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e organic COMPOUNDS are compounds that EASILY become vapours or gases. They are RELEASED from BURNING fuels such as WOOD , coal or natural gas .

precolation of WATER

Y:-                   Set apparatus as shown in figure in class 10 ncert science text page 19   fig.2.1                Take about 5 ML of dilute sulphuric acid in a test TUBE and add few pieces of zinc granules into it    OBSERVATION:-                               We can observes some gas evolved.    allow the gas to pass through soap solution .we saw some bubbles are formed in the soap solution . Take a burning candle near a gas filled BUBBLE.Then the bubble will BURN with a pop sound.               From this activity we can CONCLUDE that acid react with metal to give salt hydrogen gas.            acid+metal⇒salt+hydrogen gas

mic reaction .It is an EXOTHERMIC reaction because it releases heat along with PRODUCTION of other PRODUCTS.

ction of METAL X with ferric oxide is highly exothermic and also metal X is OBTAINED from its oxides by ELECTROLYTIC reduction. So metal X is ALUMINIUM and its reaction with ferric oxide is: 2Al(s) + Fe2O3(s)  2Fe(s) + AL2O3(s) ;   H = - 850 kJ

3O2 ------------------> 2ZnO + 2SO2ZnO + 2H ---------------> ZN + H2O

and sodium LAMPS EMITTED LIGHT of different COLOUR because of impurity defect

allest UNIT of mattercation- POSITIVELY CHARGE IONS

, alkenes and alkynes are simple hydrocarbon CHAINS with no functional GROUPS. Alkanes are identified because the carbon chain has only single bonds. ... Alkenes have at LEAST one DOUBLE BOND and alkyneshave at least one triple bond. The most common alkyne is ethyne, better known as acetylene.

ten aluminium sinks to the bottom of the CELL, where it is tapped off. This OXYGEN reacts with the CARBON of the positive electrodes, FORMING carbon dioxide, so they gradually BURN away. As a result, the positive electrodes have to be replaced frequently. This adds to the cost of the process.

allic oxides react with bases to give salts and water. Here metal in base reacts with carbon DIOXIDE to FORM a salt. HYDROGEN adds with oxygen in non- metal oxide to form water. This is similar to neutralisation reaction so non metallic oxides are acidic in NATURE

8,1 Na^+ : 2,8 Na -1 e = Na ^+Yes, SODIUM atom has one shell more COMPARED to it's ION. 2,8 is Ne ( neon)

rm highly stable OXIDES. A lot of energy is required to reduce them, hence heating is not prefered .They are PLACED above carbon and hydrogen in the electrochemical series THEREFORE cannot be reduced by reducing AGENTS. The only OPTION left is eletrolytic reduction.

re of METALS is CALLED an ALLOY .

e pH of the rain WATER gets LESS than 5 then acid rains form

.1/ 152= .11Molarity= .11/.1= 1.1 moles/litre

y=moles of solute/volume of solution=0.2/0.5=0.4

the reaction that OCCURS when an antacid CONTAINING the active ingredient calcium carbonate (CaCO3) reacts with stomach ACID (hydrochloricacid). CaCO3 + 2HCl → CaCl2 + CO2 + H2O The HYDROGEN carbonate anion is also a BASE.

is seperated and MOLECULES FRO COMPOUNDS MAKING them SOLID

ll be on FILTER PAPER as it's PARTICLE is larger than chalk dust

your QUESTIONS PLEASE EXPLAIN

- 0.025 atmSolution:- The given balanced equilibrium EQUATION is:2NO_2(g)\leftrightarrow 2NO(g)+O_2(g)2NO2​(g)↔2NO(g)+O2​(g)From the equation, there is 2:1 mole ratio between NO and O_2O2​ .Their equilibrium partial pressure would be in the ratio. Equilibrium partial pressure of oxygen is given as 0.25 ATM. So, the equilibrium partial pressure of NO = 2(0.25 atm) = 0.50 atmEquilibrium expression for the given equation is written as:Let's plug in the VALUES in it and solve it for equilibrium partial pressure of NO_2NO2​ . Let's SAY the equilibrium partial pressure of nitrogen dioxide is p.100=\frac{(0.50)^2(0.25))}{p^2}100=p2(0.50)2(0.25))​100=\frac{0.0625}{p^2}100=p20.0625​On rearranging the above equation:p^2=\frac{0.0625}{100}p2=1000.0625​On taking square root to both sides:p=\frac{0.25}{10}p=100.25​p = 0.025 atmSo, the equilibrium partial pressure of NO_2NO2​ is 0.025 atm.

lift the bucket of water in water because there is an UPWARD force ACTING on bucket of water. This upward force is called as Buoyancy.This is why we can lift bucket of water easier in water than in AIR

isomerism: A chiral complex is OPTICALLY ACTIVE if its structure can not be SUPERIMPOSED on its mirror IMAGE. The CONDITION necessary for a molecule to exhibit Optical isomerism is the absence a rotation reflection axis(Sn).

they don't RELEASE H+ IONS in the SOLUTION...

point of ETHYLENE GLYCOL and 10% of WATER is 197.3 °C (387.1 °F; 470.4 K)

mental pollution is the process of making LAND WATER AIR or other parts of the environment dirty and not safe for use.Causes of pollution are1)The smoke from the vehicles CAUSE air pollution.2) Throwing agricultural waste causes SOIL pollution.3)Industries throw chemicals in to the water this causes water pollutionThere are many other reasons for environmental pollution.Hope u liked it.please mark as brainlist.

ave seen water pollution in my area.1)I will make people AWARE,not to urine on the ROAD side2) I will tell people not to split .3) Always throw WASTEWATER water bottles or any waste in the dustbin

nsuranium ELEMENTS are the chemical elements with atomic numbers GREATER than 92, which is the atomic NUMBER of uranium. All of these elements are UNSTABLE and decay radioactively into other elements.

hows anomalous behaviour in its groups because of its small size and non-availability of d ORBITALS. Itresembles SILICON, the second MEMBER of the next higher group. Both boronand silicon are non-metals, and exist in allotropic forms. They have high melting POINTS and are semiconductors.....HOPE IT HELPS YOU MATE.....PLZ..... MARK IT AS BRILLIANT.....

erur answer FOLLOWS..when magnesium ribbon is BURNT in aira white ash is PRODUCED,which is also KNOWN as magnesium oxide.the chemical equation is2Mg+O2-------->2MgOThis is a chemical CHANGE because• the change cant be reversed • a new substance is made Hope this will help uRegardsDivya^_^

cepts Weight/Volume Percentage Concentration is a measurement of the concentration of a soluton.  weight/volume percentage concentration is usually abbreviated as w/v (%)  To calculate w/v % concentration:  w/v (%) =      mass of solute (g)      volume of solution (mL)× 100  COMMON units for w/v% concentration are g/100mL (%)  Solubilities are sometimes GIVEN in units of grams of solute per 100 mL of WATER, that is, as a weight/volume percentage concentration.  weight/volume is a useful concentration MEASURE when dispensing reagents.  Note that weight/volume is ALSO referred to as mass/volume.  mass/volume can be abbreviated as m/v  mass/volume percentage concentration is abbeviated as m/v %

ies Color: bright green Stability on air: not stable, dehydrate after a day on DRY air. Store in tightly closed container. Preparation I used the following procedure: Prepare iron (III) HYDROXIDE Fe(OH)3. Oxide Fe2O3, and intermediates between them are good too, though they are less reactive. The easiest way is reaction between FeCl3 and NaOH or soda NaHCO3. Dissolve Fe(OH)3 in hot oxalic acid solution, taking 3 MOLES of acid per 1 mole of Fe(OH)3. This would produce dark greenish-brown solution of iron (III) oxalate Neutralize excess of acid with NaOH or soda. Brown solution would turn bright green - color of the complex ion [Fe(C2O4)3]3+. Filter it and crystallize the COMPOUND from it. Total equation is: Fe(OH)3 + 3H2C2O4 + 3NaHCO3 → Na3[Fe(C2O4)3] + 6H2O + 3CO2 Growing My samples were grown using slow EVAPORATION method, growth time is 2 weeks. The compound crystallizes very well, large and transparent crystals are easy to get. Solubility is much bigger than of potassium analog, my rough estimate is about 60g/100ml. According to the literature, the compound is light sensitive, decomposing on strong light. It appears to be stable under regular room light though. Safety It is not especially dangerous, though significant amounts of oxalates can be poisonous.

thane dispersions are being used increasingly in industrial applications. Because of the high cost of these dispersions they are being employed where the performance achieved with WATERBORNE acrylic, alkyd, polyester and epoxy RESINS is not adequate, or they are being used in combination with other resins to improve certain properties. I will discuss the problems associated in formulating polyurethane dispersions, how these systems can be pigmented, and crosslinked with EITHER melamine or polyisocyanate crosslinker and how to catalyze these FORMULATIONS. In addition I plan to discuss how to COMBINE these polyurethane dispersions with other polymer systems.

mpounds are the one who has chiral centre but also has plane of symmetry.in 1st option, there are no chiral centres, but has Plane of symmetry. You might be confused that there is chiral centre. No, it isn't! the methyl group ATTACHED to the CARBON has chiral carbon. but no. when you see from both the sides symmetric carbon CHAIN is observed hence there is no chiral centre. no meso compounds possible.In 2ND option, there are two chiral centres i.e. carbon attached to methyl group because on  moving from both the sides we get unsymmetric chain. Thus, there are to chiral centres. And we also get plane of symmetry. Hence, it is a meso compound.In similar way you can see tat over there also in 3rd option we have chiral centres but no plane of symmetry. hence no meso compound.THUS, ANSWER TO THIS QUESTION IS (2) OPTION.PLEASE DO APPROVE!! IF YOU ARE SATISFIED BY THE ANSWER