Aldehydes and ketones undergo acid-catalyzed reaction with alcohols to yield hemacetals, compounds that have one alcohol-like oxygen and one ether-like oxygen bonded to the same carbon. Further reaction of a hemiacetal with alcohol then yields an acetal, a compound that has two ether-like oxygens bonded to the same carbon. Show the structure of the acetal that you would obtain by reaction of acetophenone with 2-propanol • You do not have to consider stereochemistry, • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer.

1. Salt is used as a flavor enhancer in food and also plays a role in food preservation.

2. Salt is used as a source of ions in chemical reactions and in the production of certain chemicals such as chlorine and sodium hydroxide.

3. Salt is used in the process of water softening to remove hard water minerals such as calcium and magnesium.

4. Salt is used in the production of certain metals such as aluminum, which is produced by electrolysis of a molten mixture of aluminum oxide and cryolite (Na3AlF6).

5. Salt is used in the production of fertilizers, which often contain various forms of nitrogen, phosphorus, and potassium that are derived from compounds containing these elements, such as potassium chloride.

The freezing point of the solution is -3.53°C.

The Chemical equation of the HBr is -

              HBr → H⁺ + Br ⁻

Initial -     1         0      0

Final -      1-α     α       α

The total moles = 1 - α + α + α

                          = 1 + α

half factor = i = Total mol / Initial mol

                      = 1 + α / 1

                      = 1 + α

Now, Evolution in freezing point

                         ΔT f = i Kf m

                          kf = 1.86                                                (given)

   m(molality = mass of solute / solvent (Kg))

                        Δ T f  = (1 + α) × 1.86 × (mass/molar mass ) / solvent

   [ α = 90/100 = 0.9 because 90% ionised]

  putting the values in above equation -

                           = (1 + 0.9) × 1.86 × (8.1 × 1000) / 81 × 100(gm)

                              ΔT = 3.53°C

    Then freezing point T f =  T° f - ΔT

                            = 0 - 3.53°C

                           T f = -3.53°C

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Complete Question -

What is the freezing point of a solution containing 8.1 g HBr in 100gm. water assuming the acid to be 90% ionised:

[Kf for water =1.86Kmolarity^−1 ]

A wastewater sample that is known to contain high amounts of acetic acid can be utilised to determine the carbon dioxide content using the titration process.

Water and some of the CO2 that is dissolved in it react to create carbonic acid (H2CO3). The pH of the water decreases as a result of the hydrogen ions in carbonic acid. Therefore, when the blood's carbon dioxide concentration increases, more H+ ions and a lower pH are created. Numerous titrations are required to boil the solution due to the CO2 that is created during the acid-base interaction. Carbonic acid (H2CO3) is created when carbon dioxide is dissolved in water; this acid acts as a buffer and reduces the accuracy of data.

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Answer:

A

Explanation:

A chemical change started immediately and finished at eight minutes

Answer:

The answer is

A.) A chemical change started immediately and finished

at eight minutes.

Explanation:

Answer:

4. The question needs to focus more on a relationship instead of just numbers.

Explanation:

One of the characteristic of a good research questions that the answer to that question should be able to be used to make a certain decision. Without this, the question would be considered as useless.

The answer to the question "How many alligators live in the Everglades National Park?"  will not provide you with any useful information. Only non-useful fact. We need to make a little adjustment to make the answer becomes useful.

For example,  Let's say that we alter the question to;

"How littering contribute to the number of Alligators that live in the Everglades National Park?'

The answer to that question will provide us with something that we can use to make a decision. Let's say we find out that littering lead to decreasing number of alligators. We can use this data to convince the legislators to increase the budget to clean up the national park.

Explanation:

What is the best method for separating food dyes

Answer:

The oceans obtained freshwater from glaciers melting. The freshwater was then trapped into small places below waves, which could be a reason why there is not much freshwater in the world.

120.3 g of benzene is required to produce 109.5 grams of maleic acid anhydride.

The reaction equation is;

2 C₆H₆(l) + 9 O₂(g) → 2 C₄H₂O₃(s) + 4 CO₂(g) + 4 H₂O(g)

Actual yield of   maleic anhydride = 109.5 g

Theoretical yield = 100 × Actual yield/% yield

Theoretical yield =  100 ×  109.5/72.6

Theoretical yield  = 150.8 g

Number of moles of maleic anhydride = mass/molar mass = 150.8 g/98.06 g/mol = 1.54 moles

From the reaction equation;

2 moles of benzene yields 2 moles of maleic anhydride

1.54 moles of benzene yields 1.54 moles of maleic anhydride

Mass of benzene required = 1.54 moles × 78.11 g/mol

Mass of benzene required = 120.3 g of benzene.

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Answer:

Forces acting on an object may be balanced or unbalanced. When the forces  acting on an object have equal strength and act in opposite directions, they  are balanced. These forces cancel out one another, and the motion of the  object does not change.  When the forces acting on an object are unbalanced, they do not cancel out  one another. An unbalanced force acting on an object results in the object’s  motion changing. The object may change its speed (speed up or slow down), or it may change its direction.  Friction is a force that resists the motion or the tendency toward motion  between two objects in contact with each other.  Gravity is a force that pulls objects toward one another. For example, Earth  pulls all objects toward it.

Explanation:

See the attached image.

"N-O bond as well as a double bond. The N atom possesses a positive charge and an unpaired electron. They are the two principal resonance sources of NO2.

How many bond groups does NO2 exist?

Each of the oxygen atoms has an octet of electrons. There are two sigma bonds and one lone electron pair in nitrogen dioxide (NO2).

How are resonance structures discovered?

Count the atom's own electrons and compare that number to its electron pairs to determine the formal charges. For instance, the oxygen just at top has five electrons. Three of the electrons come from bonds, whereas the other two are lone pairs.

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Answer:

Explanation:

d:coal!

hope i helped :)))

Answer:

Zebra- consumer

Tiger- consumer

Worm- decomposer

Tree-Producer

Molded bread- decomposer

Plant- producer

Answer:

Explanation:

Dandelion plant produces light and feathery seeds .

Zebra consumes / eats grass so it is a consumer .

The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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When we bring a magnet near the doorbell when it is not connected to the battery, we feel a pull, or an attractive force.

For this the hypothesis can be:

Hypothesis: If there is no permanent magnet in the doorbell, just metal like iron, then when we bring a paper clip to the doorbell, we will observe an attractive force between the paper clip and the doorbell due to the interaction between the magnet and the iron in the doorbell.

Hypothesis: If there is a permanent magnet in the doorbell, then when we bring a paper clip to the doorbell, we will observe a stronger attractive force between the paper clip and the doorbell due to the interaction between the magnet and the metal components (such as iron) in the doorbell.

Thus, these can be the Hypothesis for the given scenario.

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Answer:

A concentrated acid is an acid which is in either pure form or has a high concentration. Laboratory type sulfuric acid (about 98% by weight) is a concentrated (and strong) acid. A dilute acid is that in which the concentration of the water mixed in the acid is higher than the concentration of the acid itself.

Explanation:

Concentrated acid - Those acids which are pure or have very high concentration in water are called as concentrated acids. For example concentrated Hydrochloric acid (HCl) and concentrated Sulphuric acid are examples of concentrated acids.

Total heat generated by 2 mole of TiO2(s) is 4.963kJ.

The amount of heat released in the reaction of 2.89 mol of TiO2(s) can be calculated using the following equation: q = nCΔT, where n is the number of moles, C is the specific heat capacity of TiO2, and ΔT is the change in temperature.

The specific heat capacity of TiO2 is 683. 697. J/kgK. and the change in temperature is is 25k. By plugging in the values and converting J to kJ,

q = 2.89 * 25 * 683.697

=> 4963.35

In brief, the amount of heat released by 2.89 mol of TiO2(s) is 4.963kJ.

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Complete question :

determine how much heat (in kj) of 2.89 mol of tio2(s) with a temperature difference of 25k

At standard temperature and pressure (STP), one mole of a gas occupies a volume of 22.4 liters is 0.22 Liters.

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Answer: 255 pm

Explanation: Hope this helps!

Answer:

wat dose dis du

Explanation:

u to frend lit me now if yu need help with yur math and english homewirk. me got anser 2 evryting

In a chemical equation, the formula of a substance in water solution is followed by the symbol (aq).

A chemical equation is a symbolic representation of a chemical reaction that shows the reactants, products, and direction of the reaction. It utilizes chemical symbols and formulas to illustrate the reactants and products of the reaction and helps to identify the amount of each substance involved in the reaction. Chemical equations are important tools for tracking the progress of a reaction and for predicting the products of a reaction. They also help scientists and students to visualize the changes occurring in a reaction.

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The number of moles we need of ZnO to be produced from the 5 moles of Zn is 5 moles.

In the International System of Units, the mole is the unit of substance quantity. The amount of substance is a measurement of how many elementary entities of a certain substance are present in an object or sample. The mole is defined as having 6.02214076 x 10²³ basic entities.

Step 1: Data given

Number of moles ZnO produced = 6.0 moles

Step 2: The balanced equation

2Zn + O2 → 2ZnO

For 2 moles Zinc we need 1 mol Oxygen to produce 2 moles Zinc oxide

Step 3: Calculate moles zinc

For 2 moles Zn we need 1 mol O2 to produce 2 moles ZnO

For 5.0 moles ZnO produced, we need 5.0 moles of zinc (Zn) and 2.5 moles of O2 to react.

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The name of the organic compound is 2-methyl pentane. The given organic compound is a five-carbon system with a substitution at the C-2 carbon. The naming of an organic compound is done according to the rules given by IUPAC.

The given organic compound has 5 carbon in its main chain. So It has the root word Pent. Since, all the bonds are single bonds, the organic compound is saturated, hence it has the suffix -ane. Hence the unsubstituted straight chain is pentane.

Numbering is done from right to left, because when the numbering is from right to left, the substituted carbon gets C-2, when it is numbered from left to right, the substituted carbon gets C-4. So the numbering is from the right and the substituted carbon is C-2. The substituent is a single carbon system, a methyl substituent. So the organic compound is named 2-methyl pentane .

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The value of kw at 52°C is 8.3×10^-12.  The van't Hoff equation relates the change in equilibrium constant to the change in temperature.

ln(K2/K1) = -(ΔH°/R)[(1/T2) - (1/T1)]

where K1 and K2 are the equilibrium constants at temperatures T1 and T2, respectively, ΔH° is the standard enthalpy change, and R is the gas constant.

In this case, we want to find kw at 52°C, so we need to use the van't Hoff equation to calculate the equilibrium constant at 25°C and 52°C, and then use the equation kw = [H3O+][OH-] to find kw at 52°C.

First, let's calculate the equilibrium constant at 25°C (298 K) using the known value of kw:

kw = [H3O+][OH-] = 1.0×10^-14

[H3O+] = [OH-] = sqrt(kw) = 1.0×10^-7 M

The equilibrium constant expression for the auto-ionization of water is:

K = [H3O+][OH-]/[H2O]^2

At 25°C, we can assume that the concentration of water is 55.6 M (the density of water is 1 g/mL, and the molar mass of water is 18 g/mol), so:

K1 = (1.0×10^-7)^2/(55.6)^2 = 1.8×10^-16

Now we can use the van't Hoff equation to find the equilibrium constant at 52°C (325 K):

ln(K2/K1) = -(ΔH°/R)[(1/T2) - (1/T1)]

ln(K2/1.8×10^-16) = -(5.58×10^4 J/mol)/(8.314 J/(mol·K))[1/325 K - 1/298 K]

ln(K2/1.8×10^-16) = 17.49

K2/1.8×10^-16 = e^17.49

K2 = 2.6×10^-1

Finally, we can use the equilibrium constant to calculate kw at 52°C:

kw = [H3O+][OH-] = K[H2O]^2

kw = (2.6×10^-1)(55.6)^2

kw = 8.3×10^-12

Therefore, the value of kw at 52°C is 8.3×10^-12.

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Answer

D

Explanation:

They take up usable forms of nitrogen found in soil

Answer:

d

Explanation:

i took the test

In the ionic compound NaCl, the sodium ion is the cation. you observe in the first word in the names for the other ionic compounds is Cation.

1) NaCl , sodium chloride is ionic compound = Na⁺   Cl⁻

2) CdS, cadmium sulfide is ionic compound = Cd²⁺   S²⁻

3) CaI₂, calcium iodine is ionic compound = Ca²⁺     I⁻

4)  LiCl , lithium  chloride is ionic compound = Li⁺    Cl⁻

5) Na₂O, sodium oxide is ionic compound = Na⁺   O²⁻

6) BaF₂, barium fluoride is an ionic compound = Ba²⁺   F⁻

7) Mg₃N₂, magnesium nitride is an ionic compound = Mg²⁺    N³⁻

Thus, In the ionic compound NaCl, the sodium ion is the cation. you observe in the first word in the names for the other ionic compounds is Cation.

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Answer: one way is that the atom will share an electron. Sorry i only know 1 way

Explanation: for example, if Cl with 7 electrons wants to bond with Ar, that has a conplete set of 8 electrons, then Ar will share its electron to fill in the space of the missing electron in Cl.

*JUST AN EXAMPLE. IM NOT SAYING CL AND AR DO FORM A BOND.

Answer:

ionic bonds and convalent bond

Explanation:

by taking the electrons it means convalent bond

but if you're borrowing the electrons it mean ionic bond

The word "substitution," represented by the letter S in the chemical formula SN2, denotes that one functional group is being replaced by another in the reaction. The letter N stands for "nucleophilic," suggesting that a nucleophile is attacking an electrophilic carbon atom in the process.

The nucleophile and the substrate are two of the species involved in the reaction's rate-determining phase, as shown by the two in SN2. In this instance, the reaction rate exhibits second-order kinetics, which states that it is proportional to the concentrations of the nucleophile and substrate.

Because the SN2 reaction is a bimolecular process, the rate of the reaction is inversely correlated with the concentrations of the nucleophile and substrate. Rate = k[Nu][R-X], where [Nu] is the concentration of the nucleophile and [R-X] is the concentration of the substrate, is the rate equation for the reaction.

The SN2 reaction mechanism, which is used in numerous synthetic processes, is a significant reaction in organic chemistry. It is frequently favored by primary alkyl halides, which have a carbon center that is largely unobstructed, and by potent nucleophiles that may effectively attack the carbon center.

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Answer:

Cassiterite is an ore of Sn.It is also called tinstone and has molecular formula of SnO

2 . It is heavy, metallic, hard tin dioxide that is the major ore of tin. It is colourless when pure, but brown or black when iron impurities are present.

Answer:

The electric force between them decreases

Explanation:

The force between two charged particle is given by :

\(F=\dfrac{kq_1q_2}{r^2}\)

Where

r is the distance between charges

If the distance between the charges is increased, the electric force gets decreased as there is an inverse relation between force and distance.

Hence, the correct option is (c) "The electric force between them decreases"