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    fourth transition series

    transition elements in the seventh period of the periodic table (fourth row of the d -block), atomic numbers 89 and 104–111

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Questions & Answers

what is thyroid land
lynda Reply
what is density
Fathmat Reply
A measure of the amount of matter contained by a given volume. The ratio of one quantity to that of another quantity.
mass divided by volume i.e. g/cm^3
what's molarity?
Okpaka Reply
the concentration of a substance in solution, expressed as the number moles of solute per litre of solution
Please help me solve this question. A is a solution of 0.995mol/dm cube hydrochloride acid. B was prepared by diluting 10cm cube of a saturated solution of sodium trioxocarbonate (iv) to 100cm cube at room temperature. Assuming that 21.50cm cube of A reacted with 25cm cube of B. Calculate: i. Concentration of solution B in mol/dm cube. ii.Solubility of sodium trioxocarbonate (iv) at room temperature. Equation of the reaction: Na2Co3 +2HCL------> 2NaCL +H2O +CO2.
Mercy Reply
I don't know whether it's ok or not, but the answers I got are: I. 0.428 mol/dm^3 II. 4.54g per 100 g of water
In the first one, I first found out the amount of HCl in mol using moles=concentration x volume. Then I checked the ratio of Na2CO3 to HCl, which is 0.5 to 1. Therefore the moles of Na2CO3 will be half of HCl. Using the amount in moles and the volume as 25 cm^3, I reached my answer!
In the second one, it says that 10 cm^3 has saturated Na2CO3 solution. Using the concentration we found in previous answer, I found out the moles present in 10cm^3. After that, using mass= moles x RFM, I got it's mass. As for the mass of water, we know 1 cm^3 gives 1g, so 10 cm^3 gives 10g.....
Using solubility= mass of solute/mass of solvent x 100, we reach the answer.
Note: we will not use the volume of solution to be 100 cm^3, because then the solution will be dilute.
plz do correct me if I'm wrong!! ☺️
is like the answer is 900
how can I make citric acid crystals from lemon juice
Traceyo Reply
Write the resonance hybrids of furan and thiophene
Hydrolysis of CH3CH2NO2 with 85% H2SO4 gives? 2/Acetaldehyde is oxidised with potassium dichromate and sulphuric acid gives 3/ When benzyl alcohol is oxidised with KMnO4, the product obtained ? 4/ Benzyl chloride is oxidised with KOH4, the 5/
Hydrolysis of CH3CH2NO2 with 85% H2SO4 gives?
How what works
Eric Reply
no clue how this works is there a VERY SIMPLE tutorial
Stu Reply
what are double bonds
Hafsat Reply
double bond are 2 atom that share four electron they are typical covalent bond that occur in alkene for example c2 h4
what is the differentiate property of alkynes
Am new ,hope am warnly welcome
Sarah Reply
yes ur re welcome
when you are sqaring exponetlias does the exponent become positive if it was negative?
Vittorio Reply
but those these postulate still stand in today's chemistry context?
Fwangshak Reply
how can one knows the require coefficient of the reactants and balance it up with the products?
how does the symbolic work
Princess Reply
how do you work out the practicals
Ann Reply
how many grams of calcium contain atoms of calcium equal to iron atoms in 5.6g of iron
Soni Reply

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