1.) An unknown hydrate, AC\cdotXH2O, has a mass of 1.000 g before heating, and has a mass of 0.738 g after heating. What is the experimental percentage of water in the hydrate?
2.) If the anhydrous compound (AC) in the preceeding problem has a molar mass of 101 g/mol, what is the water of crystallization (X) and the formula for the hydrate?

Yes, the molecule formaldehyde (CH₂O) is polar. In order to determine the polarity of a molecule, we look at the electronegativity difference between the atoms involved. In the case of formaldehyde, there is a significant difference in electronegativity between carbon (C) and oxygen (O) atoms.

Oxygen is more electronegative than carbon, which means it attracts the shared electrons more strongly. As a result, the oxygen atom in formaldehyde gains a partial negative charge (δ-) while the carbon atom gains a partial positive charge (δ+). Additionally, the geometry of formaldehyde, which has a bent structure, also contributes to its polarity. The presence of a polar bond and the asymmetric distribution of charge in the molecule make formaldehyde polar overall. This polarity has implications for its chemical properties and reactivity.

To know more about thermosetting plastic visit:

https://brainly.com/question/32232170

#SPJ11

The anhydrous magnesium sulfate required to dry a di-ethyl ether solution after performing extractions involving water is enough such that some powder remains free flowing in solution with swirling without clumping.

Extraction is a process which involves transfer of a solute from one phase to another. A cup of tea or coffee prepared represents a process of extraction.The flavor and odor components are extracted from the dried material into the water.

Anhydrous magnesium sulphate works as a drying agent. Magnesium sulfate (MgSO₄) works by forming complex with H₂O in the solvent. It forms a hydrated MgSO₄ precipitate. This precipitate is then filtered out by gravity, which yields an anhydrous product. Due to the high affinity towards water molecules, MgSO₄ removes any amount of water from the extracts.

Due to the presence of an active hydrogen atom, ethyl alcohol reacts with magnesium metal. Diethyl ether, does not have any replaceable hydrogen atom. So, it does not react with magnesium sulfate, therefore, can be dried by anhydrous magnesium sulfate.

Complete question is -

How much anhydrous magnesium sulfate is required to dry a diethyl ether solution after preforming extractions involving water?

Select answer and submit.

a. Enough to cover the tip of your scoopula once

b. 1 g/mL of diethyl ether

c. Enough such that some powder remains free flowing in solution with        

   swirling without clumping

d. Anhydrous magnesium sulfate doesn't dry diethyl ether

To learn more about extraction,

brainly.com/question/14038722

#SPJ1

Answer:

well the answer is 99.2lbs I know that

Answer:

wow only six points, you have to amp it up a little

Explanation: because

The range for the target ph of a buffer solution that would favours ph stabilization unders this condition in (4.75-4.85).

What is Henderson Hasselback equation ?

The Henderson-Hasselbalch equation, pH = pKa + log([A]/[HA]), can be used to determine the pH of a buffer. The terms "HA" and "A" in this equation stand for the equilibrium concentrations of the conjugate acid-base pair that were employed to make the buffer solution.

What is acetate?

A proton is taken out of the carboxy group of acetic acid to produce acetate, a monocarboxylic acid anion. It performs a function as a Saccharomyces cerevisiae metabolite as well as a human metabolite. The base is a conjugate of an acetic acid. ChEBI. Alternatives to ACETIC ACID

The Henderson Hasselback equation for a suitable acetic acid / acetate buffer-

Ph= Pka + log (salt)/(acid)

(salt) = (acetate)

(acid) = (acetic acid)

now, CH3 COOH dissociates as

CH3COOH ⇔ CH3COOH +H

Pka for CH3COOH = 4.75

If a chemical reaction produced hydroxide ions, then CH3COOH gets consumed and more acetate ions with produces. This leads to change in Ph of the solution as due (CH3C00H-) increases the ph absence increases.

The range for the target ph of a buffer solution that would favours ph stabilization unders this condition in (4.75-4.85)

The buffer capacity is the ability of a given buffer to resist any changes in ph when small amount of acid or base added to it.The buffer capacity of a mixed weak acid( here Acetic acid)-base (NaOH) buffer is much greater when the individual pKa values are in close proximity with each other.

Therefore, The range for the target ph of a buffer solution that would favours ph stabilization unders this condition in (4.75-4.85).

Learn more Henderson Hasselback equation about from the given link.

https://brainly.com/question/13423434

#SPJ4

Answer: come on man its not that hard

Explanation:

From the percentage mass of water in copper(ii) sulfate pentahydrate, mass of water in 4.26 g of copper(ii) sulfate pentahydrate is 1.54 g of water.

The mass percentage of water in 1 mole of copper(ii) sulfate pentahydrate is determined using the following formula below:

The mass of water in the compound and the mass of 1 mole of the compound is determined from the molar mass of the compound.

The molar mass of copper(ii) sulfate pentahydrate is determined from the formula of the compound as follows:

Formula f copper(ii) sulfate pentahydrate = CuSO₄.5H₂O

Molar mass of copper(ii) sulfate pentahydrate = 63.5 + 32 + 16 * 4 + 18 * 5

Molar mass of copper(ii) sulfate pentahydrate = 249.5 g/mol

Mass of water in compound = 18 * 5 = 90 g

Percentage mass of water = 90/249.5 * 100% = 36.1 %

Mass of water in grams in 4.26 g of copper(ii) sulfate pentahydrate = 36.1% * 4.26 g

Mass of water in grams in 4.26 g of copper(ii) sulfate pentahydrate = 1.54 g of water.

Learn more about percentage mass at: https://brainly.com/question/23856068

#SPJ1

Heat is the energy that a thing possesses as a result of the movement of its atoms and molecules, which are always bouncing off of one another and other objects. An object's atoms and molecules move more quickly when we add energy to it, which increases the object's energy of motion or heat.

The gas will travel more quickly in the container if the temperature is raised. This occurs as a result of the particles' increased kinetic energy caused by heating. There will be more collisions between particles if they are traveling faster.

A substance's atoms and molecules move more quickly when it is heated. Whether the substance is a solid, liquid, or gas, this occurs.

To know more about  heat energy, visit;

https://brainly.com/question/13411214

#SPJ6

The empirical formula of the compound is CH₂O. This means that for every one carbon atom, there are two hydrogen atoms, and one oxygen atom.

To determine the empirical formula, we need to find the simplest ratio of atoms in the compound. We can assume we have 100 grams of the compound, which means we have 54.5 grams of carbon, 9.1 grams of hydrogen, and 36.1 grams of oxygen.

Next, we calculate the number of moles for each element by dividing the mass by their respective molar masses: carbon (12 g/mol), hydrogen (1 g/mol), and oxygen (16 g/mol).

Carbon: 54.5 g / 12 g/mol = 4.54 mol

Hydrogen: 9.1 g / 1 g/mol = 9.1 mol

Oxygen: 36.1 g / 16 g/mol = 2.26 mol

To obtain the simplest whole-number ratio, we divide the number of moles of each element by the smallest number of moles (2.26 mol in this case).

Carbon: 4.54 mol / 2.26 mol = 2

Hydrogen: 9.1 mol / 2.26 mol ≈ 4

Oxygen: 2.26 mol / 2.26 mol = 1

Thus, the empirical formula of the compound is CH₂O, indicating that it contains two carbon atoms, four hydrogen atoms, and one oxygen atom.

Learn more about CH₂O here:

https://brainly.com/question/32643527

#SPJ11

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

Learn more about mixture at: https://brainly.com/question/12160179

#SPJ1

Answer:

Carbon is found in the hydrosphere dissolved in ocean water and lakes. Carbon is used by many organisms to produce shells. Marine plants use cabon for photosynthesis. The organic matter that is produced becomes food in the aquatic ecosystem.

Answer:

B. They don't have enough energy to overcome the attractions between them.

Answer:They don't have enough energy to overcome the attractions

between them.

Explanation:

A. They have no motion and cannot even vibrate in place.

B. They don't have enough energy to overcome the attractions

between them.

C. They bounce off the walls of their container and back into place.

D. They move independently of one another.

Answer:

A, D, E

Explanation:

Answer:

Made of cells

Explanation:

cells are the basic building blocks of life

Answer:

Hydrogen peroxide does not make a good antiseptic for open wounds because catalase in human tissues neutralizes it.

Explanation:

The neutralization of hydrogen peroxide by the enzyme catalase present in the cells of an open wound can cause damage to the cells and impede the healing process, making hydrogen peroxide not a good antiseptic for open wounds.

When it comes in contact with the living tissue, the enzyme catalase catalyzes the breakdown of the hydrogen peroxide into water and oxygen. This process can generate heat and cause damage to the cells in the area. Additionally, the breakdown of hydrogen peroxide can also generate free radicals, which can further damage the cells in the wound. Furthermore, the neutralization of hydrogen peroxide by catalase can cause the wound to dry out, making it more difficult for new cells to grow and the wound to heal.

To learn more about hydrogen peroxide click here:

https://brainly.com/question/29102186

#SPJ4

If 170 milligrams of a radioactive substance decays to 85 g after 16 hours. Then, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.

The decay of the radioactive substance follows an exponential decay equation of the form:

\(N(t) = N_{o} \times e^{-kt}\)

Where:

N(t) is the amount of substance remaining at time t

N₀ is the initial amount of substance

k is the decay constant

t is the time elapsed

Given to us is N₀ = 170 mg and N(16) = 85 mg. We can use this information to find the decay constant, k.

\(85 = 170 \times e^{-k \times 16}\)

Dividing both sides by 170:

\(0.5 = e^{-k \times 16}\)

To solve for k, we can take the natural logarithm (ln) of both sides:

ln(0.5) = -k × 16

from this, the value of k comes out to be:

k = 0.0431

Now we can use the decay equation to find the amount of substance remaining after 21 hours, N(21):

\(N(21) = 170 \times e^{-0.0431 \times 21}\)

Calculating this expression:

N(21) = 75.2

Therefore, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.

Learn more about radioactive decay here:

https://brainly.com/question/1770619

#SPJ4

To determine the number of moles of H2SO4 produced from 5 moles of Na2SO4 we must use stoichiometry.

It is important to understand the stoichiometry concept. Stoichiometry is the calculation of quantities in chemical reactions. It deals with the calculations of reactants and products in chemical reactions. It is used to calculate the reactants or products of a chemical reaction. The stoichiometry concept is expressed using balanced chemical equations. In this case, the balanced chemical equation is:H2SO4 + 2 NaOH → Na2SO4 + 2 H2OThe stoichiometry concept can be applied to find the number of moles of H2SO4 produced from 5 moles of Na2SO4.

The first step is to identify the mole ratio between the two compounds. The mole ratio between H2SO4 and Na2SO4 is 1:1. This means that one mole of H2SO4 is produced for every one mole of Na2SO4.Using the mole ratio and the given number of moles of Na2SO4, we can calculate the number of moles of H2SO4 produced:1 mole of Na2SO4 produces 1 mole of H2SO4. Therefore,5 moles of Na2SO4 produce 5 moles of H2SO4.Answer:5 moles of H2SO4 are produced from 5 moles of Na2SO4.

To know more about moles visit:

https://brainly.com/question/15209553

#SPJ11

because of its milk-like appearance. ... Since the dissociation of this small amount of dissolved magnesium hydroxide is complete, magnesium hydroxide is considered a strong electrolyte. Its low solubility makes it a weak base.

All of the calcium iodide will react, and the sodium sulfate will be in excess.

To determine the products of the reaction between sodium sulfate (Na2SO4) and calcium iodide (CaI2), we need to consider the possible double displacement reaction that takes place.

The balanced chemical equation for the reaction is:

Na2SO4 + CaI2 -> 2NaI + CaSO4

According to the equation, sodium sulfate reacts with calcium iodide to produce sodium iodide and calcium sulfate.

Now, let's calculate the moles of each reactant:

Moles of Na2SO4 = molarity * volume = 0.114 mol/L * 0.0350 L = 0.00399 mol

Moles of CaI2 = molarity * volume = 0.125 mol/L * 0.0350 L = 0.00438 mol

From the balanced equation, we can see that the reaction occurs in a 1:1 stoichiometric ratio between Na2SO4 and CaI2. Since the number of moles of CaI2 (0.00438 mol) is slightly higher than the number of moles of Na2SO4 (0.00399 mol), CaI2 is the limiting reactant.

The products of the reaction are sodium iodide (NaI) and calcium sulfate (CaSO4).

Know more about calcium iodide here;

https://brainly.com/question/29694775

#SPJ11

a) If the student did not clean the buret before starting the titration and droplets of the titrant were clinging to the inside surface of the barrel, then the experimentally determined molarity of NaOH would be too high.

b) If the buret tip was not completely filled with NaOH solution when the titration was begun, then the experimentally determined molarity of NaOH would be too low.

c) If the student spilled KHP on the balance pan when adding it to the weighing boat, the experimentally determined molarity of NaOH would be too high.

Molarity refers to the amount of a substance per unit volume of solution and is used to describe the concentration of a chemical species, specifically a solute, in a solution.

The most frequent measure of molarity in chemistry is the number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units.

Learn more about molarity at: https://brainly.com/question/14469428

#SPJ1

In summary, not cleaning the buret and not filling the buret tip completely would result in a lower determined molarity of NaOH, while spilling KHP on the balance pan would result in a higher determined molarity of NaOH.

a) If a student did not clean the buret before beginning the titration and noticed droplets of titrant clinging to the inside surface of the barrel, the determined molarity of NaOH would likely be too low. This is because some of the NaOH would be left on the walls of the buret and not be accounted for in the titration, leading to an underestimation of the amount used.

b) If the buret tip was not completely filled with NaOH solution when the titration began, the determined molarity of NaOH would also be too low. This is because the initial volume of NaOH in the buret would be underestimated, and consequently, the total amount of NaOH used in the titration would be underestimated as well.

c) If the student added KHP to the weighing boat on the balance pan and spilled it on the pan, the determined molarity of NaOH would be too high. This is because the actual amount of KHP used in the titration would be less than the recorded value, leading to an overestimation of the NaOH required for neutralization and therefore, an overestimation of its molarity.

To know more about Molarity:

https://brainly.com/question/14469428

#SPJ11

Answer:

Explanation:

The question requires us to calculate the volume (in L) of a gas under the conditions given.

The following information was provided by the question:

Initial volume of gas = V1 = 2.00 L

Initial temperature of gas = T1 = 25.0 °C

Initial pressure of gas = P1 = 1.08 atm

Final temperature of gas = T2 = 100 °C

Final pressure of gas = P2 = 1.50 atm

To solve this problem, we'll need to apply the equation of ideal gases (shown below) twice: first, to determine the number of moles of gas, and again to calculate the volume of gas under the final conditions. Note that we'll determine the number of moles of gas under the initial conditions because this amount won't change (as we're talking about the same sample of gas).

A dental hygienist determines that a county's public water supply has 0.9 parts per million fluoride. The county executive has been informed that there are 0.9 parts per million (ppm) of fluoride concentration in the region.

Fluoride levels in drinking water must currently not exceed 4.0 mg/L. The Maximum Contaminant Level (MCL), often known as the upper limit, is this. It applies to water from public water systems.

For children seven years of age and older who are at a high risk of acquiring caries, doses of 1,350 ppm to 1,500 ppm are indicated. In most nations, toothpaste with fluoride up to 1,500 ppm is sold over-the-counter. On prescription, higher doses (2,800 ppm and 5,000 ppm) are offered.

Learn more about concentration visit: brainly.com/question/10929330

#SPJ4

The cart accelerated at a constant rate of approximately 0.8 m/s². Option (B) is correct.

Option B is the best description based on the graphed position data during the 7-second time interval. The cart's acceleration can be determined by analyzing the shape of the position-time graph.

If the cart was stationary, the position-time graph would be a horizontal line (option C). If the cart moved at a constant velocity, the graph would be a straight line inclined at a constant angle (option D).

However, the graph likely shows a curved line, indicating changing position over time. This suggests that the cart experienced acceleration. To further confirm, calculate the acceleration:

Acceleration (a) = Δv / Δt,

where Δv is the change in velocity and Δt is the change in time.

Given the time interval is 7 seconds, and the initial and final velocities are likely different, you can calculate the average acceleration. If the average acceleration is approximately 0.8 m/s², then option B is correct.

The graphed data aligns with the scenario of constant acceleration, supporting option B.

To learn more about acceleration  here

https://brainly.com/question/2303856

#SPJ3

Answer:

The unit of energy you measure in is joule.

Answer:

A) 22

Explanation:

The balanced chemical equation for the combustion of carbon monoxide tells us that:

2CO(g) + O2(g) → 2CO2(g)

This means that for every 2 moles of carbon monoxide (CO) that react, it produces 2 moles of carbon dioxide (CO2). Therefore, the molar ratio of CO to CO2 is 2:2, or simply 1:1.

To find the mass of CO2 produced from 14 g of CO, we first need to determine the number of moles of CO that are present in 14 g. The molar mass of CO is 28 g/mol (12 g/mol for carbon + 16 g/mol for oxygen).

Number of moles of CO = mass of CO / molar mass of CO

Number of moles of CO = 14 g / 28 g/mol

Number of moles of CO = 0.5 mol

Since the molar ratio of CO to CO2 is 1:1, we can conclude that 0.5 mol of CO will produce 0.5 mol of CO2.

Now, we can calculate the mass of CO2 produced from 0.5 mol of CO2:

Mass of CO2 = number of moles of CO2 x molar mass of CO2

Mass of CO2 = 0.5 mol x 44 g/mol (molar mass of CO2)

Mass of CO2 =22 g

Therefore, the correct answer is A) 22 g of carbon dioxide is produced from 14 g of carbon monoxide.

Hope this helps!

⇒ 0.018

-use pH=-log[H3O+]

-solve for H3O+

The equilibrium constant (Ka) for the monoprotic acid dissolved in water to produce a 0.0107 M solution with a pH of 6.47 is approximately 1.08 x 10^(-5)

To find the equilibrium constant (Ka) for the monoprotic acid dissolved in water to produce a 0.0107 M solution with a pH of 6.47, follow these steps:

1. Use the pH to find the hydrogen ion concentration, [H⁺]:
pH = -log[H⁺]
6.47 = -log[H⁺]
[H⁺] = 10^(-6.47) ≈ 3.39 x 10^(-7) M

2. Write the equilibrium expression for the monoprotic acid:
HA + H₂O ⇌ H₃O+ + A⁻
Ka = [H₃O⁺][A⁻]/[HA]

3. Set up the initial and equilibrium concentrations:
Initial:
[HA] = 0.0107 M
[H₃O⁺] = 0 M
[A⁻] = 0 M

Equilibrium:
[HA] = 0.0107 - x M
[H₃O⁺] = x M
[A⁻] = x M

4. Substitute the equilibrium concentrations into the Ka expression:
Ka = (x)(x) / (0.0107 - x)

5. Replace x with the calculated [H⁺] value from step 1:
Ka = (3.39 x 10^(-7))(3.39 x 10^(-7)) / (0.0107 - 3.39 x 10^(-7))

6. Solve for Ka:
Ka ≈ 1.08 x 10^(-5)

So, the equilibrium constant (Ka) for the monoprotic acid dissolved in water to produce a 0.0107 M solution with a pH of 6.47 is approximately 1.08 x 10^(-5).

Learn more about equilibrium constants at https://brainly.com/question/3159758

#SPJ11

The higher thermal conductivity of crystalline polymers compared to non-crystalline polymers is due to the more effective coordinated vibration of the chains within the crystalline regions.

Crystallinity refers to the degree of order and organization of the polymer chains within the material. In crystalline polymers, the chains form an ordered structure while in non-crystalline polymers, the chains are randomly oriented.

This ordered structure allows for more effective transfer of energy through vibrations of the polymer chains, resulting in higher thermal conductivity.

At the molecular level, the higher thermal conductivity of crystalline polymers is due to the increased number of contacts that the polymer chains have with each other.

The ordered structure of the crystalline regions allows for the polymer chains to be in closer contact with each other, which facilitates the transfer of thermal energy from one molecule to the other. This is because the molecules within the crystalline regions are able to vibrate in a coordinated manner, allowing for the transfer of energy to occur more efficiently.

In addition, the higher thermal conductivity of crystalline polymers is also due to the higher density of the crystalline regions, which allows for the polymer chains to be in closer contact and vibrate more effectively. The ordered structure of the crystalline regions also increases the surface area that is exposed to thermal energy, which further contributes to the higher thermal conductivity.

Overall, polymeric materials with high crystallinity typically display greater thermal conductivity compared to non-crystalline polymers due to the more effective coordinated vibration of the chains within the crystalline regions.

The ordered structure of the crystalline regions allows for increased number of contacts between the polymer chains, increased density of the crystalline regions, and increased surface area exposed to thermal energy, which all contribute to the higher thermal conductivity of crystalline polymers.

To know more about polymers, click below:

https://brainly.com/question/24521737

#SPJ4

Answer:

33.4814814815

Explanation:

90.4/2.70

Correct question is;

Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is?

Answer:

6%

Explanation:

From ohms law, we know that;

R = V/I

Where;

R is resistance

V is voltage

I is current

Now, the percentage error in the resistance is given by the formula;

ΔR/R = ΔV/V+ ΔI/I

We are told that the current and the voltage difference have a percentage error of 3% each. Thus;

ΔR/R = 3% + 3% = 6%