What i the difference between expanion and contraction? Chapter - Mattter
Cla - 6

The spot with the lowest Rf value would be the most polar one and, thus, the one that is least soluble in the stationary phase.

Does more polarity indicate a higher or lower Rf value?

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According to valence bond theory, ethyne (acetylene, C₂H₂) consists of a total of consisting of two carbon atoms and two hydrogen atoms.

According to the valence bond theory, ethyne is composed of two single covalent bonds. A single covalent bond is a type of chemical bond where two atoms share a pair of electrons. The structure of ethyne consists of each carbon atom covalently bonded to a single hydrogen atom and the two carbon atoms bound to each other by a second single covalent bond.

This structure gives ethyne a chemical formula of C₂H₂, with a bond angle of 180°. The two electrons involved in the single covalent bond between the two carbon atoms in ethyne are shared equally between them.

These shared electrons are referred to as a pi bond. The pi bond is a bit weaker than the single bond and is more susceptible to chemical reactions. It is this weaker pi bond which makes ethyne highly reactive, resulting in the molecule participating in a number of chemical reactions when exposed to certain conditions.

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Answer:

Soil compaction, low organic matter, loss of soil structure, poor internal drainage, salinisation and soil acidity problems are other serious soil degradation conditions that can accelerate the soil erosion process.

Explanation:

Im not sure if its correct :)

Answer:

allylcyclopentane.

it may have other names but this is the most oniwn for this compound

Answer:

Rubidium Chloride is an excellent water soluble crystalline Rubidium source for uses compatible with chlorides.

Compound Formula: ClRb

Melting Point: 715 °C

Boiling Point: 1,390 °C

Explanation:

Answer:

Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. Based on these results, Rutherford proposed the nuclear model of the atom.

Explanation:

The conditions under which peat is formed can be described as partially decayed vegetation being placed under low-pressure, anaerobic, acidic conditions. Hence, option (c) is the correct.

Peat is an accumulation of partially decayed vegetation that has not fully decomposed due to a lack of oxygen and the presence of acidic water. As plant material accumulates, it undergoes microbial and chemical transformations in the absence of oxygen. This results in the formation of peat, a substance that has an acidic pH due to the release of organic acids during decomposition.

The acidic conditions prevent further decomposition, leading to the accumulation of partially decayed plant matter. Under these conditions, peat slowly accumulates and can eventually become a thick layer of organic material. Peat can be found in bogs, moors, and other wetland environments where water is present to maintain the acidic conditions and prevent decay of the organic material.

Overall, peat formation is a slow process, taking hundreds or thousands of years for significant accumulations to form. Peat can be used as a fuel source or in horticulture, but its importance lies mainly in its role as a carbon sink, storing large amounts of carbon and helping to mitigate climate change.

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Mass of 2.23x10²³ atoms of sulphur with molar mass of 32.07 grams per mole is equals to the 2.65 g per mole.

Avogadro's number, is a constant number of units in one mole of any substance (may be defined as its molecular weight in grams), equal to 6.02214076 × 10²³. The units represents electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction. We have 2.23× 10²³ atoms of sulpher. We have to determine the mass of these atoms. Now, one mole of sulphur is 6.02214076 × 10²³ atoms or molecules.

Molar mass of sulphur = 32.07 grams/mol

6.02214076 × 10²³ atoms or molecules = 1 mole

1 atom =\( \frac{ 1}{6.02214076 × 10²³}\)

So, 2.23× 10²³ atoms of sulphur = \(2.23× 10²³ × \frac{ 1}{6.02214076 × 10²³}\) moles. Using molar mass formula, Molar mass = mass of substance divided by number of moles of substance.

=> Mass of sulphur = \(32.07 ×2.23× 10²³ × \frac{ 1}{6.02214076 × 10²³} g\\ \)

= 2.65 g

Hence, required value is 2.65 g per mole.

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To determine the amount of water and methane needed, we can set up a system of equations based on the desired composition of the mixture. you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

Let's assume x represents the number of gallons of water and y represents the number of gallons of methane. We have the following information: The total volume of the mixture is 90 gallons: x + y = 90. The mixture should be 60% methane: (y / (x + y)) * 100 = 60. Simplifying the second equation: y / (x + y) = 0.6. Now we can solve the system of equations: From equation 1, we can express x in terms of y: x = 90 - y. Substituting this into equation 2: y / ((90 - y) + y) = 0.6. Simplifying further: y / 90 = 0.6. Solving for y: y = 0.6 * 90. y = 54. Now we can find x using equation 1: x = 90 - y. x = 90 - 54. x = 36. Therefore, you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

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The concept Arrhenius equation is used here to determine the activation energy for the isomerization of methyl isocyanide. The activation energy is 1.892 kJ / mol.

According to Arrhenius equation, lower the activation energy of a reaction, the higher is the rate of the reaction. The equation can be represented as:

\(k = A. e^{-} ^{E_{a} } / RT\)

For two different temperature and rate constants, the equation is:

log K₂/K₁ = Eₐ / 2.303 R [ T₂ - T₁ / T₁T₂]

log 5.54 × 10⁻² / 4.30 × 10⁻³ = Eₐ / 2.303 × 8.314 [ 503 - 472 / 503 × 472]

Eₐ  = 1.892 kJ / mol

Thus the activation energy for the isomerization of methyl isocyanide is 1.892 kJ / mol.

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Answer:

1.35 M

Explanation:

grams/molar mass=ans./volume(L)

100/164=ans./.450

Answer:

Hot fluids are formed mainly of water and dissolved minerals. They can seep through rocks and chemically react with the minerals in the rocks potentially changing the composition of the rock. Metamorphic rocks can form from other metamorphic rocks.

Answer:

Hot fluids are formed mainly of water and dissolved minerals. They can seep through rocks and chemically react with the minerals in the rocks potentially changing the composition of the rock. Metamorphic rocks can form from other metamorphic rocks.

Explanation:

Temperature and moisture levels of moving air masses would be most helpful for a meteorologist to track in order to most accurately predict changes in weather. Therefore, the correct option is option A.

Weather describes the condition of the atmosphere, such as how hot or cold it is, how wet or dry it is, how quiet or stormy it is, and how clear or foggy it is. Most weather occurrences occur on Earth in the troposphere, or press down of the planetary system just beneath the stratosphere.

Temperature and moisture levels of moving air masses would be most helpful for a meteorologist to track in order to most accurately predict changes in weather.

Therefore, the correct option is option A.

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Answer:

The rule states that electron occupy each orbital singly first before pairing takes place in a degenerate orbital. These implies that the most stable arrangement of electrons in subsheells is the one with the greatest number of parallel spin

Answer:

The 2 ohm branch

Explanation:

Since the resistors are in parallel, they are each connected to the same volatage.   Since   I = V/R    you can see that the one with the smallest resistance will have the greatest current through it .

Answer:

45

Explanation:

kasi madali lng sya buhatun dpat paning kamotan nimo na sili kay magsalig ka sa brainly dahh

The given question is asking about drawing the structural formula of the product of a reaction. The reactant has been given, which is NaOH. NaOH is a base and can react with an acid to form salt and water.

Therefore, it can be assumed that NaOH is reacting with some acidic compound, and the product will be a salt. Here is the structural formula of NaOH: NaOH structural formula Now, let’s take some common acidic compounds to react with NaOH and draw their products:1)

Ethanoic acid NaOH + CH3COOH → CH3COO-Na+ + H2O.

Structural formula of Ethanoic acid Structural formula of Ethanoate ion2) Hydrochloric acid NaOH + HCl → NaCl + H2O.

Structural formula of Hydrochloric acid Structural formula of Sodium chloride3) Sulfuric acid NaOH + H2SO4 → Na2SO4 + 2H2O Structural formula of Sulfuric acid. Structural formula of Sodium sulfateI.

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Orbital is the region is space where there is a high probability of finding an electron in an atom.

The orbitals farthest from the nucleus in the under listed atoms are the valence orbitals.

Ca - s orbital

Tc - s orbital

Br - p orbital

Cf - s orbital

V - s orbital

Fr - s orbital

Np - s orbital

Rn - p orbital

It must be noted that when the d orbitals are filled, they become lower in energy than the 4s orbitals. the empty 3d orbitals are higher in energy than 4s but the filled 3d level is lower in energy than the 4s level.

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The ion expected to have the largest crystal field splitting delta is [Os(CN)6]^3-.

Crystal field splitting (delta) refers to the energy difference between the d-orbitals in a transition metal complex due to the interaction between the metal ion and the surrounding ligands. The magnitude of delta depends on the nature of the ligands, with stronger field ligands causing larger splitting.
In this case, we have two types of ligands: H2O (aqua) and CN- (cyanide). CN- is a stronger field ligand compared to H2O, as it has a higher electron-donating ability. Consequently, complexes containing CN- will have a larger crystal field splitting. Among the given complexes, [Os(CN)6]^3- has the highest oxidation state and is surrounded by the strong field CN- ligands, leading to the largest crystal field splitting delta.

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D. nuclear fusion

I just took the test

Answer:

The vacuum of outer space has essentially zero air. Because sound is just vibrating air, space has no air to vibrate and therefore no sound.

Explanation:

The vacuum of outer space has essentially zero air. Because sound is just vibrating air, space has no air to vibrate and therefore no sound.

Answer:

There is no air in space for sound waves to travel

Reduction potential is a measure of the ability of a substance to be reduced

Reduction potential (Eo) can simply be defined as as that tendency of a chemical species or a substance to be reduced by gaining an electron.

Generally, the reduction potential of any chemical species can be determined by subtracting the standard reduction potential for the reaction occurring at the anode from the standard reduction potential for the reaction occurring at the cathode.

So therefore, reduction potential is a measure of the ability of a substance to be reduced

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Answer: c. a measure of the ability of the substance to be reduced

Explanation:

Explanation:

The steps given in the question are incorrect.

Step 1 should be convert atoms to moles (n). Step 2 should be convert moles (n) to mass (m).

Step 1

Use dimensional analysis to convert the number of atoms to moles.

1 mole atoms = 6.022 × 10²³ atoms

n(Ag) = 2.3 × 10²⁴ Ag atoms × (1 mol Ag/6.022 × 10²³ Ag atoms) = 3.8193 mol Ag

Step 2

Convert the moles of Ag to mass.

mass (m) = moles (n) × molar mass (M)

n(Ag) = 3.8193 mol Ag

M(Ag) = atomic weight on the periodic table in g/mol = 107.868 g Ag/mol Ag

m(Ag) = 3.8193 mol × 107.868 g/mol = 412 g Ag = 410 g Ag rounded to two significant figures

The mass of 2.3 × 10²⁴ Ag atoms is approximately 410 g.

Answer:

\(\boxed {\boxed {\sf 3.8 \ moles \ of \ sulfur}}\)

Explanation:

We are asked to convert a number of atoms to moles.

We can convert atoms to moles using Avogadro's Number, which is 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this problem, the particles are atoms of sulfur. There are 6.022 ×10²³ atoms of sulfur in 1 mole of sulfur.

We use dimensional analysis to convert atoms to moles. This involves setting up ratios. Use Avogadro's Number and the underlined information to make a ratio.

\(\frac {6.022 \times 10^{23} \ atoms \ S}{1 \ mol \ S}\)

We are converting 2.3 ×10²⁴ atoms of sulfur to moles, so we multiply by this value.

\(2.3 \times 10^{24} \ atoms \ S *\frac {6.022 \times 10^{23} \ atoms \ S}{1 \ mol \ S}\)

Flip the ratio. It is equivalent, but it allows the units of atoms of sulfur to cancel.

\(2.3 \times 10^{24} \ atoms \ S *\frac {1 \ mol \ S}{6.022 \times 10^{23} \ atoms \ S}\)

\(2.3 \times 10^{24} *\frac {1 \ mol \ S}{6.022 \times 10^{23} }\)

\(\frac {2.3 \times 10^{24} }{6.022 \times 10^{23} } \ mol \ S\)

\(3.819329127 \ mol \ S\)

The original measurement of atoms (2.3 ×10²⁴) has 2 significant figures, so our answer must have the same. For the number we calculated that is the tenths place. The 1 in the hundredths place to the right (3.819329127) tells us to leave the 8 in the tenths place (3.819329127).

\(3.8 \ mol \ S\)

2.3 ×10²⁴ atoms of sulfur is equal to approximately 3.8 moles of sulfur.

Answer:

1. Isotope with mass number 39.

2. 39.02g/mol

Explanation:

1. The most common isotope is the isotope in the higher proportion, that is:

Isotope with mass number 39.

2. The average atomic mass is the sum of the masses times their abundance. For the element X:

Average atomic mass:

38*0.0967 + 39*0.7868 + 40*0.1134 + 41*0.0031

= 39.02g/mol

The major organic product is Oxymercuration demercuration reaction of alkene gives alcohol. This reaction undergoes a markonikov addition of water. We get more substituted alcohol as product.

An organic product is crafted from materials produced through organic agriculture. most widely known natural merchandise are organic meals gadgets, however garb and personal care gadgets also can be made with organic agriculture.

Alcohol is a psychoactive drug that has been consumed in drinks for … maximum of human history. In chemistry, the term alcohol refers to a whole elegance of natural compounds that consist of a hydroxyl organization – along with an oxygen atom and a hydrogen atom – bonded to a carbon atom.

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The equilibrium constant, K, for the reaction H2(g) + I2(g) ⇄ 2HI(g) can be calculated using the expression K= [HI]2/([H2][I2]). Since the concentrations of H2, I2, and HI are given in the question, we can calculate the equilibrium constant, K, for the reaction.

K = [HI]2/([H2][I2]) = (1.77 × 10-2)2/((1.83 × 10-3)(3.13 × 10-3)) = 4.43 × 104. Therefore, the equilibrium constant, K, for the reaction H2(g) + I2(g) ⇄ 2HI(g) at 425°C is 4.43 × 104.

Using the specified concentrations of H2, I2, and HI, it appears that you have correctly calculated the equilibrium constant, K, for the reaction H2(g) + I2(g) 2HI(g) at 425°C. The ratio of the concentrations of the reactants and products at equilibrium, K, is represented by each concentration being raised to the power of its stoichiometric coefficient.

The concentration of the product, HI, is preferred above the concentrations of the reactants, H2 and I2, at equilibrium, as shown by the value of K = 4.43 104 in this instance. This suggests that at equilibrium, the forward reaction—the creation of HI—is preferred.

It is significant to remember that the equilibrium constant, K, is temperature-dependent, and that temperature changes affect K's value.

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The pH of the alkaline buffer consisting of 0.2 M aqueous ammonia and 0.1 M ammonium chloride is 9.55.

We must utilize the ammonium ion's (\({NH_4}^+\)) \(pK_a\) value of 9.25 to determine the pH of an alkaline buffer made up of 0.2 M aqueous ammonia (\(NH_3\)) and 0.1 M ammonium chloride (\(NH_4Cl\)). The following reaction takes place in this buffer solution:

\(NH_3 + H_2O\) ↔ \({NH_4}^+ + OH^-\)

The ammonium chloride will dissociate to form ammonium ion and chloride ion, but the ammonium ion will react with the hydroxide ion (\(OH^-\)) produced by the reaction above to form ammonia and water, effectively preventing any significant increase in the pH of the solution.

To calculate the pH of the buffer, we can use the Henderson-Hasselbalch equation:

\(pH = pK_a + log(\frac{base}{acid})\)

Where [base] is the concentration of the base (\(NH_3\)) and [acid] is the concentration of the acid (\({NH_4}^+\)).

Putting in the values, we get:

\(pH = 9.25 + log(\frac{0.2}{0.1})\)

⇒ \(pH = 9.25 + log(2)\)

⇒ \(pH = 9.25 + 0.301\)

⇒ \(pH = 9.55\)

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