The vapor pressure of methanol is 143 mmhg. Identify the best reason to explain why methanol spontaneously evaporates in open air at 25. 0∘c and standard pressure (760 mmhg). The vapor pressure of methanol is 143. Identify the best reason to explain why methanol spontaneously evaporates in open air at 25. 0 and standard pressure (760 ). Under these nonstandard conditions, the partial pressure of methanol is lower than its vapor pressure. Calculations for a closed container show a partial pressure of methanol lower than its vapor pressure. The calculated standard free energy change corresponds to a spontaneous reaction. Heat can be added under these nonstandard conditions to increase the vapor pressure of methanol

Answer

C. Elements in the same column of the periodic table have the same number of electron shells.

Explanation

All the options given are true about the periodic table EXCEPT

C. Elements in the same column of the periodic table have the same number of electron shells.

The reason is elements of the same period have the same number of electron shells. As the elements in a group have the same number of electrons in the outermost shell and valency depends upon the valence electrons in an atom. Therefore all the elements of a group have the same valency or valence electron.

Answer:

Pneumonoultramicroscopicsilicovolcanoconiosis

Explanation:

Answer:

Fibrous root systems are found in monocots

Explanation:

A fibrous root system is universal in monocotyledonous plants and ferns. The fibrous root systems look like a mat made out of roots when the tree has reached full maturity.

Answer: It loses kinetic energy.

During a game. 4 students scored 10 points. 5 students scored 20 points, and 7 students scored 30 points. The average score of the students is 21.875.

In everyday terms, an average is one number chosen to represent a list of numbers; it is often the sum of the numbers divided by the number of numbers in the list (the arithmetic mean). The average of the numbers 2, 3, 4, 7, and 9 (which add up to 25) is, for instance, 5. An average could be another statistic like the median or mode depending on the situation.

Average can be calculate as follows:

Average =( student₁ x scored₁) +( student₂ x scored₂) +(student₃x scored₃)

                                              total student

Average score = (4  x10) + (5x 20) + (7 x 30) = 21.875

                                              16

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In the given chemical equation, oxidation takes place at anode  of the electrochemical cell .

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

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Answer:

Arrow a represents photosynthesis. 2 it transforms sunlight, water, and carbon dioxide into gluton, or food for the plants. 3 It recycles carbon because humans breath in oxygen and exhale carbon dioxide, plants then take in the carbon and exhale oxygen.

Explanation:

Answer:

V2O5 is the empirical formula of vanadium oxide

Explanation:

The molecular mass of Vanadium is  50.949 g/mol

Number of moles of vanadium = 0.3456 g/50.949 g/mol = 0.00696 moles

The molecular mass of Oxygen is 16.0 g/mol

Number of moles of Oxygen = (0.6330 – 0.354) g/16 g/mol = 0.0174 moles

Emperical formula  

V (0.00696 moles/0.00696 moles) O (0.0174 moles /0.00696 moles)

V 1 O2.5

Multiply by two get a whole number  

V2 O5

Explanation:

High emission of CO2 which is bad and the wild animals which live in that spot will flee, thus that place will eventually lose much more ecological diversity.

The number of milliliters of HCl required to reach the endpoint is 10.2 mL.

To determine the number of milliliters of HCl required to reach the endpoint, we need to use the concept of stoichiometry and the known concentrations and volumes of the solutions involved. The balanced chemical equation for the reaction between NaOH and HCl is NaOH + HCl → NaCl + H2O. From the equation, we can see that the ratio of NaOH to HCl is 1:1.

First, we calculate the number of moles of NaOH in the solution by multiplying the concentration (0.045 M) by the volume (25.00 mL converted to liters). This gives us the moles of NaOH in the solution.

Next, we use the stoichiometry of the balanced equation to determine the moles of HCl required to react with the NaOH. Since the ratio is 1:1, the moles of HCl needed will be equal to the moles of NaOH.

Finally, we can calculate the volume of the 0.098 M HCl solution needed to reach the endpoint by dividing the moles of HCl by the concentration (0.098 M). The result is the number of milliliters of HCl required, which is 10.2 mL.

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Answer: ionization energy

Explanation:

Answer:

See explanation

Explanation:

The most important thing to bear in mind when writing chemical reaction equation is that the equation must be balanced. A balanced chemical reaction equation is one in which the number of atoms of each element on the left and right hand sides of the reaction equation is exactly the same.

Equation of magnesium reaction with oxygen

2Mg(s) + O2(g) ------> 2MgO(s)

Equation of magnesium reaction with nitrogen

3Mg(s) + N2(g) ------> Mg3N2(s)

Explanation:

Particles is a gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern....

I hope you got it

Engaging a car exhaust system releases matter.

WHAT IS MATTER?

WHAT ACTIVITIES RELEASE MATTER?

N.B: Other activities like picking up iron filings with a magnet (magnetic field), turbines spinning in a power plant, and turning on an electric hot plate (heat) do not release matter.

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Answer:

0.086

Explanation:

A 5.2 molal aqueous solution of methyl alcohol indicates that 5.2 moles of methyl alcohol are present in 1 kilogram (or 1000 g) of water. Water has a molecular weight of 18 g/mol.

(100g)/18g/mol=55.56 mol

5.2 mol/(5.2mol+55.56 mol)=0.086

Answer:

Method: Measure out 25 cm3 of 0.5 mol dm3 lead(II)nitrate solution and add it to a small beaker. Measure out 25 cm3 of 0.5 mol dm3 of potassium sulfate add it to the beaker and mix together using a stirring rod.

First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

Smelting process is the form of extractive metallurgy to produce a metal from its ore. it is the process of melting and separation of charges .  it is extensive energy process. Plaques are made by pouring molten metal in to a mold. and when it gets cools , it solidified into a copper solid plaque. first nation people use copper as hunting weapons, spear tools etc. copper is metal.

Thus, First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

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Nuclear fusion: this is the joining of two small atomic nuclei into one nucleus. Nuclear fission: this is the splitting of one large atomic nucleus into smaller fragments.

The solubility of mercury(II) iodide (HgI₂) in pure water is determined by its Ksp value, which is 2.9 x 10⁻²⁹.

In a 3.0 M solution of NaI, assuming (HgI₄)₂₋is the only significant species, the solubility of HgI₂can be calculated using the Ksp and K values.

The solubility of HgI2 in pure water can be calculated using its solubility product constant (Ksp). The Ksp value for HgI₂ is given as 2.9 x 10⁻²⁹. Solubility product constant represents the equilibrium constant for the dissolution of a sparingly soluble salt. By solving the equilibrium expression for HgI₂, we can determine its solubility in pure water.

In a 3.0 M solution of NaI, assuming the formation of (HgI₄)₂₋ is the only significant Hg-containing species, the solubility of HgI2 can be calculated using the Ksp and K values. The K value given for(HgI₄)₂₋ - is 6.8 x 10²⁹. By setting up an equilibrium expression considering the dissociation of HgI₂ into (HgI₄)₂₋  ions, we can determine the solubility of HgI₂in the presence of the NaI solution.

These calculations involve using the principles of equilibrium and the relationship between concentrations of dissolved species and their equilibrium constants. Solubility is defined as the maximum amount of solute that can be dissolved in a given solvent under specific conditions. By applying the relevant equilibrium expressions and values, we can determine the solubility of HgI₂ in each situation.

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The pressure of hydrogen gas formed  is 720.8 mmHg.

The pressure exerted by a (specified) component in a mixture of gases.

We have to understand one thing that the Hydrogen, which is collected over water, will be mixed with water vapor.

This means that the total pressure of the mixture will have two components.

The vapor pressure of water at that temperature is approximately

19.231 mmHg.

This means that

\(\rm P_{total} = P_{hydrogen} + \; P_{water vapor}\)

740 = \(\rm P_{hydrogen}\) + 19.231

\(\rm P_{hydrogen}\) = 740-19.231

\(\rm P_{hydrogen}\) = 720.8 mmHg

Therefore the pressure of hydrogen gas formed  is 720.8 mmHg.

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If there are 0.2 M solutions of both acid and base, the concentrations of hydrogen and hydroxide ions will be equal at equivalence point.

The reaction of sulfuric acid and a basic solution BOH occurs as follows;

H2SO4(aq) + 2BOH(aq) -----> B2SO4(aq) + 2H2O(l)

In the question, we are told that that both the solution of the sulfuric acid and the basic solution are 0.2 M.

The point where all the hydrogen and hydroxide ions have reacted according to the stoichiometry of the reaction. If there is really equimolar amounts of acid and base, the concentration of hydrogen and hydroxide ions will be equal at equivalence point.

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There 88.94 grams would be grams of aluminum chloride are produced when aluminum reacts with 18.0 grams of hydrochloric acid to produce aluminum chloride and hydrogen gas.

To calculate aluminum chloride that are produce first we should write the balance reaction

2Al + 6HCl → 2AlCl₃ + 3H₂,

Then we can calculate the moles of aluminum

Moles aluminum = mass/ mass molar

Moles aluminum = 18 grams / 27 grams / moles

Moles aluminum = 0.667 moles

Form the reaction, it is clear that 2.0 moles of Al react with 6.0 mole of HCl to produce 2.0 moles of AlCl₃ and 3.0 mole of H₂.

using unitary method we can calculate the moles of Aluminum chloride

moles AlCl₃ = 2/2 x mole Al

Moles AlCl₃ = 2/2 x 0.667 moles =0.667 moles

Mass AlCl₃ = moles x mass molar

Mass AlCl₃ = 0.667 moles x 133.34 g/mol

Mass AlCl₃ = 88.94 grams

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Answer:

between 80 to 120

Explanation:

because it would be around 100 but it can't be exact.

Answer:

3

Explanation:

The rust is not formed in test tube 1 since the Gibbs free energy of the products is higher without water being present. Hence, the justified option is C.

The Gibbs free energy of the product is greater when water is present. The given chemical reaction can be represented as:

                         4 Fe(s) + 3O₂(g) → 2Fe₂2O₃(s)

                          ΔG°rxn = -1800 kJ/mol

As the reaction is spontaneous (ΔG°rxn is negative), the reaction proceeds with a release of energy. This implies that the formation of rust in the second test tube shows that the reaction is thermodynamically favored. The student's observation demonstrates that the presence of water has accelerated the reaction, which is consistent with the proposed reaction mechanism in which water is required for oxygen to diffuse to the iron surface.

Gibbs free energy is the difference between the energy of the products and the reactants, so a negative Gibbs free energy indicates that the energy of the products is less than the energy of the reactants. As a result, if water is not present, the Gibbs free energy of the products would be greater than when water is present.

Therefore, the rust is not formed in test tube 1 since the Gibbs free energy of the products is higher without water being present. Hence, the justified option is C. The product is not formed in measurable quantities because the equilibrium constant for the reaction when water is not present is less than one.

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Answer:

1st one: carbon dioxide

2nd: Glucose

3rd: Oxygen

4th: Energy

Sorry if this is wrong because I don't see the options!

Hope this helps!

The chemical formula of 4- ethyl is C19H40.   This  patch is composed of an ethyl group( C2H5) attached to the fourth carbon  snippet( counting from one end) of a direct carbon chain.

It also has a propyl group( C3H7) attached to the fifth carbon  snippet of the same chain. The chain itself has 12 carbon  tittles and three methyl groups(- CH3) attached to the 3rd, 4th, and 7th carbon  tittles. thus, the complete name of the  emulsion is 4- ethyl, where" dodecane" refers to the 12- carbon chain.

This  patch belongs to the class of alkanes, which are hydrocarbons that only contain single bonds between carbon  tittles. The presence of the ethyl and propyl groups creates branching in the carbon chain, which can affect its physical and chemical  parcels compared to a direct alkane with the same number of carbon  tittles. The three methyl groups contribute to the  patch's overall shape and may also affect its reactivity.

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The question in english language is as follows:

What is the formula of 4-ethyl-5-propyl-3,4,7-trimethyldecane?