question content area if the original sample of zn had a mass of 1.4 g, what mass of zncl2 can be produced in the reaction?

Answer:

Period, 4, Boiling point, 2913°C, 5275°F, 3186 K ; Block, d, Density (g cm−3), 8.90 ; Atomic number, 28, Relative atomic mass, 58.693.

Element Uranium (U), Group 20, Atomic Number 92, f-block, Mass 238.029. Sources, facts, uses ... Group, Actinides, Melting point, 1135°C, 2075°F, 1408 K.

krypton ; atomic weight, 83.798 ; melting point, −157.4 °C (−251.3 °F) ; boiling point, −153.4 °C (−244.1 °F) ; density (1 atm, 0 °C [32 °F]), 3.733 g/litre

Water boils at 100 Degrees Celsius or 212 degrees Fahrenheit

The equation that represents the second ionization of magnesium is option  D: Mg(g) + 2e- → Mg2+(g).

In the first ionization of magnesium, one electron is removed from the neutral magnesium atom to form a magnesium cation, Mg+. In the second ionization, another electron is removed from the magnesium cation to form a magnesium dication, Mg2+. The equation for this process is D, Mg(g) + 2e- → Mg2+(g).

Option A, Mg+(g) → Mg2+(g) + e-, represents the formation of a magnesium cation from a magnesium dication and an electron, which is the reverse process of the second ionization.

Option B, Mg(g) → Mg2+(g) + 2e-, represents the formation of a magnesium dication from a neutral magnesium atom, which is the correct process for the second ionization.

Option C, Mg+(g) + e- → Mg2+(g), represents the formation of a magnesium dication from a magnesium cation and an electron, which is not a second ionization.

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Answer:

Option D, 116 g of NaNO3

Explanation:

An unsaturated solution is the one in which the amount of salt dissolved in more than the maximum amount of salt that can be dissolved in it.

At 50 degree Celsius, 37 grams of salt can be dissolved in 100 ml of water. Hence, 116 gram of salt is the correct answer

The first shell of an atom is its electron shell, or energy level.

The subshell is the second shell.

The particular orbital (or "cloud") within that subshell is the third shell.

The position and energy of an electron in an atom are represented by a set of numbers known as quantum numbers.

principal quantum number

azimuthal quantum number

magnetic quantum number

The electron shell, also known as the atom's energy level, is the initial shell. The value of N ranges from 1 to the atom's outermost electron's shell.

By using the connection, the second shell, which is the subshell, determines the magnitude of the orbital angular momentum.

The third shell creates the orbital angular projection momentum along a certain axis and is the particular orbital (or "cloud") within that subshell.

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Explanation:

because they have more protons

The hcl(aq) solution has a lower concentration than what is indicated on the reagent bottle. This will result in fewer moles of base in the antacid.

What is the HCI solution's concentration?

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The valence states provided are general representations and may vary depending on specific conditions and coordination environments.

a. Uvarovite: The mineral formula for uvarovite is Ca3Cr2(SiO4)3. In this formula, the valence state of calcium (Ca) is +2, the valence state of chromium (Cr) is +3, and the valence state of silicon (Si) is +4. Oxygen (O) is usually assigned a valence state of -2.

b. Azurite: The mineral formula for azurite is Cu3(CO3)2(OH)2. In this formula, the valence state of copper (Cu) is +2, carbonate (CO3) has a valence state of -2, and hydroxide (OH) has a valence state of -1.

c. Cuprite: The mineral formula for cuprite is Cu2O. In this formula, the valence state of copper (Cu) is +1, and oxygen (O) is usually assigned a valence state of -2.

d. Gypsum: The mineral formula for gypsum is CaSO4·2H2O. In this formula, the valence state of calcium (Ca) is +2, sulfur (S) has a valence state of +6, and oxygen (O) is usually assigned a valence state of -2. The water molecules (H2O) do not have a net charge.

e. Galena: The mineral formula for galena is PbS. In this formula, the valence state of lead (Pb) is +2, and sulfur (S) has a valence state of -2.

It's important to note that the valence states provided are general representations and may vary depending on specific conditions and coordination environments.

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Ka = [Cl3CCOO⁻] [H⁺] / [Cl3CCOOH] = 0.3

Ka = [C6H5 -NH2] [H30⁺] / [C6H5-NH3⁺] = 2.51ₓ10⁻⁵

Ka = [Cu (OH3)] ⁻[H⁺] ³/[Cu²⁺] = 3ₓ10⁻⁸

To know if a substance will act as an acid or a base in a reaction, we look at the functional group.

How to find acidic strength?

trichloroacetic acid (and carboxylic acids in general) have carboxylic group - O- H which dissociates into aqueous solution into COO⁻ + H+ ions. Since it gives protons in aqueous solution, it acts as an acid

Amines Ar -NH are bases. They react with water to produce hydroxide ions.

Protonated amine is the conjugate acid. It reacts with water to provide

Cu2+ reacts with water to provide protons. Hence, Cu2+ acts as an acid.

Among trichloroacetic acid, anilinium ion and Cu2+ ion, Ka value is maximum for trichloroacetic acid. Hence, trichloroacetic acid is the strongest acid.

Note: Higher is the Ka value, greater is the acid strength.

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Answer: Ions are formed by the addition of electrons to, or the removal of electrons from,

Explanation:

The equation below is photosynthesis .

6CO₂ + 6H₂O → \(C_{6} H_{12} O_{6}\) + 6O₂

Water and carbon dioxide are converted into food by the process of photosynthesis , which occurs in the presence of sunlight in plants and photosynthetic bacteria . They create oxygen as a byproduct and glucose as the food . The photosynthesis equation is given as ,

6CO₂ + 6H₂O → \(C_{6} H_{12} O_{6}\) + 6O₂

This indicates that the reactants, six carbon dioxide molecules and six water molecules, are transformed into a sugar molecule and six oxygen molecules, the products, by light energy being absorbed by chlorophyll (implied by the arrow).

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Answer:

360mL is 360 cc

Explanation:

1 ml to cc = 1 cc

Answer:

Chemical because water + metal = rust.

Explanation:

A new substance was formed.

The pH of a solution containing 0.085 M nitrous acid (HNO2; Ka = 4.5 x 10-4) and 0.10 M potassium nitrite (KNO2) can be calculated using the principles of acid-base equilibrium.

1. The solution will be slightly acidic, and the pH value can be determined by the concentration of H+ ions resulting from the ionization of nitrous acid.

2. The pH of the solution can be calculated by considering the ionization of nitrous acid and the hydrolysis of the nitrite ion. Nitrous acid (HNO2) partially ionizes in water to form hydronium ions (H3O+) and nitrite ions (NO2-). This ionization can be described by the equation: HNO2 ⇌ H+ + NO2-.

3. The equilibrium constant for this reaction is given by the acid dissociation constant (Ka) for nitrous acid, which is 4.5 x 10-4. Since the concentration of HNO2 is 0.085 M, we can assume that x moles of HNO2 ionize, resulting in x moles of H+ ions and x moles of NO2- ions. Therefore, the concentration of H+ ions can be approximated as x M.

4. The nitrite ions (NO2-) from the potassium nitrite (KNO2) can undergo hydrolysis in water to produce hydroxide ions (OH-) according to the reaction: NO2- + H2O ⇌ HNO2 + OH-

5. Since the concentration of KNO2 is 0.10 M, we can assume that x moles of NO2- ions hydrolyze, resulting in x moles of HNO2 and x moles of OH- ions. Therefore, the concentration of OH- ions can be approximated as x M.

6. To determine the pH, we need to calculate the concentration of H+ ions in the solution. Since the reaction of nitrous acid and the hydrolysis of nitrite ions occur simultaneously, we need to consider their combined effect on the concentration of H+ ions. The net effect will depend on the relative magnitudes of the ionization constant (Ka) and the hydrolysis constant (Kw).

7. In this case, the concentration of nitrous acid (0.085 M) is much greater than the concentration of nitrite ions (0.10 M), indicating that the ionization of nitrous acid is dominant. Therefore, the concentration of H+ ions can be approximated as x M.

8. To calculate x, we can use the expression for the acid dissociation constant (Ka) of nitrous acid: Ka = [H+][NO2-] / [HNO2]

Substituting the known values, we get:

4.5 x 10-4 = x * x / (0.085 - x)

9. Solving this equation will yield the value of x, which represents the concentration of H+ ions. From there, we can calculate the pH using the formula pH = -log[H+].

10. In summary, the pH of the solution can be calculated by considering the ionization of nitrous acid (HNO2) and the hydrolysis of nitrite ions (NO2-). The equilibrium between these reactions will determine the concentration of H+ ions, which in turn determines the pH value. The concentration of H+ ions can be approximated by assuming that the dominant reaction is the ionization of nitrous acid due to its higher concentration compared to nitrite ions. By solving the relevant equations, the concentration of H+ ions can be determined, and the pH of the solution can be calculated using the formula pH = -log[H+].

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Answer:

4.9 m^3

Explanation:

volume= 1.0 x 3.25 x 1.50= 4.875 -> 4.9m^3

The mass of the potassium nitrate solution is obtained as 32.3 g

Stoichiometry involves using the balanced chemical equation to establish the mole-to-mole ratio between the reactants and products. This ratio allows for the conversion of quantities between different substances involved in the reaction, using the concept of the mole, Avogadro's number, and molar masses of the substances.

We know that the mole ratio of the reaction can be sen as 1:1

2 moles of KI gives 2 moles of KNO3

0.32 moles of KI gives 0.32 * 2/2

= 2 moles of KNO3

Mass of KNO3 = 0.32 moles * 101 g/om

= 32.3 g

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The pressure change of a system can be determined from the change in volume using Boyle's law. The new pressure of the system if the volume is increased by a factor of 2.3 is 224.8 kPa.

According Boyle's law the volume of a system is inversely proportional to the pressure of the system thus PV = constant . Thus as pressure increases volume will decrease.

If p1 and v1 be the initial pressure and initial volume respectively and p2,v2 be the final quantities, then the we have the relation,

p1v1 = p2v2.

Here the initial pressure is 517.1 kPa and volume increases by a factor of 2.3 therefore, v2 = 2.3 V1. Now, the final pressure p2 is calculated as follows:

517.1 kPa × v1 =  p2 × 2.3 v1

 P2 = (517.1 kPa × v1 l)/2.3 v1 l

      = 517.1 kPa / 2.3

      = 224.8 kPa

Therefore, the new pressure of the system if the volume is increased by a factor of 2.3 is 224.8 kPa.

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Answer:

See Explanation

Explanation:

When a salt is dissolved in water, the solution could be acidic, basic or neutral depending on the nature of acid and base from which the salt was formed.

When a salt is formed from a strong acid and a weak base, the salt solution is acidic.

For instance, NH4Cl is a salt formed from NH3 which is a weak base and HCl which is a strong acid. The salt hydrolyses as follows;

NH4^+(aq) + H2O(l)  ------> H3O^+(aq) + NH3(aq)

Hence an acidic solution is formed.

Answer: By the very laws of the universe, matter cannot be created or destroyed, the Big Bang cannot have happened by its own power. There was a creator involved.

E= -5.23 × 10^-19 J/ion pair for Cs+ Br- ion pair.

E= -1.58 × 10^-18 J/ion pair for Mn2+ O2- ion pair.

therefore, lattice energy of second compound is higher than the first one.

Lattice energy is the bond energy of the compound which is now seperated.

Formula: E = (kq1q2)/r

now inserting the values for Cs+ and Br- into the equation,

where q1 = +1, q2 = −1, and r = 441 pm

Energy associated with the formation of a single pair of Cs+Br-

E= 2.31×10^-28 (+1)(-1)/441 × 10^-12

E= -0.00523 × 10^-16

E= -5.23 × 10^-19 J/ion pair

now inserting the values for Mn+2 and O2- into the equation,

where q1 = +2, q2 = −2, and r = 292 pm

Energy associated with the formation of a single pair of Mn+2O-2

E= 2.31×10^-28 (+2)(-2)/292× 10^-12

E= -0.0158 × 10^-16

E= -1.58 × 10^-18 J/ion pair

Therefore comparing both the ion pairs , the lattice energy of Mn+2 O2- pair is higher than the Cs+ Br- ion pair.

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The dominant transport mechanism in the lake is diffusion. The water treatment plant has a limited time before it needs to start treating for manganese, and the minimum height above the lake bottom for the water intake to provide one year for designing and installing a manganese treatment system needs to be determined.

Dominant transport mechanism: Diffusion is the main transport mechanism in the lake. This means that manganese is gradually diffusing from the solid deposits at the lake bottom into the water column.

 t = (L^2) / (4D)

where t is the time in seconds, L is the distance from the bottom (1 ft or 30.48 cm), and D is the diffusion coefficient of manganese (6.88×10^(-6) cm^2/s).

Calculation Plugging in the values into the equation, we can calculate the time it takes for manganese to reach the water intake level.

  t = (30.48^2) / (4 × 6.88×10^(-6)) = 126,707 seconds

  Converting seconds to days: 126,707 seconds ÷ (24 hours/day × 3600 seconds/hour) ≈ 1.47 days

  Therefore, the water treatment plant has approximately 1.47 days before it needs to start treating for manganese.

Minimum intake height: To provide one year for designing and installing a manganese treatment system, the intake should be raised to a height where the time it takes for manganese to reach that level is one year.

  t = (L^2) / (4D)

  Rearranging the equation to solve for L:

  L = √(4Dt)

  Plugging in the values: L = √(4 × 6.88×10^(-6) cm^2/s × (1 year × 365 days/year × 24 hours/day × 3600 seconds/hour))

  L ≈ 49.65 cm or 0.163 ft

The minimum height above the lake bottom that the intake should be raised to is approximately 0.163 ft.

The dominant transport mechanism in the lake is diffusion, where manganese is slowly diffusing from the solid deposits into the water column. The water treatment plant has approximately 1.47 days before it needs to start treating for manganese to maintain concentrations below the detection limit. To provide one year for designing and installing a treatment system, the intake should be raised to a minimum height of approximately 0.163 ft above the lake bottom.

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Answer: try 42.8

Explanation: you might have to round to 42.8 because of the significant  figures

The amount of medicine that should be given to a 182-pound person is 718 mg.

To calculate the dosage of medicine we have to first convert the weight of a person from pound to kg

We know that,

1 pound = 0.454 kg

Thus, the weight of a person weighing 182 pounds is 182 x 0.454 = 82.628 kg.

The dosage prescribed is 8.70 mg of medicine per kg of body weight.

Thus, the dosage for 82.62 kg comes out to be 82.62 x 8.70 = 718.78 mg.

Thus, the amount of medicine that should be given to a 182-pound person is 718 mg.

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Answer: A The Triangle Fire was a tragedy that could have been prevented.

Explanation:

The Triangle Fire was a tragedy that happened in the factory of Shirtwaist Company in New York City where there was.a.fore outbreak and about 145 employees of the company were killed.

The deaths could have been prevented because the company neglected safety measures such as having a good and reliable pump system, having readily available fire extinguishers. Also, what resulted in the lethal nature of the incident was because the doors within the building of the factory were locked.

The tragedy generated lots of attention and series of laws were been out in place in order to ensure that workers are safe at their workplace.

Carbonation is a crucial process in rock breakdown and formation of karst topography, involving the formation of calcium bicarbonate through precipitation of carbon dioxide and dissolved substances. This process affects rocks' physical properties and regulates atmospheric carbon dioxide concentration.

Calcium bicarbonate produced in the chemical weathering process of carbonation causes the rock to become weak and break down. This occurs when rainwater reacts with carbon dioxide and turns into a weak carbonic acid solution that can dissolve rocks. As a result, carbonation is an essential process in the breakdown of rocks and formation of karst topography.The chemical formula of calcium bicarbonate is Ca(HCO3)2. It is formed when rainwater, which contains carbon dioxide, reacts with rocks that contain calcium carbonate (CaCO3) like limestone and marble. The reaction is as follows:

CaCO3 + H2CO3 → Ca(HCO3)2

The carbonic acid solution reacts with the rock and breaks it down into calcium bicarbonate and other dissolved substances. Calcium bicarbonate is carried away by groundwater and eventually deposits to form stalactites, stalagmites, and other types of cave formations.

This chemical weathering process of carbonation not only affects the physical properties of rocks but also plays a significant role in the carbon cycle of the Earth. Carbonation helps to regulate the concentration of carbon dioxide in the atmosphere by removing it and storing it underground in the form of calcium carbonate deposits.

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Answer:

7/9

Explanation:

4+3=7

leave the denominators be

One mole or 12 g of carbon gives one mole or 16 g of methane gas. Then, 2750 g must give 3666 g. But the actual yield is 1740 g. Then the percent yield is 47.4%.

The percent yield of a reaction is the ratio of the actual yield to the theoretical yield multiplied by 100. It expresses how much of the reactants are effectively consumed to give the product.

The formation of methane gas is written as :

C + 2H₂ ⇒ CH₄

As per the reaction, one mole or 12 g of carbon gives one mole or 16 g of methane gas.

Then 2750 g of carbon will give,

(16 × 2750)/12 = 3666 g.

actual yield  = 1740 g.

Then,

percent yield = 1740 g/3666 g × 100 = 47.4%.

Therefore, the percent yield of the reaction is 47.4%.

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Answer:

The copper oxide can then react with the hydrogen gas to form the copper metal and water. When the funnel is removed from the hydrogen stream, the copper was still be warm enough to be oxidized by the air again.

Explanation:

Answer:

The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs. 

Explanation:

The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.