A 5.00 g sample of hydrated sodium tetraborate, Na2B4O7 x nH2O is heated to drive off the water. After heating, 2.64 g of anhydrous Na2B4O7 reasons. What is the value of "n" in the hydrate formula

A monosaccharide that consists of 5 carbon atoms, one of which is in a ketone group, is classified as a(n) ketopentose.

Ketone family

The suffix "-one" is added after locating the carbonyl group and, if necessary, designating it with a location number. Ketones are given their common names by first identifying the alkyl groups linked to the carbonyl (in alphabetical order), followed by the prefix "ketone." Several Regular Ketones. The three most significant ketones in terms of scale are acetone, methyl ethyl ketone, and cyclohexanone. Though less frequently than in general organic chemistry, they are still widespread in biochemistry. The simplest ketone is dimethyl ketone, or CH3COCH3, often known as acetone.

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2mol of Hydrogen peroxide releases 196.6KJ heat

1mol releases

5mol releases

Answer: 491.5

Explanation:

Hope this helps :)

Explanation:

According to orbital hybridization theory, in ethene the C atoms are using sp2 hybrid orbitals. This leaves one unhybridized p orbital available to form the second bond (Pi bond) in the C-C double bonds.

One sp2 hybrid orbital from each C atom overlap to form one sigma bond between the two carbon atoms. One p orbital from each C atom then overlap to form a pi bond that completes the C-C double bond. The H atoms are bonded via sigma bonds to the C atoms when the H s orbitals overlap with the remaining sp2 hybrid orbitals from each C.

Liquid acetaminophen for children is labeled 180 mg 3 ml. The strength expressed as grams per ml is 0.060.

Acetaminophen is a medicine that is used to treat all kind of pains. Headache, menstrual pain, stomach ache, etc. It also used to reduce fever and cold/cough.

Liquid acetaminophen for children is labeled as 180 mg/ 3ml

The 180 mg will be divided by 3 ml

180 mg/ 3ml = 60 mg/ml

The amount will be multiplied by 1 /1000 to get the quantity equal.

60 mg/ml x 1g / 1000 g

60 x 1/ 1000 mg/ml = 0.060

Thus, the strength expressed as grams per ml is 0.060.

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the greatest amount of work is required if the process is adiabatic.The correct option is adiabatic.

The process in  which heat is constant is called adiabatic process.

The The process in  which temperature is constant is called isothermal process.

The process in  which pressure is constant is called isobaric process.

The P-V diagram for adiabatic , isothermal and isobaric process is given below.

Work done in process = area encloses by P-V diagram axis . Since area under the curve is maximum for adiabatic process which is shown in the above diagram. So, work done by the gas will be maximum for adiabatic process.

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The process of evaporation by which liquid water changes to vapor is shown by a chemical formulae as follows:

Three separation methods that can be used to reverse a physical change include:

Evaporation is the process by which liquids changes to vapor or gas spontaneously.

The rate of evaporation of a liquid increases with increase in temperature of the liquid. The rate of evaporation also increases with increase in surface area of the liquid exposed as well as with increase in wind speed.

The process by which liquid water changes to vapor can be represented by chemical formulae as follows:

H₂O (l) → H₂O (g)

In the equation above, the liquid phase of water, l, is undergoing change to gaseous phase, g.

b. Separation techniques are techniques which are used to separate mixtures of substances.

Three separation methods that can be used to reverse a physical change include:

In conclusion, physical changes are those changes that are easily reversible and which no new products are formed.

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Hydroplaning occurs when water between the tires and the road builds until the tires begin to ride on a film of water, resulting in traction loss.

The motor vehicles or aircraft tires passing over wet pavement may lose contact with sufficient speed or water depth for a particular given tread design. The tires lose the braking friction required for stopping and start to hydroplane or aquaplane when they come into contact with water. Wet road surfaces can cause tires to hydroplane . This could result in loss of control and steering ability.

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12.28 L volume at 6.98atm in sample gas occupies 10. 28 l at 8. 34atm. Hence, option A is correct.

Ideal gas is a hypothetical gas whose molecules occupy negligible space and have no interactions, and which consequently obeys the gas laws exactly.

In the limit of low pressures and high temperatures, where the molecules of the gas move almost independently of one another, all gases obey an equation of state known as the ideal gas law:

PV = nRT,

When Temperature is constant so, it follow Boyle's law:

P1 V1 = P2 V2

P1 = 8.34atm, V1 = 10.28 L, P2 = 6.98atm

V2 = P1 V1 / P2

V2 = 8.34atm x 10.28 / 6.98atm

V2 = 12.28 L

12.28 L volume at 6.98atm in sample gas occupies 10. 28 l at 8. 34atm. Hence, option A is correct.

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There are 0. 650 moles of sodium bromide can be produced from the reaction of 1. 03 moles of bromine gas with 0. 650 moles of sodium .

Calculation ,

To find the number of moles of sodium bromide we have to write balanced chemical equation first .

[tex]2Na (s)+ Br_{2}(g)[/tex] → 2NaBr (s)

from the equation we can conclude that 2 moles sodium react with one mole of bromine to form 2 mole of sodium bromide .

But  1. 03 moles of bromine gas ( that is equal to the number of moles required in the equation) with 0. 650 moles of sodium ( that is half of required mole ) is given .

So, sodium is present as limiting reactant .

So , the number of sodium bromide formed is equal to the number of moles of sodium atom.

Hence ,  the number of sodium bromide formed =  0. 650 moles

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Answer:

Al₂O₃ + 6 NaOH -----> 2 Al(OH)₃ + 3 Na₂O

Explanation:

This is a double-displacement reaction. In these reactions, the cation of one compound is swapped with the cation of another.

It is important that the new products have an overall charge of 0. To do this, some compounds must have more than 1 atom of each ion.

1.) Al(OH)₃

-----> Al³⁺ and OH⁻

-----> +3 + (-1) + (-1) + (-1) = 0

2.) Na₂O

-----> Na⁺ and O²⁻

-----> +1 + 1 + (-2) = 0

An equation is balanced when there is an equal amount of each element on both sides of the reaction. If these values are unequal, you can add coefficients to modify the amounts of particular compounds.

The unbalanced equation:

Al₂O₃ + NaOH -----> Al(OH)₃ + Na₂O

Reactants: 2 aluminum, 4 oxygen, 1 sodium, 1 hydrogen

Products: 1 aluminum, 4 oxygen, 2 sodium, 3 hydrogen

The balanced equation:

Al₂O₃ + 6 NaOH -----> 2 Al(OH)₃ + 3 Na₂O

Reactants: 2 aluminum, 9 oxygen, 6 sodium, 6 hydrogen

Products: 2 aluminum, 9 oxygen, 6 sodium, 6 hydrogen

Each gas dissolved in the blood diffuses between the blood and its surroundings based on differences in the partial pressure and diffusion occurs until equilibrium is reached.

The gas exchange refers to the process by which oxygen is absorbed by red blood cells and carbon dioxide is removed through the respiratory system.

The process of gas exchange is carried out due to the differential diffusion rates of gases in the bloodstream (O2 and CO2), which facilitates the transference of these gases.

In conclusion, each gas dissolved in the blood diffuses between the blood and its surroundings based on differences in the partial pressure and diffusion occurs until equilibrium is reached.

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England topped what torturous temp for the first time of 40°C

For the first time ever, Britain experienced temperatures on Tuesday of over 40 degrees Celsius, or 104 degrees Fahrenheit, as a fierce heat wave moved northwest, causing raging wildfires, fatalities, and forced home evacuations throughout a Europe that was terrifyingly unprepared to deal with the new reality of extreme weather.

A heat wave is a period of very hot weather that may also be accompanied by significant humidity, especially in nations with maritime climates. While there are several definitions, a heat wave is typically assessed in relation to the local climate and the average temperatures for the time of year.

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Styrene is an organic chemical used to make rubber, latex, resins, etc. It can be best converted using the anti-Markovnikov rule by (1) BH₃ - THF and (2) H₂O₂, NaOH. Thus, option B is correct.

The anti-Markovnikov rule defines the attachment of the substituent group to the least substituted carbon than the more substituted groups. This is due to the induction and hyperconjugation effect.

To convert styrene, the alcohol group from sodium hydroxide must be added to the least substituted carbon of the compound using other reagents like BH₃ - THF and hydrogen peroxide.

Therefore, option B. (1) BH₃ - THF and (2) H₂O₂, NaOH can be used to convert styrene.

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Your question is incomplete, but most probably your full question was, What is the best method to convert styrene, C₆H₅CH=CH₂, to 2-phenyl ethanol with minimal side product formation?

3rd statement about this acidic reaction is not true

In acidic reactions,  Litmus paper is available in red and blue varieties and is typically more trustworthy. To determine whether a solution is normal or acidic, use litmus paper. The acid or basic strength is not precisely outlined in Litmus's paper. Thus, Base causes red litmus to turn blue.

The pH scale has numbers 0 through 14. Seven is the neutral pH. Over 7 is a base, and anything below 7 is acidic.

H+ ions are present in all acidic reactions. As a result, whether mineral or organic, all acid solutions transmit electricity. They allow an electric current to flow through them.

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Answer:

The reactivity series allows us to predict correctly how metals will react. Another importance is that so we can use displacement. We can spot a more reactive metal allowing us to displace a less reactive metal from a compound or an equation.

Hope this helped! Marking me brainliest will be very helpful!

Please comment below if you require more assistance from me! :)

Importance of Metal Reactivity Series are:

What are metal reactivity series?

Metal reactivity series is a chart of listing the metals in the order of decreasing reactivity.

See the below reaction:

K(s)        +            [tex]H_2O[/tex]   →           KOH(aq)              +                  1/2 [tex]H_2[/tex] (g)

Potassium      water              Potassium Hydroxide                Hydrogen

Lets see the reaction between Lead with Hydrochloric acid and Sulphuric acid.

Pb (s)      + 2HCl (aq)           →              [tex]PbCl_2[/tex] (aq)           +       [tex]H_2[/tex] (g)

Lead        Hydrochloric acid          Lead chloride                  Hydrogen

Pb (s)      +   [tex]2H_2SO_4[/tex]             →     [tex]PbSO_4[/tex]              +   [tex]SO_2[/tex]                   +   [tex]H_2O[/tex]

Lead         Sulphuric acid            Lead Sulphate      Sulphur dioxide    water

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The pH after 10. 0 ml of 0. 40 M NaOH is added to 20. 0 ml of 0. 50 M HCl is 13.3 .

Calculation ,

[ [tex]OH^{-}[/tex] ] = [tex]M_{1} V_{1} -M_{2} V_{2} /V_{1} +V_{2}[/tex]

where M is molarity and V is the volume .

[ [tex]OH^{-}[/tex] ] = 0. 50 M × 20. 0 ml - 0. 40 M × 10. 0 ml / 10. 0 ml +20. 0 ml

[ [tex]OH^{-}[/tex] ] = 6/30 = 0.2

pOH = -㏒[ [tex]OH^{-}[/tex] ]  =  -㏒ 0.2 = 0.7

pH = 14 - pOH =  14 - 0.7 = 13.3

Therefore , the pH after 10. 0 ml of 0. 40 M NaOH is added to 20. 0 ml of 0. 50 M HCl is 13.3 .

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The primary sources of acidity in acid rain are the gases SO[tex]_{2}[/tex] and NO[tex]_{x}[/tex] So, the correct option is (c) SO[tex]_{2}[/tex] and NO[tex]_{x}[/tex]

A chemical process that starts when gases like sulphur dioxide and nitrogen oxides are discharged into the atmosphere leads to acid rain. These substances have the ability to ascend very far into the sky, where they combine and react with oxygen, water, and other chemicals to produce acid rain, an additional form of acidic pollution.

Acidic particles corrode metal and hasten the deterioration of paint and stone. Power plants are the primary sources of SO[tex]_{2}[/tex] . Burning fossil fuels produces nitrogen dioxide (like gasoline). Cars, lorries, and power plants are the biggest producers of NO[tex]_{2}[/tex].

Therefore, The primary sources of the acidity in acid rain are the gases SO[tex]_{2}[/tex] and NO[tex]_{x}[/tex].So, the correct option is (c) SO[tex]_{2}[/tex] and NO[tex]_{x}[/tex]

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An endothermic reaction is favored by raising the temperature of a system in dynamic equilibrium. The mechanism absorbs the increased heat to offset the alteration you made. An exothermic reaction is favored by a system's temperature falling while it is in dynamic equilibrium.

Any chemical process that takes heat from its surroundings is said to be endothermic. The reaction's activation energy comes from the energy that was absorbed. This kind of reaction is characterized by its icy sensation.

An exothermic reaction is one in which energy is given off as heat or light. In contrast to an endothermic process, which draws energy from its surroundings, an exothermic reaction transfers energy into the environment.

Materials like hydrocarbons reacting with oxygen to produce combustion products like water and carbon dioxide is an example of an exothermic process.

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The conductivity of the solution in a reaction can be used to measure rates of reactions involving aqueous electrolytes. The correct option is D.

Conductivity is a property that tells if a material can pass heat and light through it. Conductor are hose material that pass the heat and plight through it. Those material that do not transfer the heat are called non-conductor.

The conductivity of a solution in a reaction. To measure the change in the rates of a solution that involve the aqueous electrolyte, the conductivity of the solution is measured.

Thus, the correct option is D. aqueous electrolytes.

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The question is incomplete. Your complete question is given below:

These are the options:

Gaseous substances

brightly colored substances

organic compounds

aqueous electrolytes

Answer:

80 m/hr

Explanation:

Changes from 20 to 100 meters in ONE Hour

    changes  80 meters in one hour    = 80 m/hr

The statement that the concentration of carbon will not change if gaseous water is added to the system is false. The concentration of carbon will increase.

Concentration of a substance is the present of a substance in a per-unit square of an area. It is the total amount of solute present in the solution.

The equilibrium is C(s) + H₂O(g) < - > CO(g) + H₂(g), ΔH = 2296 J.

If we increase or add the gaseous water in the system, the amount of carbon will increase because the carbon is a gas, and increasing the pressure will increase the volume of the gas, at Constant temperature.

Thus, the statement is false.

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Sucrose, a disaccharide (consisting of two monosaccharides), is table sugar.

A digestive enzyme called sucrase catalyses the breakdown of sucrose into its component sugars, fructose and glucose. One type, sucrase-isomaltase, is secreted at the brush boundary of the small intestine. Invertase, a form of the sucrase enzyme that is more frequently found in plants, also hydrolyzes sucrose but does it in a different way.

Maltose is converted to glucose by maltase. Succrase and lactase, respectively, break down other disaccharides like sucrose and lactose. Sucrase and lactase are enzymes that break down sucrose (also known as "table sugar") and lactose (sometimes known as "milk sugar"), respectively, into glucose and fructose.

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Answer:

Explanation:

B

Alkali metals nitrates on heating give the corresponding nitrogen dioxide and oxygen.

These are the metals which forms alkali when dissolved in water. They are any of the soft, light, reactive metals of Group 1 of the periodic table.

Some examples of alkali metals are as follows:

A periodic table is a tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same column.

So therefore, alkali metals nitrates on heating give the corresponding nitrogen dioxide and oxygen.

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If the freezing point depression for a solution is 2.5°c and kf = 4.5°c/m, the molality of the solution is

m= 0.56m

While molecular weight (MW) and molecular weight (MW) may be used to measure concentration, molecular weight (MW) and molecular weight (MW) is used to measure molecular weight and concentration, respectively.

Generally, the equation for  of freezing point of depression with molality is  mathematically given as

[tex]\Delta T_{f} = k_{f} *m[/tex]

Therefore

m = 2.5/4.5

m= 0.56m

In conclusion,  the molality of the solution  is 0.56m

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Answer:

I think it involves the use of extractive distillation but I'm not sure.

Still hope it helps:-)

The physical property is used to separate cyclohexanone from any unreacted cyclohexanol is distillation.

The process for separating cyclohexanone from cyclohexanol comprises the following steps

1. reacting a mixture of ketone and alcohol with an organometallic compound M(X)n to form compound HX, wherein M is chosen from aluminium, titanium and boron, where n is the valance of a M, X denotes equal or different organic group chosen from alkyl group and electric group having up to 10 carbon atom

2. liberating the newly formed compound HS from the reaction mixture by distillation

3. separating the ketone from the organometallic compound formed by reaction between M(X)n and the alcohol in the mixture.

Thus, we concluded that above compound is seprated by forming organometallic compound.

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The "break-even" interest rate for year n that equates the return on an n-period zero-coupon bond to that of an n - 1 - period zero-coupon bond rolled over into a one-year bond in year n is defined as the forward rate.

A forward rate is a specified price agreed by all parties involved for the delivery of a good at a specific date in the future. The use of forward rates can be speculative if a buyer believes the future price of a good will be greater than the current forward rate. Alternatively, sellers use forward rates to mitigate the risk that the future price of a good materially decreases.

Regardless of the prevailing spot rate at the time the forward rate meets maturity, the agreed-upon contract is executed at the forward rate. For example, on January 1st, the spot rate of a case of iceberg lettuce is $50. The restaurant and the farmer agree to the delivery of 100 cases of iceberg lettuce on July 1st at a forward rate of $55 per case. On July 1st, even if the price per case has decreased to $45/case or increased to $65/case, the contract will proceed at $55/case.

To extract the forward rate, we need the zero-coupon yield curve.

We are trying to find the future interest rate [tex]{\displaystyle r_{1,2}}{\displaystyle r_{1,2}}[/tex]  for time period  

[tex]{\displaystyle (t_{1},t_{2})}(t_1, t_2), {\displaystyle t_{1}}t_{1}[/tex]  and  [tex]{\displaystyle t_{2}}t_{2}[/tex]  expressed in years, given the rate  [tex]{\displaystyle r_{1}}r_{1}[/tex]  for

time period  [tex]{\displaystyle (0,t_{1})}(0, t_1)[/tex]  and rate [tex]{\displaystyle r_{2}}r_{2}[/tex]  for time period [tex]{\displaystyle (0,t_{2})}(0, t_2)[/tex].  To do this, we use the property that the proceeds from investing at rate  [tex]{\displaystyle r_{1}}r_{1}[/tex] for

time period [tex]{\displaystyle (0,t_{1})}(0, t_1)[/tex]  and then reinvesting those proceeds at rate

[tex]{\displaystyle r_{1,2}}{\displaystyle r_{1,2}}[/tex]  for time period  [tex]{\displaystyle (t_{1},t_{2})}(t_1, t_2)[/tex]  is equal to the proceeds from

investing at rate [tex]{\displaystyle r_{2}}r_{2}[/tex] for time period [tex]{\displaystyle (0,t_{2})}(0, t_2)[/tex].

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A molecular size affects the rate of evaporation when the larger the intermolecular forces in a compound, the slower the evaporation rate and this correlates with temperature change.

Molecular size seems to have an effect on evaporation rates in that the larger a molecule gets or grows from a base chemical formula, its evaporation rate will get slower.

This is a measure of the area a molecule occupies in three-dimensional space as this relates to the physical size of an individual molecule.

Hence, we can see that a molecular size affects the rate of evaporation the larger the forces, the lower the rate.

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pH of the solution after 24. 00 ml of the hcl has been added is 12.87

millimoles NaOH = mL x M = 24.00 mL x 0.25 M = 6.00

millimoles HCl = 24.00 mL x 0.10 M = 2.40

total volume = 48.00 mL

.................................NaOH + HCl ==>NaCl + H2O

initial.........................6.00.........0............0.........0

added.....................................2.40............................

change.................... -2.40......-2.40.........+2.40.... +2.40

equilibrium.................3.60.........0..............2.40.......2.40

The NaCl contributes nothing to the pH of the final solution. The pH is determined by the excess of NaOH present. (NaOH) = millimoles/mL = 3.60/48.00 = 0.075 M = (OH^-)

pOH = -log (OH^-). Then

pOH = -log (0.075)

pOH =1.1249

As we know,

pH + pOH = pKw = 14.00

pH=14-pOH

pH=14-1.1249

pH=12.87

pH is a logarithmic measure of an aqueous solution's hydrogen ion concentration. pH = -log[H+], where log is the base 10 logarithm and [H+] is the concentration of hydrogen ions in moles per liter.

The pH of an aqueous solution describes how acidic or basic it is, with a pH less than 7 being acidic and a pH greater than 7 being basic. A pH of 7 is regarded as neutral (e.g., pure water). pH values typically range from 0 to 14, though very strong acids may have a negative pH and very strong bases may have a pH greater than 14.

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