<< Chapter < Page Chapter >> Page >
  • Card 8 / 11:
    activation energy ( E a )

    energy necessary in order for a reaction to take place

  • Keyboard Shortcuts

    Previous Card ← Previous Card Button
    Next Card → Next Card Button
    Flip Card // Return / Space

Questions & Answers

What is chemistry
khausar Reply
Please what nuclear fusion and nuclear fission
في التسمية الشائعة للكيتونات يتم للمجموعة التي phenone إضافة لفظ تحتوي على الفينل
Zahara Reply
what is organic chemistry
God Reply
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?
Define reduction in term of loss or gain of oxygen or hydrogen give an example.
CuO + Mg → Cu + MgO removing oxygen is reduction. here Mg is reducing agent(loss of electrons)
reduction >> reduc(+)ion mean (+)ion reduced mean electron gained by (+)ion (+)ion means H(+).
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
Practice Key Terms 5

Get the best Chemistry course in your pocket!

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.

Notification Switch

Would you like to follow the 'Chemistry' conversation and receive update notifications?