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As mass of CO2= 44u And mass of CaCO3= 100u Therefore percentage= 44/100x100 = 44%

a) Matter: Anything that occupies space and has mass is known as matter.

The four examples of matter are. iron, milk, hydrogen etc are some examples of matter

A PHYSICAL SUBSTANCE THAT OCCUPIES SPACE AND HAS MASS IS CALLED MATTER 1.MADE UP OF TINY PARTICLES 2.PARTICLES OF MATTER ARE VERY SMALL3.PARTICLES HAVE SPACES BETWEEN THEM 4.PARTICLES OF MATTER ARE MOVING CONSANTLY

all of thesestates of matterphases of mattersand it's chemical composition

Matter is a substance that has inertia and occupies physical space.

Examples books table, cupboard etx

Physical nature of matter: Based on the physical nature of matter there are threeStates of Matter:

Solid: Molecules are tightly packed. They are often hard and rigid.

Liquid: Molecules are loosely packed as compared to that of a solid. They take the shape of the container.

Gas: Molecules of gases are farther apart when compared to liquid molecules

Ans :- Some crystals of Al2(SO4)3 were dissolved in water, the colour of obtained solution iscolourless.option (d) is correct.

2) pink is the correct answer

second pink is the correct answer

pink right answer is option no 2

pink is the correct answer

C ) The surroundings are always in equilibrium with the system.

There are varioussourceswhich causesound pollution in our surroundings, for example, loudsoundof TV., radio, loudsoundof machines in factories, loud musics in parties and honking of horns etc.

Clemmensen reduction.Clemmensen reductionis a chemical reaction described as areductionof ketones (or aldehydes) to alkanes using zinc amalgam and hydrochloric acid. This reaction is named after Erik ChristianClemmensen, a Danish chemist.

option C is the answer.because it is basic as while other options are acidic in nature.

Usesof Calcium Oxide. It is extensively used for medicinalpurposeand insecticides. It finds itsapplicationin manufacturing of cement, paper, and high-grade steel.Limeis used as a reagent in laboratories for dehydration, precipitation, etc.

it is use as reagent in laboratory is the correct answer of the given question

quick lime is highly used in cement , paper and high grade steel.2) for medical purpose and insecticide.3) reagents in laboratory for dehydration, precipitation

it is use as reagent in laboratory and used of calcium oxide

Usesof Calcium Oxide

It is extensivelyusedfor medicinal purpose and insecticides.

It finds its application in manufacturing of cement, paper, and high-grade steel.

Lime isusedas a reagent in laboratories for dehydration, precipitation, etc.

Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature. The broadly used term "lime" connotes calcium-containing inorganic materials, in which carbonates, oxides and hydroxides of calcium, silicon, magnesium, aluminium, and iron predominate. By contrast, quicklime specifically applies to the single chemical compound calcium oxide. Calcium oxide that survives processing without reacting in building products such as cement is called free lime.[5]

It is used as dry agent during the preparation of ammonia.

The word proton is Greek for "first", and this name was given to the hydrogen nucleus byErnest Rutherfordin 1920. In previous years,Rutherfordhad discovered that the hydrogen nucleus (known to be the lightest nucleus) could be extracted from the nuclei of nitrogen by atomic collisions.

Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray. J. J. Thomson won Nobel Prize in 1906 for discovering the elementary particle electron.

Theeffective nuclear charge(often symbolized asis the netpositive chargeexperienced by anelectronin a polyelectronicatom. The term "effective" is used because theshielding effectofnegatively chargedelectrons prevents higherorbital electronsfrom experiencing the fullnuclear chargeof thenucleusdue to the repelling effect ofinner-layer electrons. The effective nuclear charge experienced by theelectronis also called thecore charge. It is possible to determine the strength of the nuclear charge by theoxidation numberof the atom.

The effective nuclear charge is the net positive charge experienced by an electron in a polyelectronic atom.

Number of protons in sulphur is 16Effective nuclear charge=Atomic charge-shielding=32-19.4=12.6

According to law of inheritance, the dominant character appears in the F1 project. Among violet flowers and white flowers, the character of violet character is dominant. So, all the flowers in F1 progeny will be violet.

the correct order. N3-> O2-> F-> Na+

19. Ionisation enthalpy is define as the amount of energy required by an isolated gaseous atom to lose an electron in its ground state. in the periodic table it decreases down the group and it increases across the period from left to right

Answer:B)Pm

Promethium with chemical formula Pm is only lanthanide which is obtained by synthesis.

Radius ratio =r+/r−= 0.414

OR170/rB−= O.414

SOrB−=170/0.414= 410.628 pm

law of constant proportion - law stating that every pure substance always contains the same elements combined in the same proportions by weight.

The law states that in a chemical substances the elements are always present in a definite proportion by mass. It is also termed as law of definite proportion.

1) % of mass of carbon in CO2 is. 12/44*100 = 1200/44 = 27.2727...

2) Law of multiple proportions, statement that when two elements combine with each other to form more than one compound, the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.

when two elements combine in more than one proportion to form two or more compounds the weights of one element that combine with a given weight of the other element are in the ratios of small whole numbers

Therate lawis a differentialequation, meaning that it describes the change in concentration of reactant(s) per change in time. Using calculus, therate lawcan beintegratedto obtain anintegrated rate equationthat links concentrations of reactants or products with time directly.

the correct answer is 2

The law itself can be stated as follows: For a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional. Or Boyle's law is a gas law, stating that the pressure and volume of a gas have an inverse relationship, when temperature is held constant.

From ideal gas eqn. PV = nRT,

moles for O2 => PV/RT => 1*1/RT

no. of molecules,

N = Na/RT............(1)

SIMILARLY FOR SO2,

moles of SO2 => PV/RT => 1*2/RT

no. of molecules,

M = 2Na/RT........(2)

divide both the eqns. we get,

N/M = ½

M = 2N

Molar mass CO2 = 44 g/molYou have 4.4g , so you have 4.4/44 = 0.1 mol CO21mol CO2 has 6.022*10^23 molecules0.1mol CO2 has (6.022*10^23)*0.1 = 6.022*10^22 molecules1molecule of CO2 contains 2 atoms of OTherefore, 6.022*10^22 molecules of CO2 will contain (6.022*10^22) *2 = 1.204*10^23 atoms O

1 mole CO equivalent to 6.02x10^23molecules of CO contain 6.02x10^23atoms of Oxygen. So 6.02x10^24 CO molecules contain 6.02x10^24 atoms of O which is equivalent to 10 gm-atoms of oxygen.Since Oxygen is diatomic, 10 g-atom = 1/2x10 g-molecule of Oxygen =5gram-molecule of O2 =5grams of O2 molecule.

avg at. mass = %1*isotope+%2*isotope/100 = 19*10+81*11/100 = 190+891/100 = 1081/100 = 10.8

The correct option is (d) Two.2. The reaction is as follows :

KI + 2KMnO4+ H2OKIO3+ 2 KOH + MnO2

a) Dalton Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks.

work=-pdV=1.2*10^5(2*10^3-4*10^-3)1.2*10^5(2000-0.004)1.2*10^5(1999.996)=2399*10^5J

Theplant cellisrigidbecause it contains acellwall that is absent inanimal cells. Thecellwall is made up of proteins, cellulose fiber and polysaccharides.

graphite and water are two non metals are good conductor of electricity

since there are three sigma bond equivalents therefore hybridisation should be sp2(lone pair=1 sigma bond equivalent, and two sigma bonds).so structure should be trigonal planar

A=MeltB=EvaporateC=CondenseD=SolidifyE=SublimateF=Desublimate

Ferric chloride = FeCl₃

2Fe(III) + 3Cl₂ ----------> 2FeCl₃

Fe(III) means Fe with valency 3