7. The tendency of sound waves to bend when they pass from one medium to a different medium is known as A. refraction C. resonance B. reflection D. interference​

As a result, it is easier to calculate the volume occupied by any number of moles of a given gas when you are aware of its molar volume at a particular temperature and pressure.

V = n ⋅ V molar

The volume will be for 2 moles of a gas at STP.

2 moles⋅22.4L/mol=44.8 L

The volume will be for 0.5 moles.

0.5moles⋅22.4L/mol=11.2L , and so forth.

The ideal gas law P V = n R T is used to determine a gas's molar volume.

PV=nRT→V=nRT/P→Vn=RT/P

Consider the situation where you were requested to calculate the gas' molar volume at 355 K and 2.5 atm of pressure. Because molar volume refers to the space that one mole occupies, you'd receive

V/1 mole=0.082(L⋅atm/mol⋅K)⋅355K/2.5atm=11.6L/mol

1 mole takes up this volume at 355 K and 2.5 atm. It is evident that under these circumstances, any number of moles' volume can be easily calculated:

2moles⋅11.6L/mol=23.2L

0.5moles⋅11.6L/mol=5.8L and so forth.

As a result, it is easier to calculate the volume occupied by any number of moles of a given gas when you are aware of its molar volume at a particular temperature and pressure.

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The concentration of a solution formed by diluting 160 ml of 12.0 m hcl solution to 660 ml is 2.9 M.

given that :

The concentration , M1 = 12.0 M

the volume , V1 = 12.0 mL = 160 mL = 0.160 L

The volume V2 = 660 mL = 0.660 L

concentration , M2 = ?

using the dilution law we get :

M1 V1 = M2 V2

M2 = M1 V1 / V2

M2 = (12 × 0.160 ) /0.660

M2 = 2.9 M

Thus, after diluting the solution with 160 mL of 12 M HCl then the concentration of the solution formed = 2.9 M.

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First ionization energy is the energy required to remove the outermost or highest energy electron from a neutral atom in a gaseous state

Elements that have high ionization energy have smaller atomic radii this is because they require more energy for them to lose an electron

the valence electrons in the outer shell are strongly pulled by the nucleus.

electron affinity is the amount of energy liberated when an electron is added to a neutral atom to form a negatively charged ion

The elements with higher ionization energy have a negative showing that they have the highest tas they will release massive energy if an electron is forced to enter their atoms.

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These amino acids are arranged in a long chain and joined to one another by covalent peptide bonds to form proteins (Figure 3-1). Polypeptides are another name for proteins.

Amino acids are the building blocks of proteins .Proteins and amino are the basic constituents of all living things.  Amines are result of the digestive or breakdown of proteins. The human body uses amino acids to make proteins that help with food dissection.

The benefits of amino acids for many body processes are numerous. You need amino acids for a variety of functions, including food digestion, strengthening soft tissues, supplying energy, and more. It's crucial to consume enough amino acids.

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Vitamin B-6 is the water-soluble vitamin  important in amino acid metabolism, and is a coenzyme in over 100 chemical reactions.

Vitamins are organic molecules, essential micronutrients that organisms need in small amounts for the proper functioning of their metabolism. Essential nutrients cannot be synthesized by the body or are not available in sufficient amounts and must be obtained from food.

The vitamins are classified as either fat-soluble (vitamins A, D, E, K) or water-soluble (vitamins B, C). The difference between these two groups determines how each vitamin functions in the body. Water-soluble vitamins are absorbed quickly and excess is released, whereas fat-soluble vitamins dissolve slowly and excess is stored in the liver, means that it may cause problems.

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Answer:

2

Explanation:

2 is correct because the number of charges on the nucleus increases, causing a stronger attraction for the bonding of electrons (and thus greater electronegativity).

The volume of O₂ will be required to react completely with 27.6 l of C₂H₆ is 96.6liters.

The release of energy occurs as a result of the chemical reaction known as combustion, in which an oxidizing agent and fuel combine to undergo oxidation (usually in the form of heat).

Given equation,

2C₂H₆(g) 7O₂(g)→ 4CO₂(g) 6H₂O(g)

According to the following equation, 7 moles of oxygen are required for the full combustion of 2 moles of ethane.

Avogadro's law states that for a complete combustion of 2 volumes of ethane, 7 volumes of oxygen are required. This means that for complete combustion, 7 liters of oxygen require 2 liters of ethane.

So, the volume of oxygen that can react with 27.6 liters of ethane

= 27.6(7/2) = 96.6liters.

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Suspensions are similar to colloids in that they are both heterogenous mixtures and are not true solutions.

Suspensions differ from colloids in that the particle sizes are larger and settle when left to stand.

Some examples of suspensions are smoke and dust particles in the air.

Suspensions are a heterogeneous mixture of substances in which one substance is dispersed or distributed throughout a second phase. The particles of a suspension when left to stand will settles over time.

Some examples of suspension are dust particles dispersed in air, a gas.

Other suspensions may be solids dispersed in liquids such as in milk of magnesia.

Colloids or false solutions are a heterogeneous mixture of substances that are dispersed throughout a second medium and in which the particles do not settle when left to stand. The articles of a colloid can not be seen with the unaided eye.

Examples of colloids are gels, emulsions, and sols.

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Taking into account the reaction stoichiometry, 15 moles of H₂SO₄ are needed to completely react with 10.0 mol of aluminum.

In first place, the balanced reaction is:

2 Al(s) + 3 H₂SO₄(aq) → Al₂(SO₄)₃(aq) + 3 H₂(g)

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 2 moles of Al react with 3 moles of H₂SO₄, 10 moles of Al react with how many moles of H₂SO₄?

moles of H₂SO₄= (10 moles of Al× 3 moles of H₂SO₄) ÷ 2 moles of Al

moles of H₂SO₄= 15 moles

Finally, 15 moles of H₂SO₄ is required.

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10.45 kJ heat would be needed to change the temperature of 100g water from 10°C to 50°C.

Temperature is the degree of hotness or coldness expressed in phrases of any of several scales, inclusive of Fahrenheit and Celsius. Temperature shows the direction in which warmness electricity will spontaneously waft i.e., from a hotter body to a colder frame.

calculation:-

Heat = ms× change in temperature.

= 100 × 4.2 × 50-10

= 100 × 4.2 × 40

= 10.45 J

The heat of an item is the whole energy of all of the molecular movement inside that item. Temperature is the degree of the thermal power or common heat of the molecules in a substance.

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Equivalence point should, in fact, range from pH 8.0 to 9.6. Indicator's color must change at equivalent moment.  pH range between 8.0 and 9.6 is predicted to be equivalency point for titration using thymol blue.

On "litmus" paper, the indication is most frequently detected. Below pH 4.5, it is red, and beyond pH 8.2, it is blue. Various other commercial pH sheets may display colors for each major pH unit. A blend of indicators called Universal Indicator is able to offer a full spectrum of colors for the pH scale.

Reliable: Measured consistently throughout time and by several data collectors. Useful: Can be applied to show program results and enhance programs. Adequate: Capable of tracking changes over time and advancement toward goals or results. Easy to grasp and interpret: Understandable.

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Answer:

Mosty Oil but it depends there is lots of things that can damage soil  

Explanation:

Answer:

Sheet erosion by water, wind erosion, and rill erosion

The indication of blue color in pH paper means the solution is basic. And green colour represents a neutral solution. The [H+] indicates the hydrogen ion concentration of the solution.

pH of a solution is the measure of H+ ion concentration in a solution. This indicates the acidity or basicity of a  solution. Mathematically pH is the negative logarithm of H+ ion concentration.

A pH of 7 indicates the solution is neutral. A pH more than 7 is basic and the pH below 7 is acidic. Acidic solution gives red-yellow colour in pH scale in a range of 1- 6. The green colour indicates neutral pH of 7.Blue colour indicates basic solutions with a pH range of 8-14.

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Correct option is changing the leaving group from SCN⁻ to Cl⁻

Briefly stated, associative mechanisms entail binding a fresh ligand to the complex compound, whereas dissociative mechanisms entail releasing a ligand from the complex compound.

These patterns of interpersonal assistance are known as associative processes. They participate in at least one area of social life. Dissociative processes separate individuals from one another. They are different in a few different facets of social life.

In Dissociative mechanism, the metal ligand bond should be weak

so dissociation of bond easily takes place.

Cl⁻ is better  leaving group than SCN⁻

Correct option is changing the leaving group from SCN⁻ to Cl⁻.

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Complete question is "Consider a series of Rh(III) reactions known to be activated by dissociative (or ld) pathways.

What is the expected effect of the following changes on the rate of the reactions:

a. An increase on the overall charge on the complex.

b. Changing the leaving group from SCN to Cl

c. Changing the entering group from Cl- to I."

The molecules have been synthesized in experiments similar to the ones performed by miller and urey is DNA.

A cell's genetic material, which carries the instructions necessary for an organism to grow and function. This knowledge is transmitted from one generation to the next through the use of DNA molecules.

The seminal Miller-Urey experiment demonstrated that several of the protein precursors required for life on Earth could be formed using only water, ammonia, hydrogen, and methane as well as electric sparks to simulate lightning. To mimic the chemistry of early Earth was Stanley Miller and Harold Urey's goal.

Hydrogen, methane, ammonia, water, and CH4 were all employed in the experiment (H2). A 500 ml glass flask half-filled with water and a sterile 5-liter glass flask with the chemicals all sealed inside were used as the system.

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Answer:

Explanation:

CO2 and NaCI are both compounds.

A student has a solution of sodium nitrate and believes it is saturated. The  statement provides the best evidence that the solution is saturated is: "When additional sodium nitrate is added, it all settles to the bottom of the container." (Option D)

The chemical compound with the formula NaNO 3 is sodium nitrate. To differentiate it from regular saltpeter, potassium nitrate, this alkali metal nitrate salt is sometimes known as Chile saltpeter. Nitratine, nitrate, and soda niter are all names for the mineral form.

If more solute is added and it still does not dissolve, the original solution has become saturated. If the solute supplied dissolves, the previous solution was unsaturated.

A saturated solution is a chemical solution with the maximum level of bound solvent. The excess solution will not dissolve in a saturated solution. The amount of fluid that can be added to a solvent to form a saturated solution depends on a variety of variables.

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The oxidation of a) 1-hexanol b) 2-hexano c) hexanal with CrO3 in aqueous acid gives 1-hexanoic acid, 2-hexanone and 1-hexanoic acid respectively. The oxidation with PCC gives 1-hexanaldehyde, 2-hexanone and no reaction respectively.

What is PCC?

PCC is also called as pyridinium chlorochromate which is a yellow-orange salt. this is primarily used for the oxidation of alcohols which gives carbonyl compounds as products. It is one of the highly effective oxidizing agents for alcohols.

The oxidation of alcohols with CrO3 gives carbonyl compounds like aldehydes and ketones. With primary alcohol and aldehydes it gives carboxylic acid, whereas with secondary alcohol it gives ketones as products. PCC with primary alcohols give aldehyde, with secondary alcohols give ketone and with aldehyde there is no reaction.

Therefore, CrO3 with 1-hexanol and hexanal gives 1-hexanoic acid, with 2-hexanol gives 2-hexanone. PCC with 1-hexanol gives 1-hexanaldehyde, 2-hexanol gives 2-hexanone and with hexanal there is no reaction.

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Answer:

Pressure = 83,000 Pascals

Explanation:

Force exerted by Earth's atmosphere = 124,500 N

Area of kitchen table on which force is exerted = 1.5 m²

Formula:

[tex] \boxed{ \rm Pressure= \dfrac{Force}{Are}}[/tex]

By substituting values in the formula we get:

[tex] \rm \implies Pressure= \dfrac{124500}{1.5} \\ \\ \rm \implies Pressure=83000 \: Pa[/tex]

The ratio of 30.1 ml of acetic acid to 225 ml of vinegar, expressed as a volume percent (v/v) is 13.38%.

To calculate the volume percent (v/v) of the solution in a 225-ml bottle of distilled vinegar, substitute the following numbers for the formula of volume percent:

Volume of solute/volume of solvent is expressed as a percentage (v/v%); 100 v/v = 30.1 ml/225 ml, or 13.38%.

The ratio of the volume of a solute present in a solution to the volume of the solution as a whole is known as the volume percent of a solution.

In addition, this fraction needs to be increased by 100 since this sort of concentration, which is commonly computed for liquid- and gas-phase solutions.

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The number of moles of HCl in 200 ml of 3 molar solution is 0.6 moles. The mass of HCl needed to prepare 200 ml of 3 molar solution is 22.5 g.

Molarity is a concentration term used to express the amount of solute in a solution. It is the ratio of number of moles of solute to the volume of solution in liters.

Given that the volume of HCl solution to be prepared is 200 ml or 0.2 L. The number of moles of HCl in 0.2 L of 3 molar solution is :

number of moles = molarity × volume in liter

                            =  0.2 × 3M

                            = 0.6 moles

The molar mass of HCl is 37.5 g/mol. Thus mass of 0.6 moles is 0.6 × 37.5 = 22.5 g.

Therefore, the mass of HCl needed to prepare the solution is 22.5 g.

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Answer: 21.876

Explanation:

M = mol/L

M = 3

mol = x

L = 0.2 (200 mL is 0.2 L)

So,

3 = x/0.2 = 0.6 mol

Then,

0.6 multiplied by 36.46 = 21.876

Answer:

Photons; Quantum

Explanation:

this are the answrs in order

Density is referred to as a characteristic property of matter because Option A. the density of a substance is the same regardless of the mass and the volume of the substance at a given temperature.

Density is the substance's mass consistent with the unit of quantity. The symbol most customarily used for density is ρ, despite the fact that the Latin letter D can also be used. Density is the size of ways tightly a cloth is packed together. it's far defined as the mass consistent with unit quantity.

ρ = m/V, wherein ρ is the density, m is the mass of the item and V is the quantity of the object.

The density of a liquid is a measure of how heavy it is for the quantity measured. in case you weigh the same amounts or volumes of two one-of-a-kind beverages, the liquid that weighs extra is greater dense.

The density is of two types, one is absolute density, and the alternative is relative density. Relative density is also called unique gravity, which is the ratio of the density of a material to the density of a reference material. typically, the reference fabric is water.

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Boiling ethanol requires 77.77 kJ of heat energy in joules.

The amount of heat (540 cal/g) required to vaporize one gram of water into one gram of water vapor is known as the heat of vaporization or condensation.

The given parameters:

ethanol's heat of vaporization is equal to 0.826 kJ/g of its mass, which is 94.15 g.

The following formula is used to determine how many joules of heat are needed to boil the ethanol:

Q = 94.15  x  0.826

Q = 77.77 kJ

As a result, 77.77 kJ of heat energy are needed to boil the ethanol.

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It will slow down the reaction rate as the four subunits compete for substrate and thus will show competitive inhibition.

When the inhibitor and substrate attach to the same location, competitive inhibition results. The structural similarity between the substrate and the inhibitor provides the molecular basis for the binding of competitive inhibition at the active site. As a result, the enzyme is "tricked" into identifying and binding the inhibitor. All the subunits of the enzyme are identical and thus they might compete with each for binding to active site and thus slow down the reaction rate.

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The limiting reagent here is the Hydrogen gas

Limiting reagents are substances that are completely used up or consumed  in a chemical reaction, they are also referred to as limiting reactants as well. According to stoichiometry of chemical reactions a fixed amount are reactants are supposed to react with each other in order to complete the chemical reaction, and if some reagent is less in amount for the reaction then it is considered as limiting reagents.

In the above given reaction we can see that 3 moles of Hydrogen gas are required to react with one mole of 1 mole of Nitrogen gas to form 2 moles of Ammonia. But if in case in the reaction only 2 moles of Hydrogen are available with 1 mole of Nitrogen.

In that case we cannot use the whole quantity of Nitrogen, because the whole amount of Nitrogen requires 3 moles of Hydrogen and we have just 2 mole.

Hence we can say that the Hydrogen gas is limiting the reaction and therefore it is called as the limiting reagent

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The phase of a colorimetric titration when the indicator changes color as a result of the reaction The equivalence point and the endpoint are not the same.

In order to ascertain the concentration of a certain species in an unidentified analyte solution, titration is a type of quantitative analysis. A specific chemical reaction occurs between a titrant reactant and an analyte reactant in every titration analysis. This happens through ionized hydrogen (proton) transfer in acid-base titration. The base/acid analyte is put in the flask below the burette, and the acid/base titrant is put in the burette. The analyte-containing flask is slowly titrated, and the reaction's progress is gauged by the pH of the resulting solution. Using a pH meter, this pH can be assessed, or more frequently by using colorimetric titration and an appropriate indicator chemical. Depending on the technique employed, every acid-base titration will proceed to the endpoint or equivalence point.

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The Lewis structure of the molecule and the formal charge are shown in the image attached.

The term Lewis structure has to do with the structure that shows the arrangement of the atoms that can be found in a compound. In the Lewis structure we can find the symbols of the various elements in the compound and then the number of electron pairs that are attached to each of the atoms.

Now we can see that there are formal charges that are attached to particular structures. The formal structures are used to be able to tell us the overall charge that is present in the molecule.

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Metal reactivity is primarily influenced by four factors: nuclear charge, atoms or ions, shielding effect, and subarea arrangement (of electrons).

The continental surface is where most pure metals are found. They are discovered in ores, which are solid materials from which metals and minerals can be extracted. The most of the planet's iron size, which compensates over a percent of it's own mass, is located in its core.

Extraction of the unprocessed ore from the earth is the initial step in the production of metal alloys. The non-metal components, like as rock and rubbish, are eventually deleted from the ore during processing. The subsequent melting and combining of various metal components yields metal alloys.

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The mass of limestone added is 4.8 g.

The equation is given as:

CaCO₃   +  2HCl  ---->  CaCl₂   +  H₂O  +  CO₂

no. of moles of HCl = 0.1 mol

moles of HCl react with NaOH = 0.1 × 31.25 / 1000

                                                    = 0.00312 mol

moles of HCl react with CaCO₃  = 0.1 - 0.00312

                                                     = 0.096 mol

from the above equation 1 mol of CaCO₃  react with 2 mol of HCl

moles of CaCO₃  = 0.096 / 2 = 0.048 mol

mass of CaCO₃  = moles × molar mass

                           = 0.048 × 100

                           = 4.8 g

Thus, a piece of limestone was added to 1 DM cube of 0.1 Mol per dm cube hydrochloric acid after effervescence and stopped 31.25 cm cube of the resulting solution required 25 cm cube of 0.05 mol dm cube sodium hydroxide for complete neutralization.  the mass of limestone added is 4.8 g.

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