as you move from left to right across the second period of the periodic table responses ionization energy increases. ionization energy increases. atomic mass decreases. atomic mass decreases. atomic radii increases. atomic radii increases. electronegativity decreases. electronegativity decreases.

Answer:

The probability of Janie to have blonde hair would be a slim 13% to a 34%.

Explanation:

Not 100% sure but best estimation I can come up with.

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

Answer:

Question1: Isotopes, element, protons, neutrons. Question 2: W and Y

Explanation:

An Isotope is atoms of the same element that have a different amount of neutrons.

Both are Carbon atoms, but their Atomic Masses are different, and Atomic Masses are made up of Protons and Neutrons, which proves this!

Hope this helps! :D

Answer:

Sulfite contains 3 oxygens and sulfate contains 4 oxygens

Explanation:

Answer:

Explanation:

molar volume=moles*given volume

for molar concentration we use two formulas molarity and molality

molarity=no of moles/volume

molality=no of moles/kilogram

Explanation:

The barium – 137 cation would have 56 protons, 54 electrons and 81 neutrons.

the equilibrium constant for the given reaction at 298 K is 8.96 x 10^-7.

The equilibrium constant for the given reaction, CIO(g) + O2(g) → Cl(g) + O3(g), at 298 K can be determined using the Gibbs free energy of the reaction and the following equation:ΔG° = - RT lnK

where ΔG° is the standard Gibbs free energy change, R is the gas constant, T is the temperature in Kelvin, and K is the equilibrium constant.

The equation can be rearranged to solve for K:K = e^(-ΔG°/RT)where e is the natural logarithmic base, and all other variables are the same as in the previous equation.Substituting the given values,

we have:ΔG° = 34.5 kJ/molR = 8.314 J/(mol·K)T = 298 K

Using these values, we get:-

ΔG°/RT = (-34.5 × 10^3 J/mol) / (8.314 J/(mol·K) × 298 K)

= -13.19e^(-ΔG°/RT) = e^(-13.19) = 8.96 × 10^-7

Therefore, the equilibrium constant for the given reaction at 298 K is 8.96 x 10^-7.

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Answer:

The number of electrons is equal to the number of protons

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the electrons number  is equal to the number of protons in the atom.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. In an atom, the number of electron or atomic number is s equal to the number of protons in the atom.

Therefore, the electrons number  is equal to the number of protons in the atom.

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When 9.40 g of Boron trifluoride and 39.7 g of ammonia are placed in a reaction vessel, the limiting reactant is Boron trifluoride. The reaction forms 14.9 g of the product F3B-NH3.d.

Explanation: To determine how many grams of the product are formed, first, we need to find the limiting reactant.

The molar mass of BF3 is 67.81 g/mol, and the molar mass of NH3 is 17.03 g/mol. Next, we'll calculate the moles of each reactant:
Moles of BF3 = 9.40 g / 67.81 g/mol = 0.1386 mol
Moles of NH3 = 39.7 g / 17.03 g/mol = 2.331 mol
The reaction ratio of BF3 to NH3 is 1:1, so the limiting reactant is BF3 (0.1386 mol) since it is in a smaller amount. Now, we'll determine the moles of the product (F3B-NH3) formed:
Moles of F3B-NH3 = 0.1386 mol
Finally, we'll convert moles of the product to grams using its molar mass (84.84 g/mol):
Grams of F3B-NH3 = 0.1386 mol * 84.84 g/mol = 14.9 g

Summary: When 9.40 g of Boron trifluoride and 39.7 g of ammonia are placed in a reaction vessel, the limiting reactant is Boron trifluoride. The reaction forms 14.9 g of the product F3B-NH3.

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Answer:

2

Explanation:

Electron

Answer:

All answers stated below:

Explanation:

1. Plate Tectonics

2. lithosphere

3. asthenosphere

4. divergent boundary

5. (not sure)

6. convergent

7. transform

8. convection

The "standard" Diels-Alder reaction works best with an electron-rich diene with an electron-poor dienophile, as this combination allows for efficient electron transfer and bond formation.

The Diels-Alder reaction is a type of cycloaddition reaction that involves the formation of a cyclic product from a diene and a dienophile. In this reaction, the diene acts as a nucleophile, donating a pair of electrons to the electron-deficient dienophile, which acts as an electrophile.

The electron-rich diene has a high electron density and can donate its electrons to the electron-deficient dienophile, leading to the formation of a new carbon-carbon bond. In contrast, an electron-poor diene has a low electron density and cannot donate its electrons effectively to the dienophile, making the reaction less favorable.

Likewise, an electron-poor dienophile is more attractive to the electron-rich diene due to its electron deficiency and can easily accept the electrons from the diene to form a new bond. In contrast, an electron-rich dienophile would have a higher electron density and would be less electrophilic, making it less likely to react with the electron-rich diene.

Therefore, the "standard" Diels-Alder reaction works best with an electron-rich diene with an electron-poor dienophile, as this combination allows for efficient electron transfer and bond formation.

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Answer:

A

Explanation:

because your body needs to have an intake in the volume of liquids, and when you sweat it secretes the water from your body

The temperature of water vapour rises as a result of the water molecules' increased kinetic energy, which makes them travel more quickly and collide more frequently, raising the temperature.

When the heat is raised (as occurs when water boils, for example), the hydrogen bonds between the water molecules completely disintegrate, allowing the water molecules to escape as gas into the air.

Moreover, as gas molecules exit the liquid, the liquid loses thermal energy. As a result, the liquid's temperature doesn't change when it boils. For instance, water will continue to boil at 100°C (at a pressure of 1 atm or 101.3 kPa).

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Answer:

5.22 x 10^-5

Explanation:

5.22 x 10^-3 x 10^-2 = 5.22 x 10^-5

The volume of NaOH needed to reach the equivalence point if the concentration of the added base were 0.160 M is 31.25 mL.

The pH titration curve of 50 mL of 0.100 M solution of HCl.

The strong base react with HCl gives:

NaOH  +  HCl   ----->   NaCl   +   H₂O

it is clear fron the above equation that 1 mole of HCl react with 1 mole of NaOH

number of mole of NaOH = number of mole of HCl

number of moles of HCl =  volume in L × Molarity

                                        = 0.050 × 0.100

                                        = 0.005 moles

Therefore, moles of NaOH = 0.005 moles

volume of NaOH = moles / molarity

                             = 0.005 / 0.160

                             = 0.03125 L = 31.25 mL

Thus, The volume of NaOH needed to reach the equivalence point if the concentration of the added base were 0.160 M is 31.25 mL.

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The mass of the 2.34 × 10²³ atoms of copper is equal to 24.68 grams.

The Avogadro constant can be defined as the proportionality factor that the number of constituent particles in a sample with the amount of substance.

Avogadro’s number can be described as a dimensionless number that represents the number of entities in one mole of any substance. These elementary entities can be molecules, atoms, ions, electrons, or protons, etc.

Avogadro’s constant has a value approximately equal to 6.022 × 10²³ mol⁻¹.

Given, the number of atoms of copper = 2.34 × 10²³

The atomic mass of Cu Copper = 63.5 g/mol

So 6.022 × 10²³ atoms of Cu have mass = 63.5 g

Then 2.34 × 10²³  Cu atoms will have mass = \(\frac{63.5 \times 2.34 \times 10^{23}}{6.02 \times 10^{23}}\) = 24.68 g

Therefore, 24.68 grams of Cu are there in 2.34 × 10²³ atoms of Cu.

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Answer: 31.5L

Explanation:

Ideal gas law is valid only for ideal gas not for vanderwaal gas. The equation used is PV=nRT. Therefore the volume of oxygen gas is 31.5L.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of oxygen gas =78.5 kPa=78,500=0.7747atm

V= volume of oxygen gas=?

n =number of moles of oxygen gas = given mass÷ Molar mass

                                                          = 32.0g÷ 32

                                                          =1 mole

T =temperature of oxygen gas=298K

R = Gas constant = 0.0821 L.atm/K.mol

0.7747atm×V=1 mole×0.0821×298K

V=31.5L

Therefore the volume of oxygen gas is 31.5L.

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The solubility product is 4x\(10^{-6}\) and 3x\(10^{-8}\) and the pH value is 12.35

The molar solubility of \(PbBr_{2}\) at 25 oC is 1.0 x \(10^{-2}\) \(\frac{mol}{L}\). to calculate the  molar solubility = 1.0 x \(10^{-2}\) \(\frac{mol}{L}\)

\(PbBr_{2}- > Pb^{2}+2Br^-\)

Concentration of \(Pb^{+2}\)= \(1.10^{-2}\) \(\frac{mol}{L}\)

Concentration of \(Br^-\)= 2 x 1 x \(10^{-2}\) \(\frac{mol}{L}\) = 2 x \(10^{-2}\) \(\frac{mol}{L}\)

\(K_{sp}\) = [\(Pb^{+2}\)][\(Br^-\)]2 = [( 1 x \(10^{-2}\))( 2 x \(10^{-2}\))2] = 4 x \(10^{-6}\)

\(K_{sp}\) = 4 x \(10^{-6}\)

Now 0.0490 g of \(AgIO_3\) dissolves per liter of solution, and for the solubility-product constant.

We have, molar mass of \(AgIO_3\) = 283 g/mol

On solving

0.0490 g = \(\frac{0.049}{283}\)=1.731x \(10^{-4}\) moles

\(K_{sp}\) = [\(Ag^+\)][\(IO^{3-}\)] = (1.731 x \(10^{-4}\)) = 3 x \(10^{-8}\)

\(K_{sp}\) = 3 x \(10^{-8}\)

Now use the \(K_{sp}\) value from , for the pH of a saturated solution of \(Ca(OH)_{2}\).

\(Ca(OH)_{2} - > Ca^{+2}+2OH^{-}\)

\(K_{sp}\) = [\(Ca^{+2}\)][\(OH^-\)][\(OH^-\)] = s x \((2s)^2\) = 4\(s^{3}\)

5.5 x \(10^{-6}\)= 4\(s^{3}\)

s = 1.11 x \(10^{-2}\)M

[OH] = 2s = 2 x 1.11 x \(10^{-2}\) M = 2.22 x \(10^{-2}\) M

p(OH) = -log(OH) = -log(2.22 x \(10^{-2}\) M) = 1.65

pH = 14- pOH = 14- 1.65 = 12.35

pH = 12.35

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Los principales mecanismos de contaminación en el medio ambiente son los procesos industriales que implica combustión,tanto en industrias como automóviles o calefacciones residenciales,que generan dióxido y monóxido de carbono, óxidos de nitrógeno y azufre,entre otros contaminantes.

The temperature of gas with all the given conditions comes out to be 1002.94 °C.

Given to us is

P = 5.2672 atm

V = 15.732 L

n = 4.3054 mol

R = 0.0821 L·atm/(mol·K)

To calculate the temperature of the gas, we can use the ideal gas law equation:

PV = nRT

Where:

P = pressure of the gas

V = volume of the container

n = number of moles of gas

R = ideal gas constant

T = temperature of the gas

First, let's rearrange the equation to solve for T:

T = (PV) / (nR)

Now, we can substitute the values into the equation and calculate T:

T = (5.2672 atm × 15.732 L) / (4.3054 mol × 0.0821 L·atm/(mol·K))

T = 1276.0909 K

To convert the temperature to degrees Celsius, we subtract 273.15:

T = 1276.0909 K - 273.15

T = 1002.94 °C

Therefore, the temperature of the gas is approximately 1002.94 °C.

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Explanation:

37x - 1 + 23x + 1 = 180 ° { being co-interior angles }

60x = 180°

x = 180°/ 60

x = 3 °

Now

< T = 37x - 1° = 37 * 3° - 1 = 110°

Hope it will help :)

The mass defect of the oxygen nucleus is 16 8o 816o. the mass of neutral 16 8o 816o is equal to 15.994914 atomic mass units

8(1.008665)+8(1.007825)

=16.13192

16.13192-15.994914

=.13701 amu

The atomic nucleus is a small, dense region made up of protons and neutrons at the center of an atom, discovered by Ernest Rutherford in 1911, based on Geiger-Marsden's gold leaf experiment in 1909. After the discovery of the neutron in 1932, models of the nucleus composed of protons and neutrons were rapidly developed by Dmitri Ivanenko[1] and Werner Heisenberg. I was.

The cell nucleus carries genes, structures that control and regulate cell activity (such as growth and metabolism) and contain genetic information. Nucleoli are small bodies commonly found within the nucleus. The nucleoplasm is the gel-like matrix in which the core components are suspended.

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Chemicals are not supposed to be poured down the drain.

Chemicals should not be poured down the drain. This can cause harm to the plumbing system, sewage treatment plants, and the environment. Dispose of household chemicals properly by taking them to a designated recycling center or household hazardous waste collection event.

Thus the action that have been undertaken by Thomas and Trenton  is quite wrong since the chemicals that they have poured down the drain could lead to an environmental hazard.

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Answer:

Explanation:She was wrong

When the carbonic acid sodium bicarbonate buffer pair buffers lactic acid, the following reaction occurs:$$\text{HCO}_3^- + \text{H}^+ \leftrightarrow \text{H}_2\text{CO}_3$$The carbonic acid/bicarbonate buffer system is one of the most important in human blood. When the pH of the blood decreases (becomes more acidic), the amount of bicarbonate ions in the blood decreases, and the concentration of hydrogen ions increases.

A buffer is a solution of a weak acid and its conjugate base that prevents changes in pH when small amounts of strong acid or base are added. Buffer systems protect organisms from pH changes by regulating and neutralizing acids and bases that enter or are produced by cells.

When the carbonic acid sodium bicarbonate buffer pair buffers lactic acid, the following reaction occurs:$$\text{HCO}_3^- + \text{H}^+ \leftrightarrow \text{H}_2\text{CO}_3$$The carbonic acid/bicarbonate buffer system is one of the most important in human blood. When the pH of the blood decreases (becomes more acidic), the amount of bicarbonate ions in the blood decreases, and the concentration of hydrogen ions increases. To balance the excess hydrogen ions, carbonic acid (H2CO3) is formed from carbon dioxide (CO2) and water (H2O). Carbonic acid then decomposes to form bicarbonate ions and hydrogen ions, and the pH of the blood is returned to normal. The bicarbonate ions act as a base, neutralizing the excess hydrogen ions that cause the blood to become more acidic. This is called the bicarbonate buffer system. Lactic acid is produced during intense exercise when the body doesn't get enough oxygen to meet its energy needs. The buildup of lactic acid in muscles can cause fatigue and muscle soreness. The carbonic acid/bicarbonate buffer system can also help to buffer the excess lactic acid produced during exercise, preventing the blood from becoming too acidic.

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Considering the definition of mass volume percentage, a mass of NaCl of 45 grams is required to prepare 60ml of a 75% solution.

A mass volume percentage is a ratio of the mass of a solute to the volume of the solution, expressed as a percentage. The mass/volume percentage is calculated as the mass of solute divided by the volume of solution:

mass volume percentage= (mass of solute÷ volume of solution)×100%

In this case, you know:

Replacing in the definition of mass volume percentage:

75% grams/mL= (mass of solute÷ 60 mL)×100%

Solving:

75% grams/mL÷100%= mass of solute÷ 60 mL

0.75 grams/mL= mass of solute÷ 60 mL

0.75 grams/mL×60 mL= mass of solute

45 grams= mass of solute

Finally, a mass of NaCl of 45 grams is required.

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a) To find the stopping potential, we can use the formula:

K_max = eV_s

where K_max is the maximum kinetic energy of the ejected electrons, e is the charge on an electron, and V_s is the stopping potential. We can use the fact that the energy of a photon of light is given by:

E = hc/λ

where h is Planck's constant, c is the speed of light in a vacuum, and λ is the wavelength of the light. The work function, W, is the minimum energy required to eject an electron, and is related to the threshold frequency, f_0, by:

W = hf_0 = hc/λ_0

where λ_0 is the threshold wavelength.

For potassium, the work function is given as 2.3 eV. We can convert this to joules using:

1 eV = 1.60×10^-19 J

so W = 2.3 eV x 1.60×10^-19 J/eV = 3.68×10^-19 J.

The threshold wavelength, λ_0, can be found by rearranging the formula for the energy of a photon:

λ_0 = hc/W = (6.63×10^-34 J⋅s x 3.00×10^8 m/s)/(3.68×10^-19 J) = 5.39×10^-7 m

The threshold frequency, f_0, can be found using the formula:

f_0 = c/λ_0 = 3.00×10^8 m/s / 5.39×10^-7 m = 5.57×10^14 Hz

Now we can find the energy of a photon with wavelength λ = 210 nm = 210×10^-9 m:

E = hc/λ = (6.63×10^-34 J⋅s x 3.00×10^8 m/s)/(210×10^-9 m) = 2.99 eV

To find the stopping potential, we subtract the work function from the energy of the photon:

V_s = (E - W)/e = (2.99 eV - 3.68×10^-19 J)/(1.60×10^-19 C) = -0.425 V

Rounding to two significant figures, we get:

Stopping potential = -0.43 V

b) The kinetic energy of the most energetic electrons ejected is given by:

K_max = E - W = 2.99 eV - 2.3 eV = 0.69 eV

Converting to joules, we get:

K_max = 0.69 eV x 1.60×10^-19 J/eV = 1.10×10^-19 J

c) The speed of the electrons can be found using the formula:

K_max = 1/2 mv^2

where m is the mass of an electron and v is its speed. Solving for v, we get:

v = √(2K_max/m)

The mass of an electron is 9.11×10^-31 kg, so:

v = √(2(1.10×10^-19 J)/(9.11×10^-31 kg)) = 6.61×10^5 m/s

Rounding to two significant figures, we get:

Speed of electrons = 6.6×10^5 m/s

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The expected effects on the people if the alpine and the tidewater glaciers melted is the melting the glaciers add to the rising sea levels.

The melting glaciers add to the rising sea levels, which in the turn will increases the coastal erosion and the elevates storm to surge the warming air and the ocean temperatures that will create the more frequent and the intense coastal storms such as the hurricanes and the typhoons.

The glaciers has been the melting for the decades because of the climate warming and therefore the monitoring of it is very important. The melting of the alpine and the tidewater glacier rises the sea level.

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