what is the concentration of ammonia ( n h 3 ) in solution if 24.60 ml of 0.1080 m hcl is needed to titrate a 250 ml sample of the ammonia solution to the end point?

The number of moles of aluminum that neutralizes the antacid is 7.95 moles.

An antacid is a substance that neutralizes the acidity in our stomach. Antacid contains substances like aluminum, magnesium and etc. It makes the pH alkaline when the pH drops below the required amount.

    According to the given condition, aluminum hydroxide reacts with hydrochloric acid.

Al(OH)3 + 3Hcl - Alcl3 + 3 H2O.

      Here, 1 mole of aluminum hydroxide reacts with 3 moles of hydrochloric acid.

Therefore, 2.65g will react with 3/1 moles.

Therefore, 3/1 x 2.65 = 7.95 moles.

Complete question: -

Some antacid tablets contain aluminum hydroxide. The aluminum hydroxide reacts with stomach acid according to the equation: AI(OH)3 +3HCIAICI, +3H2O. Determine the moles of acid neutralized if a tablet contains 0.200 mol of Al(OH)3

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Polar aprotic solvents are those solvents which have not acidic proton and polar nature.

Polar aprotic solvents are used in SN1 mechanism because these solvated both carbocation and anion .

The SN1 reaction mechanism follows a stepwise process in which the carbocation is first formed by removal of a leaving group. The carbocation is then attacked by a nucleophile. Finally, the protonated nucleophile is deprotonated to yield the desired product.

Thus, polar protic solvents help stabilize both carbocations and anions, and solvation of both cations and anions aids the progression of the SN1 mechanism. Therefore, polar protic solvents favor the SN1 mechanism.

Polar aprotic solvents are solvents that do not have acidic protons and are polar. Such solvents lack hydroxyl and amine groups. Many solvents, including chlorocarbons and hydrocarbons, can be classified as aprotic, but polar aprotic solvents are of particular interest due to their ability to dissolve salts.

examples: Actone , ethyl acetate

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The empirical formula of the compound C₄H₁₀O₁.

The empirical method of a chemical compound is the simplest entire range ratio of atoms present in a compound. The empirical formula of a compound is the most effective whole variety ratio of atoms of each detail in the compound.

Step 1: decide the masses. Step 2: decide the variety of moles by dividing the grams by means of the atomic mass. Step 3: Divide the wide variety of moles of every detail through the smallest quantity of moles. Step 4: Convert numbers to complete numbers.

                                         divide by smallest

64.9% C /12 = 5.4             5.4/ 13.5  = 4

13.5% / 1 H  = 13.5             13.5 /1.35  = 10

21.6% / 16 O  = 1.35          1.5/1.5 = 1

Empherical formula = C₄H₁₀O₁

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The reported amount of antacid in the sample will be too high.

What are antacids?

Antacids are simply assembled salts and salk like compound which help in neutralizing of acids.This Neutralization reaction by antacids leads to various products such as other salts, water and possibly carbondioxid which results in hydrolysis and insoluble compound precipitation. There is a noticeable decline in the neutralizing ability by antacids and neutralization rate of aluminum-containing antacids when they are neutralized ny antacids in the presence of organic acids, peptones, and polypeptides.

In above case, the reported amount of antacid will be high because it will report as more NaOH needed to neutralize a greater amount of HCl.

Hence, The reported amount of antacid will be too high.

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The sample's antacid content will be overstated in the reported amount.

What are antacids?
Simple salts and salk-like compounds that are assembled to form antacids aid in neutralising acids. Antacids' neutralisation reaction produces a number of byproducts, including other salts, water, and possibly carbon dioxide, which causes hydrolysis and the precipitation of insoluble compounds. When aluminum-containing antacids are neutralised by antacids inside the presence of organic acids, peptones, and polypeptides, there is a discernible decline in their ability to neutralise and rate of neutralisation.

In the aforementioned situation, the reported amount of antacid would be high because more NaOH will be required to neutralise a larger amount of HCl.

Hence, The reported amount of antacid will be too high.
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Answer:

25

E

12

Explanation:

As shown in the pic

Mass number = 12 + 13 = 25

Atomic number = No of protons = 12

A piece of wood is measured and 1/4 of its 14c has decayed into 14n.  The half-life of 14c is 5,730 years. Approximately 5,730 years old is it.

The half-life is the time required for a quantity to fall to half of its starting value. The expression is commonly used in nuclear physics to describe how quickly unstable atoms decay radioactively or how long stable atoms remain. The term can also be used more generally to refer to any type of exponential decay.

A measurement of a piece of wood reveals that one-fourth of its 14c has converted to 14n.

With a half-life of 5700 30 years, radiocarbon (14C) is particularly useful for dating in archaeology. The Gamow-Teller ß-decay, an uncommon impediment to the beta decay of 14C to 14N, causes this half-life to be short.

Radiocarbon dating, also referred to as carbon-14 dating, is a method of radiometric dating. It uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of items containing carbon up to a maximum of 58,000–62,000 years. Carbon has two stable, nonradioactive isotopes: carbon-12 and carbon-13. On Earth, trace amounts of the unstable radioactive carbon-14 (14C) are also present. Carbon-14 has an extremely short half-life of 5,730 years due to radioactive decay to nitrogen-14, which means that within this time, the percentage of carbon-14 in a sample will have dropped by 50%. Carbon-14 would vanish from Earth's atmosphere in less than a million years if it weren't for cosmic rays that are continually pelting the stratosphere and interacting with nitrogen molecules (N2) and single nitrogen atoms.

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The pH of buffer solution obtained will be 7.05 by dissolving 29.029.0 g of kh2po4(s)kh2po4(s) and 44.044.0 g of na2hpo4(s)na2hpo4(s) in water and then diluting to 1.00 l.

This can be calculated using use Henderson - Hasselbalch equation:

PH = Pka + ㏒ [A/AH]

Molar mass of KH₂PO₄ =  136.0 g And Molar mass of Na₂HPO₄ =  142.0 g

No. of moles of H₂PO₄⁻ = No. of moles of KH₂PO₄ = (29..0 g) / (136.0 g/mol) = 0.213 mol

No. of moles of HPO₄²⁻ = No. of moles of Na₂HPO₄ = (44.0 g) / (142.0 g/mol) = 0.30 mol

In the solution, [HPO₄²⁻]/[H₂PO₄⁻] = 0.213/0.30

Henderson-Hasselbalch equation:

pH = pKₐ + log([HPO₄²⁻]/[H₂PO₄⁻])

pH = 7.21 + log(0.213/0.30)

pH = 7.05

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Among elements that are involved in a chemical reaction, one that would be most likely to form a cation is : potassium (K)

In the periodic table, potassium is one of the alkali metals which has a single valence electron in the outer electron shell. This valence electron is easily removed to create an ion with a positive charge that is a cation.

Halogens always form anions whereas alkali metals and alkaline earth metals form cations.

Cl- is an example of anion as Cl- atom is a chlorine atom that has gained one electron and has a negative charge of -1 since it has a full outer shell. A negatively charged ion fluorine is an anion.

Nitrogen is neither a cation nor an anion as it falls in the category of atom and atoms are electrically neutral.

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The electronic configuration which have highest second ionization energy will be "1s22s22p63s2".

The energy needed to free the outermost, or lowest bound, an electron from an element's 1+ ion is known as the second ionization energy. The secondary ionization energy of an element would be usually greater than the first since a positive charge greater strongly attracts electrons than a negative charge.

The electronic configuration is 1s22s22p63s2.

It can remove 2 electrons to gain positive charge.

By removing 2 electrons, it attain +2 charge

In mass spectrometry, a variety of ionization techniques are employed. Electron impact (EI) as well as Fast Atom Bombardment are the two traditional techniques that most chemists were familiar with (FAB).

Therefore, the correct answer will be option (ii)

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Answer:

Any of the noble gasses, eg xenon.

Explanation:

All noble gasses have full outer shells of electrons which means they are very unreactive.

The class of Lewis structures known as resonance structures depicts the movement of bonds and lone pairs through various configurations. Resonating structures are produced by the complete transfer of electrons during delocalization from one atom to the following atom. We can infer from this that the distribution of charges is distributed evenly across the molecule, rather than being concentrated at a single location. The electrons are not concentrated around the sigma bond, as shown by resonance structures. The entire molecule now has a high electron charge density. The preferred representation of the molecule is displayed by the resonance structures. The collection of structures suggests that the pi bond's electrons are distributed evenly throughout the molecule and are not concentrated at any one point. Following the octet rule, resonating structures indicate that the atom

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The specific heat of given metal is 3.83 j/g.k

Specific heat, the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius. Units of specific heat are usually calories or joules/grams . Celsius.

Considering:

Heat gain by water = Heat lost by metal

Qₐ = Qₓ

mₐ cₐ (T₂ - T₁) = mₓ cₓ (Tₙ - T₂)

Where, mₐ = 119 g (mass of water)

cₐ = 4.186 j (specific heat of water)

T₂ = 41.0°C (final temperature of water)

T₁ = 21.0°C (initial temperature of water)

mₓ =  200 g (mass of metal)

cₓ = specific heat of metal

Tₙ = 54°C (Initial temperature of metal)

Now, substitute the values in the equation mentioned above,

119 × 4.186 × (41.0 - 21.0) = 200 × cₓ × ( 54 - 41.0)

9962.68 = 2600 cₓ

cₓ = 3.83 j/g.k

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Explanation:

enzymes are biological catalysts that increase the rate of reaction without being used up in the reaction process.

this is done by providing an alternative route to the reaction progress that'll require a lower activation energy.

example - digestive enzyme Amylase, is used to breakdown sugars into glucose for cellular respiration.

hope it helps. :)

Extrapolation method for determining the titration end point is more accurate than finding the minimum conductivity because there is no human error when calculating as there could be with doing the actual experiment

Extrapolation is the estimating an unknown value based on extending a known sequence of values and to extrapolate is the infer something not explicitly stated from existing information and the point at which the indicator changes color is called as endpoint and so the addition of an indicator to the analyte solution help us to visually spot the equivalence point in an acid base titration and the endpoint refer to the point at which the indicator changes color in and acid base titration

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According to the given statement 39.45 g many grams of bromine monochloride must form.

Last but not least, chloride aids in the creation and release if hydrochloric acid (HCl), which is necessary for the appropriate breakdown and absorption of food in the stomach. Chlorine kills pollutants more quickly but does so for a shorter amount of time since it evaporates more quickly. For a longer time, although more slowly, bromine destroys pollutants;

When 27.5 grams of bromine and 12.2 grams of chlorine react, bromine monochloride is produced.

Br2 + Cl2 ---> 2BrCl

mol Br2= 27.5/160g/mol= 0.171mol

mol Cl2= 12.2g/70.906g/mol= 0.172mol

Number of moles of BrCl formed = 2×0.171= 0.342 mol.

mass BrCl= 0.342 mol x 115.357g/mol= 39.45 g

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The percent change in volume is 21 %.

given that :

Temperature T1 = 245 K

temperature T2= 282 K

Pressure P1 = P

pressure P2 = P - 0.05 = 0.95 P

V1 = V

V2 = ?

using the ideal gas equation , we get :

P1 V1 / T1 = P2 T2 / V2

V2 = ( P1 V1 T2 ) ( P2 T1 )

V2 = ( P × V × 282 ) /( 0.95P × 245)

V2 = 1.21 V

change in volume =  V2 - V1 = 1.21 V - V

                                               = 0.21

% change in volume = 0.21 × 100 %

                                 = 21 %

Thus, The percent change in volume is 21 %.

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Explanation:

1. HCI + NaOH --> H₂O + NaCl is a neutralisation reaction. The product is soluble sodium chloride salt and water.

2. _C3H8 + 502 --> 3CO₂ + 4H₂O is a propane combustion reaction. The product is carbon dioxide gas and water.

4. 2Li+F2 --> 2LiF is a combination reaction. The product is insoluble lithium fluoride solid

5.2AgNO3 + CuCl2 --> _Cu(NO3)2 + 2AgCl is a precipitation reaction. The product is copper(II) nitrate and an insoluble silver chloride salt(precipitate)

Sodium metal (Na) has properties with lithium metal (Li) because the two metals are located in the same group, namely group IA.

All elements in group IA are included in the alkali metals, except hydrogen, because the character possessed by hydrogen is "different" and does not match the character of other alkali metals.

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The method can be used to visualize lipids that have been separated by thin-layer chromatography by reversibly reacting with double bonds in fatty acids in iodine fumes.

Chromatography on silica-impregnated paper is a very useful and versatile analytical method. Thin-layer chromatography is considered one of the most effective and versatile techniques for separating intact complex lipids and their lipid moieties as well as neutral lipids.

Solvents play an important role in both pathways as lipids are extracted using solvent-based techniques. In some cases the solvent is incorporated directly into the cell pellet, in others, the solvent is used during cell disruption. The separation and identification of unsaturated fatty acids are commonly performed by bromination or hydroxylation processes that convert unsaturated acids to the corresponding Bromo- or hydroxy-derivatives of saturated fatty acids.

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93.7 grams of copper(ii) oxide are produced when 1.00 kg of the copper ore is processed .

What is combustion ?

Combustion, a chemical reaction between substances, usually containing oxygen, that involves the production of heat and light, usually in the form of a flame. The speed or rate at which reactants combine is partly due to the nature of the chemical reaction itself, and partly due to the more energy produced than can escape to the surrounding medium, the temperature of the reactants is used to rise. further accelerate the reaction.

A well-known example of a combustion reaction is a lit match. When you light a match, the friction heats the head to a temperature at which the chemicals react, producing more heat than escaping into the air and burning in a flame.

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Answer:

22.4 liters

Explanation:

1 Mole of gas occupies 22.4 Litres of volume at STP.

Given, the mass of CO=14 g

Molar mass of CO=12+16=28 g

No. of moles of CO=

28

14

​

=0.5 Moles

So, CO occupies 0.5×22.4=11.2 L at STP.

If 2 isotopes of Osmium existed, Os-190 and Os-191,  one would have the highest percent abundance is Os - 190.

The isotopes are elements of the same family that all have the same number of protons but have the different number of neutrons. The two common type of isotopes of osmium is Os - 190 and the Os - 191. The isotopes whose mass is closer to the the relative atomic mass of osmium would have the highest percentage of the abundance. that is osmium 190.

Thus, If 2 isotopes of Osmium existed, Os-190 and Os-191,  one would have the highest percent abundance is Os-190.

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0.28986 M mass of potassium nitrate can be produced from the reaction of 30.00ml of 0.10m nitric acid with 15.00ml of 0.25m potassium carbonate

V₁S₁ = V₂S₂ ( V₁  is the volume of acid ,S₁ is the strength of acid, V₂ is the volume of base , S₂ is the strength of base)

So, S1= V2S2 /V1

Putting the values ;

S1= V2S2 /V1

=> S1 = (32.58×0.08897)/10.00

=> S1 = 0.28986

concentration of solution of phosphoric acid = 0.28986 M

One or more chemicals, sometimes referred to as reactants, are changed into one or more new substances, referred to as products, during a chemical reaction. Chemical elements and compounds are both substances. reacting in action, procedure, or example. opposition to a movement, power, or effect The transformation of one or more chemicals into one or more other compounds is known as a chemical reaction. Examples include how rust is created when iron and oxygen combine. Making sodium acetate, carbon dioxide, and water from vinegar and baking soda. Exploding or burning items

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A glow stick is an example of a device that directly converts chemical energy into light energy.

A) A glow stick generates luminance, or light energy, using chemical energy from the compounds contained within it. When the stick is broken or twisted, the chemicals inside it are released and, through a chemical reaction, chemical energy is transformed into light energy.

B) plants employ light energy during photosynthesis to create oxygen and energy in the form of sugar (glucose).

C) The wind serves as the energy source for a windmill, and when the rotor blades revolve, the wind energy is transformed into mechanical energy. Then, electrical energy is created from that mechanical energy. The light energy produced by these electrical currents is subsequently employed in lamps. As a result, the chemical energy is not changed directly.

D) Water provides mechanical energy to a hydroelectric dam. When the water reaches the turbine, the gravitational potential energy that it had because of its height is transformed into kinetic energy. Then electrical energy is created from this kinetic energy.

Therefore, Glow Stick is the sole example where chemical energy is transformed into light energy in this manner.

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Quantitative measurement is being employed in a map of countries depicting the number of gold metals they won at the most recent olympics.

In this measurement the numbers are counted that thus can be used as reference tool. Numbers are used to express quantitative data, which are measures of values or counts. Numerical variables are the subject of quantitative data (e.g. how many; how much; or how often). Qualitative data can be represented by a name, symbol, or number code and are measures of "types."

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A  time when you experienced microaggression was when i wnet to college in another state. The lecturer in one of my course was very angry that i left my tribe, my state to another state to study. There was element of mockery in his voice.

I felt sad, angry and also bad at the same time. I just wanted to run away from the class because all eyes were on me.

Microaggressions relate to ionization energy through the power they command or hold. I can explain Microaggressions  as ionization energy to someone  as having the power to aggressively give out a part of you that can be good or bad.

Ionization energies gauge an atom's propensity to resist losing electrons. For instance, removing an electron from a neutral fluorine atom to create a positively charged ion requires a significant amount of energy.

Note that Microaggressions are everyday verbal, behavioral, or environmental slights that signal hostility, denigration, or negative views toward stigmatized or culturally marginalized groups. They can be deliberate or inadvertent. Chester M., a psychiatrist at Harvard University, originated the phrase.

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Among the following, the most probable questions that could ask to the farming community are options 1 and 4. These questions addresses the issue and advantages of a crop field.

Farming is way of growing plant or animal varieties cultivating for food and sail. Better planning and designing of farm field gives benefits for farmers.

Farmers should aware of each varieties of their crop and its growth conditions and disadvantages also. Hence the probable questions that could ask to a farming community are does this plan take into consideration damage to the crops caused by extreme weather events

And the fourth option also will this plan increase our farming communities access to new varieties of seeds?

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The intial temperature of both the acid and the base were 22.6 oc, but they rose to 28.2 oc during the reaction. if the calorimeter constant was 78.5 j/oc   Initial temperature = final temperature - change in temperature

Initial temperature is the average temperature of the contents of the coldest processing container at the start of the thermal processing cycle, as determined by thoroughly stirring or shaking the filled and sealed container. 32°F (0°C). Tell your audience that the freezing point is the  intial temperature at which fresh water begins to freeze. When a liquid turns into a solid, that temperature is known as the freezing point. Water turns from a liquid to a solid at a temperature of 32°F (0°C), which is known as the freezing point.

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The molarity of the K₂CO₃ solution is 2.36 M.

The unit of molarity is molar or M is the same as moles per liter, when n moles of a compound appear that have been dissolved in V liters of solution, the molarity formula is [tex]M = n/V[/tex]

M = molarity

n = number of moles

V = volume of solution

The concentration of the solution states the quantitative composition of the substance that has been dissolved and the solvent in the solution. Determination of the concentration or vice versa depends on the number of solution ratios of each substance that enters. Chemical reactions occur during the process and result from the presence of the same solution.

So, the molarity of the K₂CO₃ solution is:

[tex]M =6.63/2.8[/tex]

[tex]=2.36[/tex] M

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The temperature of 0.43 mol of xe gas contained in a 2.65 l container is 2.79 K.

An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.

Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.

An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect on the behavior of the gas. The real gas that acts almost like a really perfect gasoline is helium. that is due to the fact helium, in contrast to maximum gases, exists as an unmarried atom, which makes the van der Waals dispersion forces as low as viable

Using the ideal gas equation:-

Given;

PV = nRT

T = PV/nR

    = 3.77 ×  2.65 / 0.43 × 8.314

    = 2.79 K

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