The concentration of s2o8 2- remaining at 1600 s is ________ m.

Answer:

Explanation:

The initial chemical energy is 50 J. The arrow for heat is the widest output arrow. The arrow for chemical energy is the shortest output arrow.

polar attractions are ... polar attractions are  (a), (b), and (c) are correct.

Between atoms with partial charges, polar attractions take place that are weaker than covalent bonds. Nevertheless, they are significant because so many of them take place in live cells.

Between atoms with partial charges, polar attractions take place that are weaker than covalent bonds. Nevertheless, they are significant because so many of them take place in live cells. can happen inside a water molecule and can develop between H and N.

We refer to something as polar when it has two distinct ends. When a molecule has both positive and negative ends, we refer to it as being polar. We refer to someone as non-polar if they don't. Polar objects can pull or pull away from one another (opposite charges attract, alike charges repel).

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Answer:

59.46 g

Explanation:

To answer this question, the molecular weight of ammonium sulfate must be computed.  To accomplish this, the weights of the individual elements must be noted.
N=14.01\(\frac{g}{mol}\)

H=1.01\(\frac{g}{mol}\)

S=32.07\(\frac{g}{mol}\)

O=16.00\(\frac{g}{mol}\)

To compute the molecular weight:

\(2[14.01\frac{g}{mol}+4(1.01\frac{g}{mol})]+32.07\frac{g}{mol}+4(16.00\frac{g}{mol})=132.14\frac{g}{mol}\)

To calculate the mass:

\(0.45 mol(\frac{132.14g}{1mol})=59.463g\)

To determine the molecules of butane we can either use multiple steps or use a combined equation based on the following formulas:

Molecules of butane = Moles × Avogadro's Number

Moles of Butane = Mass ÷ Molar Mass

Mass of Butane = volume × Density

∴ Molecules of butane

   = [(volume × Density) ÷ Molar Mass]  × Avogadro's Number

   = ([(25.0 ml × 0.6011 g/ml) ÷ 58.12 g/mol] × (6.022 × 10²³ molecules/mol))

   = 1.557 × 10²³ molecules

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 solubility of 20.0 g salt dissolved in 25.0 g of water at a certain temperature, in which 80% of the salt dissolves to give a saturated solution is 64%.

20.0g of salt was dissolved in 25.0g of water at a certain temperature and 80% of the salt dissolves to give a saturated solution. To determine the solubility of the salt in 100g of water, the following formula is used:

Solubility = (mass of solute/mass of solvent) x 100

Since 80% of the salt dissolves to give a saturated solution, let's assume that the remaining 20% is undissolved. Therefore, the mass of the solute that dissolves is:

Mass of solute = 80% x 20.0g = 16.0g

Mass of solvent = 25.0g

Using the formula above:

Solubility = (16.0g/25.0g) x 100 = 64%

Therefore, the solubility of the salt in 100g of water is 64%.

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Answer:

Ammonium lauryl sulfate, like any other surfactant, makes a good base for cleansers because of the way it disrupts the hydrogen bonding in water. Hydrogen bonding is the primary contributor to the high surface tension of water. In hydrogen bonding with the water surrounding them.

Answer:

It is illegal

Explanation:

Fracking involves drilling deep into the earth crust in which a water mixture with high pressure is directed at the rock with the purpose of releasing the gas inside. This process is common in the exploration of natural gas and other hydrocarbons.

It is however illegal because the water are mostly contaminated due to the hydrocarbons present and harmful to life. It is advisable and the best to remove the water and recycle them in treatment plants

The composition of each compound as the mass percent of its elements is as follows:

Concentration is expressed as mass percent. Additionally, the ingredients in a particular mixture are described. Solution composition can be understood in terms of mass percent. It indicates the mass of solute present in a solution of a given mass. The amount of solute is expressed in mass or moles.

Mass Percent = (Component Mass ÷ Total Mass) x 100% or

(mass of solute ÷ mass of solution) x 100%

a. Sucrose (C₁₂H₂₂O₁₁) with molecular mass of 342.296 u composed of:

Carbon: (12 x 12.01) / 342.296 = 42.18%

Hydrogen: (22 x 1.01) / 342.296 = 6.44%

Oxygen: (11 x 16) / 342.296 = 51.38%

b. Aluminum sulfate (Al₂(SO₄)₃) with molecular mass of 342.14 u is composed of:

Aluminum: (2 x 26.98) / 342.14 = 3.99%

Sulfur: (3 x 32.06) / 342.14 = 4.57%

Oxygen: (18 x 16) / 342.14 = 87.44%

c. Magnetite (Fe₃O₄) with molecular mass of 231.534 u is composed of:

Iron: (3 x 55.85) / 231.534 = 71.83%

Oxygen: (4 x 16) / 231.534 = 28.17%

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The number of moles in 15.5g of silicon dioxide is 0.258moles.

The number of moles in a substance can be calculated by dividing the mass of the substance by its molar mass as follows:

moles = mass ÷ molar mass

Moles is the amount of substance of a system which contains exactly 6.02214076 × 10²³ elementary entities.

Molar mass of silicon dioxide is 60.08 g/mol

moles = 15.5g ÷ 60.08g/mol

moles = 0.258moles

Therefore, 0.258moles is the amount of moles in 15.5g of silicon dioxide.

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The mass of carbon dioxide is 16.9 kg and the moles of acetylene is 192.01 mol

The chemical reaction is shown below.

2 C2H2 +502 - 2 H20 + 4CO2

The molar mass of C2H2 is 26.04 g/mol

The number of moles of acetylene can be calculated as shown below.

5.00 kg / 26.04 g/mol

= 5000 kg / 26.04 g/mol

= 192.01 mol

According to the balanced chemical equation, 2 moles of C2H2 produce 4 moles of CO2. So, we can find the number of moles of CO2 produced from the combustion of 192.01 mol of C2H2.

192.01 mol C2H2 x (4 mol CO2 / 2 mol C2H2) = 384.02 mol CO2

The molar mass of CO2 is  44.01 g/mol.

The mass of CO2 can be calculated as shown below.

384.02 mol CO2 x 44.01 g/mol = 16,900.72 g

= 16,900.72 g ×0.001

= 16.9 kg

Therefore, the mass of carbon dioxide produced from the combustion of 5.00 kg of acetylene is approximately 16.9 kg.

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The volume of gas  is 32.84 L.

given that :

Volume V1 = 90 L

Temperature T1 = 39 °C

pressure P1 = 740 mmHg

Volume V2 = ?

Temperature T2  = 15 °C

pressure P2 = 780 mmHg

according to the ideal gas equation we get :

P1 V1 / T1 = P2 V2 / T2

V2 = (P1 V1 T2) / P2 T1

V2 = ( 740 × 90 × 15 ) 780 × 39

V2 = 32.84 L

Thus, A ga balloon ha a volume of 90. 0 liter when the temperature i 39 °C and the pressure i 740. 0 mmHg. it volume be at 15. 0 °C and 780. 0 mmHg is 32.84 L

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Taking into account the Newton's second law, the correct answer is option A. F = 9.68 N right

In first place, acceleration in a body occurs when a force acts on a body.

Newton's second law states that a force will change the speed of an object because the speed and/or direction will change. These changes in velocity are called acceleration.

So, Newton's second law defines the relationship between force and acceleration mathematically. This law says that the acceleration of an object is directly proportional to the sum of all the forces acting on it and inversely proportional to the mass of the object

Mathematically, Newton's second law is expressed as:

F= m×a

where:

In this case, you know:

Replacing in Newton's second law:

F= 2.2 kg× 4.4 m/s²

Solving:

F= 9.68 N

Finally, As the bowl of fruit accelerates to the right, the correct answer is option A. F = 9.68 N right

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A home heating system typically includes two other feedback control systems: thermostat control and water heater control.

Thermostat control is a widely used feedback control system in residences to regulate indoor temperature. It consists of a sensor, actuator, and controller. The sensor, usually a thermometer, measures the ambient temperature in the living space. The controller compares the measured temperature with the desired setpoint and determines if heating or cooling is required. The actuator, typically a furnace or air conditioning unit, adjusts the heating or cooling output based on the controller's instructions. Once the ambient temperature reaches the setpoint, the controller signals the actuator to stop heating or cooling, maintaining a comfortable temperature in the residence.

Another common feedback control system found in residences is the water heater control. This system ensures the water temperature is maintained at a desired level. The sensor, often a thermostat, measures the temperature of the water in the heater. The controller compares the measured temperature with the desired setpoint. If the water temperature falls below the setpoint, the controller activates the actuator, such as a heating element, to raise the water temperature. Once the desired temperature is reached, the controller instructs the actuator to stop heating, ensuring a constant supply of hot water for various household needs.

Overall, both thermostat control and water heater control systems in residences rely on sensors to measure relevant parameters, controllers to compare the measured values with desired setpoints, and actuators to adjust the heating or cooling output or water temperature accordingly. These feedback control systems play crucial roles in maintaining comfort and convenience in households.

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Answer:

a

Explanation:

a

(a) The overall balanced equation for the iron-smelting process, including the state of each molecule is: Fe2O3(s) + 3CO(g) → 2FeO(s) + 3CO2(g), FeO(s) + CO(g) → Fe(s) + CO2(g). (b) Approximately 2,140,283.17 grams of carbon monoxide are required to form 1.422 metric tons of iron from ferric oxide.

We can use stoichiometry to determine the amount of carbon monoxide needed to form 1.422 metric tons of iron from ferric oxide. The molar mass of Fe is 55.845 g/mol, so 1.422 metric tons (or 1,422,000 g) of Fe is equivalent to: \(1,422,000 g Fe * (1 mol Fe/55.845 g Fe) = 25,472.33 mol Fe\)

\(25,472.33 mol Fe2O3 * (3 mol CO/1 mol Fe2O3) = 76,417 mol CO\)

\(76,417 mol CO * (28.01 g CO/1 mol CO) = 2,140,283.17 g CO\)

Therefore, approximately 2,140,283.17 grams of carbon monoxide are required to form 1.422 metric tons of iron from ferric oxide.

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The transition with the longest wavelength of emitted light is from option A, n=4 to n=1. This corresponds to the electron moving from a higher energy level (n=4) to a lower energy level (n=1), resulting in the emission of light with a longer wavelength.

According to the Bohr model of the atom, electrons occupy specific energy levels or orbitals around the nucleus. The energy levels are labeled by the principal quantum number (n), with higher values of n corresponding to higher energy levels.

When an electron transitions from a higher energy level to a lower energy level, it releases energy in the form of light. The energy of the emitted light is directly related to the difference in energy between the initial and final energy levels of the electron.

As the electron transitions from a higher energy level (n=4) to a lower energy level (n=1), the energy difference is greater compared to the other options. Since the energy of a photon is inversely proportional to its wavelength, the transition from n=4 to n=1 will result in the emission of light with the longest wavelength among the given options.

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Answer:

1. Mg (s) + 2Na+(aq) → 2Na(s) + Mg²⁺(aq)

2. 2K(s) + Cd²⁺(aq) → 2K⁺(aq) + Cd(s)

Explanation:

The net ionic equation of a reaction express only the chemical species that are involved in the reaction:

1. Mg (s) + Na2CrO4 (aq) → 2Na + MgCrO4(aq)

The ionic equation:

Mg (s) + 2Na+(aq) + CrO4²⁻ (aq) → 2Na + Mg²⁺ + CrO4²⁻(aq)

Subtracting the ions that don't change:

2. 2K(s) + Cd(NO3)2(aq) → 2KNO3(aq) + Cd(s)

The ionic equation:

2K(s) + Cd²⁺(aq) + 2NO3⁻(aq) → 2K⁺(aq) + 2NO3⁻(aq) + Cd(s)

Subtracting the ions that don't change:

Lithium, as a stronger ion-dipole interaction results from a smaller atomic radius.

The number of miles from a nuclear charge to its outermost electron orbital is typically defined as the atomic radius. Only by determining the separation seen between nuclei of two contacting molecules and halving a certain distance can one determine the dimension of an atom.

The type of chemical bond that the atoms are engaged in determines the value of their atomic radii (metallic, ionic, or covalent bond). A portion of the observable distance separating atoms is attributed to one type of atom and the remainder to another type when the neighboring atoms are not identical, as in sodium chloride.

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The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration

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We can separate the mixture of copper and salt by putting both mixtures in water. Salt will dissolve and copper will not. We can separate them easily.

Salt can dissolve in water because it is a soluble substance. Salt is made up of the negative ion of an acid and the positive ion of the base. When an acid and base dissolve neutralization reaction occurs.

Copper doesn't dissolve in water because copper is a metal. Not even in salty water. Copper has great metal conductivity. The melting and boiling point of copper is very high, that is, 1084.32 degrees Celsius and 2562 degrees Celsius.

Copper metal doesn't dissolve in water however exposure to such metals to air adds a layer of oxide to the metal. The oxide layer does dissolve in water to a slight extent.

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Answer: The anwser is A a photon was realeased please mark brainliest

Explanation:

Answer: A

Explanation: Potassium is a metal.

Answer: 51 g

Explanation:

First, we need to calculate the mass of jellybeans alone.

Mass of Jellybeans + Jar = 1642 grams

Mass of Jar ONLY = 495 grams

Mass of Jellybeans = Mass of Jellybeans + Jar - Mass of Jar ONLY

Mass of Jellybeans = 1642 g - 495 g

Mass of Jellybeans = 1147 g

Next, we need to find the mass of one jellybean.

Mass of 20 Jellybeans = 7.94 grams

Mass of 1 Jellybean = Mass of 20 Jellybeans ÷ 20

Mass of 1 Jellybean = 0.397 g

Finally, we can estimate the number of jellybeans in the jar by dividing the total mass of jellybeans by the mass of one jellybean.

Number of Jellybeans = Mass of Jellybeans ÷ Mass of 1 Jellybean

Number of Jellybeans = 1147 g ÷ 0.397 g

Number of Jellybeans ≈ 2891

Therefore, there are approximately 2891 jellybeans in the jar.

Answer:

mass of jellybeans + jar = 1642 g

mass of jar = 495 g

mass of jellybeans alone = 1642 - 495 = 1147g

mass of 20 jellybean= 7.94 g

mass of 1 jellybean= 7.94 ÷ 20 = 0.397 g

total number of jelly beans = 1147 ÷ 0.397 = 2889

There are approximately 2889 jellybeans in jar

The benzoic acid Collect the top layer dry with Na2SO4 and evaporate the solvent.

Benzoic acid is sparingly soluble in water and forms a precipitate. The benzoic acid can then be separated by suction filtration through a Buchner funnel. Washing with sodium bicarbonate converts the benzoic acid to the more water-soluble form of sodium benzoate, which is extracted into the aqueous layer. Additionally, sodium bicarbonate neutralizes the catalytic acid in this reaction.

Benzoic acid containing the naphthalene impurity can be purified by crystallization in water. The reaction between benzoic acid and NaOH is an acid-base neutralization reaction. An acid reacts with a base to form salt and water. In aqueous solutions, NaOH increases the solubility of benzoic acid. Benzoic acid cannot move from one layer to another because ethanol is immiscible with water.

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The correct answer is that the acid dissociation constant (Ka) for lactic acid is \(1.59 × 10^(-3)\) (to two significant figures).

Lactic acid is a weak acid that dissociates in water to produce hydrogen ions (H+) and lactate ions \((CH3CH(OH)COO-)\). The dissociation of lactic acid can be represented by the following equation: \(CH3CH(OH)COOH ⇌ H+ + CH3CH(OH)COO-\) . The equilibrium constant for this reaction is called the acid dissociation constant (Ka), which is defined as the ratio of the concentrations of the products (H+ and \(CH3CH(OH)COO-)\) to the concentration of the reactant (lactic acid).

\(Ka = [H+][CH3CH(OH)COO-]/[CH3CH(OH)COOH]\). The pH of a solution is defined as the negative logarithm (base 10) of the hydrogen ion concentration \((pH = -log[H+])\). Therefore, the concentration of hydrogen ions in a \(0.10 mM\) solution of lactic acid with a pH of 2.44 can be calculated as follows: \([H+] = 10^(-pH) = 10^(-2.44) = 3.98 × 10^(-3) M\)

Using the equilibrium equation and the hydrogen ion concentration, the acid dissociation constant (Ka) for lactic acid can be calculated as:

\(Ka = [H+][CH3CH(OH)COO-]/[CH3CH(OH)COOH] = (3.98 × 10^(-3))^2 / (0.10 × 10^(-3)) = 1.59 × 10^(-3)\)Therefore, the acid dissociation constant (Ka) for lactic acid is\(1.59 × 10^(-3)\) (to two significant figures).

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The heat emitted when 450 g of Bromine (Br2) reacts according to the given equation is -407.1 kJ. The negative sign indicates that the reaction is exothermic (heat is released).

To calculate the heat emitted in the given reaction, we need to know the number of moles of Bromine (Br2) that react. For this, we can use the given mass of 450 g and the molar mass of Bromine (Br2):

Molar mass of Br2 = 2 x Atomic mass of Br = 2 x 80 uma = 160 g/mol

Number of moles of Br2 = Mass of Br2 / Molar mass of Br2

= 450 g / 160 g/mol

= 2.8125 mol (rounded to 4 decimal places)

Now, we can use the given value of ΔH° and the stoichiometry of the reaction to calculate the heat emitted:

ΔH = n x ΔH°

= 2.8125 mol x (-144.8 kJ/mol)

= -407.1 kJ

Therefore, the heat emitted when 450 g of Bromine (Br2) reacts according to the given equation is -407.1 kJ. The negative sign indicates that the reaction is exothermic (heat is released).

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Translated Question: Calculate the heat emitted when reacting 450 g of Bromo (Br2) according to the equation. (Peso atómicodel Br = 80 uma)H2 (g) + Br2 (g) → 2HBr(g) ∆H° = -144. 8 kJ/mo