Order each of the following events so that they occur in the proper order with respect to the function of the channels, ion permeability, and changes in membrane potential.1. Repolarization of the membrane2. Depolarization of the membrane to +30 mV3. K+ ion flow out of the neuron increases4. Na+ ion flow into the neuron increases5. Opening of voltage-gated Na+ channels

Answer:

The coefficient of Fe₂O₃ is 1

Explanation:

__Fe₂O₃ + 3H₂ —> 2Fe + 3H₂O

To know the correct coefficient of Fe₂O₃, we shall balanced the equation. This can be obtained as follow:

Fe₂O₃ + H₂ —> Fe + H₂O

There are 2 atoms of Fe on the left side and 1 atom on right side. It can be balance by writing 2 before Fe as shown below:

Fe₂O₃ + H₂ —> 2Fe + H₂O

There are 3 atoms of O on the left side and 1 atom on the right side. It can be balance by writing 3 before H₂O as shown below:

Fe₂O₃ + H₂ —> 2Fe + 3H₂O

There are 2 atoms of H on the left side and 6 atoms on the right side. It can be balance by writing 3 before H₂ as shown below:

Fe₂O₃ + 3H₂ —> 2Fe + 3H₂O

Now, the equation is balanced.

Thus, the coefficient of Fe₂O₃ is 1

The reaction becomes spontaneous at approximately 2667 Kelvin.

To determine the temperature at which a nonspontaneous reaction becomes spontaneous, we can use the equation ΔG = ΔH - TΔS, where ΔG is the change in Gibbs free energy, ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy.

In this case, we are given ΔH = 144 kJ/mol and ΔS = 54 J/K mol. To convert ΔH to J/mol, we multiply by 1000, giving us ΔH = 144,000 J/mol.

To find the temperature at which the reaction becomes spontaneous, we set ΔG to zero, as this is the condition for equilibrium. Thus, we have 0 = ΔH - TΔS.

Rearranging the equation, we have TΔS = ΔH, and substituting the given values, we get T * 54 J/K mol = 144,000 J/mol.

Dividing both sides by 54 J/K mol, we find that T = 144,000 J/mol / 54 J/K mol = 2667 K.

Therefore, the reaction becomes spontaneous at approximately 2667 Kelvin.

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The substance known as "desflurane," a halogenated ether, is frequently used as an anesthetic.

One of the more popular anesthetic gases, nitrous oxide has been in use for about 200 years. This substance, in contrast to several other anesthetics, can be used to both cause unconsciousness and manage pain. Compared to ether, chloroform is more poisonous and strong.

General anesthesia is most frequently used for major operations, such as knee and hip replacements, heart surgeries, and many sorts of surgical procedures to cure cancer, even though there are many different types and degrees of anesthetic drugs to keep you from feeling pain during surgery.

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Answer:

By looking at the pattern of lines, scientists can figure out the energy levels of the elements in the sample. Since every element has unique energy levels, the spectra can help identify elements in a sample.

Explanation:

please mark this answer as brainliest

Answer:

I hope this helps!

Explanation :Each element has its own unique atomic emission spectrum. You can look at the spectra and identify which elements are present.

Explanation:

When an atom absorbs energy, its electrons jump to higher energy levels. Then they jump back down again. Each jump corresponds to a particular wavelength of light.

There are many possible electron transitions for each atom. Each transition has a specific energy difference. This collection of transitions makes up an emission spectrum. These emission spectra are as distinctive to each element as fingerprints are to people.

Answer:

Explanation:

yes i does

Answer:

Explanation:

It orbits

Explanation:

First element

1s2 2s2 2p6 3s2 3p6

Atomic Number = 18

Element = Argon

Second Element

1s2 2s2 2p6 3s2

Atomic Number = 12

Element = Magnesium

Second Element

1s2 2s2 2p6 3s2 3p6 4s1

Atomic Number = 19

Element = Potassium

In the periodic table;

The general trend is for ionization energy to increase moving from left to right across an element period. It would decrease down the group.

Both Argon and Magnesium are on the same period. Potassium is o the period below.

This leads us to;

Magnesium - 0.7377 MJ/mol

Argon -  1.505 MJ/mol

Potassium - 0.4189 MJ/mol

The atomic radius of atoms generally decreases from left to right across a period.  It would increase down the group.

This leads to;

Magnesium - 1.60

Argon -  0.94

Potassium - 2.35

At equilibrium, the HI concentration is 2.92 mol/L.

For the process H2(g)+CO2(g)updownarrow H2O+CO. at 1660 °C, the equilibrium constant KP is 4. In a 5 liter flask, 0.8 moles each of H2 and CO2 are first injected. Reactions occur in the following order with relation to H2: 1. In experiments 1 and 2, the reaction rate doubles when the initial concentration of H2 is doubled while the initial concentration of Cl2 is held constant.

H2(g) + I2(g) ⇌ 2HI(g)

c = [HI]² / [H2][I2]

At the specified temperature, c = 53.3, hence the following can be written:

53.3 = [HI]^2 / (0.400 mol/L) × (0.400 mol/L)

or, [HI]² = 53.3 × 0.16

or, [HI]² = 8.528

or, [HI] = sqrt(8.528) mol/L

or, [HI] = 2.92 mol/L

As a result, 2.92 mol/L of HI are present at equilibrium.

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Answer:

p4 is the correct answer

Answer:

In what way and in what form does sodium react with water? A colourless solution is formed, consisting of strongly alkalic sodium hydroxide (caustic soda) and hydrogen gas. This is an exothermic reaction.

Answer:

The final concentration of the Randyne in grams per milliliter = 0.011 g/mL

Explanation:

As we know

C1V1 = C2V2

C1 and C2 = concentration of solution 1 and 2 respectively

V1 and V2 = Volume of solution 1 and 2 respectively

Substituting the given values, we get -

\(50 * 15 = X * (15+50)\\X = 11.54\) mg/mL

The final concentration of the Randyne in grams per milliliter = 0.011 g/mL

The final concentration of the Randyne in this solution is 0.01 g /mL.

It is very important to know the dilution methods in a chemistry lab. The dilution from the stock solution can be prepared by using the formula,

\(C_1V_1 = C_2V_2\)

Where,

\(C_1\)- concentration of the stock solution

\(V_1\) - the volume of the stock solution

\(C_2\) - concentration of the diluted solution

\(V_2\) - the volume of diluted solution

Put the values in the formula,

\(50 \times 15 = C_2 \times 75 \\\\C_2 = \dfrac {750}{75 }\\\\C_2 = 10{\rm \ mg/mL \ \ \ or} \\\\ C_2 = 0.01 \rm \ g/mL\)

Therefore, the final concentration of the Randyne in this solution is 0.01 g /mL.

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Answer:

C.) protons and neutrons

Explanation:

Most atoms contain proton(s), neutron(s), and electron(s). Within the nucleus of an atom, there are protons and neutrons. Electrons are located outside of the nucleus.

Answer:

PCl₅: 0.1192M

PCl₃: 0.0734M

Cl₂: 0.0734M

Explanation:

Based on the reaction:

PCl₅ ⇄ PCl₃ + Cl₂

K of reaction is defined as:

K = [PCl₃] [Cl₂] / [PCl₅]

Replacing with concentrations of gases in equilibrium:

K = [0.119] [0.119] / [0.313]

K = 0.0452

Moles of each gas is:

PCl₅: 7.40L × (0.313mol / L) = 2.3162 moles

PCl₃: 7.40L × (0.119mol / L) = 0.8806 moles

Cl₂: 7.40L × (0.119mol / L) = 0.8806 moles

When the volume of the container is increased the system will produce more moles, (That is, produce more products) in order to keep constant the pressure of the container -Le Chatelier's principle-. In equilibrium, molarity of each gas is:

PCl₅: 2.3162 moles - x / 16.6L

PCl₃: 0.8806 moles + x / 16.6L

Cl₂: 0.8806 moles + x / 16.6L

Where X is reaction coordinate.

Replacing in K formula:

0.0452 = [0.05305 + X/16.6] [0.05305 + X/16.6] / [0.13953 - X/16.6]

6.3068x10⁻³ - 2.723x10⁻³ X = 0.0028143 + 0.00639157 X + 0.00362897 X²

0 = -0.0034925 + 0.00911457X + 0.00362897 X²

Solving for X:

X = -2.8 → False answer. There is no negative concentrations

X = 0.3378 moles

Replacing:

PCl₅: 2.3162 moles - 0.3378 / 16.6L = 0.1192M

PCl₃: 0.8806 moles + 0.3378 / 16.6L = 0.0734M

Cl₂: 0.8806 moles + 0.3378 / 16.6L = 0.0734M

Beeing these concentrations the concentrations in equilibrium of the three gases

Answer:

Mass is the independent variable, and boiling point is the dependent variable.

Answer:

1.75 moles

Explanation:

According to CaC₂(s) + 2 H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)

2 moles of H20 will produce 1 mole of Ca(OH)2

therefore 3.5 moles of H2O will produce 3.5 x (1/2) = 1.75 moles of Ca(OH)2

The amide group  is the name  given to the –NR2 group.

Amides are organic molecules with the amide functional group.

Amides can be primary, secondary, or tertiary. We call secondary and tertiary amides N-substituted amides.

Amides are named using the suffix -amide. Amides are formed in the reaction between an acyl chloride and either ammonia or a primary amine.

Amides react with aqueous acid to form a carboxylic acid and ammonium salt, and with aqueous alkali to form a carboxylate salt and ammonia.

Thus ,the amide group  is the name  given to the –NR2 group.

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There are approximately \(1.258 x 10^2^3\) formula units in 50.0 g of PbO2.

We must utilize the molar mass of PbO2 (lead dioxide) and the idea of Avogadro's number to calculate the number of formula units in a given mass of PbO2.

The molar mass of PbO2 is calculated as follows:

1 atom of Pb (lead) has a molar mass of approximately 207.2 g/mol.

2 atoms of O (oxygen) have a combined molar mass of approximately 32.0 g/mol (16.0 g/mol per oxygen atom).

Therefore, the molar mass of PbO2 is:

Molar mass of PbO2 = (1 * molar mass of Pb) + (2 * molar mass of O)

= (1 * 207.2 g/mol) + (2 * 16.0 g/mol)

= 207.2 g/mol + 32.0 g/mol

= 239.2 g/mol

Now, we can use the molar mass to determine the number of formula units in 50.0 g of PbO2.

Number of moles = Mass (in grams) / Molar mass

= 50.0 g / 239.2 g/mol

≈ 0.209 moles (rounded to three decimal places)

Since 1 mole of any substance contains Avogadro's number of particles \((approximately 6.022 x 10^2^3),\)we can calculate the number of formula units by multiplying the number of moles by Avogadro's number:

Number of formula units = Number of moles * Avogadro's number

\(= 0.209 moles * (6.022 x 10^2^3 formula units/mole)\)

≈\(1.258 x 10^2^3 formula units\)

Therefore, there are approximately\(1.258 x 10^2^3\) formula units in 50.0 g of PbO2.

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Answer:

To determine the number of moles of NO produced, we need to use the balanced chemical equation and the stoichiometric coefficients.

First, we need to identify the stoichiometric coefficient of HNO3 in the equation, which is 8. This means that 8 moles of HNO3 react with 2 moles of NO.

To find the number of moles of NO produced from 83 moles of HNO3, we can use a proportion:

8 moles HNO3 / 2 moles NO = 83 moles HNO3 / x moles NO

Solving for x, we get:

x = (2 moles NO x 83 moles HNO3) / 8 moles HNO3

x = 20.875 moles NO

Therefore, 20.875 moles of NO can be made when 83 moles of HNO3 are consumed.

Answer:

when placed in water, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. chemical change = fire is a sign of chemical reaction.

Explanation:

When placed in water the sodium pellets catch the fire and liberate the hydrogen gas. On mixing with water solid sodium forms a colorless basic solution.

Sodium is a soft metal. It is a very reactive element with a low melting point. Sodium reacts very quickly with water, snow, and ice to produce sodium hydroxide and hydrogen. It is an alkali metal and the sixth most abundant metal on earth. It has a silvery white color.

It has a strong metallic luster. On reacting with oxygen it produces sodium oxide which on reacting with the water produces sodium hydroxide.

It is used to improve the structure of certain alloys and soaps. It is also used in the purification of metals. Sodium is also present in sodium chloride, an important compound found in the environment.

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Answer:

Explanation:

A: 0.8 KM/Min

1.6 x 30 = 48

48/60 = 0.8

Answer:

A. Magnet has a north pole and south pole.

Explanation:

- A magnet has a north and south pole

- Magnets attract paper clips due to the metals present

- Magnetic fields are not visible

- North pole and south pole attract each other

Only the first statement is correct, the answer is (A).

Answer:

0.72 g

Explanation:

Note that, the mass in gram of any substance is obtained from the relationship;

Mass= number of moles × molar mass

From the sequence of the reaction, the number of moles of Lithium diisopropylamide is 6.75mmol which is the same as 6.75 × 10^-3 moles

Molar mass of base= 107.1233 g/mol

Hence mass of the base is given by;

6.75 × 10^-3 moles × 107.1233 g/mol = 0.72 g

Answer:

Valence electrons are the electrons in the outermost shell, or energy level, of an atom

Explanation:

Answer:

Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴

Answer:

An aqueous solution of NaNO2 is obtained from the solution containing the salt of a strong base and weak acid. The pH of this solution will be greater than 7. Hence, NaNO2 the solution will be basic or alkaline. Therefore, an aqueous solution of NaNO2 will be basic.

When \(\rm NaNO_2\) is dissolved in water, it becomes slightly basic. However, the degree of basicity is rather low when compared to strong bases such as alkali metal hydroxides.

The salt sodium nitrite (\(\rm NaNO_2\)) is made up of the sodium cation (\(\rm Na^+\)) and the nitrite anion (\(\rm NO_2^-\)). A compound's acidity or basicity is determined by its behaviour in water and the presence of any acidic or basic characteristics. In the instance of NaNO2, hydrolysis occurs when it is dissolved in water. \(\rm NO_2^- + H_2O \rightarrow HNO_2 + OH^-\)

The nitrite ion has a basic nature since it can take a proton. As a result, when dissolved in water, \(\rm NaNO_2\) is slightly basic. However, the degree of basicity is rather low when compared to strong bases such as alkali metal hydroxides.

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Answer:

The acid will react with the metal, causing hydrogen gas and salt to form from it.

Answer:

Life in the Han Dynasty (206 BCE - 220 CE) differed significantly from today in family, government, social structure, religion, and trade. For example, the Han Dynasty emphasized a patriarchal family structure, where the eldest male held authority, and filial piety was highly valued. In contrast, contemporary societies embrace more egalitarian family dynamics with shared decision-making.

The government system of the Han Dynasty relied on a centralized bureaucracy and emphasized meritocracy, while modern societies often adopted democratic systems. Socially, the Han Dynasty followed a hierarchical model influenced by Confucian principles, whereas contemporary societies strive for greater equality and social mobility.

Religion in the Han Dynasty combined Confucianism, Taoism, and Buddhism, whereas modern societies exhibit diverse religious beliefs. Lastly, trade in the Han Dynasty thrived along the Silk Road, while modern trade was globally interconnected and facilitated by technological advancements. These differences highlight the evolution of society over time.

Explanation:

Answer:

3.13%.

Explanation:

The following data were obtained from the question:

Original amount (N₀) = 0.15

Half life (t½) = 2 mins

Number of half-life (n) = 5

Fraction of sample remaining =.?

Next, we shall determine the amount remaining (N) after 5 half-life. This can be obtained as follow:

Amount remaining (N) = 1/2ⁿ × original amount (N₀)

NOTE: n is the number of half-life.

N = 1/2ⁿ × N₀

N = 1/2⁵ × 0.15

N = 1/32 × 0.15

N = 0.15/32

N = 4.69×10¯³

Therefore, 4.69×10¯³ is remaining after 5 half-life.

Finally, we shall the fraction of the sample remaining after 5 half-life as follow:

Original amount (N₀) = 0.15

Amount remaining (N) = 4.69×10¯³

Fraction remaining = N/N₀ × 100

Fraction remaining = 4.69×10¯³/0.15 × 100

Fraction remaining = 3.13%