OL Basics Flashcards
(39 cards)
Who discovered the Electron?
J.J.Thomson
Who discovered the Proton?
Ernest Rutherford
Who discovered the Neutron?
James Chadwick
Who introduced the Planetary Model of the Atom?
Ernest Rutherford
What was the statement made by Niels Bohr regarding the atom?
Niels Bohr stated that the Electrons of an Atom orbit around its Nucleus in Definite Paths called Shells
What is Cool Water?
Water at less than Room Temperature
What is Cold Water?
Water at Room Temperature
What is Hot Water?
Water above Room Temperature
The Reactivity Series is;
K / Na / Ca / Mg / Al / Zn / Fe / Sn(Tin) / Pb(Lead) /[H]/ Cu / Hg / Ag(Silver) / Pt / Au(Gold)
How can one test a gas sample for Hydrogen?
A Burning Splinter placed in Hydrogen Gas burns with a “pop” sound
How can you test a gas sample for Oxygen?
A Burning Splinter placed in Oxygen will continue to Burn and a Glowing Splinter placed in Oxygen will Begin to Burn
What happens when CO2 is mixed with Ca(OH)2 (Lime Water) ?
The Lime Water turns Milky White due to the formation of CaCO3
Why does Ca(OH)2 (Lime Water) undergo two colour changes when supplied with Excess CO2 ?
First the Lime Water reacts with the CO2 to form CaCO3 turning the solution Milky White
Second the CaCO3 further reacts with the CO2 to form Ca(HCO3)2 which turns the solution from Milky White to Colourless
What is the Atomic Mass Unit and it’s Value?
The Atomic Mass Unit is 1/12 x Mass of Carbon 12-6 Isotope which equals to 1.67x10^-24 g
How is the Relative Atomic Mass (Ar) of an Atom calculated?
=Mass of the Atom / Atomic Mass Unit
How is the Relative Molecular Mass (Mr) calculated?
= Mass of the Molecule / Atomic Mass Unit
What is the Avagadro Constant(L)?
The Avagadro Constant is the Number of Molecules (N) in 1mol OR 12 g of Carbon 12-6 Isotope
=6.022x10^23 mol^-1
What is the Relationship between the; -number of moles of a substance (n)
-Mass of the substance (m)
-Molar Mass of the substance (M)
n=m / M ;
-n: mol
-m: g
-M: g.mol^-1
What is the Relationship between;
-Concentration of a Substance in a LiquidSolution (c)
-number of moles of the substance (n)
-Volume of the Liquid Solution (V)
c =n / V ;
-c: mol.dm^-3 OR M
-n: mol
-V: dm3 OR 10^-3 m3
What is the Relationship between;
-Number of Molecules (N)
-Number of Moles (n)
-Avagadro Constant (L)
N = n.L ;
-N: Unitless
-n: mol
-L: mol^-1
What are Strong Acids?
Strong Acids are substances that release Hydrogen Ions (H+) in an Aqueous Medium by Full Ionisation
What are Weak Acids?
Weak Acids are substances that release Hydrogen Ions(H+) in an Aqueous Medium by Partial Ionisation
Is Hydrochloric Acid Strong or Weak?
HCl is a Strong Acid
Is Sulphuric Acid Strong or Weak?
H2SO4 is a Strong Acid
