Select a number of substances with which KOH reacts
1) SO2, HNO3, BaCO3
OR
2) CO2, Zn(NO3)2, H3PO4

Answer:

First one

Explanation:

Because water molecules at the surface of the water puddle attract more to one other than they do to the air molecules above them

Answer:

Question 2:

Cohesion and adhesion

Water has forces of attraction between different molecules, so its molecules are locomotive.

Question 3:

Surface tension

It experiences a perpendicular force which keeps the area of the pepper on surface

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c) 2-hydroxypropanoic acid is the correct Iupac name compound.

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The amount of manganese oxide that should be added is 0.869 moles.

The balanced equation of the reaction is,

[tex]MnO _{2} (s) + 4HCl → MnCl _{2}(aq) + 2 H _{2} O + Cl _{2}(g)[/tex]

The volume of hydrochloric acid that has to be obtained is V.

V = 275 ml

The temperature is T.

T = 5° C = (273+ 5) K = 278 K

The pressure is P.

P = 650 mm of Hg = 0.85 atm

The gas constant is R.

R = 0.0821 L atm/ K mol

The number of moles of chlorine gas that will be produced is,

PV = nRT

[tex] n = \frac{ PV}{ RT }[/tex]

[tex] n = \frac{0.85 \times 0.275}{0.0821 \times 278} [/tex]

n = 0.01 moles

The 0.01 moles of chlorine gas will be produced.

The amount of manganese oxide that should be added to hydrochloric acid to produce 275 ml of fluorine gas is,

[tex]0.01 \: mol \: of \: Cl× \frac{ 1 mmol \: of \: MnO }{mol \: of \: Cl } = 0.01 \: moles \: of \: MnO _{2} \: needed.

[/tex]

[tex]0.01 \: mol \: of \: MnO _{2} = \frac{86.9}{ mol \: of \: MnO _{ 2}}=0.869 \: moles

[/tex]

Therefore, the amount of manganese oxide that should be added to hydrochloric acid to produce 275 ml of fluorine gas is 0.869 moles.

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Quantity of moles of glucose is 0.2 mol.

V (glucose) = 0.500 l; volume of glucose solution

c (glucose) = 0.400 M; concentration of glucose solution

n (glucose) = c (glucose) × V (glucose)

n (glucose) = 0.400 mol/l × 0.500 l

n (glucose) = 0.2 mol; amount of glucose in the solution

Glucose is chemical compound composed of carbon, hydrogen and oxygen atoms connected with covalent bonds.

Volume is the amount of space that a substance occupies.

The mole is the unit of measurement for amount of substance, the mole is an SI base unit, with the unit symbol mol.

The concentration is the amount of solute that has been dissolved in a given amount solution.

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A centrifuge operates on the sedimentation principle, which states that substances divide according to density under the effect of gravitational force (g-force).

Separation methods include density gradient, phase separation, isopycnic, ultrafiltration, and pelleting.

Centrifugation is a process that uses centrifugal force to separate mixtures. A centrifuge is a gadget that, often powered by an electric engine, rotates an item around a given axis, such as a rotor.

Centrifugation protocols generally specify the relative centrifugal force (rcf) and the magnitude of acceleration in g multiples (g-force).

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The mass of iron heated during temperature change is 11.42g

Given:

Temperature (denoted by ΔT) = Final temperature – Initial temperature = 120.0°C – 22.5°C = 97.5°C

Quantity of heat involved (denoted by q) = 501 Joules

Specific heat capacity of iron (denoted by C) = 0.45 J/g°C

To find:

Mass of iron (denoted by m) = ?

Formula:

C = q / (mΔT)

Calculation:

On substitution of the given values in the formula to find the mass of iron by first making mass of iron (m) as the subject of the formula

m = q / (CΔT)

m = 501 / (0.45 x 97.5)

m = 11.42g

Result:

The mass of iron heated during temperature change is found to be 11.42g

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According to the given statement the WHMIS symbols and safety and precautions when handling compressed gas:

Consumer Goods. The Workplace Hazardous Materials Management System (WHMIS) assists in identifying the dangers of items such as chemicals and infectious agents.

WHMIS labels are crucial because workplaces require a defined means of identifying hazardous products. The WHMIS system allocates responsibility for classifying any potential hazards to both suppliers and employers.

Make sure the storage temperature doesn't really exceed 52°C (125°F). Compressed gas cylinders should be stored, handled, and used upright. Never roll, drag, or drop cylinders or allow them to collide. Handcarts or other cylinder-moving equipment should be used.

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The normal boiling point of mercury is 629.68 K.

ΔHvap(Hg) = 58. 51 kJ/mol

ΔHvap(Hg) = 58510 J/mol; the enthalpy of vaporization of mercury

ΔSvap(Hg) = 92. 92 J/K·mol; the entropy of vaporization of mercury

Tvap(Hg) = ΔHvap(Hg) ÷ ΔSvap(Hg)

Tvap(Hg) = 58510 J/mol ÷ 92. 92 J/K·mol

Tvap(Hg) = 629.68 K; the boiling point of mercury

The enthalpy of vaporization is the amount of energy that must be added to a substance in liquid state to transform that substance into a gas.

The entropy of vaporization is proportional to the ratio of the degree of randomness in the vapor and liquid phases.

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The number of atoms present in the sample is 2.163 x 10²² atoms.

The mass of the sample is 0.25 g.

The number of atoms present in the sample is calculated as follows;

E = nhf

where

n = E/hf

n = (8600) / (6.626 x 10⁻³⁴ x 6 x 10¹⁴)

n = 2.163 x 10²² atoms

6.02 x 10²³ atoms of Lithium = 6.9 g

2.163 x 10²² atoms = ?

= (2.163 x 10²² atoms x 6.9 g) /(6.02 x 10²³ atoms )

= 0.25 g.

Thus, the number of atoms present in the sample is 2.163 x 10²² atoms. The mass of the sample is 0.25 g.

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93 ml of sulphuric acid is to be added to prepare a 1.5 L solution of sulphuric acid.

The concentration of sulfuric acid is C1.

[tex]C_{1} = 1.6 \: mol/g[/tex]

The volume of the solution after dilution is V2.

[tex]V _{2} = 1.5 \: litres[/tex]

The concentration of solution after dilutions is C2.

[tex]C_{2} = 0.10 \: mol/ \: l[/tex]

Let the volume of sulfuric acid be V1.

The volume of the sulphuric acid is,

[tex]V _{1}C_{1} = C_{2}V _{2}[/tex]

[tex]V _{1} = \frac{C_{2} \times V _{2}}{C_{1} }[/tex]

[tex] = \frac{1.5 \times 0.10}{1.6} [/tex]

= 0.093 litres

The volume of the sulphuric acid is 0.093 litres.

The volume of the sulphuric acid in millilitres is,

1 L = 1000 ml

[tex]0.093 \: l = 0.093 \times 1000[/tex]

= 93 ml

The volume of sulphuric acid is 93 ml.

Therefore, for preparing a 1.5-litre solution of sulphuric acid, 93 ml of sulphuric acid is to be added.

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The factors that will affect the rate of diffusion of gas are as follows:

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Ionic bonding is found in many ceramic structures such as NaCl, MgO, and Al2O3. Atoms have, unlike electrical charges, making them ions, which create an electrostatic attraction between atoms. This causes bonding between atoms.

The ions pack into a regular arrangement. The nature of the ceramic depends on the size of the ion charges and the size of the ions.

For example, the structure shown left is the rock salt structure, such as that for NaCl.

Covalent bonding is found in many ceramic structures such as SiC, BN, and diamond. The atoms in these ceramics are arranged so that each pair of nearest neighbor atoms forms a chemical bond by sharing a pair of electrons.

The high energy of covalent bonds makes these ceramics very stable with regard to chemical and thermal changes.

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The empirical formula will become CuO.

The formula of a specific chemical compound in its most basic form is known as an empirical formula. It's a condensed whole number ratio of the atoms in a formula.

Mass of copper = 15.33g

Mass of oxygen= 19.20g-15.33g = 3.87g

Calculations:

Moles of copper= 15.33 /63.54

Moles of copper =0.24

Moles of oxygen= 3.87 / 16

Moles of oxygen = 0.24

The number of moles of copper and oxygen are same. Hence, the empirical formula will become CuO.

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The action of investigating something or someone; formal or systematic examination or research.

Scientific investigation is what people like you and me use to develop better models and explanations for the world around them.

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I agree that wind power merits more investment and development.

Wind power is renewable resource of energy consumption but it has a few problems associated with it.

One of the issue is in the installation of the wind power plants because most of the wind power plants are located in the remote places which required extensive installation cost.

Wind power plants are also a potential threat to the wild life of the local area. Therefore, development is needed to sort this issue.

Also one of the major problems is the damage to the aesthetics and noise pollution due to which wind turbines.

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Please find the below attached image mentioned in the question

Answer:

1st question is B

Explanation:

metal is a good conductor of heat and electricity

Cscl has a crystal stucture where each cl- ion is surrounded by 8 cs+ ions.

Caesium (Cs+) and chloride (Cl-) ions make up an equal amount of the crystals in caesium chloride. Two ions' radii—169 pm for Cs+ and 181 pm for Cl-—led to a radius ratio of 0.93, which suggests a body-centered cubic structure with a cubic hole.

The minimal ratio is 169/181 = 0.93 for rCs+/rCl-.

What is CsCl structure?

The physical makeup of calcium chloride, abbreviated CsCl. An unending chain of ions makes up the cubic structure of csCl. The cube's eight corners contain Cs (or Cl) ions, while the cube's centre contains Cl (or Cs) ions (thus it is NOT a body-centered lattice since that requires the SAME ion to occupy the edges and center).

Caesium (Cs+) and chloride (Cl-) ions make up an equal amount of the crystals in caesium chloride. Two ions' radii—169 pm for Cs+ and 181 pm for Cl-—led to a radius ratio of 0.93, which suggests a body-centered cubic structure with a cubic hole.

Thus the minimal ratio is 169/181 = 0.93 for rCs+/rCl-.

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In order to prepare a formic acid buffer with a pH of 4.77, a solution with a mole fraction of 10.0 mol HCOONa to 1.0 mol HCOOH is used.

Because formic acid is a weak acid with a pH close to 4.77, try to prepare a formic acid buffer with a little bit more sodium formate than formic acid.

pKa of formic acid is -log (1.7 x 10-4) = 3.77. A formic acid buffer with the necessary pH should be created by combining 10 moles of formate anion with 1 mole of formic acid. Each of these concentrations can be used to modify buffer capacity.

pH = pKa + log [HCOOH]

4.77 = 3.77 + log [HCOOH]

1 = log [HCOOH]

HCOOH = antilog 1

HCOOH = 10

Therefore, the ratio of HCOONa to HCOOH is 10:1

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four signals that expect in the 1H NMR spectrum.

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Answer:

option 2( substance combusts)

Explanation:

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The metric unit of length or distance is most comparable in scale to each of the following English system units for making measurements of a yard.

The most widely used units of distance in the metric measurement system are millimeters, centimeters, meters, and kilometers.

The metric system is a way to measure things.

It is employed in calculations and research all around the world. Here are some instances of measurements made with the metric system;

The unit used to measure lengths and distances is the meter.

In daily life, we use this unit to measure things like the length of a piece of clothing, the distance from school to home, the weight of chocolates, etc.

Eg: 250 grams of potato chips, as an illustration. The unit of weight used here is the gram.

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When two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a reaction.

It is True.

Amino acid molecules make up proteins. Proteins and amino acids are essential to life. After proteins have been digested or broken down, amino acids are still present. To maintain the body, the human body makes proteins from amino acids: Prepare food.

Taking a supplement containing essential amino acids is wonderful because you can do so anytime you choose. While some athletes prefer to take it with meals or a protein shake, others prefer to take it on an empty stomach in between meals.

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A tiny permanent magnet is always susceptible to demagnetization or having the polarity of the magnet reversed by lightning.

Even a permanent magnet is sensitive to induction, which can cause its polarity to change and become stronger, weaker, or even reversed.

Not just in multicellular creatures but also in individual cells and subcellular structures, polarity enables the development of functional complexity. Polar organisation enables physical relationships between areas with various functions in a way that supports function integration across the entire organism.

The polarity of water causes hydrogen bonds to form when adjacent water molecules are drawn to one another by their opposing charges. Other polar molecules and ions, such as many biomolecules including sugars, nucleic acids, and certain amino acids, are likewise drawn to or attracted by water.

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Answer:

Homogeneous mixtures

Explanation:

This is because the substances are fully mixed together

The concentration of [H⁺] is 10⁻⁵ molar, 10⁻² millimolar and 10 micro-molar.

pH is a numeric scale used to specify the acidity or basicity of an aqueous solution.

pH = -log[H⁺], approximately the negative of the base 10 logarithm of the molar concentration of hydrogen ions.

When pH is less than seven (pH<7), solution is acidic (like this example).

pH = 5

[H⁺] = 10⁻⁵ M; concentration of hydrogen ions

Milli (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10⁻³).

Micro (symbol µ) is a unit prefix in the metric system denoting a factor of one millionth (10⁻⁶).

[H⁺] = 10⁻⁵ × 10³ mM = 10⁻² mM

[H⁺] = 10⁻⁵ × 10⁶ µM = 10µM

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The correct answer of this question is 4.

If propane is dichlorinated, the resulting structural/constitutional isomers are the positional ismoers having different IUPAC names.

The resulting possible isomers are:-

1-1, dichloro propane

1-2, dichloro propane

2-2, dichloro propane

1-3, dichloro propane

Thus, we have 4possible constitutional isomers of dichlorinated propane.

Structural isomers or constitutional isomers are also known as constitutional isomers as they have same molecular formula but different in their structure or have different structural formula.

Structural isomers are further divided into five types:-

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When work is done and heat and light are produced, energy is the quantitative quality that is transferred to the body or to the physical system. Energy can be transformed in form but cannot be created or destroyed, according to the rule of conservation of energy.

How much energy is gained by the gold?

"2450 J"

Two heat flows are involved in this issue.

q = heat to melt the gold plus heat to get it to its melting point.

q = q₁ + q₂

q = mcT + mH

The gold is heated by heat (q1)

Putting the values in by using T = T f - T i.

Calculate T = 1064 - 26 and then subtract.

Values should be entered into the q1 formula at T=1038 °C.

Multiplying q1 = 12.4 0.1291 1038.

q₁ = 1662 J

Gold is melted by heat (q2)

Multiplying with q2 = 12.4 63.5.

q₂ = 787.4 J

requisite heat output (q)

Computing q = 1662 + 787.4 and make the addition.

q = 2450 J (to three significant digits)

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