate are given below.

The physical states of the substances are depicted in the balanced chemical equation known as a molecular equation, which we may determine using the solubility principles.

When formulae for compounds are expressed as though they were all molecules, the equation is referred to as a molecular equation.

When dissolved ionic chemicals are represented as free ions, the equation is said to be an ionic equation.

A chemical equation known as an ionic equation expresses the electrolytes in aqueous solution as dissociated ions.

A chemical equation known as the net ionic equation shows how ions or molecules change throughout a process.

Net ionic equations lack the common ions that exist on both sides of the ionic equation and are known as spectator ions. In a reaction, ions that do not change at all are known as spectator ions.

Molecular equation:

\(2K_3PO_4 (aq) + 3Cu(CH_3COO)_2 (aq) \rightarrow 6K(CH_3COO) (aq) + Cu_3(PO_4)_2 (s)\)

Ionic equation:

\(6K^+ (aq) + 2PO_4^{3-} (aq) + 3Cu^{2+} (aq) + 6CH_3COO^- (aq) \rightarrow 6K^+ (aq) + 6CH_3COO^- (aq) + Cu_3(PO_4)_2 (s)\)

Net Ionic equation:

\(3Cu^{2+} (aq) + 2PO_4^{3-} (aq) \rightarrow Cu_3(PO_4)_2 (s)\)

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Answer:

The epicenter

Charge flowed : 240 Coulombs

Given

t = time = 60 s

I = current = 4 A

Required

Charge

Solution

General formula :

Q = I x t

Q = charge (electricity), C

Input the value :

Q = 4 x 60

Q = 240 Coulombs

Answer:

i think it's a (not sure)

The atomic mass of element x is 66.5340 amu.

The atomic mass, also known as the atomic weight, is the weighted average of the masses of all the isotopes of an element, taking into account their natural abundance. It is expressed in atomic mass units (amu) and is used as an indication of the size of an atom.

The atomic mass of an element can be used to determine the relative masses of atoms and is used in chemical calculations and reactions.

The atomic mass of element x can be calculated by weighting the mass of each isotope by its natural abundance and summing them:

Atomic mass of element x = (mass of 65x * abundance of 65x) + (mass of 67x * abundance of 67x)

= (65.2666 amu * 27.42%) + (66.8273 amu * 72.58%)

= 18.0550 amu + 48.4790 amu

= 66.5340 amu

Therefore, the atomic mass of element x is 66.5340 amu.

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Answer:c

Explanation: it’s c