a student preforming this very same lab starts with 1.50g of salicylic acid and produces 1.75g of acetylsalic acid

There are several factors that can cause a decrease in the rate of dissolution:

Decrease in temperature: As the temperature decreases, the kinetic energy of the particles decreases, and the rate of dissolution also decreases.

Increase in solute concentration: If the solution is already saturated with solute, then adding more solute will cause it to become supersaturated, which can cause a decrease in the rate of dissolution.

Increase in pressure: Increasing the pressure can force more solute into the solution, but it can also cause an increase in the solubility of the solute, which can cause a decrease in the rate of dissolution.

Decrease in surface area: If the solute is in the form of large particles, then breaking it down into smaller particles will increase the surface area available for dissolution and increase the rate of dissolution. Conversely, decreasing the surface area will decrease the rate of dissolution.

Formation of a precipitate: If the solute is capable of forming a precipitate in the solution, then the rate of dissolution may decrease as the solute is removed from the solution and deposited as a solid.

~~~Harsha~~~

The accuracy and precision of the balance are 50%, 51%, and 50%.

Percent error is the calculation of the difference between the actual result and the estimated result.

Given that  the following masses are calculated by three students are 150g, 151g, 150g

The weight of an object is 200g

The percent error will be

actual value - estimated value / estimated value x 100

1. 150 - 200 / 200 x 100 = 50

2. 151 - 200 / 200 x 100 = 51

3. 150 - 200 / 200 x 100 = 50

Thus, the accuracy and precision of the balance is 50%, 51%, and 50%.

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The torque applied to the oil plug is d. 0.84 Nm.

To calculate the torque applied to the oil plug, we need to multiply the force by the distance from the pivot point, which in this case is the oil plug. Torque is represented by the symbol τ (tau) and is measured in Newton meters (Nm).

First, we need to convert the distances given into meters them  by dividing by 100. So, the daughter's distance is 0.07m and the father's distance is 0.04m.

Next, we can calculate the torque applied by each person using the formula:

τ = force x distance

For the daughter: τ = 4.0N x 0.07m = 0.28 Nm
For the father: τ = 14N x 0.04m = 0.56 Nm

Finally, we can add the torques together to find the total torque applied to the oil plug:

Total torque = 0.28 Nm + 0.56 Nm = 0.84 Nm

Therefore, the answer is d. 0.84 Nm.

In summary, torque is the product of force and the perpendicular distance from the pivot point. When two or more forces are acting on an object, the total torque is the sum of the torques. In this case, the father and daughter were both applying a force in the counterclockwise direction to loosen the oil plug, and their individual torques were added together to find the total torque applied.

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The key difference in the vertical location of compounds like chloroform and toluene in an aquifer is primarily due to their respective densities and solubilities. An aquifer is an underground layer of water-bearing permeable rock or unconsolidated materials from which groundwater can be extracted.

The distribution of chemical compounds within an aquifer is influenced by their physical and chemical properties.
Chloroform (CHCl3) is a dense non-aqueous phase liquid (DNAPL), meaning it is denser than water and has limited solubility in water. Due to its high density, chloroform tends to sink vertically in an aquifer, accumulating at the bottom and creating a separate phase. This can result in the contamination of deeper groundwater resources, making remediation efforts more challenging.
On the other hand, toluene (C7H8) is a light non-aqueous phase liquid (LNAPL) and is lighter than water. As a result, toluene tends to float on the surface of the groundwater within an aquifer. This makes the contamination more localized and relatively easier to remediate compared to DNAPLs like chloroform. However, toluene's solubility in water may still lead to groundwater contamination.
In summary, the primary difference in the vertical location of compounds like chloroform and toluene in an aquifer is due to their density and solubility. Chloroform, being a DNAPL, sinks and accumulates at the bottom of an aquifer, while toluene, an LNAPL, floats on the groundwater surface. These characteristics play a crucial role in the contamination and remediation of groundwater resources.

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Answer:

m = 673 g

Explanation:

We need to find the mass of 5.90 mol of \(C_8H_{18}\)

Molar mass of \(C_8H_{18}\) is:

\(M=8\times 12+1\times 18\\\\=114\ g/mol\)

Let m be the mass of 5.90 mol of \(C_8H_{18}\). Using mole concept to find it.

No of moles = mass/molar mass

\(m=5.9\times 114\\\\=672.6\ g\\\\\approx 673\ g\)

So, the required mass is 673 g. Hence, the correct option is (d).

Answer:

673 g

Explanation:

Answer:

Molecules do't break up and reform when a substance boils and cools. Particles stay the same size and shape during state changes.

Explanation:

brainliest will be appreciated

Answer:

the answer is the option 4

Explanation:

i believe its number 4 because when you live near a beach the temperature is cooler

The pressure exerted by the gas is 210.417 atm at 11°C.

It is given that the number of moles is 32.5 and this occupies a volume of 36.5L at 11°C which is 284K. To find the pressure of the gas, the following formula is used:

PV = nRT

By rearranging the formula we get pressure as,

P = (nRT)/V

Here, n is the number of moles, R is the gas constant which is given as 8.314, T is the temperature in Kelvin and V is the volume in liters. By substituting all the values into the formula we get,

P = (32.5x8.314x284)/36.5L

P = 76738.22/36.5

P = 210.41699atm

This value could be approximated as 210.417atm

Therefore, the amount of pressure exerted by the gas of 32.5 moles of 36.5L at 11°C is 210.417 atm.

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Exothermic reactions, release exceeding chemical energy from the reactants. Before its release, the energy is turned into another form, heat or light. C) The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.

An exothermic reaction is the chemical reaction that releases energy as heat or light when the reactants turn into products.

Reactant molecules have more energy than the product molecules, and hence, the remaining energy must leave the system. So part of the chemical energy from the reactants is released as another type of energy  (heat or light).

Usually, oxidation reactions are exothermic.

The correct option is C) The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.

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The given question is incomplete. The complete question is as follows.

Pure potassiom hydrogen phthalate is used for standardization of the sodium hydroxide solution. Suppose that the potassium hydrogen phthalate is not completely dry. Will the reported molar concentration of the sodium hydroxide solution be too high, too low, or unaffected because of the moistness of the potassium hydrogen phthalate? Explain please.

Explanation:

When potassium hydrogen phthalate is not completely dry then it means there will be some water present in it. According to this, actual potassium hydrogen phthalate is diluted because of the presence of water molecules.

Hence, 1 mole of potassium hydrogen phthalate needs 1 mole of NaOH. And, at the equivalence point according to the concept of moles:

No. of moles of potassium hydrogen phthalate = No. of moles of NaOH

Also, the titration of potassium hydrogen phthalate concentration is less because of the presence of water then the number of moles of NaOH calculated will be less.

Thus, we can conclude that the molar concentration of the sodium hydroxide solution be too low.

Answer:

the most common oxidation no.of manganese is + 2 + 3 + 4 + 6 + 7

Explanation:

\(=3h\ x\ \frac{60 \min}{1h }\ x\ \frac{60\ sec}{1\ min}\)

\(=10800\ sec\)

Set up your equation so that your units cancel until you get to the unit you want. Hours and hours would cancel, and min and min would cancel, leaving you with sec which is the unit you want.

Remember: they can only cancel if one is on top and the other is on the bottom.

Answer:

1hr=60minutes

1min=60 seconds

then we have to convert 3hrs into seconds

now,

3*60*60=10,800

Answer: gas are well separated with no regular arrangement.

               liquid are close together with no regular arrangement.

                solid are tightly packed, usually in a regular pattern.

its just gas liquid and solid pls make me brainliest

Explanation:

The pressure of the gas inside the cylinder is 52.90 atm

Given is the number of moles of gas, the temperature and the volume of the gas and we need to find the pressure of the gas inside the cylinder, for this we can use the ideal gas law equation:

PV = nRT

Where:

P = Pressure of the gas (in units of pressure, such as atm)

V = Volume of the gas (in liters)

n = Number of moles of the gas

R = Ideal gas constant (0.0821 L·atm/(mol·K))

T = Temperature of the gas (in Kelvin)

First, let's convert the temperature from Celsius to Kelvin:

T = 25.0 °C + 273.15 = 298.15 K

Now we can substitute the values into the ideal gas law equation:

P × 12.5 L = 27.0 moles × 0.0821 L·atm/(mol·K) × 298.15 K

Simplifying the equation:

P × 12.5 L = 661.2587 L·atm

Dividing both sides by 12.5 L:

P = 661.2587 L·atm / 12.5 L

P ≈ 52.90 atm

Therefore, the pressure of the gas inside the cylinder is approximately 52.90 atm.

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We can use the ideal gas law equation to determine the pressure of a gas within a cylinder:

PV = nRT

Where:

P is the pressure of the gas (in units of pressure, such as atm)

V is the volume of the gas (in units of volume, such as liters)

n is the number of moles of the gas

R is the ideal gas constant (0.0821 L·atm/(mol·K))

T is the temperature of the gas (in units of temperature, such as Kelvin)

we need to convert the temperature from Celsius to Kelvin:

T(K) = T(°C) + 273.15

T(K) = 25.0 °C + 273.15

T(K) = 298.15 K

Now we can plug the data into the ideal gas law equation as follows:

P * 12.5 L = 27.0 moles * 0.0821 L·atm/(mol·K) * 298.15 K

Simplifying the equation:

P = (27.0 moles * 0.0821 L·atm/(mol·K) * 298.15 K) / 12.5 L

Calculating the pressure:

P ≈ 5.046 atm

As a result, the gas inside the cylinder is under a pressure of about 5.046 atm.

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Answer:

hi

Explanation:

The fourth step of the Born-Haber cycle involves the formation of an ionic compound from its constituent ions.

The chemical equation for this step can be written as follows:
M₊(g) ₊ X-(g) → MX(s)
In this equation, M represents a metal cation, X represents a non-metal anion, and MX represents the ionic compound formed by their combination. The phase of each species is indicated in the equation: M₊(g) and X-(g) represent the gaseous ions, while MX(s) represents the solid ionic compound. This step involves the release of energy as the ions come together to form a stable compound.

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Answer: Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. The anode (positive electrode ) is made from impure copper and the cathode (negative electrode) is made from pure copper. Pure copper forms on the cathode.

The false statement about disulfide bond formation is (d) disulfide bonds form spontaneously within the ER because the lumen of the ER is oxidizing. Disulfide bonds do form within the ER, but not spontaneously.

Instead, they are formed by the action of enzymes called protein disulfide isomerases (PDIs). PDIs catalyze the oxidation of cysteine residues to form disulfide bonds. Disulfide bonding (b) stabilizes the structure of proteins, and (a) disulfide bonds do not form under reducing environments. Additionally, disulfide bonds do not (c) grow from both ends, the growth rate is faster at the plus ends. Instead, they are formed between two cysteine residues on the same polypeptide chain or between different polypeptide chains.

The false statement about disulfide bond formation among the given choices is (a) disulfide bonds do not form under reducing environments grow from both ends, the growth rate is faster at the plus ends. This statement is unrelated and incorrect. In reality, disulfide bonds (b) form by oxidation of cysteine pairs, (c) stabilize protein structures, and (d) form spontaneously within the ER due to its oxidizing environment. Disulfide bonds play a vital role in maintaining the proper folding and stability of proteins, especially those secreted or located in extracellular environments.

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Answer:

....................

Explanation:

.....................

After nitrogen compression from 848 mm Hg to 976 mm Hg at a constant temperature, the new volume is approximately 38.2 L.

Hi! To find the new volume of nitrogen when 44.5 L at 848 mm Hg is compressed to 976 mm Hg at a constant temperature, you can use Boyle's Law, which states that the product of the initial pressure and volume (P1V1) is equal to the product of the final pressure and volume (P2V2).

Given:
Initial volume (V1) = 44.5 L
Initial pressure (P1) = 848 mm Hg
Final pressure (P2) = 976 mm Hg

Boyle's Law formula:
P1V1 = P2V2

Step 1: Plug the given values into the formula:
(848 mm Hg)(44.5 L) = (976 mm Hg)(V2)

Step 2: Solve for the final volume (V2):
V2 = (848 mm Hg)(44.5 L) / (976 mm Hg)
V2 ≈ 38.2 L

So, when the nitrogen is compressed from 848 mm Hg to 976 mm Hg at constant temperature, the new volume is approximately 38.2 L.

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Answer:

Explanation:

1.52 tanks of gas will be used to drive 1600 km.

A certain fuel-efficient hybrid car gets gasoline mileage of 55.0 mpg (miles per gallon).

A gallon is a unit of volume in both the US customary and imperial systems of measurement. The US gallon is defined as 231 cubic inches (3.785 liters).

1 mpg = 0.425143707 km/l; to convert miles per gallon to kilometers per liter .

mileage = 23.38 km/l

volume = 1600 km ÷ 23.38 km/l

volume = 68.43 liters; the amount of gasoline needed the trip

tanks = 68.43 l ÷ 45 l

tanks = 1.52

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Answer:

Br

Explanation:

Ionization energy increases across a period.

All other elements are ahead in the period as compared to Br.

The mole fraction of \(CH_3OH\)in the solution is 0.850 or 85.0%.

To calculate the mole fraction (Χ) of methanol (CH3OH) in the given solution, we need to determine the number of moles of CH3OH and the number of moles of \(C_6H_5COOH\)(benzoic acid) in the solution.

First, we can calculate the number of moles of CH3OH using its volume and density:

Mass of CH3OH = Volume x Density = 8.50 mL x 0.792 g/mL = 6.732 g

Number of moles of CH3OH = Mass / Molar mass = 6.732 g / 32.04 g/mol = 0.210 mol

Next, we can calculate the number of moles of \(C_6H_5COOH\)using its mass and molar mass:

Number of moles of C6H5COOH = Mass / Molar mass = 4.53 g / 122.12 g/mol = 0.0371 mol

The total number of moles of solute in the solution is the sum of the moles of CH3OH and C6H5COOH:

Total number of moles = 0.210 mol + 0.0371 mol = 0.247 mol

Finally, we can calculate the mole fraction of \(CH_3OH\)using its number of moles and the total number of moles:

Mole fraction of \(CH_3OH\)= Number of moles of \(CH_3OH\)/ Total number of moles = 0.210 mol / 0.247 mol = 0.850

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Freezing temperature is the temperature at which a liquid turns into a solid. For different liquids or substances the freezing temperature will be different.

In the case of water the freezing point is 0° Celsius. When you convert the 0° Celsius into Fahrenheit, it is 32° Fahrenheit.

At this temperature the water will turn into ice. But we have consider this also that the freezing temperature of other substances can be different.

When we consider other liquids or substances, we can see for example ethanol (alcohol) have the freezing temperature of -114° Celsius (-173° Fahrenheit). Freezing temperature of mercury is -38° Celsius (-37° Fahrenheit).

To convert from Celsius to Fahrenheit,

C = 5/9 (F - 32)

F = (9/5 × C) + 32

C ⇒ Temperature in Celsius.

F ⇒ Temperature in Fahrenheit.

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When carbonic acid (H2CO3) decomposes, it yields nonmetal oxides and water. The decomposition reaction of carbonic acid produces carbon dioxide (CO2) and water (H2O).

This process occurs when carbonic acid loses a water molecule, leading to the formation of carbon dioxide gas and water. The carbon dioxide is a nonmetal oxide, while water is a compound resulting from the combination of hydrogen and oxygen.

Therefore, when carbonic acid undergoes decomposition, the products formed are nonmetal oxide (carbon dioxide) and water.

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Answer:

C. a buffered solution, the pH drops very slightly

Explanation:

can't be A: adding HCl would drop pH

can't be B: solution is buffered so no rapid drops

can't be D: pH would drop by adding HCL

can't be E: solution is buffered so nothing rapid and HCL would cause a drop not rise

if a few drops of concentrated HCl are added to a buffered solution, the pH drops very slightly. Thus option C is correct.

Hydrοchlοric acid is an inοrganic chemical. It is a strοng cοrrοsive acid with a chemical fοrmula HCl. It is alsο knοwn as hydrοgen chlοride οr muriatic acid.

When hydrοgen chlοride is dissοlved in water HCl is fοrmed. It is a simple diatοmic mοlecule. The hydrοgen and chlοrine atοm are cοnnected with a single cοvalent bοnd. The bοnd between them is pοlar as the chlοrine atοm is mοre electrοnegative when cοmpared with the hydrοgen atοm.

A: adding HCl would drop pH, So it can't be this.

B: solution is buffered so no rapid drops, So it can't be this.

D: pH would drop by adding HCL, So it can't be this.

E: solution is buffered so nothing rapid and HCL would cause a drop not rise, So it can't be this.

That leaves us with C. a buffered solution, the pH drops very slightly, which is correct.

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Answer:

a. is tae answer

Explanation:

tamapoyang sagot ko)

Answer:

A

Explanation:

Igneous rock forms from cooled lava