A beaker of cold water is placed in a hot water bath at 90°C.Explain what happens in terms of heat diffusion.

the pH at the neutralization point is:  \(pH = -log[H3O^+] = -log(1.68 \times 10^-4) = 3.77\)

To determine the pH at the neutralization point, we first need to calculate the moles of   \(NaOH\) used to neutralize the acetic acid:

moles of   \(CH3COOH =\) (volume in liters) x (concentration in mol/L) = \((25/1000) x 10 = 0.25 mmol\)

moles of  \(NaOH =\) (concentration in mol/L) x (volume in liters)  \(= 0.050 x\)(volume in liters)

At the neutralization point, the moles of   \(NaOH\) will be equal to the moles of  \(CH3COOH\) :

\(0.25 mmol = 0.050 \times\) (volume in liters)

volume in liters \(= 5 mL\)

So, it takes \(5 mL\) of  \(0.050 M NaOH\) to neutralize \(25 mL\) of 0.10 M \(CH_3COOH.\)

Now, we need to calculate the concentration of  \(CH3COOH\) and  \(CH3COO-\)(acetate ion) in the solution after the addition of 5 mL of NaOH:

moles of CH3COOH remaining = moles of \(CH_3COOH\) initially - moles of NaOH added

\(= 0.25 mmol - 0.050 mmol = 0.20 mmol\)

volume of final solution \(= 25 mL + 5 mL = 30 mL\)

concentration of  \(CH_3COOH =\) (moles of \(CH_3COOH\) remaining) / (volume in liters) \(= 0.20 mmol / 0.030 L = 6.67 mM\)

concentration of CH3COO- = (moles of NaOH added) / (volume in liters) \(= 0.050 mmol / 0.030 L = 1.67 mM\)

Next, we can use the equilibrium expression for the dissociation of acetic acid to calculate the pH:

\(CH3COOH + H2O \rightleftharpoons CH3COO- + H3O+\)

\(Ka = [CH3COO-][H3O+] / [CH3COOH]\)

At the neutralization point, \([CH3COOH] = [CH3COO-] = 0.5 \times 6.67 mM = 3.33 mM\)

\(Ka = 1.8 x 10^-5\)

Solving for \([H3O^+]\), we get:

\([H3O+] = \sqrt (Ka x [CH3COOH]) = \sqrt (1.8 \times 10^-5 \times 3.33 \times 10^-3) = 1.68 \times 10^-4 M\)

Therefore, the pH at the neutralization point is:  \(pH = -log[H3O^+] = -log(1.68 \times 10^-4) = 3.77\)

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Answer:

4.06 g of Mg(OH)2

Explanation:

The equation of the reaction is;

2NaOH(aq) + MgCl2(aq) -------> Mg(OH)2(s) + 2NaCl(aq)

Number of moles of NaOH= 57/1000 * 3.40 = 0.19 moles

Number of moles of MgCl2 = 38/1000 * 1.9 = 0.07 moles

We must find the limiting reactant. This is the reactant that yields the least amount of the solid.

From the reaction equation;

2 moles of NaOH yields 1 mole of Mg(OH)2

0.19 moles of NaOH yields 0.19 * 1/2 = 0.095 moles of Mg(OH)2

Also;

1 mole of MgCl2 yields 1 mole of Mg(OH)2

0.07 moles of MgCl2 also yields 0.07 moles of Mg(OH)2

Hence MgCl2 is the limiting reactant and 0.07 moles of Mg(OH)2 is produced.

Mass of Mg(OH)2 produced = number of mole * molar mass

molar mass of Mg(OH)2 = 58 g/mol

Mass of Mg(OH)2 produced = 0.07mol * 58 g/mol = 4.06 g of Mg(OH)2

Answer:

Explanation:

2NaNO₃ = 2NaNO₂ + O₂

NaNO₃    =     NaNO₂   +    1/2 O₂

- 468 kJ           -369 kJ           0  kJ

enthalpy of decomposition reaction

= - 369 - ( - 468 ) kJ

= 99 kJ / mol .      

In this compound, there would be five proton NMR signals,

We know that the acronym NMR means nuclear magnetic resonance. It has to do with the kind of spectrum in which the kind of chemical environment where the proton is found would impact the spectrum that is observed in the compound.

The first thing that we need to look at and find out in the image is to be able to find out the number of chemical environments that we have in the compound as we can see it in the image.

By studying the compound closely, we can see that there are four different proton chemical environments that we can be able to see and map out from the compound and it is these chemical environments that tell us the number of signals to expect.

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Ernie's behavior is unsafe because,

Lydia's behavior is appropriate because

This behavior is important because

In that picture, we see Lydia well clad in her laboratory suit, and gloves. She also maintains a serious work ethic as she views the solution in the flat bottom flask.

This is the recommended attitude in the laboratory because it allows for safety and accuracy.

Ernie, on the other hand, runs around the laboratory while playing with the microscope. He could slip and have a chemical fall on him thus causing an injury.

His behavior causes distractions and might also cause mistakes for scientists observing and recording data.

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we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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Answer:

d

Explanation:

The material that represents the crust is option d. Thin layer of plaster.

It is the outermost shell of a planet i.e. terrestrial.  The crust of the earth should be split into older, thicker continental crust, etc. Also, it is made of solid rocks and minerals. Due to this, the thin plaster layer represents the material for the crust.

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Carbon atoms may thus form bonds to as many as four other atoms. For example, in methane (CH 4​start subscript, 4, end subscript), carbon forms covalent bonds with four hydrogen atoms

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Answer:

freezing point is 0°C and boiling point is 100°C

Answer:

Dude you need to provide an image because almost everyone is not gonna know what u talkin about.

Explanation:

Answer:

the mirror is 12 cm away from the image

Explanation:

; the image will be virtual and it will form at 12 cm distance behind the mirror.

Precision relates to the consistency and reproducibility of measurements, while accuracy reflects how close measurements are to the true value.

Precision and accuracy are two important concepts in the context of errors in measurements. While they both pertain to the quality of data, they refer to different aspects.

Precision refers to the degree of consistency or reproducibility in a series of measurements. It reflects the scatter or spread of data points around the average value. If the measurements have low scatter and are tightly clustered, they are considered precise. On the other hand, if the measurements have a high scatter and are widely dispersed, they are considered imprecise.

Accuracy, on the other hand, refers to the closeness of measurements to the true or target value. It represents how well the measured values align with the actual value. Accuracy is achieved when measurements have a small systematic or constant error, which is the difference between the average measured value and the true value.

Errors in measurements can be classified into two types: random errors and systematic errors.

Random errors are associated with the inherent limitations of measurement instruments or fluctuations in the measurement process. They lead to imprecise data and affect the precision of measurements. Random errors can be reduced by repeating measurements and calculating the average to minimize the effect of individual errors.

Systematic errors, on the other hand, are caused by consistent biases or inaccuracies in the measurement process. They affect the accuracy of measurements and lead to a deviation from the true value. Systematic errors can arise from factors such as instrumental calibration issues, environmental conditions, or experimental techniques. These errors need to be identified and minimized to improve the accuracy of measurements.

In summary, precision refers to the degree of consistency or reproducibility of measurements, while accuracy refers to the closeness of measurements to the true value. Random errors affect precision, while systematic errors affect accuracy. To ensure high-quality measurements, both precision and accuracy need to be considered and appropriate techniques should be employed to minimize errors.

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Answer:

A peninsula ( Latin: paeninsula from paene "almost" and insula "island") is a landform surrounded by water on most of its border while being connected to a mainland from which it extends.

Explanation:

CAN I GET BRAINLIEST

Answer:

The intermolecular forces increase in the following order:

C2H6 < CH4 < CH3F < NH3

The reasoning behind this order is as follows:

C2H6 (ethane) is a nonpolar molecule with only dispersion forces, which are the weakest intermolecular forces.

CH4 (methane) is also nonpolar and only has dispersion forces, but it has a slightly larger molecular weight than ethane, which leads to stronger dispersion forces.

CH3F (fluoromethane) is polar and has dipole-dipole forces in addition to dispersion forces. The dipole-dipole forces are stronger than the dispersion forces in this case.

NH3 (ammonia) is also polar and has hydrogen bonding, which is a stronger type of dipole-dipole force.

Explanation:

For 392 mL of solution, 5.41 g of ammonia must be dissolved in water.

Ammonia is an odourless gas that has a potent scent. It is a stable binary hydride and the most fundamental pnictogen hydride. Ammonia is an odourless gas that has a potent scent. It is a stable binary hydride and the most fundamental pnictogen hydride.

The equation: can be used to determine the mass of ammonia required to create a 0.6542 M solution.

Mass (g) = Volume (L) *Molarity (M) *  Molecular weight (g/mol)

Mass (g) = 0.6542 M * 0.392 L * 17.031 g/mol

Mass (g) = 5.41 g of ammonia

Therefore,5.41 g of ammonia have to be dissolved in water to form 392 mL of solution.

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The mass of NaCl in 44mL of a 1.6M solution is 4.1grams.

The mass of NaCl can be calculated by using the following formula;

Molarity = no. of moles ÷ volume

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

no of moles = 1.6M × 0.044L = 0.07moles

The mass of the sodium chloride solution can be calculated by multiplying the molar mass of the salt by the number of moles present in the solution.

The molar mass of NaCl solution can be calculated as follows;

M.M = 23g/mol + 35.5g/mol = 58.5g/mol

mass of NaCl = 58.5 × 0.07 = 4.1grams.

Therefore, 4.1grams is the mass of NaCl solution.

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Explanation:

Arsenic is a solid chemical element that is used especially in wood preservatives, alloys, and semiconductors and is extremely toxic in both pure and combined forms.

A poisonous trioxide As2O3 or As4O6 of arsenic is used especially as an insecticide or weed killer.

Answer:

Any molecule which has a hydrogen atom attached directly to an oxygen or a nitrogen is capable of hydrogen bonding. Hydrogen bonds also occur when hydrogen is bonded to fluorine, but the HF group does not appear in other molecules.

So, the HF no. c) is a right answer.

Based on the formula to determine the freezing point depression of the solvent, the freezing point of the solution is 263.85 K.

The freezing point of a substance is the temperature at which the liquid changes to solid without any further decrease in temperature occurring during the process.

The addition of solute substances in liquids usually lowers the freezing point of the liquid solvent.

The formula to determine the freezing point depression of solvent is given below:

where'

The molality of the given solution = moles of solute/kg of solvent

moles of solute = 46/92

mass of solvent = 100 g or 0.1 kg

Molality of solution = (46/92) / 0.1

Molality of solution = 5

for glycerine, i = 1

ΔT = ΔT = 1 * 1.86 * 5

ΔT = 9.3

The freezing point of the solution = 273.15 - 9.3

The freezing point of the solution = 263.85 K

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The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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Answer:

a. The Zn and HCl both retained their identity.

The relative mass of an electron is 1/1840 the mass of a C-12 atom. Hence, option B is correct.

An electron is a negatively charged subatomic particle.

An electron is very small, about 1/1,837th the mass of a proton. Atomic Weights Atomic mass of an atom is expressed in atomic mass units (amu) which are approximately \(1.66 X 10^{-24}\) grams. A more conventional way of expressing the mass of an atom is Atomic Weight.

Atomic mass units are expressed relative to the atomic mass unit of an unbound neutral carbon-12 atom.

Hence, the relative mass of an electron is 1/1840 the mass of a C-12 atom.

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The piece of information most useful in evaluating this claim is the research study the group cites as evidence was proven to be inaccurate (Option C).

A relatively recent publication indicated that certain vaccines might produce autism in children, thereby raising concerns about their use.

However, it has been shown that the scientific evidence in this publication may be erroneous and therefore the publication was retracted.

In conclusion, The piece of information most useful in evaluating this claim is the research study the group cites as evidence was proven to be inaccurate (Option C).

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This means that the ratio of anhydrous compound to water in the hydrate is 1:2. Therefore, the value of "n" in the hydrate formula is 2.

To determine the value of "n" in the hydrate formula, we need to use the given information to calculate the number of moles of anhydrous compound and water in the sample, and then use the mole ratio between them to determine the value of "n".

First, we can calculate the number of moles of anhydrous compound:

moles of anhydrous compound = mass / molar mass

moles of anhydrous compound = 85.25 g / 208 g/mol

moles of anhydrous compound = 0.4091 mol

Next, we can calculate the number of moles of water:

moles of water = mass / molar mass

moles of water = 14.75 g / 18.015 g/mol

moles of water = 0.8180 mol

Anhydrous Compound - nH₂O

The mole ratio between the anhydrous compound and water is:

moles of anhydrous compound : moles of water

0.4091 mol : 0.8180 mol

We can simplify this ratio by dividing both sides by the smaller value:

0.4091 mol / 0.4091 mol : 0.8180 mol / 0.4091 mol

1 : 2

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1.36 g of HCO2H is obtained by reacting 2.65 g of FeS, 1.32 g of H2S, and 1.32 g of CO2 if the reaction results in a 50.0% yield.

What is Percentage Yield?

Percentage yield is a measure of the efficiency of a chemical reaction, expressed as the percentage ratio of the actual yield to the theoretical yield. The theoretical yield is the amount of product that would be obtained if all the limiting reagent were consumed, and no side reactions occurred.

FeS + 2H2S + CO2 → Fe(SCOOH)2 + H2O + H2S

The molar mass of FeS is 87.91 g/mol, the molar mass of H2S is 34.08 g/mol, the molar mass of CO2 is 44.01 g/mol, and the molar mass of HCO2H is 90.03 g/mol.

First, we need to calculate the limiting reactant in the reaction. We can do this by calculating the number of moles of each reactant using their molar masses:

moles of FeS = 2.65 g / 87.91 g/mol = 0.0302 mol

moles of H2S = 1.32 g / 34.08 g/mol = 0.0387 mol

moles of CO2 = 1.32 g / 44.01 g/mol = 0.0299 mol

The limiting reactant is FeS because it produces the least amount of product. According to the balanced equation, one mole of FeS produces 1 mole of HCO2H, so the number of moles of HCO2H produced is also 0.0302 mol.

Now, we can calculate the mass of HCO2H produced using its molar mass:

mass of HCO2H = 0.0302 mol × 90.03 g/mol = 2.72 g

However, the question tells us that the reaction has a 50.0% yield, so we need to multiply the mass of HCO2H by 0.5 to get the actual amount produced:

actual mass of HCO2H = 2.72 g × 0.5 = 1.36 g

Therefore, 1.36 g of HCO2H is obtained by reacting 2.65 g of FeS, 1.32 g of H2S, and 1.32 g of CO2 if the reaction results in a 50.0% yield.

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The symbol, name, atomic number, mass number, charge, number of protons, number of neutrons, and number of electrons of the given atoms are as follows:

2.

3.

4.

5.

6.

The atomic number of an element is the number of protons in the nucleus of an atom.

For a neutral atom, the number of protons is equal to the number of electrons.

For a negatively-charged atom, the number of electrons is greater than the proton number by the size of the charge on the atom.

For a positively-charged atom, the number of electrons is less than the proton number by the size of the charge on the atom.

The mass number is the sum of the proton and neutron in the nucleus. Hence, the neutron number is the difference between the mass number and the atomic number.

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Answer:

see the photo

Explanation:

it was the answer

Answer::

Explanation::