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The lanthanide contraction is the greater-than-expected decrease in ionic RADII of the elements in the lanthanide series from ATOMIC number 57, lanthanum, to 71, lutetium, which RESULTS in smaller than otherwise expected ionic radii for the subsequent elements STARTING with 72, hafnium

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A piece of paraffin wax of DENSITY 0.9 g/cc floats on WATER. Alayer of turpentine density 0.87g/cc is added on TOP of water unit the wax is ENTIRELY submerged. the ratio of the volume of wax immersed in water to that in turpentine is 3:10 .

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ta is a framework that you use to MANAGE the model LAYER objects in your application. It provides generalized and automated solutions to common tasks associated with OBJECT life cycle and object GRAPH management, including PERSISTENCE.

tion:The grains are about the size of peas, and adhere in regular rows AROUND a white, PITHY substance, which forms the EAR. The maximum size of kernels is reputedly 2.5 cm (1 in). An ear commonly holds 600 kernels.

Redox potential is a MEASURE of the tendency of a CHEMICAL species to acquire electrons from or lose electrons to an ELECTRODE and THEREBY be reduced or oxidised respectively. Redox potential is measured in VOLTS (V), or millivolts.

Our BODY WORKS with a PH of 7.0-7.8pH of SOIL is 6.5-7.5

tion:15 µg/L.Accounting for other sources of lead exposure (e.g., FOOD, dust), the U.S. EPA SET the MAXIMUM allowable concentration of lead in public drinking WATER at 15 µg/L.

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OR IS A TYPE OF SUBSTANCE IS USED TO INDICATE AN ACID OR BASE .

Therefore, area is dimensionally REPRESENTED as [M0 L2 T0].PLEASE make this QUESTION brilliant.

Explanation:Not all BASES are alkali but all alkali is base. It is a basic SALT alkali earth metal or alkali metal.IN EXPLANATIONED WAY:-)Bases may either be soluble or insoluble in water. Therefore, all alkalis are bases because they will all neutralize acids, but not all bases are alkalis because not all bases will dissolve in water. An example of an alkali is SODIUM hydroxide.

Lemon and CURD EXPLANATION:Lemon and curd are substances that have ACIDS in them and bees have acids in their stings.I HOPE it will help you

write the given data first and SOLVE the problem.GIVEN:❆ Density (d) = 1.292 g/L❆ Volume of Air (v) =  6L❆ Temperature (t) = 20°C = 20 + 273 = 293 KNote:-S.I unit of temperature is 'Kelvin' so we need to convert its value from °C to K . To do that just we need to ADD the +273 with given temperature.❆ Pressure (P) = 755 mm of Hg =  = 0.99 atm ≈ 1 atmNote:-Standard S.I unit of pressure is "atmospheric pressure".But here it is given mm of Hg so we need to divide the given value by 760 to obtain the resultant atm pressure value.SOLUTION:✧ Density = Mass/Volume {Here Volume is given as standard S.T.P so we need to take it value as  22.4 L}1.292 g/L × 22.4 L = Mass  {L and L will get cancelled}Mass = 28.94 grams✧ We need to use the gas formula to find the weight of 6L of airPV = nRTHere,✯ P = Pressure✯ V = Volume✯ n = Number of moles✯ R = Universal Gas constant = 0.0821 is its value ✯ T = temperature1×6 = ×0.0821×2936  =  Weight/28.94 ×25.0556 × 28.94 = weight × 25.055173.64 = Weight × 25.055173.64/25.055 = Weight Weight = 7.218 gramsW ≈ 7.2 gramsHence it weight will be 7.2 grams at 6LTo calculate any values RELATED to ideal gas, Then use ideal gas equation PV = nRT n can ALSO be taken as w /G.M.W Where ✯ P = Pressure✯ V = Volume✯ n = Number of moles✯ R = Universal Gas constant ✯ T = temperatureAlso u need to note the ✯ Mass × Volume = Density With these formulas u can calculate any sum regarding to ideal gases.Hope it helpsThanks for asking:-)

Carbon cannot reduce SODIUM because sodium is stronger than carbon. So carbon can displace these metals from their compounds to form PURE metals. To extract REACTIVE metals like sodium and potassium, a more EXPENSIVE method, electrolysis, has to be used.HOPE ITS HELP U#AKASH❤️

tion:Answer500 CM 500 cm 3500 cm 3 of 0.1 M HCl corresponds to 0.5×0.1=0.05 moles of hydrogen ions.500 cm 3 of 0.1 M HCl corresponds to 0.5×0.1=0.05 moles of hydrogen ions.200 cm 500 cm 3 of 0.1 M HCl corresponds to 0.5×0.1=0.05 moles of hydrogen ions.200 cm 3500 cm 3 of 0.1 M HCl corresponds to 0.5×0.1=0.05 moles of hydrogen ions.200 cm 3 of 0.2 M NAOH corresponds to 0.2×0.2=0.04 moles of HYDROXIDE ions.500 cm 3 of 0.1 M HCl corresponds to 0.5×0.1=0.05 moles of hydrogen ions.200 cm 3 of 0.2 M NaOH corresponds to 0.2×0.2=0.04 moles of hydroxide ions.sodium hydroxide is completely neutralize by Hcl500 cm 3 of 0.1 M HCl corresponds to 0.5×0.1=0.05 moles of hydrogen ions.200 cm 3 of 0.2 M NaOH corresponds to 0.2×0.2=0.04 moles of hydroxide ions.sodium hydroxide is completely neutralize by HCLTHE enthalpy of neutralisation is 57.3 kJ/mol. For 0.04 moles, the enthalpy of neutralisation is 0.04×57.3=2.292 kJ

plz englishExplanation:if u give the QUESTION in ENGLISH i will ANSWER u correctlythank you

at hot air balloon has a VOLUME of 2800 m at 99kpaTo find what is the volume at 80 kpa t constant temperature. SolutionVapor pressure or equilibrium VAPOR pressure is DEFINED as the pressure exerted by a vapor in thermodynamic equilibrium with its condensed PHASES at a given temperature in a closed system. The equilibrium vapor pressure is an indicationof a liquid's evaporation rate. V, = initial volume = 2800 m3T, = initial temperature=D99+273.15=372.15 =T2=final temperature =80+273.15=353.15k we KNOW thatV, T1 = V2/T2V2 = (2800x353.15)/372.15 =V2 = 2657 m3Hence the volume of the balloon is2657 m

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The NUMBER of OXYGEN MOLECULES =22. 41×6 so (C)

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Hydrogen Peroxide is a peroxide and oxidizing agent with disinfectant, antiviral and anti-bacterial activities. Upon rinsing and gargling or topical APPLICATION, hydrogen peroxide exerts its oxidizing activity and produces free radicals which leads to oxidative damage to proteins and membrane LIPIDS. This may inactivate and destroy PATHOGENS and may prevent SPREADING of infection.PubChem CID784StructureHydrogen peroxide_small.pngHydrogen peroxide_3D_Structure.pngFind Similar StructuresChemical SafetyOxidizer CORROSIVE IrritantLaboratory Chemical Safety Summary (LCSS) DatasheetMolecular FormulaH2O2Synonymshydrogen peroxide7722-84-1perhydroloxydolSuperoxol

tion:Acids, Bases, and the PH Scale. We begin with two water MOLECULES, and move some hydrogen atoms around. One water molecule gains a hydrogen and therefore takes on a positive charge, while the other water molecule LOSES a hydrogen atom and therefore becomes negatively charged.

When ELECTRONS are subjected to an electric FIELD they do move randomly, but they slowly drift in ONE direction, in the direction of the electric field applied. The net velocity at which these electrons drift is known as drift velocity.Explanation:Mark me as brainliest if you're kind, not if you're a miser(And I KNOW it's from a search engine, but co-operate)

tion:10^23 molecules of nitrogen GAS are enclosed at pressure of 0.829 atm at 20°Cg) -----------> 4B (g) at constant pressure.Volume of reaction mixture increases from 23.4L to 45.8L at 1 atm pressure and 273K temperature in 10 seconds. Calculate RATE of reaction?g) -----------> 4B (g) at constant pressure.Volume of reaction mixture increases from 23.4L to 45.8L at 1 atm pressure and 273K temperature in 10 seconds. Calculate rate of reaction?g) -----------> 4B (g) at constant pressure.Volume of reaction mixture increases from 23.4L to 45.8L at 1 atm pressure and 273K temperature in 10 seconds. Calculate rate of reaction?g) -----------> 4B (g) at constant pressure.Volume of reaction mixture increases from 23.4L to 45.8L at 1 atm pressure and 273K temperature in 10 seconds. Calculate rate of reaction?

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good MORNING I am not SURE if you have any questions or concerns please VISIT the plug-in settings to determine how attachments are handled and you can see the ATTACHED file is scanned image in PDF format

tion:1921 KJ mol-'. ENTHALPY CHANGE of formation of water is –286 kJ mol.

tion:Citric ACID | C6H8O7 | CID 311 - STRUCTURE, chemical NAMES, physical and chemical ... Molecular Formula, C6H8O7 or (a)C6H8O7( ANHYDROUS) or ... Citric acid 50% SOLUTION in water....

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The lower the pressure of a gas, the greater its volume (BOYLE's LAW); at LOW pressures, V273 will have a larger value. Charles' and Gay-Lussac's Law can be expressed algebraically as ΔVΔT=constant Δ V Δ T = constant or V1T1=V2T2 V 1 T 1 = V 2 T 2 .

tion:An amphiprotic SUBSTANCE is one which can both donate hydrogen ions (protons) and also accept them. Water is a good example of such a compound. The water acts as both an acid (donating hydrogen ions) and as a BASE (by accepting them). The "protic" PART of the word refers to the hydrogen ions (protons) either being donated or accepted. Other examples of amphiprotic compounds are amino acids, and ions LIKE HSO4- (which can lose a hydrogen ION to form sulphate ions or accept one to form sulphuric acid).But as well as being amphiprotic, these compounds are also amphoteric. Amphoteric means that they have reactions as both acids and bases