The solubility of Ag,PO, in water at 25 °C is 4.3 x10-5 M. What is Ksp for Ag3PO? A) 2.1 x 10-12 B) 1.8 x 109 C) 9.2 × 10-17 D) 3.1 × 10-17

Answer:

1

Explanation:

Refer to the attachment for proof

The balanced equation has a proportionate number of atoms on both sides of the reaction. In the reaction between lead nitrite and zinc bromide, the coefficient of PbBr₂ is 1. Thus, option C is correct.

A balanced equation is the representation of the elements and the compounds of the reactants and the product side in the symbolic forms along with their balanced coefficients.

The coefficient of the element on the right and the left side of the reaction must be the same in order for the reaction to be balanced. The balanced reaction between zinc bromide and lead nitrite is shown as,

ZnBr₂ + Pb(NO₂)₂ → Zn(NO₂)₂ + PbBr₂

Here, the number of zinc, lead, and nitrogen dioxide is 1 on both the reactant and product side, whereas bromine is two on both sides.

Therefore, in option C. the coefficient in front of PbBr₂ is 1.

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As protons in the electron transport chain diffuse back inside the mitochondrial matrix, they turn ATP synthase, which creates ATP from ADP using oxidative phosphorylation.

The electron transport chain (ETC) is an essential part of cellular respiration, specifically in the production of ATP, the cell's primary source of energy. Located in the inner mitochondrial membrane, the ETC comprises several protein complexes that work together to transport electrons and pump protons across the membrane. This proton pumping process creates an electrochemical gradient, referred to as the proton motive force. As protons accumulate in the intermembrane space, they generate potential energy, which is harnessed when they diffuse back into the mitochondrial matrix through a protein complex called ATP synthase, this process of protons flowing through ATP synthase is known as chemiosmosis.

As ATP synthase rotates due to the movement of protons, it catalyzes the conversion of ADP (adenosine diphosphate) into ATP (adenosine triphosphate) by adding a phosphate group, a process called oxidative phosphorylation. This newly synthesized ATP is then transported out of the mitochondria and used by the cell for various energy-requiring processes. As protons in the electron transport chain diffuse back inside the mitochondrial matrix, they turn ATP synthase, which creates ATP from ADP using oxidative phosphorylation.

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Answer:

1,103.47 milliliters

Explanation:

The total percentage of alcohol from solution A and solution B is 29. In a solution that is a mixture of solution A and B, the percentage of alcohol that would be contributed by solution A would be:--

                   11/29 x 100% = 37.93%

--while the percentage of alcohol that would be contributed by solution B would be:

               18/29 x 100 = 62.07%

Hence, if a mixture of A and B has 320 milliliters of alcohol, the amount of alcohol contributed by B would be:

                     320 x 62.07/100 =  198.624 milliliters

Now, remember that solution B is 18% alcohol. This means that the 18% alcohol content of solution B is 198.624 milliliters. Thus, the total volume of solution B would be:

                 198.624 x 100/18 = 1,103.47 milliliters.

Therefore, the total milliliters of solution B Amanda used would be 1,103.47.

To solve this question we need to use the combined gas law:

sufix 1 reffears to the initial state and sufix 2 reffears to the final state. P is pressure, V volume and T temperature (in Kelvin). They are asking for the pressure at the final state (P2) and they give the initial conditions: P1= 1atm, V1=1L T1=25°C=298K and the final temperature T2=1000°C= 1273 K. They alse say that the Volume is fixed so V2=V1=1L. then we just have to substitute the values into the eqaution:

Then solve P2. P2 = 4.272 atm

Answer:

D Propane

Explanation:

Very weak intermolecular forces between alkane MOLECULES AND IT'S COLOURLESS GASES IN ROOM TEMPERATURE

An object is said to be accelerated if there is a change in its velocity. The change in the velocity of an object could be an increase or decrease in speed or a change in the direction of motion. The acceleration of the parachute is -8.88 m/s².

The rate of change of velocity with respect to time is defined as the acceleration. It is a vector quantity which has both magnitude and direction. It is the second derivative of position and first derivative of velocity.

Acceleration = Vf - Vi / t

45 - 85 / 4.5 = -8.88 m/s²

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solvation

Explanation:

Gaseous solutes already have their constituent particles separated, but the concept of being surrounded by solvent particles still applies.)

Answer:

The empty cup

Explanation:

Got it right on the test

The order of the mass measurements from smallest to largest is: 10 mg: This is the smallest unit of mass measurement in the given list. It is equal to 0.01 grams or 0.00001 kilograms.

10 g: This is the second smallest unit of mass measurement in the given list. It is equal to 10,000 milligrams or 0.01 kilograms.

10 kg: This is the second largest unit of mass measurement in the given list. It is equal to 10,000 grams or 10,000,000 milligrams.

10 Mg: This is the largest unit of mass measurement in the given list. It is equal to 10,000 kilograms or 10,000,000 grams.

It is important to understand the different units of mass measurement and their conversions, as they are used in many fields, such as science, engineering, and medicine, to measure and calculate the properties of objects and materials.

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Answer:

Independent variable- effect of caffeine

Dependent variable- heart rate

Hypothesis- If a stimulant such as caffeine is administered to earthworm, then its heart rate increases.

Explanation:

The experiment is based on the research question; "Does caffeine increase the heart rate of an earthworm?" We can see from this research question that the independent variable is the effect of caffeine and the response it produces is a change in the heart rate (the dependent variable)

This now leads us to a hypothesis that states thus; 'If a stimulant such as caffeine is administered to earthworm, then its heart rate increases.'

Answer:

1.26x10^25 atoms of hydrogen

Explanation:

because there are 12 atoms of hydrogen in a molecule of glucose, multiply 12 by Avogadro's number (6.02x10^23) to get how many molecules of hydrogen there are in a mole of glucose. Then multiply that number by 1.75, which is the number of moles of glucose there is in this problem.

Answer:

wind

The Movement of Air. Movement of air caused by temperature or pressure differences is wind. Where there are differences of pressure between two places, a pressure gradient exists, across which air moves: from the high pressure region to the low pressure region.

Explanation:

Hope it helps! Correct me if I am wrong :>

Can you please mark me as brainlest?

Its ok if not :>

Answer:

cant see it

Explanation:

Answer:

Molarity = 1.12 mol/L

Explanation:

To make an aqueous solution of Na₂O, the concentration will be calculated by: concentration (c) (or molarity) = number of moles present (n) ÷ volume needed (V) (in litres)

since we don't have moles, we can calculate moles by:

number of moles (n) = mass present (m) (in grams) ÷ molar mass (M) (in grams per mole), which we can find using a standard IUPAC Periodic Table

∴ n(Na₂O) = m/M = 34.8/(22.99×2+16.00) = 0.56147 mol

Now we have the number of moles present, we can calculate concentration:

∴ c(Na₂O) = n/V = 0.56147/0.50L = 1.12 mol/L

Answer:

Thus, to yield the enthalpy of the combustion reaction, we then sum the enthalpies of formation of the products, weighted by their stoichiometric coefficients, and subtract the enthalpy of formation of ethanol (-277.69kJ/mol). The result is ethanol's standard enthalpy of combustion of -1234.79kJ/mol.

In an open container, an equilibrium vapor pressure can be reached as long as the liquid has molecules capable of evaporating and the surrounding space allows for the escape and mixing of vapor molecules with the air.

Vapor pressure is the pressure exerted by the vapor molecules when the liquid and vapor are in equilibrium. It is a measure of the tendency of a liquid to evaporate. At any given temperature, molecules within the liquid have a range of kinetic energies. Some molecules have sufficient energy to overcome intermolecular forces and escape into the gas phase, forming vapor. As more molecules escape, the vapor density increases, creating a pressure known as the vapor pressure.

In an open container, the vapor molecules can freely escape into the surrounding space and mix with the air. Initially, the evaporation rate is high as molecules escape from the liquid surface. As the concentration of vapor molecules increases, collisions between the vapor and liquid surface also result in some molecules returning to the liquid phase, which is called condensation. Eventually, a dynamic equilibrium is established where the rate of evaporation and condensation become equal.

At this equilibrium, the vapor pressure above the liquid remains constant as long as the temperature is constant. The concentration of vapor molecules in the air above the liquid reaches a steady state, and the system is said to be saturated. The equilibrium vapor pressure is determined by the temperature and the characteristics of the liquid, such as its volatility and intermolecular forces.

Therefore, In an open container, an equilibrium vapor pressure can be reached above a liquid.

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There will be  7.58*10^-9 moles of copper atoms in 4.57*10^15 atoms of copper.

A substance's mole is equivalent to 6.022 x 1023 of that material (such as atoms, molecules, or ions). The term "Avogadro's number" or "Avogadro's constant" refers to the number 6.022 1023. To convert between mass and the number of particles, use the mole concept.

Avogadro's number, which is equal to 6.02214076 1023, is the number of units in one mole of any material (defined as its molecular weight in grams). Depending on the substance and the nature of the reaction, the units may be electrons, atoms, ions, or molecules.

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Answer:

Explanation:

2983 Liters did the exam dont worry

Answer: b

Explanation: alpha decay or particle consist of two protons and two neutrons hence it is a helium nucleus.

An alpha particle \(\binom {4} {2}\)He is produced in alpha decay reactions, while the parent nucleus' atomic number and mass number drop by 2 and 4 correspondingly.

Therefore, the final answer is "Option B".

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Created by considering different compounds and their ability to form hydrogen bonds with water molecules. Here's a series that shows increasing hydrogen bonding.

Methane (CH4): Methane consists of only nonpolar covalent bonds and lacks hydrogen bonding. It does not readily form hydrogen bonds with water.

Ethanol (CH3CH2OH): Ethanol contains a hydroxyl (-OH) functional group, which can participate in hydrogen bonding. It can form hydrogen bonds with water, but its hydrogen bonding ability is relatively weaker compared to other compounds in the series.

Acetic Acid (CH3COOH): Acetic acid contains a carboxyl (-COOH) functional group, which can form hydrogen bonds with water. It has a stronger ability to form hydrogen bonds compared to ethanol due to the presence of an additional oxygen atom.

Glycolic Acid (HOCH2COOH): Glycolic acid possesses two hydroxyl groups, allowing for more hydrogen bonding interactions with water. It can form stronger hydrogen bonds compared to acetic acid.

Glycerol (C3H8O3): Glycerol contains three hydroxyl groups, enhancing its ability to form hydrogen bonds with water. The multiple hydroxyl groups increase the number of potential hydrogen bonding sites, resulting in stronger interactions with water.

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Option A is correct which says when a liquid changes into a solid, the molecular motion decreases.

What is molecular motion?

The movement of its component atoms or molecules in a certain direction is referred to as molecular motion.

There is a decrease in the molecular motion when liquid moves towards a solid state. This is because the kinetic energy of the molecules decreases as molecules are moving from a less uniform space to a more uniform phase. As a result, molecular motion decreases.

Hence, option A is correct

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The first two chemical equations are reversible while the other two are irreversible.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

The fossil could tell the scientist that the dessert was once a sea

Answer:

It means that that fossil was probably in an ocean or water at the time. So the desert wasn't always a desert. So I agree with the other guy.

Answer:

C6H12O6+6O2--->6CO2+6H2O

Explanation:

So I went through all the answers and could not find the right one amongst. If I'm not wrong the reaction above is the reaction for respiration. The nearest answer is D but unfortunately the first reactant isn't in accordance with that which the question has given.

a)To determine if milk contains protein, you can conduct a simple protein test. b)For testing the presence of fat in cheese, you can perform a simple lipid test.

To determine if milk contains protein, you can conduct a simple protein test. First, obtain a small sample of milk. Add a few drops of biuret reagent to the sample and observe any color change. If the sample turns violet or purple, it indicates the presence of protein in the milk.

For testing the presence of fat in cheese, you can perform a simple lipid test. First, acquire a small piece of cheese. Crush the cheese and place it in a test tube. Add a few drops of Sudan III solution to the test tube and shake it gently. If the mixture turns red or pink, it suggests the presence of fat in the cheese.

Both tests can provide initial indications of protein in milk and fat in cheese. However, for more accurate and quantitative results, additional laboratory methods, such as the Kjeldahl method for protein analysis and the Soxhlet extraction method for fat analysis, are often employed.

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Given data: Volume of sample, V = 10 mLpH of acetylcholine, pH1 = 7.74pH of final solution, pH2 = 6.04Number of moles of H+ ion released during hydrolysis of acetylcholine, n = ?Formula used: $pH=pK_a + \log_{10}\frac{[A^-]}{[HA]}$Where Ka is the ionization constant.

For weak acids such as acetic acid, Ka = 1.8 × 10−5The balanced equation for hydrolysis of acetylcholine is: Acetylcholine + H2O → Choline + Acetic acid Number of moles of H+ ion released in the hydrolysis of acetic acid, N = ?We know that: Acetic acid is a weak acid and it dissociates in water according to the equation:CH3COOH ⇌ CH3COO– + H+ Initial concentration of CH3COOH (i.e., [CH3COOH]) = ?Concentration of CH3COO– at equilibrium (i.e., [CH3COO–]) = ?

Concentration of H+ ion at equilibrium (i.e., [H+]) = ?As we do not know the concentration of acetylcholine so we can assume it to be x. Then, the concentration of acetic acid formed will also be x as they are in a 1:1 ratio.

Mass of acetylcholine = Number of moles × Molar mass of acetylcholine, i.e., $m = n \times M$

Calculation:

Step 1: Calculation of number of moles of H+ ion released in the hydrolysis of acetyl choline

The Ka value of acetic acid is 1.8 × 10−5 and it is a weak acid.

At pH1 = 7.74:pH1 = pKa + log([A–]/[HA])[A–]/[HA] = antilog(pH1 − pKa)[A–]/[HA] = antilog(7.74 − 4.74) = 301[HA] = [A–] / 301 = 1.24 × 10–3Therefore, [H+] = Ka × [HA] / [A–] = 1.8 × 10−5 × 1.24 × 10–3 / 301 = 7.4 × 10−8MSo, the concentration of H+ ions is 7.4 × 10−8 M.At pH2 = 6.04:pH2 = pKa + log([A–]/[HA])[A–]/[HA] = antilog(pH2 − pKa)[A–]/[HA] = antilog(6.04 − 4.74) = 7.94[HA] = [A–] / 7.94 = 0.126[H+] = Ka × [HA] / [A–] = 1.8 × 10−5 × 0.126 / 7.94 = 2.85 × 10−7MSo, the concentration of H+ ions is 2.85 × 10−7 M.

Number of moles of H+ ion released in the hydrolysis of acetic acid: N = [H+] × V = 2.85 × 10−7 × 10–3 = 2.85 × 10–9 mol

Step 2: Calculation of number of moles of acetylcholine In the given reaction, 1 mole of acetylcholine produces 1 mole of acetic acid.

So, number of moles of acetic acid = number of moles of acetylcholine.

The molar mass of acetylcholine = 146.1 g/mol

The mass of acetylcholine is given by: m = n × M = N × M = 2.85 × 10–9 × 146.1= 4.16 × 10−7 g Number of moles of acetylcholine, n = mass / molar mass = 4.16 × 10–7 / 146.1 = 2.85 × 10–9 mol

Thus, the number of nanomoles of acetylcholine in the original 10 mL sample is 2.85 nanomoles.

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