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The most common source of copper (Cu) is the mineral chalcopyrite (CuFeS2). How many kilograms of chalcopyrite must be mined to obtain 400.
g of pure Cu
Express your answer to three significant figures and include the appropriate
units.

The frequency is used to measure the number of waves that pass through a fixed point in a certain amount of time. That is option B.

A wave is defined as a disturbance in a medium that travel from a point to another in an organised fashion.

There are different properties of a wave that include the following:

The frequency of a wave is defined as the property of a wave that shows the the number of crests (high points) of waves that pass the fixed point in a given number of time.

Therefore, frequency of a wave measures the number of waves that pass through a fixed point in a certain amount of time.

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Wave frequency measures the waves that pass through a fixed point in a certain amount of time (option B)

Frequency of a wave is defined as the number of complete oscillations, vibrations or waves made in 1 second. This is written formula:

Frequency (f) = Number of oscillation (n) / time (s)

f = n / t

The SI unit of wave frequency is Hertz.

Wave frequency is related to speed of wave and wavelength according to the following formula:

Velocity (v) = wavelength (λ) × frequency (f)

v = λf

Wave frequency is also related to the period of a wave according to the following formula:

Frequency (f) = 1 / Period (T)

f = 1 / T

With the above information about wave frequency, we can conclude that the correct answer to the question is option B

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Answer:

The given reaction is:

2A(g) ⇌ B(g)

The equilibrium constant (Kp) is given as 7.17 × 10^−5 at 500 K.

We are given the initial pressure of A(g) as 3.10 atm.

Let's assume that the pressure of B(g) at equilibrium is x atm.

Using the equilibrium constant expression, we can write:

Kp = (P_B)^1 / (P_A)^2

Substituting the values, we get:

7.17 × 10^−5 = (x)^1 / (3.10)^2

Solving for x, we get:

x = 7.17 × 10^−5 × (3.10)^2

x = 6.81 × 10^−4 atm

Therefore, the pressure of B(g) at equilibrium is 6.81 × 10^−4 atm when a sample of A(g) at 3.10 atm is heated to 500 K.

Explanation:

The given chemical reaction is in the form:

2A(g) ⇌ B(g)

This means that two molecules of A(g) can combine to form one molecule of B(g), and one molecule of B(g) can break down into two molecules of A(g). The double arrow indicates that the reaction can proceed in both directions, and the reaction is said to be in a state of equilibrium when the forward and reverse reactions occur at the same rate.

The equilibrium constant (Kp) is a measure of the relative concentrations of the reactants and products at equilibrium, and is given as 7.17 × 10^-5 at 500 K.

We are given the initial pressure of A(g) as 3.10 atm. Since we are asked to find the pressure of B(g) at equilibrium, we assume that the pressure of B(g) is x atm.

Using the equilibrium constant expression, we can write:

Kp = (P_B)^1 / (P_A)^2

where P_B is the pressure of B(g) at equilibrium, and P_A is the pressure of A(g) at equilibrium. Since we know the value of Kp and the initial pressure of A(g), we can solve for P_B.

Substituting the given values, we get:

7.17 × 10^-5 = (x)^1 / (3.10)^2

Simplifying this expression, we get:

x = 7.17 × 10^-5 × (3.10)^2

x = 6.81 × 10^-4 atm

Therefore, the pressure of B(g) at equilibrium is 6.81 × 10^-4 atm when a sample of A(g) at 3.10 atm is heated to 500 K.

Answer:

the molarity of the solution would be 10.0 M if 80.0 grams of NaOH were added to 200 milliliters of water.

Explanation:

To calculate the molarity of a solution, we can use the formula:

Molarity = moles of solute / volume of solution in liters

First, we need to calculate the moles of sodium hydroxide (NaOH) in the given mass:

moles NaOH = mass of NaOH / molar mass of NaOH

The molar mass of NaOH is 40.00 g/mol (the atomic mass of Na is 22.99 g/mol, the atomic mass of O is 15.99 g/mol, and the atomic mass of H is 1.01 g/mol).

For 52 g NaOH:

moles NaOH = 52 g / 40.00 g/mol = 1.30 mol

Now, we can calculate the molarity of the solution:

Molarity = moles NaOH / volume of solution in liters

We don't know the volume of the solution for the first case, so we cannot calculate the molarity.

For the second case, we have 80.0 g NaOH and 200 mL of water. We need to convert the volume to liters:

200 mL = 0.200 L

Now, we can calculate the moles of NaOH:

moles NaOH = 80.0 g / 40.00 g/mol = 2.00 mol

Finally, we can calculate the molarity of the solution:

Molarity = moles NaOH / volume of solution in liters

Molarity = 2.00 mol / 0.200 L

Molarity = 10.0 M

Therefore, the molarity of the solution would be 10.0 M if 80.0 grams of NaOH were added to 200 milliliters of water.

Answer:

sodium(Na) +Chlorine(Cl)=Sodium chloride(NaCl)

Hydrogen(H)+ Fluorine (F)=Hydrogenflouride(HF)

Hydrogen (H) + Oxygen (O) =water(H2O)

Magnesium (Mg) + Bromine (Br) =Magnesium bromide(MBr)

Aluminum (Al) + Chlorine (CI) =Aluminium chloride(AlCl3)

Hydrogen (H) + Nitrogen (N) = ❌

Boron (B) + Sulfur (S) = ❌

Magnesium (Mg) + Phosphorous (P) = ❌

Carbon (C) + Hydrogen (H) =Hydrocarbons(CH3,CH4,C2H5,C2H6 and so on)

Silicon (Si) + Oxygen (O) =sillicate oxide(SiO3)

Explanation:

The reactions without answers cannot occurs as the reating element cant form a bond

The 30m this affect the speed of light as it passes around the object.

The rate of a directionally changing object's location. The SI unit of speed is created by combining the fundamental units of length and time. Meters per second (m/s) is the unit of speed in the metric system.

Space is occupied by every three-dimensional object. Its volume serves as a gauge for this area. The area contained by an object's limits in three-dimensional space is referred to as its volume. Another name for it is an object's capacity.

Therefore, 30m this affect the speed of light as it passes around the object.

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It is true that two moles of oxygen will take up twice as much space as two moles of hydrogen at same temperature and pressure.

The mean kinetic energy of every one of the atoms and molecules in a substance is what chemists refer to as the substance's temperature. Different parts of a material have different amounts of kinetic energy. The kinetic energy of the particles at any instant can be represented as a distribution.

The normal kinetic energy of the water molecules in the hotter water vessel is greater than those in the cooler glass, for example, if two glasses of water are measured to have different temperatures.

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If the reaction continues to completion and all of the O2 is burned, we can get 127.32 g of KClO3 from 50.0 g of O2.

The balanced chemical equation for the reaction is:

2 KClO3(s) → 2 KCl(s) + 3 O2(g)

50.0 g O2 × (1 mol O2 / 32.00 g O2) = 1.5625 mol O2

1.5625 mol O2 × (2 mol KClO3 / 3 mol O2) = 1.0417 mol KClO3

1.0417 mol KClO3 × (122.55 g KClO3 / 1 mol KClO3) = 127.32 g KClO3

The mass has two significant figures in the question, thus the amount of O2 released would be 4.0 g. (two significant figures). 3*32 g of O2 result from 122.55 g of KClO3. 0.783353733 g of O2 would be produced from 1 g of KClO3. Thus, 5 g of KClO3 would produce 4.0 g of O2 or 5*0.783353733 g of O2.

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1. When 36.0 g of H₂O is mixed with 67.0g of Fe, the moles of Fe₃O₄ produced by each reactant will be;

2. Fe is the limiting reactant.

3. H₂O is the excess reactant

4. The theoretical Yield amount in mol Fe₃O₄ is 0.4 moles

5. The actual yield is obtained from the lab

6. The mass of excess reactant is 7.2 g

Equation of the reaction: 3 Fe + 4 H₂O ---> Fe₃O₄ + 2 H₂

Molar mass of Fe = 56 g

Molar mass of H₂O = 18 g

Molar mass of Fe₃O₄ = 232 g /mol

Molar mass of H₂ = 2.0 g

1. When 36.0 g of H₂O is mixed with 67.0g of Fe, the moles of Fe₃O₄ produced by each reactant will be;

H₂O:

moles of Fe₃O₄ produced= 36/18 * 1/4

moles of Fe₃O₄ produced = 0.5 moles

Fe:

moles of Fe₃O₄ produced = 67/56 * 1/3

moles of Fe₃O₄ produced = 0.40 moles

Fe is the limiting reagent while H₂O is the excess reagent.

Moles of H₂O required = 36/18 - 0.4 * 4

Moles of H₂O required = 0.4 moles

The mass of excess reagent = 0.4 * 18

The mass of excess reagent = 7.2 g

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A aqueous solution is one in which water serves as the solvent.Chemical equations typically illustrate it by adding (aq) to the appropriate chemical formula.For instance, Na +(aq) + Cl might be used to indicate a solution of salt, or table salt (NaCl), in water (aq).

Cola, saltwater, rain, acid, base, and salt solutions are a few examples of watery solutions.Any liquid that lacks water is an example of a solution that is not an aqueous solution.

A nonaqueous solution uses a substance apart from water as the solvent, whereas an aqueous solution uses water as the solvent.Ethyl acetate, a common ingredient in nail polish removers, & turpentine, a cleaning agent for paintbrushes, are examples of nonaqueous solvents.

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The enthalpy of formation of solid copper metal and and hydrogen gas is zero. The enthalpy of formation of water is - 286 KJ. From this, the enthalpy of formation of solid CuO is - -156.3 KJ.

The heat energy absorbed or evolved by a reaction is called the reaction enthalpy. The enthalpy required for the formation of one mole of a compound from its constituent elements is called enthalpy of formation.

The reaction enthalpy for a reaction is:

∑ ΔH (products) - ∑ ΔH (reactants)

given ΔHrxn = -129.7 KJ.

ΔH (H₂O (l)) +ΔH (Cu((s))  - ∑ ΔH (CuO) + ΔH (H₂) = -129.7 KJ

From the standard data of  enthalpy of formation,

ΔH (H₂O (l)) = - 286 KJ

ΔH (Cu((s)) = 0

ΔH (H₂) = 0.

Then,

ΔH (H₂O (l))  - ΔH (CuO) = -129.7 KJ.

- 286 KJ - ΔH (CuO) = - 129.7 KJ.

ΔH (CuO) = - 286 KJ - (-129.7 KJ ) = -156.3 KJ.

Therefore, the enthalpy of formation of CuO (s) is - 156.3 KJ.

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Two layers must have been separated in some way if they are not attached.

The two networks are single layer perceptron networks, in other words. A line is produced by each perceptron. We may infer from the fact that only two lines are needed to represent the decision border that there will be two hidden neurons in the first hidden layer. We have one hidden layer and two hidden neurons up until this moment.

These are "hidden" since the training dataset's nodes' actual values aren't known. Indeed, all we know is the input and output. There is at least one hidden layer in every neural network. It is not a neural network if it is not.

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Answer:

3

Explanation:

Answer:

2 moles of H3PO4 reacts with 3 moles of FeBr2

Explanation:

Hope this helps :)

143.4kPa would be the new pressure be if the volume was increases to 4.5 L

What is an ideal gas ?

An ideal gas is a hypothetical gas that perfectly complies with the gas laws due to its small size and lack of interactions. A gas that obeys all gas laws at all pressures and temperatures is said to be perfect gas.

When the pressure is expressed in kPa, the ideal gas constant is determined to be 8.314J/Kmol. The pressure, volume, temperature, and number of moles of an ideal gas are all related by a singular equation known as the ideal gas law. The combined gas law connects a gas's volume, pressure, and temperature.

Considering constant n, R and T

P1V1 ⇒ P2V2

239*2.7 ⇒ P2 *4.5

P2 ⇒ 143.4kPa

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Answer:
You will need 6.4 joules

In terms of the quantity of a reactant that is reduced or the amount of such a product that is increased per unit time, the reaction's activation energy is 89.2 kJ/mol.

resistance in opposition to a power, influence, or movement is a reaction, a reactionary act, or an instance of a reactionary act. Particularly: a propensity for an old, typically antiquated political or social structure or policy; a reaction to a given treatment, circumstance, or stimulus. She received the news in shock.

Changes in color, temperature, gas generation, or precipitant formation are common during chemical reactions. Examples of commonplace processes include digestion, combustion, or cooking.

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In a sublevel for which l=0, there is 1 orbital, and the maximum number of electrons that can be accommodated is 2.

Orbital refers to the paths that atoms, molecules, and other particles take as they move around their nucleus due to the attraction of their electrons. As electrons move around their atom, they form an orbital which is the path that the electrons take in order to complete a full orbit. The shape and size of the orbital will depend on the distance between the electron and the nucleus, as well as the amount of energy being supplied to the electrons. Depending on the energy and distance, electrons can form different types of orbitals, such as s, p, d, and f orbitals.

In a principle energy level for which n=3, the maximum number of electrons that can be accommodated is 18.
Given the appropriate values of n and l for an orbital of 3p:n= 3 and l= 1.

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Answer: Your welcome!

Explanation:

(a) The amount of oxygen gas required to react with 7.98 liters of hydrogen gas at STP in the synthesis of water is 7.98 liters. This is because the balanced chemical equation for the synthesis of water is 2H2 + O2 → 2H2O. Since the moles of hydrogen gas are equal to the moles of oxygen gas, the volume of oxygen gas required would be equal to the volume of hydrogen gas.

(b) The mass of water produced by the reaction is equal to the mass of hydrogen gas (2 x 1.00794 g/mol) plus the mass of oxygen gas (16.00 g/mol) multiplied by the molar ratio of hydrogen gas to oxygen gas (2:1). This gives us a total mass of 18.01588 g.

Explanation:

Since the process occurs at constant pressure, the total heat flow is equal to the change in enthalpy, ΔH. Since the process occurs in three steps, we need to find the enthalpy change for each step and add them together to find the total heat flow.

Step 1: Isothermal expansion

Since the temperature is constant during this step, the enthalpy change is zero:

ΔH1 = 0

Step 2: Isobaric cooling

The enthalpy change for an ideal gas during an isobaric process is given by:

ΔH2 = -nCpΔT

where n is the number of moles of gas, Cp is the molar heat capacity at constant pressure, and ΔT is the change in temperature. Since the volume is constant during this step, the number of moles of gas is also constant. The molar heat capacity at constant pressure for an ideal gas is Cp = 5/2R, where R is the gas constant. The change in temperature is given by:

ΔT = Tfinal - Tinitial

where Tinitial and Tfinal are the initial and final temperatures, respectively. Since the gas is cooled back to its original temperature, we have:

ΔT = 0

Therefore, ΔH2 = 0.

Step 3: Isochoric compression

During an isochoric process, the enthalpy change is equal to the internal energy change:

ΔH3 = ΔU

The internal energy of an ideal gas depends only on its temperature, so the change in internal energy is given by:

ΔU = nCvΔT

where Cv is the molar heat capacity at constant volume. For an ideal gas, Cv = 3/2R. Since the temperature is constant during this step, the change in internal energy is zero:

ΔU = 0

Therefore, ΔH3 = 0.

The total enthalpy change is the sum of the enthalpy changes for each step:

ΔH = ΔH1 + ΔH2 + ΔH3

ΔH = 0 + 0 + 0 = 0

Since the enthalpy change is zero, the total heat flow is also zero:

Total heat flow = ΔH = 0 J.

The preferred arrangement of electrons in a molecular structure can be determined by calculating the electronic configuration of each atom in the molecule.

What is electronic configuration?

The electronic configuration of an atom is determined by the number of protons in the nucleus and the specific rules governing the filling of energy levels and orbitals. The electronic configuration is usually represented using a notation that indicates the number of electrons in each energy level or orbital.

what is delocalized electron ?

Delocalized electrons are electrons that are not restricted to a specific location or region in a molecule or material, but instead are spread out over multiple atoms or molecules. In other words, delocalized electrons are free to move throughout a larger region instead of being confined to a single atom or bond.

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The total pressure of the  mixture is 2.03 atm.

To solve this problem, we can use the ideal gas law, which relates the pressure, volume, number of moles, and temperature of a gas:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to calculate the number of moles of each gas present in the cylinder. For helium:

n(He) = PV / RT

n(He) = (1.71 atm) (2.00 L) / (0.0821 L atm/mol K) (300.15 K)

n(He) = 0.139 mol

For argon:

n(Ar) = mass / molar mass

n(Ar) = 4.32 g / 39.95 g/mol

n(Ar) = 0.108 mol

The total number of moles in the cylinder is the sum of the moles of helium and argon:

n(total) = n(He) + n(Ar)

n(total) = 0.139 mol + 0.108 mol

n(total) = 0.247 mol

Now, we can use the ideal gas law to calculate the total pressure of the mixtP(total) = n(total) RT / V

P(total) = (0.247 mol) (0.0821 L atm/mol K) (300.15 K) / (2.00 L)

P(total) = 2.03 atm

Therefore, the total pressure of the resulting gaseous mixture is 2.03 atm.

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Answer:

(a) GaF3, gallium(III) fluoride

(b) LiH, lithium hydride

(c) AlI3, aluminum(III) iodide

(d) K2S, potassium sulfide

When the mass of a extra HCl is taken into account, the overall weight of the goods is roughly 274 g. n its reaction with an organic base, hydrochloric acid transforms into a salt known as hydrochloride.

Muriatic acid, often known as hydrochloric acid, is a powerful, colorless mineral acid with various industrial applications. When it combines with an organic base, it produces a hydrochloride salt.

Proteins are broken down by hydrochloric acid (HCl), which the stomach produces. The body can digest protein well if you produce a lot of HCl. Otherwise, protein digestion is hampered.

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We are aware that the chemical formula for chloric acid is (ClO3) nitrous acid, HNO2HNO2, carbonic acid, perchloric acid, and acetic acid (HClO4). HCl is another name for hydrochloric acid.

The term hydroiodic acid, or hydriodic acid, refers to an aqueous solution of hydrogen iodide (HI). In an aqueous solution, it is a strong acid that totally ionizes. It lacks color. A HI of 48 to 57 percent is typical for concentrated solutions.

A strong acid is perchloric acid (HClO4). A strong acid, according to the theories, is one that entirely ionizes or dissolves easily in water. Because it entirely dissolves in water as well, perchloric acid (HClO4) is a potent acid.

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Answer:

The ideal gas law relates the pressure, volume, temperature, and number of moles of a gas. We can use this equation to find the number of moles of gas in the flask. Then, we can use the mass of the gas and the number of moles to find the molar mass of the gas. Finally, we can use the mass and volume of the gas to find the density of the gas.

To solve this equation, we first need to convert the temperature from Celsius to Kelvin. Then, we can use the ideal gas law equation to find the number of moles of gas in the flask. We can use the mass and the number of moles to find the molar mass of the gas. Finally, we can use the mass and volume of the gas to find the density of the gas.

Therefore, the density of the gas is 2.31 g/L, and the molar mass of the gas is 59.5 g/mol.

Explanation:

Compared to Li, Li2+ has a higher ionization level.

A smaller atom than Na is Li. As a result, Li has a stronger nucleus attraction for valence electrons than Na. Hence, Li's first ionisation energy is higher than that of a nucleus. Due to the size of the lithium ion, more solvent molecules can easily surround the cationic sphere.

Going from left to right increases the ionisation energy. Ne therefore has the highest ionisation energy of all the elements. Lithium has a higher second ionization energy than beryllium because its valence electrons do not have enough electrons to protect its outer electrons.

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The new volume of a gas when the pressure is increased to 7.0 atmospheres is 3.57 L.

The volume of a gas can be calculated by using the following formula:

P₁V₁ = P₂V₂

Where;

According to this question, 5.0 litres of a gas at an initial pressure of 5atm is given. The new volume can be calculated as follows:

5 × 5 = 7 × V

25 = 7V

V = 25/7

V = 3.57L

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KCl = Potassium chloride

NaCl = Sodium chloride

FeCl2 = Iron (II) chloride or ferrous chloride

MgO = Magnesium oxide

CuO = Copper (II) oxide or cupric oxide

LiCl = Lithium chloride

PbO = Lead (II) oxide or plumbous oxide

CuI = Copper (I) iodide or cuprous iodide

NaOCl = Sodium hypochlorite

SF4 = Sulfur tetrafluoride

Hope this helped !