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ANSWER:

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A vessel of 120 mL capacity contains a CERTAIN amount of gas at 35 °C and 1.2 bar pressure. The gas is transferred to another vessel of volume 180 mL at 35 °C. What would be its pressure?

Answer

According to BOYLE’s LAW P1 V1 = P2 V2

Here the TEMPERATURE is constant. Therefore

1.2 X 120 = P2 X 180

OR

P2 = 1.2 X 120 /180 = 0.8 bar

Therefore, the pressure would be 0.8 bar.

Answer:

EXPLANATION:

.a helium-filled balloon rising in the air

2.a hydrogen-filled balloon deflating, due to the GAS passing through the skin

3.the smell of perfume of a person standing on the other side of the room

4.sucking a drink out of a bottle using a straw

5.an ice cream turning liquid when it's left out of the freezer

6.the TEA in the cup changing color when you add milk, without mixing

7.a light, colored gas spreading down the gas jar

8.a blue CRYSTAL forming a blue solution when it is left out sitting in a glass of water

9.spraying paint from a SPRAY paint can

• Bentonite SWELLING power is determined by VARIOUS experimental procedures such as LOADING DIFFERENCE and conditions of wetting. Sometimes the property may vary on the water CONTENT, chemical composition which can be called as grades of bentonite.

ANSWER:

i think OPTION 1 is correct as yellow green gas is chlorine and UNSTABLE trihalide formed will be NCl3 so here we can see that oxidation STATE of NITROGEN changes from -3 to +3.

ANSWER:

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Explanation:

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Answer:

Molecular formula:  

Empirical formula:  

Logic:

FIND mass of each element Find number of atoms of each element in the COMPOUND

Calculation:

Given mass of molecule = 108amu.

Mass of C = 66.70% of Mass of compound =  72.036 amu ≈ 72amu

Mass of H= 7.41% of Mass of compound =  8.0028 amu ≈ 8 amu

Mass of N= 25.90% of Mass of compound =  27.972 amu ≈ 28 amu

No of atoms of C in compound  = 72/12 = 6

No of atoms of H in compound  = 8/1= 8

No of atoms of N in compound  = 28 /14 = 2

Therefore the molecular formula must be,

Therefore empirical formula  

EXPLANATION:

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☞ Answer :-

✒ DECOMPOSITION of calcium CARBONATE to calcium oxide and carbon dioxide on heating is an important decomposition REACTION used in various industries.

✒ Decomposition of SILVER chloride into silver and chlorineby light is used in photography.

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Correction:

Your value is WAY too large.

Solution:

Option D.

Theory Used:

The solubility product CONSTANT is given by,

Therefore,

Using Question DATA:

The precipitation will start when

Which is in option (4)

Answer:

History of Chemistry. ... The four CATEGORIES are: prehistoric TIMES - BEGINNING of the Christian era beginning of the Christian era - END of 17th century (ALCHEMY), end of 17th century - mid 19th century (traditional chemistry) and mid 19th century - present (modern chemistry).

An electrical insulator is a material in which the electron does not FLOW freely or the ATOM of the insulator have tightly BOUND electrons whose internal ELECTRIC CHARGES do not flow freely; very little electric current will flow through it under the influence of an electric field.

Answer:

Communication can be categorized into three basic types: (1) verbal communication, in which you listen to a person to understand their MEANING; (2) written communication, in which you read their meaning; and (3) nonverbal communication, in which you observe a person and infer meaning.

LINGUISTIC/ALPHABETIC ― written and SPOKEN words.

VISUAL ― images (MOVING or still)

AURAL ― sound, music.

GESTURAL ― movement, expression, body language.

SPATIAL ― position, physical arrangement, proximity.

There are three modes of communication (or the way communication is expressed): interpersonal, interpretive, and presentational. Interpersonal communication is two-way communication GOING both ways between individuals, with both being able to evaluate and respond through conversation.

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Answer:

As hydrochloric acid is added to the potassium CHROMATE solution, the YELLOW colour turns to orange. When SODIUM HYDROXIDE is added to the potassium chromate solution, the orange colour turns BACK to yellow. The sodium hydroxide reacts with hydrogen ions, removing them from the solution

Answer:

6 is the CORRECT answer

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Answer:

GIVEN:-

3-5x<-1

To find by:-

By ELIMINATION method:

Solution:-

3-5x<-1

=3+1<5x

=4<5x

=x>0.8

But x is directly RELATED to {-3,-2,-1,0,1,2,3}

Hence,

The solution:-

x={1,2,3}

Answer:

Bragg's spectrometer method is used for studying CRYSTALS using X-rays.

The apparatus consists of a X-ray tube from which a narrow beam of X-rays is allowed to fall on the crystal mounted on a rotating table. The rotating table is provided with scale and vernier from which the angle of incidence θ can be measured.

An arm which is rotating about the same axis as the crystal table, carries an ionization chamber. The rays reflected from crystal enter into the ionization chamber and ionize the gas present inside. Due to the ionization, current produced is measured by electrometer. The current of ionization is a direct measure of intensity of reflected beam from the crystal. For different angles of incidence, the corresponding ionization current is measured from the electrometer. These values are plotted in the form of graph.

For sodium chloride, the maximum reflection for peaks for 100 plane occurred at θ=5.9

0

,11.85

0

and 18.15

0

. The sines of these angles are 0.103,0.205 and 0.312 which are in the ratio 1:2:3. These peaks REPRESENT the FIRST, second and third order reflection. The ratio CONFIRMS the correctness of Bragg's equation.

ANSWER:

DECREASING NON METALIC CHARACTER

ANSWER:

The correct order is

F >O>N>Cl

A covalent bond is a chemical bond that involves the SHARING of electron PAIRS between ATOMS.

properties of covalent compound are:

• LOW melting points and boiling points.
• Low ENTHALPIES of fusion and vaporization These properties are usually one or two orders of magnitude smaller than they are for ionic compounds.
• Soft or brittle solid forms.
• Poor electrical and thermal conductivity.

ANSWER:

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When an object has a positive CHARGE it MEANS that it has more PROTONS than ELECTRONS.

Answer:

The metals list which makes up the periodic table includes iron, lead, gold, aluminum, platinum, uranium, ZINC, lithium, sodium, tin, SILVER, etc. The nonmetals list which makes up the periodic table includes hydrogen, helium, CARBON, sulfur, NITROGEN, oxygen, radon, NEON, other halogens, and noble gases etc

ANSWER:

In order to figure out how many molecules of water are present in that

48.90-g

sample, you first need to determine how many MOLES of water you have there.

As you know, a mole is SIMPLY a very large collection of molecules. In order to have one mole of something, you need to have exactly

6.022

⋅

10

23

molecules of that something - this is KNOWN as AVOGADRO's number.

In order to get to moles, you must use water's molar mass. A substance's molar mass tells you the mass of one mole of molecules of said substance.

Water has a molar mass of

18.015 g/mol

. This means that one mole of water molecules has a mass of

18.015 g

.

So, to sum this up,

6.022

⋅

10

23

molecules of water will amount to

1 mole

of water, which in turn will have a mass of

18.015 g

.

ANSWER:

The major difference between atomic number and MASS number is that the atomic number states the number of protons PRESENT in an atom whereas, the mass number indicates the TOTAL of the number of protons and the number neutrons present in an atom.

ANSWER:

yeah SHOW th ROLE of TURMERIC

Answer:

BETE MAUJ KRDI TUM TO BDE HEAVY DRIVER HO BHI

Answer:

Compost is made with material such as LEAVES, shredded twigs, and kitchen scraps from plants. To gardeners, compost is considered "black gold" because of its many benefits in the garden. Compost is a great material for garden SOIL. ... By ADDING ORGANIC matter to the soil, compost can HELP improve plant growth and health.

Explanation:

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MOLAR mass of sulphuric acid is 1*2 + 32+ 4*16 => 98 grams per MOLE.

So, 2.5 grams of H2SO4 is 2.5/98 => 0.0255 moles

1 mole of H2SO4 FURNISHES 2 moles of of H+ in AQUEOUS state.

So, 0.0255 moles of H2SO4 will furnish 2*0.0255 => 0.051 moles of H+ .

Volume of solution is 250 CC or 0.25 litres.

Molarity of H+ ion in the solution= (moles of H+)/ litres of solution

=> 0.051/0.25

=> 0.051*100/25

=>0.051 * 4 => Molarity of H+ ions= 0.204 M

So, PH of solution = -log (base 10) H+ concentration.

=> - log (base 10) 0.204   (from calculator log (base 10) 0.204 = -0.69)

=> -1 * -0.69

=> 0.69

Hence the PH of the solution will be 0.69 (approximately)

Quicklime has a wide RANGE of uses, including in the PRODUCTION of iron and steel, PAPER and pulp production, treatment of water and flue gases and in the MINING industry. For the iron and steel industry, we ALSO supply different fractions of both reactive shaft furnace-burnt and hard-burnt rotary kiln lime.

Explanation:

Therefore, the molarity of 25% (w/v) NH3 solution is 14.7 M. Acidity of base is equal to the number of displaceable HYDROXIDE ION (OH−) one molecule of the base can GIVE. Consider the ionization of NH3 in solution, i.e. Hence, molarity of 25% (w/v) NH3 solution is 14.7mol L−1 or 14.7 M.

Answer:

Acetamide (systematic name: ethanamide) is an organic compound with the formula CH3CONH2. It is the simplest amide derived from acetic acid. It finds some use as a plasticizer and as an industrial solvent.[4] The related compound N,N-dimethylacetamide (DMA) is more widely used, but it is not prepared from acetamide. Acetamide can be considered an intermediate between ACETONE, which has TWO methyl (CH3) groups either side of the carbonyl (CO), and urea which has two amide (NH2) groups in those lo

Explanation:

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Explanation:

Calcium phosphate is basic salt since it is a source of weak phosphoric acid and a slightly stronger BASE of calcium HYDROXIDE. Calcium phosphate is a mineral comprising calcium ion (Ca2+) and phosphate ion which is inorganic in nature. It is present in the CROWN area of the tooth and ALSO in bones

ANSWER:

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Explanation:

Remember that you will be talking through your ideas and that the audience will be listening rather than reading. The flow. Make sure that your presentation structure leads your audience through your ideas and helps them to DRAW your CONCLUSION for themselves.

ANSWER:

वदति स्म

हसति स्म

पठति स्म

धावति स्म

Answer:

Whereas thermal ENERGY is the measure of the SUM of the kinetic energy of the individual molecules and particles. So the inter-molecular force of attraction KEEPS the particles TOGETHER while the thermal interactions (kinetic energy) make them move APART.

Answer:

842 AMU

Explanation:

The MOLECULE iS C₆₀H₁₂₂  

Molecular mass of C₆₀H₁₂₂ --- [60x12+1x122]

=720+122

=842 Unified mass

Weight of one molecule of C₆₀H₁₂₂ :

=molecular weight of C₆₀H₁₂₂ / AVOGADRO's number

=842/6.023x10²³

=1.4x10⁻²¹ g

∴The weight of a molecule of a compound C₆₀H₁₂₂ is 1.4x10⁻²¹ g

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Answer:

Ionic bonding in SODIUM chloride. An atom of sodium (Na) donates one of its electrons to an atom of chlorine (Cl) in a chemical REACTION, and the resulting POSITIVE ion (Na+) and negative ion (Cl−) form a STABLE ionic compound (sodium chloride; common table salt) BASED on this ionic bond.

Explanation:

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Explanation:

Objective

Our objective is to determine the strength of KMnO4 solution by titrating it against a STANDARD solution of;

OXALIC acid

Ferrous ammonium sulphate (Mohr’s salt)

The Theory

What is Titration?

Titration is a common laboratory method of qualitative chemical analysis that can be used to determine the unknown concentration of a solution (analyte). The basis of this process is the reaction between the analyte and a solution of unknown concentration (standard solution). The analyte is taken in a conical flask using a pipette and the solution of known concentration is taken in a calibrated burette (titrant).

Some Important Terms in Titration

1. Standard solution

A solution whose concentration is known, is called a standard solution. The substance used to prepare a standard solution is called the primary standard. Oxalic acid and sodium carbonate are some examples.

2. Concentration of a solution

Concentration of a solution is defined as the amount of a SOLUTE present in a definite volume of the solvent. Concentration of a solution can be expressed in different ways.

Titration of KMnO4 against Oxalic acid

Preparation of standard solution of Oxalic acid [250 ml M/10 (0.1 M) solution]

The molecular mass of crystalline oxalic acid is, H2C2O4.2H2O = 126

Weight of oxalic acid crystals required to prepare 1000 ml of 1 M solution = 126 g

Therefore, weight of oxalic acid required to prepare 250 ml 0.1

DETERMINATION of strength of KMnO4 using standard solution of oxalic acid

In this titration KMnO4 is the titrant and oxalic acid is the analyte. Here, potassium permanganate is the OXIDIZING agent and oxalic acid is the reducing agent. The reaction between potassium permanganate and oxalic acid is carried out in an acidic medium because permanganate ion in the acidic medium is a very strong oxidizing agent. Acidity is introduced by adding

No other indicators are used to determine the endpoint, because KMnO4 acts as the indicator. Permanganate (MnO4-) ion has a dark purple colour. In an acidic medium, MnO4- is reduced to colourless manganous (Mn2+) ions. On reaching the end point, the addition of the last single drop of permanganate imparts a light pink colour to the solution. The chemical reaction that takes place during titration can be represented by the chemical equation.

Balanced chemical equation

From the balanced chemical equation, it is clear that 2 moles of KMnO4 reacts with 5 moles of oxalic acid

Answer:

Alkanes, alkenes and alkynes are SIMPLE hydrocarbon chains with no FUNCTIONAL groups. The simplest organic compounds are the alkanes. Alkanes have only SINGLE bonds between carbon atoms and are called SATURATED hydrocarbons. ... Alkynes have one or more carbon-carbon triple bonds.

Answer:

FORMATION of soluble COMPLEX anions like [PbCl3]− ... d) formation of polymeric LEAD COMPLEXES. Answer Verified. Hint: PbCl2 is a compound that is insoluble in cold water but the addition of HCL provides the Cl− ions that helps in overcoming the attraction forces and hence increases the solubility of PbCl2.

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<P>ANSWER:

Find a relation between x and y such that the point P(x,y) is equidistant from the points A(7,1) and B(3,5) .

Answer:

The 4f electrons of lanthanides yield three types of transitions: (i) INTERNAL 4f-4f transitions which GIVE rise to sharp, narrow bands of COMPARATIVELY weak INTENSITIES which are LAPORTE forbidden.

ANSWER:

It is measured in ohm-1 = mho = Siemens. If A = 1 CM2 and L = 1 cm, then κ = G. Therefore the specific CONDUCTANCE can be defined as: specific conductance or CONDUCTIVITY (κ): It is the conductance of a material or solution between two electrodes of cross sectional area 1 cm2 and separated by 1 cm distance.

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Answer:

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Explanation:

9 g of water has more molecules.

According to avogadro's law, 1 mole of every SUBSTANCE weighs EQUAL to molecular mass and CONTAINS avogadro's NUMBER of PARTICLES.

Answer:

In atomic physics, the Bohr model depicts an atom as a small, positively charged nucleus surrounded by electrons. These electrons travel in circular orbits around the nucleus—similar in structure to the solar system, except electrostatic forces rather than gravity provide attraction.

Explanation:

According to Bohr Atomic model, a small positively charged nucleus is surrounded by revolving negatively charged electrons in fixed orbits. He concluded that ELECTRON will have more energy if it is located away from the nucleus whereas the electrons will have less energy if it located near the nucleus.

The postulates given by Neils Bohr are:

Electrons REVOLVE around the nucleus in a fixed circular path termed “orbits” or “shells” or “energy level.”

The orbits are termed as “stationary orbit.”

Every circular orbit will have a certain amount of fixed energy and these circular orbits were termed orbital shells. The electrons will not radiate energy as long as they continue to revolve around the nucleus in the fixed orbital shells.

The different energy levels are denoted by integers such as n=1 or n=2 or n=3 and so on. These are called quantum numbers. The range of quantum number may vary and begin from the LOWEST energy level (nucleus SIDE n=1) to the HIGHEST energy level. Learn the concept of an Atomic number here.

The different energy levels or orbits are represented in two ways such as 1, 2, 3, 4…  or K, L, M, N….. shells.  The lowest energy level of the electron is called the ground state. Learn the concept of Valency here in detail

ANSWER:

this DECOMPOSITION REACTION on EQUILIBRIUM reaction does not REACTANT displacely

EXPLANATION:

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Answer:

MAIN Points of the Bohr Model

Electrons orbit the nucleus in orbits that have a set size and ENERGY.

Explanation:

The energy of the orbit is related to its size.

The lowest energy is FOUND in the smallest orbit.

Radiation is absorbed or emitted when an electron moves from one orbit to another.

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