Which element has the lowest first ionization energy?
Be
Sr
OCa
Mg

Answer:

Answer:

Argon Ar is the element that satisfies the following condition

The mass percentage is an important method which is used to calculate the concentration of a solution. The amount of water needed to add in order to make 17.85 % NaCl solution is 230.1 g.

The mass percentage of a component in a solution is defined as the mass in grams of that component present per 100 g of the solution. The term mass percentage is denoted as w/w. It is used to calculate the concentration of a binary solution.

Mass percentage = Mass of the component in the solution / Total mass of solution × 100

17.85 = 50.0 / 50.0 + x × 100

0.1785 (50.0 + x) = 50.0

8.925 + 0.1785 x = 50.0

0.1785 x = 41.075

x = 230.1 g

Thus the amount of water added to make the solution is 230.1 g.

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The combined gas law equation is:

(P1 * V1) / (T1) = (P2 * V2) / (T2)

The volume of the gas at 30 °C is approximately 760.67 mL.

To determine the volume of the gas at 30 °C, we can use the combined gas law equation, which relates the initial and final conditions of temperature and volume for a gas.

The combined gas law equation is:

(P1 * V1) / (T1) = (P2 * V2) / (T2)

Where:

P1 and P2 are the initial and final pressures, respectively

V1 and V2 are the initial and final volumes, respectively

T1 and T2 are the initial and final temperatures in Kelvin, respectively

We need to convert the temperatures from Celsius to Kelvin by adding 273.15 to each value.

Given:

V1 = 550 mL

T1 = -55 °C = 218.15 K

T2 = 30 °C = 303.15 K

Assuming the pressure remains constant, we can rearrange the equation to solve for V2:

V2 = (P1 * V1 * T2) / (P2 * T1)

Since the pressure is not specified in the problem, we can assume it remains constant, allowing us to cancel out the pressure terms. Thus, the final equation becomes:

V2 = (V1 * T2) / T1

Plugging in the given values:

V2 = (550 mL * 303.15 K) / 218.15 K

Simplifying the calculation, we find:

V2 ≈ 760.67 mL

Therefore, the volume of the gas at 30 °C is approximately 760.67 mL.

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Answer:

No, it isn't a spontaneous reaction.

Explanation:

A spontaneous reaction is a reaction that requires no outside intervention to start.

All chemical reactions require energy.

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In the first dissociation of H2A:

molarity    H2A(aq)↔ (HA)^-(aq) + H^+(aq)

initial                0.05 m          0 m           0 m

change               -x                 +x               +x

equilibrium    0.05-x               x                 x

we can neglect X in [H2A] as it so small compared to the 0.05

so by substitution in Ka equation:

Ka1 = [HA][H] / [H2A]

2.2x10^-6 = X^2/0.05

X = √(2.2x10^-6)*(0.05)= 1.1x10^-7

X=   3.32x10^-4 m

∴ [H2A] = 0.05 - 3.32x10^-4 = 0.0497 m

[HA] = 3.32x10^-4 m

[H] = 3.32x10^-4 m

the second dissociation of H2A: when ka2 = 8.2x10^-9

                          HA-(aq)     ↔ A^2- (aq) + H+(aq)

at equilibrium   3.32x10^-4        y              3.32x10^-4

Ka2           = [H+][A^2-] / [HA]

8.2x10^-9 = Y(3.32x10^-4)/(3.32x10^-4)

∴y = 8.2x10^-9 m

∴[A] = 8.2x10^-9 m

PH= -㏒[H+]

   = -㏒(3.32x10^-4)= 3.479  

[A]=8.2x10^-9 m

[H2A] = 0.0497 ≈ 0.05 m

A change in the size of the moon jellies' resource population can change the number of births in the moon jelly population because the big size of the resources can produce more births.

When there is more energy storage molecules present in the moon jellies, they can reproduce more, in more births. Fewer deaths would also lead to the jelly population increasing. The sea turtle population, and the moon jellies consumer population is also decreased.

There must be a change to the birth rate or the death rate in the moon jelly population. Within a population, organisms are born and dying continuously. If the number of births and deaths in a given time interval are equal, then the population size will remain stable.

So we can conclude that a large population of resources will lead to more births.

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Explanation:

yeast and sugar was present

Approximately 60.9% of the total energy in 2005 came from fuels that emitted greenhouse gases. This signifies a significant contribution to global greenhouse gas emissions and highlights the importance of transitioning to cleaner and more sustainable energy sources to mitigate climate change impacts.

To determine the total percent of energy that came from fuels emitting greenhouse gases, we need to consider the energy sources listed in the chart that are known to produce greenhouse gas emissions. In this case, those would be oil, natural gas, and coal.

From the chart, we see that the percentages for these three energy sources are:

Oil: 37.9%

Natural gas: 23%

Coal: Not specified

Although the percentage for coal is not mentioned in the given information, it is a known fact that coal combustion releases greenhouse gases, including carbon dioxide (CO2). Therefore, we can assume that coal is among the fuels emitting greenhouse gases.

Adding up the percentages for oil and natural gas, we have:

37.9% (oil) + 23% (natural gas) = 60.9%

Therefore, approximately 60.9% of the total energy in 2005 came from fuels that emitted greenhouse gases. This signifies a significant contribution to global greenhouse gas emissions and highlights the importance of transitioning to cleaner and more sustainable energy sources to mitigate climate change impacts.

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Answer:He2 & O2

Explanation:

Answer:

Answer:A

Explanation:

Answer:

The cell potential for the given galvanic cell is 0.188 V.

Explanation:

To calculate the cell potential, we can use the Nernst equation:

Ecell = E°cell - (RT/nF)ln(Q)

where E°cell is the standard cell potential, R is the gas constant (8.314 J/mol·K), T is the temperature in Kelvin (25°C = 298 K), n is the number of moles of electrons transferred (in this case, n = 2), F is the Faraday constant (96,485 C/mol), and Q is the reaction quotient.

First, we need to write the half-reactions and their standard reduction potentials:

Sn4+(aq) + 2e- → Sn2+(aq) E°red = 0.15 V

Fe3+(aq) + e- → Fe2+(aq) E°red = 0.77 V

The overall reaction is the sum of the half-reactions:

Sn2+(aq) + 2Fe3+(aq) → Sn4+(aq) + 2Fe2+(aq)

The reaction quotient Q can be expressed as:

Q = [Sn4+][Fe2+]^2 / [Sn2+][Fe3+]^2

Substituting the given concentrations, we get:

Q = (0.00655)(0.01139)^2 / (0.0624)(0.0437)^2 = 0.209

Now we can calculate the cell potential:

Ecell = 0.15 V + 0.0592 V log([Fe2+]^2/[Fe3+]) + 0.0592 V log([Sn4+]/[Sn2+])

= 0.15 V + 0.0592 V log(0.01139^2/0.0437^2) + 0.0592 V log(0.00655/0.0624)

= 0.188 V

Therefore, the cell potential for the given galvanic cell is 0.188 V.

The cell potential for the given galvanic cell in which the given reaction occurs at 25 °C is 0.188 V.

To find the cell potential, we take the Nernst equation:

Ecell = E°cell - (RT/nF)ln(Q)

In which R is the gas constant (8.314 J/mol·K) and E° cell is the standard cell potential.

T temperature in Kelvin (25°C = 298 K), and n is the number of moles of electrons transferred (n = 2), Q is the reaction quotient and F is the Faraday constant (96,485 C/mol).

Firstly, write the half-reactions and then their standard reduction potentials:

Sn⁴⁺(aq) + 2e⁻  → Sn²⁺(aq) E°red = 0.15 V

Fe³⁺(aq) + e⁻ → Fe²⁺(aq) E°red = 0.77 V

The overall reaction is the sum of the half-reactions:

Sn²⁺(aq) + 2Fe³⁺(aq) → Sn⁴⁺(aq) + 2Fe²⁺(aq)

The Q reaction quotient can be written as:

Q = [Sn⁴⁺][Fe²⁺]² ÷ [Sn²⁺][Fe²⁺]²

Substituting the given concentrations, we observe:

Q = (0.00655)(0.01139)² ÷ (0.0624)(0.0437)² = 0.209

Next, we can find the cell potential:

Ecell = 0.15 V + 0.0592 V log([Fe²⁺]²/[Fe³⁺]) + 0.0592 V log([Sn⁴⁺]/[Sn²⁺])

= 0.15 V + 0.0592 V log(0.01139²÷0.0437²) + 0.0592 V log(0.00655÷0.0624)

= 0.188 V

Thus, the cell potential for the given galvanic cell is 0.188 V.

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Answer:

Explanation:

We can use the formula:

q = mcΔT

where q is the heat absorbed, m is the mass, c is the specific heat, and ΔT is the change in temperature.

Given:
specific heat of iron (c) = 0.449 J/g°C
initial temperature (T1) = 24.0°C
final temperature (T2) = 82.1°C
heat absorbed (q) = 948.0 J

Substituting the given values into the formula, we get:

q = mcΔT
948.0 J = m(0.449 J/g°C)(82.1°C - 24.0°C)
948.0 J = m(0.449 J/g°C)(58.1°C)
m = 948.0 J ÷ (0.449 J/g°C × 58.1°C)
m = 33.1 g

Therefore, the mass of the iron piece is 33.1 g (to three significant figures)

Answer:

The correct answer is 18.75 moles X.

Explanation:

We first start with the idea that we have 25.00 moles of D. Next, we must look at the relationships in the balanced equation to find that for every 4 moles of D produced, 3 moles of X are reacted (since it is given that there is excess Y and thus X is the limiting reagent). From this, we can do the following calculation:

25.00 moles D * (3 moles X/4 moles D) = 18.75 moles X

Therefore, your answer is 18.75 moles X.

Hope this helps!

Using the prefix method for covalent compounds, the names of the given compounds are shown below:

LIF: Lithium fluoride

Cl2O7: Dichlorine heptoxide

N2O3: Dinitrogen trioxide

SF6: Sulfur hexafluoride

Na3PO4: Sodium phosphate

A covalent bond is  described as a chemical bond that involves the sharing of electrons to form electron pairs between atoms.

The properties of covalent compounds includes:

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Answer:

Kc = [B₃]²/[A₂]³  = 0.40

Explanation:

3A₂ ⇄ 2B₃  

Given at equilibrium =>  [A₂] =2.5 and [B₃] = 2.5

Kc = [B₃]²/[A₂]³ = (2.5)²/(2.5)³ = (2.5)⁻¹ = 0.40

Answer:

No new substance is formed.

Explanation:

Answer:

I think it is True

Explanation:

Answer:

Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged).

Explanation:

Given:

(Avogadro's number= 6.022 × 10^23 mol\(^{-1}\)

Number of calcium atom= \(\frac{5.77g}{40.01g}\)× 6.022 × \(10^{23}\) \(mol^{-1}\)

= 8.677× 6.022 \(10^{22}\)

Therefore, number of moles  that are in 5.77 grams of calcium  is (8.677 × 10^22)

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Answer:Nothing

Explanation:

The answer is nothing the tempatature isnt matched with the degrees this is false

Answer: Mass is converted to the energy binding a nucleus together.

Explanation: a p e x

Mass is converted to the energy binding a nucleus together cause a mass defect.Hence , Option (C) is correct.

The actual atomic mass is less than the predicted mass calculated by adding the masses of nucleons.

This additional mass is accounted for by binding energy that is released when a nucleus is formed.

When a nucleus is formed, some of the mass is converted to energy and this results in the mass defect.

Therefore, Mass is converted to the energy binding a nucleus together cause a mass defect. Hence , Option (C) is correct.

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Answer:

The number of proton in an atom is equal to the atomic number of that element. Thus, Number of protons = Atomic number ( Z )

Answer:

Concept: Advanced Chemistry Techniques

between cold hot so i guess regular

Answer:

374oC

critical temperature (oC)

Tubes containing water at several temperatures. Note that at or above 374oC (the critical temperature for water), only water vapor exists in the tube.

I hope this helps

Answer:

Explanation:

1,2,4,

The equations that show combustion are equations A, B and D.

When we talk about combustion, the idea is that the substance would be burnt in oxygen. In other words, the combustion can be taken to be an oxidation reaction. It is an oxidation reaction in the sense that the oxidation number of the substance that is reacting with the oxygen would become increased.

When we look at the equations that we have, it is quite easy to pick out among the balanced reaction equations that are shown here the ones that has to do with the burning of the substance in oxygen and a consequent rise in the oxidation number.

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The central idea is to combat malaria, typhus, and other insect-borne human diseases among both military and civilian populations.

The full form of DDT is Dichlorodiphenyltrichloroethane.

DDT is an insecticide used in agriculture. The United States banned the use of DDT in 1972. Some countries outside the United States still use DDT to control mosquitoes that spread malaria.

It also was effective for insect control in crop and livestock production, institutions, homes, and gardens. DDT's quick success as a pesticide and broad use in the United States and other countries led to the development of resistance by many insect pest species.

DDT is:

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Answer:i thinks its A

Explanation:but who knows

Answer:

C.

Explanation:

The correct way to write the diagram of an ionic compound is:

- Use brackets by writing inside them, the symbol of each element separately.

- Draw the symbol and the number o the charge of each one, negative (-) add positive +()., in this case it is +1 for Mg (because Mg lost an electron) and -1 for O (because O won an elec).

Answer:

The equation is balanced

Explanation:

There are 3Mg,2N,12H,6O and on the other side its the same amount on the other side

correct answer is 63.22 amu.

Determining the atomic mass of an element requires calculating the weighted average of the masses of the two isotopes, taking into account their natural abundance. The atomic mass of an element is given by the formula:

Atomic mass = (mass of isotope 1 × natural abundance of isotope 1) + (mass of isotope 2 × natural abundance of isotope 2)

Inserting the values ​​given in the question gives:

Atomic mass = (62.9296 amu × 0.6915) + (64.9278 amu × (1 - 0.6915))

= 43.40 amu + 19.82 amu

= 63.22 am

Therefore, the atomic mass of the element is 63.22 amu.

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Answer:

B

Explanation:

conduction is the transfer of heat between objects that touch