a student made a buffer using 0.750 moles of hcn and 0.250 moles of nacn dissolved into 2.00l of solution. a) what is the ph of the buffer? b) does this buffer have a higher capacity for additions of acid or additions of base? c) how much naoh can you add before the ph will change by 1 ph unit?

Arsenic contain Three 4p electrons in the ground state, cobolt contain seven 3d electrons in the ground state, lithium contain one 2s electrons in the ground state and itrium contain five 3p electrons in the ground state.

In a quantum mechanical system, the ground state is the stationary condition with the lowest energy; this state's energy is also referred to as the system's zero-point energy. Any state with energy above the ground state is considered to be excited. An electron's lowest energy state is its ground state, or the level of energy it typically resides in.

An fundamental electric charge of -1 is present in the subatomic particle known as the electron. Due to their lack of components or substructure, electrons, which are part of the lepton particle family's first generation, are typically regarded to be elementary particles.

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Answer:

Density, D = 2g/cm^3

Explanation:

Given the following data;

Length = 2cm

Width = 3cm

Height = 2cm

Mass = 24g

Density = ?

Volume of a rectangular solid (V) = Length × Weight × Height

Therefore, V = L× W × H

Substituting the values, we have;

\(V = 2 *3 * 2 = 12\)

V = 12cm

Density can be defined as the ratio of mass to volume i.e mass all over volume.

Mathematically, \(Density = \frac{Mass}{Volume}\)

\(D = \frac{M}{V}\)

Substituting the values, we have;

\(D = \frac{24}{12}\)

Density, D = 2g/cm^3

Hence, the density of the rectangular solid is 2g/cm^3.

Answer:

1.5moles of S;

Explanation:

The reaction expression is given as:

            S +  O₂   →   SO₂

Number of moles of SO₂  = 1.5moles

From the balanced reaction expression:

              1 mole of SO₂ will be produced from 1 mole of S;

  So;      1.5moles of SO₂  will produce 1.5moles of S;

The moles of S₂ needed to produce 1.50 moles of SO₂ gas is 1.5 mol.

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

The reaction is

S +  O₂   →   SO₂

The number of moles of SO₂ is 1.50 mol

1 mole of S produce 1 mole of SO₂

Then, 1.5 mole of S will produce 1.5 SO₂

Thus, the moles are 1.5.

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Since the molecule is asymmetrical and does not have any polar bonds, the polar bonds do not contribute to a net dipole moment, resulting in a non-polar molecule. Here option D is the correct answer.

To determine whether the molecule is polar or non-polar, we need to consider its symmetry and the presence of polar bonds. A polar bond occurs when there is a significant difference in electronegativity between the atoms involved, causing an uneven distribution of charge.

If a molecule is symmetrical, meaning it has the same atoms or groups of atoms arranged symmetrically around a central atom, it will be non-polar. This is because the polar bonds cancel each other out due to the symmetry, resulting in a net dipole moment of zero.

On the other hand, if a molecule is asymmetrical, it can be polar or non-polar depending on the presence or absence of polar bonds. If there are polar bonds and the molecule is asymmetrical, the polar bonds do not cancel out, resulting in a net dipole moment and a polar molecule. However, if the molecule is asymmetrical but lacks polar bonds, the molecule will be non-polar because the absence of polar bonds prevents the formation of a net dipole moment.

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Answer:

Which of the following is NOT a property of Alkali Metals?

A) They form ions with a charge of +2.

B) They are lustrous.

C) They are extremely reactive with water.

D) They are good conductors of heat and electricity. Previous

Explanation:

The Answer is D.

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It’s A) (0.1978)(10.01) + (0.8022)(11.01)

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore option A is correct option.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Mathematically,

average atomic mass=  ∑(relative abundance x mass of isotope)

average atomic mass boron= (relative abundance boron-10  x mass of isotope boron-10)+(relative abundance boron-11  x mass of isotope boron-11 )

average atomic mass boron=(0.1978)(10.01) + (0.8022)(11.01)

Therefore option A is correct option.

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Answer:

135.80 g of Ag

Explanation:

\(40gCu *\frac{1mol Cu}{63.546g Cu} *\frac{2mol Ag}{1molCu} *\frac{107.868g Ag}{1mol Ag}\)

~ 135.80 g of Ag

Answer:

The energy of a ruby laser that produces red light with a wavelength of 5.00 × 10^-7 m is 3.98 × 10^-19 J.

Explanation:

The energy of a photon is given by the formula E = hf where h is Planck’s constant and f is the frequency of the photon. The frequency of the photon can be calculated using the formula f = c/λ where c is the speed of light and λ is the wavelength of the photon.

Substituting the given values, we get:

f = c/λ = 3.00 × 10^8 m/s / 5.00 × 10^-7 m = 6.00 × 10^14 Hz

E = hf = (6.626 × 10^-34 J s) × (6.00 × 10^14 Hz) = 3.98 × 10^-19 J

Therefore, the energy of a ruby laser that produces red light with a wavelength of 5.00 × 10^-7 m is 3.98 × 10^-19 J.

Hello again!! :)

A piano contains both mechanical and acoustic energy. Mechanical energy is created when you press a key; as a result, the strings vibrate when the hammer strikes them, producing sound.

What converts thermal energy to electrical energy?

Using a thermoelectric generator, thermal energy can be transformed into electrical energy.

What is thermal energy?

The term "thermal energy" is used a lot of different ways in physics and engineering. It may be related to a number of different physical concepts.

What is electric energy?

Electrical energy is related to forces on electrically charged particles and the motion of electrically charged particles, frequently electrons in wires.

Hence mechanical and acoustic energy is a correct answer.

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Answer:

Na

Explanation:

Answer:

It is Rb!!

for plato users

• The balanced equation for the reaction is given by:

• From the above reaction we can see that:

1 mole of ethanol (CH3Ch2OH) produces 1 mol of acetic acid(CH3COOH)

so . x mole of ethanol will produce 0.9mol of acetic acid ....(cross multiply)

xmol ethanol * 1mol acetic = 1mol ethamol* 0.9molacetic

∴ xmol ethanol = 1*0.9 /1

= 0.90 mol

• This means that, 0.90 mol of ethanol, is needed to produce 0.9mol acetic acid,.

At STP (Standard Temperature and Pressure), iodine is present in a crystalline form, whereas fluorine is in a gaseous form. Iodine is also soluble in ethanol and produces a tincture of iodine. Typically, a 2% iodine mass is present in a tincture of iodine.

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At STP, iodine (I2) is a solid crystal and fluorine (F2) is a gas. A sample of I2 at STP is held together by van der Waals forces, which are weaker intermolecular forces. On the other hand, a sample of F2 at STP is held together by much stronger intermolecular forces than I2 due to its smaller size.

Therefore, F2 has stronger intermolecular forces than I2. It can be explained in a long answer as follows:At standard temperature and pressure, iodine (I2) is a solid crystalline substance. Its physical state is a solid because the intermolecular forces that bind the iodine molecules together are weak van der Waals forces. These forces are much weaker than chemical bonds, and they hold molecules in a condensed phase like a liquid or a solid. The forces of attraction between the iodine atoms in I2 are much weaker than the forces of attraction between the fluorine atoms in F2.

As a result, the boiling point of I2 is much lower than the boiling point of F2. F2 is a gas at STP since it is held together by much stronger intermolecular forces than I2 due to its smaller size. Fluorine has an electron density that is spread out over a larger area than iodine, making it more polarizable. The larger polarizability leads to stronger instantaneous dipoles and, as a result, stronger London dispersion forces. Since intermolecular forces are responsible for determining the physical state of a substance, F2 is a gas, whereas I2 is a solid. As a result, F2 has stronger intermolecular forces than I2.

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Answer:

36.5 g CO2

Explanation:

First, Write a Balanced Equation  

C   + 2 ZnO → CO2  + 2 Zn

Useful Information,  

MW of ZnO = 81.41 g

MW of CO2 = 44.01 g

135 g ZnO x (1 mol ZnO /  81.41 g ZnO) x (1 mol CO2/2 mol ZnO) x ( 44.01 g CO2 / 1 mol CO2 ) = 36.5 g CO2

Answer:

Endothermic is identified if the process requires heat as a reactant, since endothermic means "intake of heat", so it has to take in some type of heat.

Explanation:

Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.

Atmosphere pressure outside is higher as colder air moves in during winter. Therefore, the correct option is option A.

The definition of pressure is force/area. For instance, the weight of something like the snowfall divided by the size of the roof would represent the pressure produced snow on a roof.

Gases are often where pressure in chemistry originates from. Gas is added to a balloon before it is inflated. Gas molecules collide with one another and the balloon's walls. Car tires may appear more deflated in winter than in summer because atmosphere pressure outside is higher as colder air moves in during winter.

Therefore, the correct option is option A.

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Answer:

Strong acid

Explanation:

"An acid is a substance or compound that releases hydrogen ions (H +) when in solution. In a strong acid, such as hydrochloric acid (HCl), all hydrogen ions (H +)"

Answer:

A. two or more atoms held together with bonds make up a molecule. 

Explanation:

mark brainiest pls <3

Answer:

here is ur ans Lilly

Explanation:

hope it's helpful for you mark brainlest where you from , age

The dot and cross diagram is a way of representing a molecule along with its valence electrons and respective bonds. Valence electrons are drawn as a dot or a cross, each element will have a different connotation. Around the atoms, circles are drawn that indicate the bonds and how the electrons are shared.

Carbon has 4 valence electrons and oxygen has 6, the dot-and-cross diagram of CO2 will be:

The standard reaction enthalpy for the given reaction is +235.8 kJ/mol.

The standard reaction enthalpy (ΔH°) for the given reaction is determined as follows:

Equation of reaction: 3 Fe₂O₃ (s) → 2 Fe₃O₄ (s) + ½ O₂ (g)

The standard enthalpy of formation values for Fe₂O₃ (s), Fe₃O₄(s), and O₂(g) is used to calculate the standard reaction enthalpy.

ΔH° = [2 × ΔH°f(Fe₂O₃)] + [½ × ΔH°f(O₂)] - [3 × ΔH°f(Fe₃O₄)]

where;

ΔH°f(Fe₂O₃) = -824.2 kJ/mol

ΔH°f(Fe₃O₄) = -1118.4 kJ/mol

ΔH°f(O₂) = 0 kJ/mol

ΔH° = [2 × (-1118.4 kJ/mol)] + [½ × 0 kJ/mol] - [3 × (-824.2 kJ/mol)]

ΔH° = -2236.8 kJ/mol + 0 kJ/mol + 2472.6 kJ/mol

ΔH° = 235.8 kJ/mol

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The order of the reaction with respect to NO2 is x = 1, and the order of the reaction with respect to CO is y = 0.5.

No2 (g) + CO(g) → NO(g) + CO2(g) is the given chemical reaction to calculate the order of the reaction with respect to the following reactants according to the given experimental data as mentioned below:

Let's understand this in detail:

Order of reaction with respect to NO2:

We know that the rate of reaction is given by the formula as follows,

Rate = k[NO2]^x [CO]^yWhere,

k = Rate constant

[NO2] = Concentration of NO2

[CO] = Concentration of CO

x and y = Order of reaction with respect to NO2 and CO, respectively. The first experiment data is taken into account for calculating the order of reaction with respect to NO2 as follows:

1.44 x 10^-5 = k [0.263]^x [0.826]^y......(i)

The second experiment data is taken into account for calculating the order of reaction with respect to NO2 as follows:1.44 x 10^-5 = k [0.263]^x [0.413]^y......(ii)

Now, dividing equation (i) by equation (ii), we get

[0.826]^y/[0.413]^y = 1 => (2)^(2y) = 2 => 2y = 1 => y = 0.5

Substituting the value of y in equation (i), we get

1.44 x 10^-5 = k [0.263]^x [0.826]^0.5=> k = 0.015

Therefore, the order of the reaction with respect to NO2 is x = 1.

Order of reaction with respect to CO:

The first experiment data is taken into account for calculating the order of reaction with respect to CO as follows:

1.44 x 10^-5 = k [0.263]^x [0.826]^y......(i)

The third experiment data is taken into account for calculating the order of reaction with respect to CO as follows:

5.76 x 10^-5 = k [0.526]^x [0.413]^y......(ii)

Now, dividing equation (i) by equation (ii), we ge

t[0.826]^y/[0.413]^y = 2 => 2y = 1 => y = 0.5

Substituting the value of y in equation (i), we get1.44 x 10^-5 = k [0.263]^x [0.826]^0.5=> k = 0.015

Therefore, the order of the reaction with respect to CO is y = 0.5. Hence, the order of the reaction with respect to NO2 is x = 1, and the reaction with respect to CO is y = 0.5.

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Answer: Because sulfur is directly below oxygen in the periodic table, these elements have similar electron configurations. As a result, sulfur forms many compounds that are analogs of oxygen compounds, as shown in the table below. ... O=O. double bonds are much stronger than S=S double bonds.

Answer:

Option b) Al must be above H on the activity series.

may be this is the right answer .

Students have been studying air quality and if diagram shows molecule that contains both nitrogen and oxygen atoms, such as nitrogen dioxide (NO2), then this would be a compound molecule because it consists of both nitrogen and oxygen atoms bonded together.

Now, let's consider the particle diagrams of the five air samples provided by the teacher. The particle diagrams show the components of each air sample in terms of their atoms or molecules. To determine which three diagrams contain compound molecules, we need to look for diagrams that show molecules made up of different elements.

For example, if one of the diagrams shows only nitrogen gas (N2), this would not be a compound molecule because nitrogen gas is made up of two nitrogen atoms bonded together. Similarly, if a diagram shows only oxygen gas (O2), this would also not be a compound molecule because oxygen gas is made up of two oxygen atoms bonded together.

However, if a diagram shows a molecule that contains both nitrogen and oxygen atoms, such as nitrogen dioxide (NO2), this would be a compound molecule because it consists of both nitrogen and oxygen atoms bonded together. Other examples of compound molecules that could be present in the air samples include carbon dioxide (CO2), sulfur dioxide (SO2), and methane (CH4).

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Answer:

1.48 x 10^47 mol of Na

Explanation:

8.90 x 10^24 atoms of Na (1 mol of Na/6.022 x 10^23 atoms of Na)=

1.48 x 10^47 mol of Na