




Card 18 / 27:
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

Keyboard Shortcuts
Previous Card 
← Previous Card Button 
Next Card 
→ Next Card Button 
Flip Card 
↑ / ↓ / Return / Space 
Questions & Answers
A measure of the amount of matter contained by a given volume.
The ratio of one quantity to that of another quantity.
Anoruo
mass divided by volume i.e. g/cm^3
Walter
the concentration of a substance in solution, expressed as the number moles of solute per litre of solution
Anoruo
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.
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
Nazifa
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!
Nazifa
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.....
Nazifa
Using solubility= mass of solute/mass of solvent x 100, we reach the answer.
Nazifa
Note: we will not use the volume of solution to be 100 cm^3, because then the solution will be dilute.
Nazifa
plz do correct me if I'm wrong!! ☺️
Nazifa
is like the answer is 900
lynda
how can I make citric acid crystals from lemon juice
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?
no clue how this works
is there a VERY SIMPLE tutorial
double bond are 2 atom that share four electron they are typical covalent bond that occur in alkene for example c2 h4
abdulaziz
what is the differentiate property of alkynes
Fifa
Am new ,hope am warnly welcome
when you are sqaring exponetlias does the exponent become positive if it was negative?
but those these postulate still stand in today's chemistry context?
how can one knows the require coefficient of the reactants and balance it up with the products?
Fwangshak
how does the symbolic work
how do you work out the practicals
how many grams of calcium contain atoms of calcium equal to iron atoms in 5.6g of iron
Source:
OpenStax, Chemistry. OpenStax CNX. May 20, 2015 Download for free at http://legacy.cnx.org/content/col11760/1.9
Flash Cards plugin by Curtis Blackwell github.com/curtisblackwell/flash_cards
Google Play and the Google Play logo are trademarks of Google Inc.