when moving down a column in the periodic table, which of the following increases

A. atomic mass
B. atomic number
C. group number
D. atomic mass and atomic number​

Answer:

has

Explanation:

has

Answer:

has

Explanation:

To calculate the amount of silver that will precipitate, we need to use Faraday's laws of electrolysis, which relate the substance produced or consumed in a cell to the amount of electric charge passed through it.

The first law of electrolysis states that the amount of substance produced or consumed in an electrolytic cell is proportional to the amount of electric charge passed through the cell. The proportionality constant is known as the Faraday constant, which is equal to 96,485 coulombs per mole of electrons.

The second law of electrolysis states that the amount of different substances produced or consumed in an electrolytic cell is proportional to their respective chemical equivalents.

In this problem, the substance being produced is silver, which has a chemical equivalent of 1 (i.e., one mole of electrons produces one mole of silver). The electric charge passed through the cell can be calculated as follows:

electric charge = current x time

electric charge = 5 A x 2.5 hours x 3600 s/hour

electric charge = 45,000 C

The amount of silver that will precipitate can be calculated using the first law of electrolysis and the Faraday constant:

moles of silver = electric charge / Faraday constant

moles of silver = 45,000 C / 96,485 C/mol

moles of silver = 0.467 mol

To convert moles of silver to mass, we need to know the molar mass of silver. The molar mass of silver is 107.87 g/mol. One teaspoon is approximately 5 mL.

mass of silver = moles of silver x molar mass

mass of silver = 0.467 mol x 107.87 g/mol

mass of silver = 50.4 g

number of teaspoons = mass of silver / (density of silver x volume of teaspoon)

Assuming the density of silver is 10.5 g/mL, we get:

number of teaspoons = 50.4 g / (10.5 g/mL x 5 mL)

number of teaspoons = 0.96 teaspoon

Therefore, approximately 0.96 teaspoons of silver will precipitate.

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Answer:

force of gravity 1.2 N

Explanation:

dont know for sure but here's what I got

A drop of ink will spread faster as higher the temperature is. The higher the temperature, the more agitated the molecules will be, so they will move faster. So the mobility of the particles is related to their temperature.

So:

Particles in Flask C show the greatest mobility of the particles, this flask will have the highest temperature.

Particles in Flask A show the least mobility, this flask will have the lowest temperature.

Answer:

Flask A 10°C

Flask B 25 °C

Flask C 50 °C

The mobility of the particles is related to their temperature. The particles in Flask A show the least mobility, and the particles in Flask C show the greatest mobility.

Answer:

B

Explanation:

The warmer the water, the more space it takes up, and the lower its density.

Answer:

The density decreases

Explanation:

The colder the water the closer the particles move together making it denser. The hotter the water the more the particles slow down and move away from each other making the water less dense.

The new volume when the pressure and temperature are changed to STP is 2278.17 cm³.

Given,

V = 1 L = 1000 cm³

P = 1900 mm Hg

T = 27°C = 273 + 27 = 300 K

At STP,

P₁ = 760 mm Hg

V₁ = ?

T₁ = 273 K

By gas equation,

(PV) / T = (P₁V₁) / T₁

Substituting the values we get,

(1900 × 1000) / 300 = (760 × V₁) / 273

⇒ 1900000 / 300 = V₁ × (760 / 273)

⇒ 6333.34 = 2.78 V₁

⇒ V₁ = 6333.34 / 2.78 cm³

⇒ V₁ = 2278.17 cm³

Hence, the new volume at STP is 2278.17 cm³.

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The energy of the photons emitted by this laser is 1.96 eV.

The energy of the photons emitted by a helium-neon laser is determined by the energy difference between the two excited states in neon involved in the transitions. In this case, the energy difference between the two excited states is:

ΔE = E₂ - E₁ = (18.70 eV) - (20.66 eV) = -1.96 eV

where E₁ is the energy of the lower excited state and E₂ is the energy of the higher excited state.

Since the energy of a photon is given by:

E = hν

where h is Planck's constant and ν is the frequency of the photon, we can use the energy difference ΔE to find the frequency of the emitted photons:

ΔE = hν

ν = ΔE / h

Substituting the value of ΔE and Planck's constant:

ν = (-1.96 eV) / (4.136 × 10^-15 eV s) = 4.74 × 10^14 Hz

Finally, we can use the frequency of the emitted photons to find their energy:

E = hν = (4.136 × 10^-15 eV s) × (4.74 × 10^14 Hz) = 1.96 eV

Therefore, the energy of the photons emitted by a helium-neon laser with transitions between the two excited states in neon at 20.66 eV and 18.70 eV above ground is 1.96 eV.

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The Grignard reagent needed to convert 2-pentanone to 3-methyl-3-hexanol is propylmagnesium bromide. The reaction is as follows:

Grignard reagents are organometallic reagents prepared from alkyl halides (R-X) and magnesium metal (Mg). They are used to synthesize alcohols by reacting with carbonyl compounds (C=O). The general reaction mechanism of a Grignard reagent with a carbonyl compound is as follows:

R-MgX + C=O → R-C(O)-OMgX → R-C(O)-OH,

where R represents the organic part of the reagent.

The reaction of 2-pentanone with propylmagnesium bromide will produce 3-methyl-3-hexanol as shown below:

Answer: Propylmagnesium bromide

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Answer:

D. Thermal conduction is blocked by the flip-flops.

Explanation:

Convection is a process of heat transfer which involves fluids( liquid or gas). This however rules convection out of the answer.

Radiation involves heat transfer from the sun to bodies on earth.

Conduction involves heat transfer between two solid bodies. Hot beach sand and flip-flops are solid bodies which validates thermal(heat) conduction.

Answer:  A) Bent or angular, polar

Explanation:

The central atom oxygen has two lone pairs and two bond pairs in \(OF_2\). The number of electron pairs are 4,  that means the hybridization will be \(sp^3\) and the electronic geometry of the molecule will be tetrahedral. But as there are two lone pair of atoms around the central oxygen atom, repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent shape.

The compound \(OF_2\) is polar as the net dipole moment of oxygen - fluoride bonds do not cancel each other out.

Molarity is the amount of solute in 1L of solution while percent by mass is the ratio of the mass solute to the mass of solution multiplied by 100. Both quantities are used measure the amount of solute in solution.

The question is incomplete however, I will try to explain molarity and percent by mass.

The term molarity means the number of moles of a substance is 1 L of solution while the percent by mass is the ratio of the mass solute to the mass of solution multiplied by 100.

Both molarity and percent by mass shows the amount of solute in a solution.

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Answer:

Both are ratios of the amount of solute over the amount of solution/

Explanation:

took test.

Answer:

An element is a pure substance that cannot be broken down by any physical or chemical means.

A component that is not converted into another substance is known as an element. Each of the approximately 100 elements has a unique form of atom. Atoms with even more metals are present in the universe.

A chemical element is uniquely defined by its atoms, which are tiny pieces of substance. An atom is made up of a core nucleus and one or perhaps more negative charged electrons that orbit it. One or much more moderately heavy particles are present in the positive- charged nucleus.

The atom is made up of a small nucleus and orbiting electrons. Protons are found in the nucleus and have a dipole moment that is equivalent to the electron's electrostatic repulsion. Neutrons may also be present in the nucleus.

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To determine the molar concentration of the sodium thiosulfate (Na₂S₂O₃) solution, we can use the concept of stoichiometry. Therefore, the molar concentration of the Na₂S₂O₃solution is 0.015 M.

The balanced chemical equation for the reaction between KIO₃ and Na₂S₂O₃.

The balanced equation for the reaction is as follows:

2Na₂S₂O₃+ 2KI + H₂O -> Na₂S₄O₆ + 2KOH + I2

From the balanced equation, we can see that the ratio ofNa₂S₂O₃to KIO₃ is 2:1.

Given:

Volume of KIO₃solution = 25 mL = 0.025 L

Molar concentration of KIO₃ solution = 0.0104 M

Volume of Na₂S₂O₃ solution = 17.27 mL = 0.01727 L

To find the molar concentration of Na₂S₂O₃ we can use the following formula:

Molarity of KIO₃ x Volume of KIO₃ solution = Molarity of Na₂S₂O₃ x Volume of Na₂S₂O₃ solution

0.0104 M x 0.025 L = Molarity of Na₂S₂O₃ x 0.01727 L

Rearranging the equation to solve for the molarity of Na₂S₂O₃:

Molarity of Na₂S₂O₃= (0.0104 M x 0.025 L) / 0.01727 L

Molarity of Na₂S₂O₃ = 0.015 M

Therefore, the molar concentration of the Na₂S₂O₃ solution is 0.015 M.

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Answer:

I catalyst promoter is the answer

Answer:

58.44 g/mole

Explanation:

To calculate the molar mass of NaCl (sodium chloride), we need to find the sum of the atomic masses of sodium (Na) and chlorine (Cl) off the periodic table.

Atomic mass of Na = 22.99 g/mol

Atomic mass of Cl = 35.45 g/mol

Molar mass of NaCl = Atomic mass of Na + Atomic mass of Cl

= 22.99 g/mol + 35.45 g/mol

= 58.44 g/mol

Therefore, the molar mass of NaCl is 58.44 g/mol.

Answer:

CH3COOH

Explanation:

CH3COOH has the highest boiling point because it participates in the strongest intermolecular interactions. The -OH group can participate in hydrogen bonding with other -OH groups. Hydrogen bonds are very strong because they are the result of large partial positive charge on the hydrogen and large partial negative charge on the oxygen. When surrounded by other -OH groups, the partial positive charge on the hydrogen can form temporary bonds with the partial negative charge of an oxygen on another molecule. The stronger the intermolecular interactions, the more difficult they are to overcome, thus increasing the boiling point.

The strongest IMF the other molecules participate in are dipole-dipole. These interactions are not as strong as hydrogen bonding.

Answer:

A- Before the mechanic left, the molecules were moving away from each other. When she returned, they were moving around each other.

Explanation:

Brainliest?

Answer:

B A B  sorry if its wrong

Explanation:

Circuits can be connected in series or parallel but the maximum voltage is obtained in series connection, thus, light bulbs shine brightest in series connection.

A parallel circuit connection is one in which the terminals of all the components in th circuit meet at two points.

The components are parallel to each other and current flows in multiple directions.

A series connection in a circuit is one in which the terminals of the component parts in a circuit are joined end to end. Current flows in one direction.

The voltage in a series connection is the sum of all the individual cells, therefore, the light bulb in series connection shines brightest.

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Zinc-66 with atomic number 30 has 30 protons, 36 neutrons and 30 electrons.

The atomic number of an element is the number of protons in an atom of that element.

The atom of an element is made up of three subatomic particles namely; protons, neutrons and electrons.

Proton is the positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element while electron is the subatomic particle having a negative charge and orbiting the nucleus.

Neutron, on the other hand, is the subatomic particle forming part of the nucleus of an atom and having no charge. It is got by subtracting the number of protons of an atom from the mass number.

According to this question, an atom of Zinc element is said to have a mass number of 66 and atomic number 30. This suggests that the zinc atom posseses the respective number of subatomic particles as illustrated in the main answer part.

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The reaction is endothermic and absorbed N2 and O2 are reactants while NO is a product

An endothermic reaction is a chemical reaction that absorbs heat from the surroundings, resulting in an increase in the system's internal energy.

In other words, the energy of the products is greater than the energy of the reactants, and the reaction requires an input of heat to proceed. Endothermic reactions are characterized by a decrease in temperature of the surroundings.

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Yes, this statement is also true for solutions. The vapor in equilibrium with a solution will have the same composition as the solution itself.

This is due to the fact that the vapor pressure of a solvent above a solution is equal to the vapor pressure of the pure solvent at the same temperature and pressure. This is known as Raoult's law, and it states that the vapor pressure of a solution is equal to the mole fraction of the solvent multiplied by the vapor pressure of the pure solvent

The statement that the vapor in equilibrium with a pure liquid has the same composition as the liquid is referring to the fact that the vapor pressure of a solvent above a solution is equal to the vapor pressure of the pure solvent at the same temperature and pressure (Raoult's law). This means that the composition of the vapor above a solution is the same as the composition of the solution itself. This is true for both pure liquids and solutions.

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The amount of oxygen that is liberated when 50 g of potassium chlorate is heated is 19.58 g.

The balanced chemical reaction is given as:

2KClO₃ → 2KCl + 3O₃

According to the balanced chemical equation, two moles of potassium chlorate decomposes to give two moles of potassium chloride and three moles of oxygen gas.

2 × 122.55 g = 245.1 g of potassium chlorate decomposes to give 2 × 74.55 g = 149.1 g of potassium chloride and 3 × 32 g = 96 g of oxygen gas.

Thus, for 50ng of potassium chlorate, the mass of oxygen liberated = (50 g × 96 g) / 245.1 g = 19.58 g of oxygen.

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Answer:

24

Explanation:

26-2=24 because when an atoms loses 2 electrons it gains 2+ charge

Answer: Helium is an type of air that can be used to inflate balloons, balls,  and other things that require air. The carbon dioxide we breath out is similar to this helium.

Hope this helps!

The formula for the limiting reagent is Fe, and the maximum amount of iron(II) oxide that can be produced is 0.135 moles.

To determine the limiting reagent and the maximum amount of iron(II) oxide that can be produced, we need to compare the moles of each reactant and their stoichiometric ratios in the balanced equation.

The balanced equation for the reaction is:

4Fe(s) + 3O₂(g) → 2Fe₂O₃(s)

From the balanced equation, we can see that the stoichiometric ratio between iron and oxygen is 4:3. This means that 4 moles of iron react with 3 moles of oxygen to produce 2 moles of iron(II) oxide.

Moles of iron(II) oxide = min (0.270 moles of Fe, (0.579 moles of O₂) × (2 moles of Fe₂O₃ / 3 moles of O₂))

To determine the limiting reagent, we compare the moles of iron and oxygen and choose the reactant that produces the lesser moles of iron(II) oxide. In this case, we have:

Moles of iron(II) oxide produced from 0.270 moles of Fe = 0.270 moles × (2 moles of Fe₂O₃ / 4 moles of Fe) = 0.135 moles

Moles of iron(II) oxide produced from 0.579 moles of O₂ = 0.579 moles × (2 moles of Fe₂O₃ / 3 moles of O₂) = 0.386 moles

Since 0.135 moles of iron(II) oxide is less than 0.386 moles, the limiting reagent is iron.

Therefore, the formula for the limiting reagent is Fe, and the maximum amount of iron(II) oxide that can be produced is 0.135 moles.

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Answer:

diffusion

Explanation:

Diffusion can be defined as the net movement of particles from a high concentration to a low concentration. This sounds like the most plausible word in this case.

Keep in mind that this is a simplified approach, and there may be exceptions or complications depending on the specific molecule and its geometry.

What is Hybridization?

In chemistry, hybridization is the process of combining atomic orbitals to form new hybrid orbitals with different properties than the original atomic orbitals. This concept is used to explain the geometry and bonding properties of molecules.

In hybridization, the valence electrons of an atom are rearranged to form hybrid orbitals that can participate in covalent bonding. The new hybrid orbitals are formed by mixing together atomic orbitals of similar energy, such as s, p, and d orbitals.

The hybridization of the central atom in a molecule can be predicted using the following steps:

Count the number of electron pairs around the central atom, including both bonding and lone pairs.

Use the electron pair geometry to determine the hybridization of the central atom, based on the following guidelines:

For two electron pairs, the hybridization is sp.

For three electron pairs, the hybridization is sp2.

For four electron pairs, the hybridization is sp3.

For five electron pairs, the hybridization is sp3d.

For six electron pairs, the hybridization is sp3d2.

Keep in mind that this is a simplified approach, and there may be exceptions or complications depending on the specific molecule and its geometry.

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In any aqueous solution at 25°C, the ionic-product of water (Kw) is a constant value equal to 1.0 x 10⁻¹⁴ mol²/L².

Due to the auto-ionization or self-ionization of water, water molecules dissociate into hydronium ions (H₃O⁺) and hydroxide ions (OH⁻). At 25°C, the Kw is equal to 1.0 x 10⁻¹⁴ mol²/L².

This constant value of Kw plays a crucial role in understanding the acidity and basicity of aqueous solutions. It helps to establish the relationship between the concentrations of hydronium and hydroxide ions, as their product remains constant at a given temperature. The pH and pOH scales are derived from this relationship, providing a convenient method for measuring the acidity or basicity of a solution.

In summary, the ionic-product of water, Kw, remains constant at 1.0 x 10⁻¹⁴ mol²/L² for any aqueous solution at 25°C. This constant is a result of the auto-ionization of water and helps to understand the relationship between hydronium and hydroxide ions in the context of acidity and basicity.

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Answer:

no, amu of carbon is 12 . if it changes the element will change