Meteorologists state that a "falling" barometer indicates an approaching storm. given a barometric pressure of 698.5 mm hg, express the pressure in each of the following units of pressure.
atm =
psi =
kpa =

Answer:

A. Protons and electrons

Answer:  d) -705.55 kJ

Explanation:

Heat of reaction is the change of enthalpy during a chemical reaction with all substances in their standard states.

\(2CO_2(g)+2H_2O(l)\rightarrow C_2H_4(g)+3O_2(g)\) \(\Delta H=+1411.1kJ\)

Reversing the reaction, changes the sign of \(\Delta H\)

\(C_2H_4(g)+3O_2(g)\rightarrow 2CO_2(g)+2H_2O(l)\)

\(\Delta H=-1411.1kJ\)

On multiplying the reaction by \(\frac{1}{2}\) , enthalpy gets half:

\(0.5C_2H_4(g)+1.5O_2(g)\rightarrow CO_2(g)+H_2O(l)\)\(\Delta H=\frac{1}{2}\times -1411.1kJ=-705.55kJ/mol\)

Thus the enthalpy change for the given reaction is -705.55kJ

After the solutions are mixed, a white precipitate of calcium oxalate will form, while the Li+ and Cl- ions will remain in the resulting solution.

When the solutions of CaCl2 and Li2C2O4 are mixed, a double displacement reaction occurs. The calcium ions (Ca2+) from CaCl2 react with the oxalate ions (C2O42-) from Li2C2O4 to form a precipitate of calcium oxalate (CaC2O4) according to the following equation:

CaCl2 + Li2C2O4 → CaC2O4 + 2 LiCl

Since calcium oxalate is insoluble in water, it will form a solid precipitate. The precipitate will appear as a white, finely divided solid in the solution. The remaining ions, Li+ and Cl-, will stay in the solution.

Therefore, after the solutions are mixed, a white precipitate of calcium oxalate will form, while the Li+ and Cl- ions will remain in the resulting solution.

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ANSWER

The number of moles of Pb(SO4)2 is 1.5 moles

EXPLANATION

Given that;

The mass of Li2SO4 is 330g

Follow the steps below to find the moles of Pb(SO4)2

Step 1; Write the balanced equation of the reaction

Step 2; Find the number of moles of Li2SO4 using the below formula

Recall, that the molar mass of Li2SO4 is 109.94 g/mol

The number of moles of Li2SO4 is 3.00 moles

Step 3; Find the number of moles of Pb(SO4)2 using a stoichiometry ratio

In the above equation of the reaction, 1 mole Pb(SO4)2 reacts to give 2 moles LiSO4

Let the number of moles of Pb(SO4) be x

Therefore, the number of moles of Pb(SO4)2 is 1.5 moles

Recovery = (Weight of product recovered ÷ Theoretical yield) × 100% Recovery = (0.251 g ÷ 0.27594 g) × 100% Recovery = 91.08%Therefore, the % recovery of the reaction between 2,3-dimethyl-1,3-butadiene and maleic anhydride to form cyclic anhydride was 91.08%.

Diels-Alder Reaction   Diels-Alder reaction is a chemical process that joins a conjugated diene with a dienophile (a compound containing a double bond) to form a six-membered ring called a cyclohexene ring. It is a chemical reaction that can be used to make new carbon–carbon bonds. The reaction was discovered by two German scientists, Otto Diels and Kurt Alder, in 1928.In the Diels-Alder reaction between 2,3-dimethyl-1,3-butadiene and maleic anhydride to form cyclic anhydride, the % recovery was calculated using the following data:Weight of maleic anhydride used: 185 mg = 0.185 gVolume of diene used: 0.215 mLWeight of cyclic anhydride crystals recovered: 0.251 g% Recovery:We can calculate the percent recovery using the following formula:% Recovery = (Weight of product recovered ÷ Theoretical yield) × 100The theoretical yield of the product can be calculated from the balanced chemical equation as follows:2,3-dimethyl-1,3-butadiene + Maleic Anhydride → Cyclohexene-1,2-dicarboxylic AnhydrideThe molar mass of 2,3-dimethyl-1,3-butadiene is 68 g/mol. The molar mass of Maleic Anhydride is 98 g/mol. The molar mass of Cyclohexene-1,2-dicarboxylic Anhydride is 146 g/mol.Using these values, we can calculate the number of moles of each reactant: moles of diene used = (0.215 mL)(0.788 g/mL)/(68 g/mol) = 0.00248 mol moles of maleic anhydride used = 0.185 g/98 g/mol = 0.00189 mol The theoretical yield of cyclohexene-1,2-dicarboxylic anhydride = 0.00189 mol × 1 mol/1 mol = 0.00189 molThe theoretical yield of cyclohexene-1,2-dicarboxylic anhydride = 0.00189 mol × 146 g/mol = 0.27594 gNow, we can substitute these values into the percent recovery equation:% Recovery = (Weight of product recovered ÷ Theoretical yield) × 100% Recovery = (0.251 g ÷ 0.27594 g) × 100% Recovery = 91.08%Therefore, the % recovery of the reaction between 2,3-dimethyl-1,3-butadiene and maleic anhydride to form cyclic anhydride was 91.08%.

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Answer:

Diamonds are very important in our daily lives ,so therefore it has many uses

1.They are used ad beauty products

2.They are used in automative industry

3.They are used in making windows

4.They are used as medicine

Answer:

d- 7.58 L

Explanation:

According to Charles's law, the temperature in Kelvin is proportional to the volume of a dry gas when the pressure is constant.

Mathematically, V1/T1 = V2/ T2

V1= initial volume= 6.6 L

T1= Initial temperature= 115 °C= (115 °C +273)=388K

V2= final volume

T2= final temperature= 173 °C= ( 173 °C+ 273)= 446K

Substitute the values,

V2=( V1 × T2)/ T1

= (6.6×446)/388

= 2943.6/388

= 7.6L

Answer:

False

Explanation:

Attractive forces between molecules in a solid are weaker than bonds between atoms in a molecule.

It takes much more energy to break intramolecular bonds (bonds within molecules) than it does to break intermolecular bonds (bonds between molecules). As a result, it is more difficult to break apart one molecule of a solid than it is to break the solid or separate the molecules from one another.

Answer:

Negative

Explanation:

Electron is a subatomic particle with a negative charge of -1e unlike the proton which has a positive charge of +1e

In an atom, an electron has a net negative charge revolving in orbits around the nucleus.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

Magnetic Forceeeeeeeeeee

Fe2S3 is The Empirical Formula Of A Compound Containing 53.70% Iron And 46.30% Sulfur.

Fe = 0.961 mol and S = 1.44 mol, Now divide them to get lowest empirical formula. When the subscripts in a chemical formula represent the simplest ratio of the kinds of atoms in the compound, the formula is called an empirical formula.

Most ionic compounds are described with empirical formulas. A molecular formula describes the actual numbers of atoms of each element in a molecule. A compound that contains ions and is held together by ionic bonds is called an ionic compound. The periodic table can help us recognize many of the compounds that are ionic:

When a metal is combined with one or more nonmetals, the compound is usually ionic. This guideline works well for predicting ionic compound formation for most of the compounds typically encountered in an introductory chemistry course. However, it is not always true (for example, aluminum chloride, AlCl3, is not ionic).

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The number of tablespoons of milk needed for 28 pancakes is determined as 12 tablespoons.

option C is the correct answer.

The number of the tablespoons of milk that would be needed is calculated by applying simple proportion method.

3 tablespoons of milk for 7 pancakes;

3 -----------> 7

? tablespoons of milk for 28 pancakes;

? --------------------> 28

Combine the two equations and solve for the number of tablespoons needed as follows;

? = ( 3 x 28 ) / 7

? = 12

Thus, The number of tablespoons of milk needed for 28 pancakes is determined by applying simple proportion.

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The specific heat capacity of the metal was likely higher than that of the water, meaning that it required more thermal energy to increase its temperature by the same amount.

Based on the given information, it can be concluded that the metal sample had a higher temperature than the water before they were combined. As the metal was heated to 75 * c, it likely had a much higher initial temperature compared to the water at 25 * c. When the heated metal was placed into the water, it transferred some of its thermal energy to the water, causing the temperature of the water to rise. The final temperature of the water, which was 26.4 * c, indicates that the amount of thermal energy transferred from the metal to the water was relatively small, since the temperature increase was only 1.4 * c. This suggests that the specific heat capacity of the metal was likely higher than that of the water, meaning that it required more thermal energy to increase its temperature by the same amount.

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Answer:

One mole of H2O is made up of 2 moles of Hydrogen atoms and 1 mode of Oxygen atom. Mass of two moles of Hydrogen atoms = 2x1 g/mol. Mass of one mole of water = 2 g/mol + 16 g/mol = 18/ mol.

Explanation:

I majored in Chemistry

Japan is working to change to sustainable energy sources that can replace non-renewable energy sources. Japan recognizes the importance of transitioning to renewable energy sources in order to mitigate the negative impacts of environmental disasters.

The country aims to reduce its reliance on fossil fuels, such as coal and oil, which contribute to air pollution and climate change. Renewable energy sources, including solar, wind, hydro, and geothermal power, offer a more sustainable and environmentally friendly alternative. These sources generate electricity without depleting natural resources and produce fewer greenhouse gas emissions. By embracing renewable energy, Japan can reduce its carbon footprint and promote a cleaner and more sustainable future.

Japan's shift towards sustainable energy sources is part of its broader strategy to address climate change and achieve its target of carbon neutrality by 2050. The government has implemented policies and incentives to encourage the development and adoption of renewable energy technologies. Investing in renewable energy not only helps reduce environmental risks but also promotes economic growth and energy security. Furthermore, transitioning to sustainable energy sources can create new job opportunities and stimulate innovation in the clean energy sector. To achieve their goals, Japan is also focusing on improving energy efficiency and promoting energy conservation.

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The total volumes of each ideal gas can be expressed as: Total Volumes = (332.32 V/RT + 0 + 0.8616 V/RT + 164.77 V/RT) L
Total Volumes = (498.89 V/RT) L

To calculate the total volumes of each ideal gas, we can use the ideal gas law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature.
For \(H_2\) at 400 atm and 25°C, we can use the ideal gas law to find the volume:
V = nRT/P
n = P*V/RT
n = (400 atm * V)/(0.0821 L*atm/mol*K * (25°C + 273.15 K))
n = 14.8 V/RT mol
At STP (standard temperature and pressure, 0°C and 1 atm), one mole of any gas occupies 22.4 L of volume. Therefore, the volume of H2 at STP is:
V(STP) = n(STP) * 22.4 L/mol
V(STP) = (14.8 * V/RT) * 22.4 L/mol
V(STP) = 332.32 V/RT L
For \(SO_2\) at 2 atm and 0 K, we can use the ideal gas law to find the volume:
V = nRT/P
n = P*V/RT
n = (2 atm * V)/(0.0821 L*atm/mol*K * 0 K)
n = 0 mol
This means that  \(SO_2\)  does not exist as a gas at 0 K and 2 atm.
For N2 at 1 atm and -70°C, we can use the ideal gas law to find the volume:
V = nRT/P
n = P*V/RT
n = (1 atm * V)/(0.0821 L*atm/mol*K * (-70°C + 273.15 K))
n = 0.0385 V/RT mol
At STP, the volume of  \(N_2\)  is:
V(STP) = n(STP) * 22.4 L/mol
V(STP) = (0.0385 * V/RT) * 22.4 L/mol
V(STP) = 0.8616 V/RT L
For CO at 200 atm and 25°C, we can use the ideal gas law to find the volume:
V = nRT/P
n = P*V/RT
n = (200 atm * V)/(0.0821 L*atm/mol*K * (25°C + 273.15 K))
n = 7.37 V/RT mol
At STP, the volume of CO is:
V(STP) = n(STP) * 22.4 L/mol
V(STP) = (7.37 * V/RT) * 22.4 L/mol
V(STP) = 164.77 V/RT L

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Condensation is the process through which a gas changes into a liquid. They come together to form water droplets.

What is Condensation?

Condensation is the process through which matter transitions from its initial gaseous state into its final liquid state. For instance, condensation happens when water vapour in the air, which is in its gaseous form, comes into touch with a cooler surface and turns into liquid water. The water in the air condenses into water droplets when it comes into touch with a cold surface. Evaporation reaction is the opposite of condensation. When water transitions from a gaseous state to a liquid or crystal state, condensation takes place. Any gas can condense at high pressure and low temperature.

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The total negative charge on the electrons in 1.32 mol of helium is 7.95 kc.

To find the magnitude of the total negative charge on the electrons in 1.32 mol of helium, we need to know the number of electrons in 1.32 mol. Since helium has an atomic number of 2, it means it has 2 electrons per atom. Therefore, 1.32 mol of helium contains (1.32 mol) * (\(6.022 x 10^2^3\) atoms/mol) * (2 electrons/atom) = \(1.59 x 10^2^4\) electrons.  

Each electron has a charge of \(1.6 x 10^-^1^9\) coulombs.

Multiplying the number of electrons by the charge of each electron, we get

(\(1.59 x 10^2^4\)electrons) * (\(1.6 x 10^-^1^9\) C/electron)

= \(2.54 x 10^5\) coulombs.  

To convert this into kc, we divide by 1000 to get the answer in thousands of coulombs. Therefore, the magnitude of the total negative charge on the electrons in 1.32 mol of helium is \(2.54 x 10^2\) kc, which is equivalent to 7.95 kc.

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P₂O₅ is an empirical formula

Given

compounds

Required

an empirical formula

Solution

The empirical formula is the smallest comparison of the atoms forming the compound.

Molecular formulas are formulas that show the number of atomic elements that make up a compound.

(empirical formula) n = molecular formula

1. P₂O₅ : the ratio of compounds cannot be further reduced to whole numbers⇒empirical formula

2. P₄O₆ : molecular formula

(P₂O₃)₂=P₄O₆

P₂O₃ : empirical formula

3.C₂H₄ : molecular formula

(CH₂)₂=C₂H₄

CH₂ : empirical formula

4. C₃H₆ : molecular formula

(CH₂)₃=C₃H₆

CH₂ : empirical formula

Answer:

P₂O₅

Explanation:

Explanation:

Ammonia has a formula mass of 17.031 g/mol, so the top blank is 1 and the bottom blank is 17.031

Calculating the product, we get the answer to be 1.5 mol

In summary, to achieve a noble gas-like stable electron configuration, barium needs to lose two electrons, resulting in a Ba²⁺ ion being formed.

Barium is an element with an atomic number of 56 and an electron configuration of [Xe]6s². Its outermost shell, like all other alkaline-earth metals, contains two electrons. It must lose two electrons to achieve a stable octet electron configuration, which is identical to a noble gas with eight electrons in its outermost shell (like Xe).

Barium has an atomic number of 56, indicating that it has 56 electrons in its natural state. Its electron configuration is [Xe]6s², indicating that there are two electrons in the outermost shell. Since noble gases have full outer shells, barium must lose the two electrons in the outermost shell to achieve a stable octet electron configuration, similar to that of a noble gas.

This results in a Ba²⁺ ion being formed, which is stable since it now has a stable electron configuration. Thus, two electrons need to be lost by barium to achieve a noble gas-like stable electron configuration. Answer more than 100 words: Barium is an alkaline earth metal that is found in Group 2 on the periodic table. It is a soft, silvery-white metal that has a high reactivity rate with air, and as a result, it is never found in its natural state.

It was first discovered in 1808 by Sir Humphry Davy, who named it after the Greek word barys, which means "heavy. "Barium's electron configuration is [Xe]6s², indicating that it has 56 electrons in its natural state. Barium has two electrons in its outermost shell, like all other alkaline-earth metals. Since noble gases have full outer shells, barium must lose the two electrons in the outermost shell to achieve a stable octet electron configuration, similar to that of a noble gas. This results in a Ba²⁺ ion being formed, which is stable since it now has a stable electron configuration.

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The calculated value of the cell potential at 298K for an electrochemical cell with the following reaction, when the Ag+ concentration is 1.49 M and the Mg2+ concentration is 5.39×10⁻⁴ M is +2.09 V.

The reaction is:

The standard reduction potentials for each half-reaction are:

The cell potential can be calculated using the following equation:

Plugging in the values we know, we get:

However, we need to take into account the non-standard concentrations of the ions. We can do this using the Nernst equation:

where

Plugging in the values we know, we get:

Therefore, the calculated value of the cell potential at 298K for an electrochemical cell with the following reaction, when the Ag+ concentration is 1.49 M and the Mg2+ concentration is 5.39×10⁻⁴M is +2.09 V.

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Answer:

1.)C₃H₈O

2)OH

3.)1-propanol

1.) C4H8O

2.) C2H6O or CH3CH2OH

3.)Ethanol

Explanation:

Hope this help

The increased distance across the cell will result in an increase absorbance reading.

The concentration of \([Fescn]_2\) would be affected if the cuvette had a 1.5 cm path length rather than the 1.0 cm value used.Since the absorbance of a sample is proportional to the concentration of a sample (as described by the Beer-Lambert law), increasing the path length of the cuvette would result in a decrease in absorbance. This means that the concentration of the sample would be lower than if the 1 cm path length was used. In other words, the concentration of \([Fescn]_2\)would be lower if the cuvette had a 1.5 cm path length than if it had a 1.0 cm path length.

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The concentration of the solution can be determined using Beer's Law, which states that the absorbance of a solution is directly proportional to the concentration of the solution.

The equation for Beer's Law is A = εb, where A is the absorbance, ε is the molar absorptivity, b is the path length, and c is the concentration of the solution. In order to determine the concentration of the solution, we need to know the values of ε and b.
If the molar absorptivity and path length are known, the concentration of the solution can be calculated by rearranging the equation and solving for c:
                                         c = A / (εb)
Plugging in the given values for absorbance, molar absorptivity, and path length, we can calculate the concentration of the solution:
c = 0.3200 a.u./(εb)
Without the values of ε and b, it is not possible to determine the concentration of the solution.
In conclusion, the concentration of the solution can be determined using Beer's Law and the equation A = εbc. However, without the values of ε and b, it is not possible to calculate the concentration of the solution.

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