In each of the following cases, is the concentration of acid before and after dissociation nearly the same or very different? Explain your reasoning: (b) a concentrated solution of a weak acid;

Answer:

either 1 or 3

Explanation:

brain

Answer:

2.4088 x 10^24 atoms of H

Explanation:

+5

how many hydrogen atoms are in one mole of CuNH4Cl3

1 MOLECULE of CuNH4Cl3 contains 4 H atoms

1 molecules contain 2 X4 = 8 H atoms

a mole is 6.022 x 10^23 particles

1 mole of CuNH4Cl3 contains 6.022 x 10^23 molecules

so there are 4 x 6.022 x 10^23 H atoms = 24.088 x 10^23

=2.4088 x 10^24 atoms of H

2.4088 x 10^24 hydrogen atoms are in one mole of CuNH4Cl3.

An atom of the chemical element hydrogen is known as a hydrogen atom. The Coulomb force holds a single positively charged proton and a single negatively charged electron to the nucleus of the electrically neutral atom. About 75% of the universe's total baryonic mass is made up of atomic hydrogen.

Many other applications exist for hydrogen. It is used in the chemical industry to produce cyclohexane and methanol, which are intermediates in the synthesis of polymers and medicines, as well as ammonia for agricultural fertilizer (the Haber process). In the course of the oil-refining process, it is also employed to remove sulphur from fuels.

1 molecule of CuNH4Cl3 contains 4 Hydrogen atoms

1 molecule contain 2 X 4 = 8 Hydrogen atoms

1 mole is 6.022 x 10^23 particles

1 mole of CuNH4Cl3 contains 6.022 x 10^23 molecules

Then, there are 4 x 6.022 x 10^23 H atoms

= 24.088 x 10^23

Thus, 2.4088 x 10^24 hydrogen atoms are in one mole of CuNH4Cl3.

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the reported molar concentration of the sodium hydroxide solution will be too high when is used for the standardization of the naoh solution.

The term "standardization" in scientific or analytical chemistry means the process of determining standards or concentrations of a particular substance.

One of the benefits of standardization, and the most important one, is that you get results with minimal error.

.A standard solution has an accurately known concentration and for this experiment sodium hydroxide was standardized with a primary standard acid, potassium hydrogen phthalate. A primary standard could be any pure chemical that can be used as the initiation of a quantitative analysis.

If the khp is only 90% pure, the real mass of the acid will be less than weighed doing less the real moles of potassium hydrogen phthalate. Thus, in titration, volume of NaOH will be less than real volume and reported molar concentration will be too high.

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Answer:

B

Explanation:

becouse is a valintede area

Answer:

A gas is light, the molecules are moving very fast, and a gas can change forms due to temp of the area its in.

Answer:

8x8 Inc. is a provider of Voice over IP products. 8x8 products include cloud-based voice, contact center, video, mobile and unified communications for businesses.

Explanation:

it should be 50/50 percent

so 50%

hopefully this is right !

The presence of the ions in the HCl would make the solution to conduct electricity.

Because it separates into ions (H+ and Cl-) when hydrochloric acid is dissolved in water, HCl (hydrochloric acid) solution conducts electricity. The electric charge of the H+ and Cl- ions allows them to travel and convey current across the solution.

The dissociation constant (Ka) of HCl describes how much of the compound separates into ions depending on the concentration of the solution. A higher HCl concentration will produce more ions, which will increase conductivity.

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Answer:

89-91=1 the answer is 1molar mass

Answer:

acid

Explanation:

The net ionic equation focuses on the species that are directly involved in the reaction, highlighting the formation of solid calcium sulfate (CaSO4).

The reaction between sodium sulfate (Na2SO4) and calcium chloride (CaCl2) can be represented by the following balanced chemical equation:

Na2SO4(aq) + CaCl2(aq) → 2NaCl(aq) + CaSO4(s)

To write the complete ionic equation, we need to break down all the soluble compounds into their respective ions:

Na2SO4(aq): 2Na⁺(aq) + SO4²⁻(aq)

CaCl2(aq): Ca²⁺(aq) + 2Cl⁻(aq)

2NaCl(aq): 2Na⁺(aq) + 2Cl⁻(aq)

CaSO4(s): CaSO4(s)

By substituting the ions into the balanced chemical equation, the complete ionic equation is:

2Na⁺(aq) + SO4²⁻(aq) + Ca²⁺(aq) + 2Cl⁻(aq) → 2Na⁺(aq) + 2Cl⁻(aq) + CaSO4(s)

In the complete ionic equation, the ions that appear on both sides of the equation (Na⁺ and Cl⁻) are called spectator ions. They do not participate in the actual chemical reaction and can be eliminated from the equation. Simplifying the equation by removing the spectator ions gives the net ionic equation:

SO4²⁻(aq) + Ca²⁺(aq) → CaSO4(s)

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When pipes leak, the environment's air, water, soil, and climate might be harmed. When there is a lot of rain and flooding, pipes that span rivers and streams are more likely to burst.

Acid rain, deteriorating water quality, groundwater contamination, and the greenhouse effect's intensification are only a few significant environmental effects. Aside from destroying ecosystems that, in some cases, may be unique, the oil and gas industry may also be a factor in the decline of biodiversity. Drilling and milling machines have both advantages and drawbacks.

Benefits: accurate points, good feed control, and challenging to roll. Retraction's shortcomings include its lack of flexibility and inability to process large or deep holes. Furthermore, methane, a greenhouse gas 21 times more potent than carbon dioxide, is released in enormous quantities by the oil and gas sector. In total, the industry is to blame for 3.8% of all greenhouse gases, or 38% of all methane emissions in the United States.

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A reaction to be spontaneous,overall cell potential must be positive.

(A)The metabolite which would spontaneously reduce oxaloacetate (OAA) is:

alpha-ketoglutarate

(B)The two half cell reactions are as follows:

Reduction half reaction:

Oxaloacetate + 2 H+ + 2 e- --> malate

Oxidation half reaction:

alpha-ketoglutarate --> Succinate + CO2 + 2 H+ + 2 e-

Overall resulting balanced reaction for the reduction of OAA :

Oxaloacetate +alpha-ketoglutarate --> malate + Succinate + CO2

(C)the standard reduction potential for the reaction chosen in (B):

+0.67-0.17 = +0.50 V

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Answer:

3.02 Mm

Explanation:

Restorative Theory of Sleep is the best theory to explain this. This theory proposes that our bodies use sleep to help repair and restore cells, tissues, and organs.

During sleep, the body is able to produce growth hormones, repair damaged cells, and regenerate tissue. It also helps to regulate the immune system and restore energy levels. This theory explains why certain chemicals that help repair damaged cells only function while we sleep. This theory states that sleep helps restore the body and mind from the wear and tear of daily life, allowing the body to repair itself. This includes the repair of damaged cells, which can only happen while we sleep.

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Answer:

To make this easier I'll label the left column 1, 2, 3, and 4. and the right column A, B, C, and D.

1 goes to B

2 goes to A

3 goes to C

4 goes to  D

Explanation:

1. A ship goes out of sight on the horizon because it goes too far around the curve of the earth to see anymore.

2. We have day and night because the earth spins certain sides of itself to face the sun and other sides to face away from the sun (aka day and night)

3. We have summer and winter because Earth's axis is tilted. Part of the Earth tilts closer to the sun when summer is here, and the other part tilts away from the sun when it's winter. (This is why it's summer in North America, when it's winter in Australia).

4. A year is measured by how long it takes a planet to orbit it's star. A year for Earth is 365 days because it takes 365 days for earth to orbit around the sun.

Answer:

True

Explanation:

They do retain their individual properties.

The threshold frequency of light required to emit photoelectrons from K is approximately 5.31×10^14 Hz, while for Ni it is approximately 1.20×10^15 Hz.

A) The threshold frequency of light required to emit photoelectrons from K is:
ν0(K) = Work function (K) / Planck's constant
ν0(K) = (2.2 eV * 1.60×10^-19 J/eV) / 6.63×10^-34 Js
ν0(K) ≈ 5.31×10^14 Hz
B) The threshold frequency of light required to emit photoelectrons from Ni is:
ν0(Ni) = Work function (Ni) / Planck's constant
ν0(Ni) = (5.0 eV * 1.60×10^-19 J/eV) / 6.63×10^-34 Js
ν0(Ni) ≈ 1.20×10^15 Hz
To calculate the threshold frequency, we use the formula ν0 = Work function / Planck's constant, where the work function is given in eV and needs to be converted to Joules using the provided conversion factor.

Summary: The threshold frequency of light required to emit photoelectrons from K is approximately 5.31×10^14 Hz, while for Ni it is approximately 1.20×10^15 Hz.

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Answer:

Most common metals like aluminum, copper, and iron are denser than wood. The atoms that makeup metals are generally heavier than the atoms in plastic and wood and they are packed closer together.

Answer:

Jim's car travels: 12.04 meters per second.

Tara's car travels 12 meters per second.

Explanation:

Tara's car travels the fastest.

The concentration contained in 14.5 grams of ammonium nitrate that is dissolved creating 250 milliliters is 0.72M.

The molarity or concentration of a substance refers to the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

Molarity can be calculated by dividing the number of moles in a substance by its volume as follows:

Concentration = no of moles ÷ volume

14.5 grams of ammonium nitrate with a molar mass of 80.043g/mol can be converted to moles to be 0.18 moles.

molarity = 0.18 mol ÷ 0.250L = 0.72M

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Answer:

Density=1.0 g/mL

Volume=2.0 L

Mass=?

Density=mass/volume

Mass=density*volume

Mass=1.0*2.0

Mass=2g

Answer:

b) 2H+(aq) + 2C1-(aq) + Zn(s) → H2(g) + Zn2+(aq) + 2Cl-(aq)

Explanation:

The equation is given as;

2HCl(aq) + Zn(s) + H2(g) + ZnCl2(aq)

In writing an ionic equation, only the aqueous compounds dissociates into ions. This means HCl and ZnCl2 would dissociate to form ions.

This is given as;

2H+  +  2Cl-  + Zn(s) --> H2(g) + Zn2+  + 2Cl-

The correct option is;

b) 2H+(aq) + 2C1-(aq) + Zn(s) → H2(g) + Zn2+(aq) + 2Cl-(aq)

The distance to Saturn from the Sun is nearly 900 million miles, which is nearly twice the distance to Jupiter.

If the Earth were made of nickel, it would be about the same size as a volleyball. At an average distance of 1.4 billion kilometers, Saturn is about 9.5 solar masses (AU) away from the Sun.

Saturn, the 6th planet in our Solar System, orbits around the Sun at an average distance of 1.4 billion kilometers (870 million miles). Saturn's distance from the Sun is approximately 9.6x the distance from Earth. Saturn is nearly twice as far away from the sun as Jupiter, the 5th planet.

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for the following unbalanced equation.5800 kj is  the standard free energy for the reaction of 7. 2 moles of al2o3(s) at 298k

 First, let's balance the equation. Both sides must have the same amount of each element, so: Al₂O(s) + 3CO(g) 2Al(s) + 3CO2(g)

The free energy can be calculated by: AG = AH-TAS Where AH is the enthalpy of the reaction, and AS is the entropy of the reaction.

Al2O3(s): Hf=-1676.0 kJ/mol; S = 50.92 J/mol.K Al(s): Hf = 0.00; S° = 28.3 J/mol.K

CO(g): Hf=-110.5 kJ/mol; S = 197.6 J/mol.K

CO2(g): Hf=-393.5 kJ/mol; S = 213.6 J/mol.K

AH = Σn*Hf products - En*Hf reactants (n is the coefficient of the compound).

AH = (3*(-393.5) + 2*0) - (3*(-110.5) + (-1676)) = 827KJ

AS = {n*S* products - Σn*S° reactants

AS = (3*213.6 +2*28.3) - (3*197.6 + 50.92) = 53.68J/K = 0.05368 kJ/K

AG 827-298*0.05368 AG = 811 KJ

Which is the free energy for 1 mol of Al2O3

1 mol of Al2O3=811 KJ X 7.2 moles of Al2O3

By a simple direct three rule:  standard free energy is x = 5839.2 kJ = 5800 kJ

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Atomic radius generally decreases from left to right across a period because the effective nuclear charge Increases while electrons are being added to the same outer level. These additional electrons are shielded less well by inner electrons and are therefore attracted more strongly by the nucleus. .

In the periodic table, atomic radii generally decrease as you move left to right across the period (because the nuclear charge increases) and increase as you move down the group (because the number of electron shells increases).

As the attractive force between the nucleus and the electron increases, the size of the atom decreases. This effect diminishes as you move further to the right within the cycle. This is due to repulsion between electrons that would otherwise cause the atoms to increase in size.

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