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Calcium constitutes 3.64 percent of Earth’s crust and 8 percent of the Moon’s crust, and its cosmic ABUNDANCE is estimated at 4.9 × 104 atoms (on a scale where the abundance of silicon is 106 atoms). As calcite (calcium carbonate), it occurs on Earth in limestone, chalk, marble, dolomite, eggshells, pearls, coral, stalactites, stalagmites, and the shells of many marine animals. Calcium carbonate deposits dissolve in water that contains carbon dioxide to form calcium bicarbonate, Ca(HCO3)2. This process FREQUENTLY results in the formation of caves and may reverse to deposit limestone as stalactites and stalagmites. As calcium hydroxyl phosphate, it is the principal inorganic constituent of teeth and bones and occurs as the mineral apatite. As calcium fluoride, it occurs as fluorite, or fluorspar. And as calcium sulfate, it occurs as anhydrite. Calcium is found in many other minerals, such as aragonite (a type of calcium carbonate) and gypsum (another form of calcium sulfate), and in many feldspars and zeolites. It is also found in a large number of silicates and aluminosilicates, in SALT deposits, and in natural waters, INCLUDING the sea.those who use telegram join @amazingsruffies group please friends PLEASE SUPPORT ME❤️❤️❤️ name of channel cherry the dream girl

Match the items given in COLUMN with columnColumn Black goldColumn (P) PETROLEUM gas in liquid form (Q) Natural gas(R) Petroleum gas PARAFFIN waxLPGCNGCandlesExplanation:thank you❤

21 mv 2 KE= 2mp 2 De-broglie WAVELENGTH,λ= PH λ= 2mE h = 2mVe h Putting the values of CONSTANTS, we get:λ= 2×1.6×10 −27 ×1.6×10 −19 ×1000 6.6×10 −34 =0.9×10 −12 m

dear STUDENT pls STATE yur question clearly so that I can REPLY I with a BETTER reply

Choose the correct INCREASING ORDEROF bond STRENGTHS :(A) HF > HCI > HBr > HI(B) H> HF > HBr > HCL(C) HI > HCI > HBr > HF(D) HCI > HF > HI > HBr

tarun ke bacche mujhe party nhi di.(+_+)Explanation:In the courtroom, the lawyers for each party will either be sitting at the counsel TABLES near the bench or be speaking to the judge, a witness, or the jury. Each lawyer's task is to bring out the facts that PUT his or her CLIENT's case in the most favorable LIGHT, but to do so using approved legal procedures.

tion:POTASSIUM ferricyanide is the chemical compound with the formula K3[Fe(CN)6]. This bright red salt contains the octahedrally coordinated [Fe(CN)6]3− ION.It is soluble in water and its solution shows some green-yellow fluorescence.In K4[Fe(CN)6] , coordination number of Fe2+ is 6. The central metal atom or ion and the ligands of the complex compound are written within square bracket. This is called coordination SPHERE of coordination compounds.

Ka, and Kb, are the dissociationconstants of the acid and the BASE,respectively. IfK, > K, the resultingsolution is:

rengths INCREASE as bond ORDER INCREASES, while bond distances decrease.

tion:GASEOUS benzene reacts with hydrogen gas in the presence of a nickel CATALYST to FORM gaseous CYCLOHEXANE according to the reaction, C6H6(g)+3H2(g)→C6H12(g) A mixture of C6H6 and excess H2 has a pressure of 60mm of Hg in an unknown volume.

which BOARD do you wantExplanation:ICSE,ISC, CBSE or RBSC

the UNCHARGED PARTICLE of an ATOM is NEUTRON

(B) ++++++++++++++++)) Explanation:2The value of one quanta of energy isrepresented by(A) E = hy(B) E = my(C) E = YYNONE of these

ChlorineSolution: As the electronic configuration of the given ATOM is 2,8,7 it is inferred that the ATOMIC number of element is 17 (2+8+7). Thus element with atomic number 17 is Chlorine. Among the OPTIONS given which includes Nitrogen, FLUORINE, Phosphorus and Argon, chlorine is CHEMICALLY similar to fluorine.Explanation:mark me as brainliest

(K) =-LOG(1×10^(-5) =5- LOG1 =5-0=5

a is CORRECT ANSWER

Suddenly, NITESH was STUNG by a HONEYBEE and was in great pain. IMMEDIATELY, his friends call his mother. She applied baking soda SOLUTION on the affected area and then took him to the doctor...

The element with electronic configuration 1s 2 2s 2 2p 6 3S 1 will have HIGHEST second ionization enthalpy. 1s 2 2s 2 2p 6 3s 1 loses one electron to form 1s 2 2s 2 2p 6 . It is stable electronic configuration of noble gas NE. Removal of second electron will require large amount of energy as it will break stable noble gas electronic configuration.

IS, 2.087.10-4 cm/s)The resistances of two solutions A and B of an electrolyte in a CONDUCTIVITY cell are 45OHM and 100 ohm respectively. Find out the resistivity of the SOLUTION obtained bymixing EQUAL volumes of solutions A and B.(0.016 ohm-1)For the 00198 Nacetic acid solution the civolant

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dioxide is an acidic OXIDE (a typical property of the MAJORITY of non-METAL oxides) and reacts with ... and the following Group 2 carbonates leads to the PRODUCTION of carbon dioxide gas and the metal oxide.

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Graphite- used as lubricantHydrogen- WELDING metalsSulphur-imrove physical PROPERTIES of rubberliquid Nitrogen-used as COOLING agent in REFRIGERATION

Chemical Reactions and Equations: Balanced and unbalanced chemical equations and balancing of chemical equations.Explanation:Chemical Reaction: The transformation of chemical substance into another chemical substance is known as Chemical Reaction. For example: Rusting of iron, the setting of milk into curd, digestion of FOOD, respiration, etc.In a chemical reaction, a new substance is formed which is COMPLETELY different in properties from the original substance, so in a chemical reaction, a chemical change takes place.Only a rearrangement of atoms takes place in a chemical reaction.1. The substances which take part in a chemical reaction are called reactants.2. The new substances produced as a result of a chemical reaction are called products.Example: The burning of MAGNESIUM in the air to form magnesium oxide is an example of a chemical reaction.2Mg(s) + O2(g) \(\underrightarrow { \TRIANGLE }\) 2MgO(s)Before burning in air, the magnesium ribbon is cleaned by rubbing with sandpaper.This is done to remove the protective layer of basic magnesium carbonate from the surface of the magnesium ribbon.Reactant: Substances which take part in a chemical reaction are called reactants.Example: Mg and O2.please mark me as in BRAINLIST..

Analytical chemists assess the chemical STRUCTURE and nature of substances. Their skills are NEEDED for a variety of PURPOSES including drug development, forensic analysis and toxicology. Analytical chemists can specialise in areas as varied as toxicology, PHARMACEUTICALS and FORENSICS.

From a RHEOLOGICAL perspective, the primary DIFFERENCE between a viscoplastic and viscoelastic material is the presence of a YIELD stress. A viscoplastic material has a yield stress under which it will not deform, whereas a viscoelastic material will deform at any APPLICATION of stress.Explanation:May you FOUND my answer helpful have a great day please follow and mark as brainliest

) Non-metals USED in fertilisers-K, CL. BEXPLANATION:

A solid component is separated from a liquid by EVAPORATION. When a SALT solution is HEATED, the WATER in the mixture evaporates and salt is left behind in solid form.hope it helps.

Mendeleev's periodic table is, based on relation of properties of elements as DEPENDENT on the atomic weight of element. But MODERN periodic table considers atomic NUMBER as the fundamental PROPERTY that decides the properties of elements. Modern periodic table does CORRECT defects of the Mendeleev's periodic table.

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Hey user !! I THINK there is a mistake in the QUESTION . Chloroacetic acid is stronger than acetic acid : Due to presence of more electronegative atom CL, the electron density on H of carboxyl group of chloroacetic acid is lower compare to of acetic acid and hence chloroacetic acid can release H at easier way. EXPLANATION:HOPE it helps

श्री (लक्ष्मी, शोभा, सम्पत्ति) ईकारान्त स्त्रीलिंगस्त्री (महिला, नारी) ईकारान्त स्त्रीलिंगधेनु (गाय) उकारान्त स्त्रीलिंगवधू (बहू) ऊकारान्त स्त्रीलिंगभू (भूमि, पृथ्वी) ऊकारान्त स्त्रीलिंगमातृ (माता) ऋकारान्त स्त्रीलिंगस्वसृ (बहन) ऋकारान्त स्त्रीलिंगनौ (नाव) औकारान्त स्त्रीलिंगExplanation:हमे आशा है कि हमारा उत्तर अपकी मदद करेगा । आप का दिन शुभ हो।☺️

the CHEMICAL FORMULA

ids cannot flow?They are HELD tightly together by STRONG forces of ATTRACTION. They are held in fixed positions but they do VIBRATE. Because the particles don't move, solids have a definite shape and volume, and can't flow. Because the particles are already packed closely together, solids can't easily be compressed.Why liquids can be compressed? Because the particles can move, liquids don't have a definite shape, and they can flow. Because the particles are still packed close together, liquids can't easily be compressed and KEEP the same volume.