Theories
What is chemistry?
Chemistry is the study of matter and its changes.
What is the number of electrons and neutrons of a bromine ion?, if:
A=80
p=35
charge is=-1
Neutrons: 45
Electrons: 36
What is the formula of acetate anion?
CH3COO
Complete the reaction and balance the equations:
HBr+H2SO4=2HBr + H2SO4 = Br2 + SO2 + 2H2O
Types of formulas
1. Empirical formula
2. Molecular formula
3. Structural formula
What do we call vaporisation?
Liquid to gas.
Write the electron configuration of In (Indium)?
In:[Kr]4d105s25p1
What is the formula of laughing gas?
N2O - nitrous oxide
Two compounds are combined and switch partners
Double displacement
What is Isotope
Same protons different neutrons
What is homogeneous mixture?
If we cannot see what the mixture consists of then it will be homogeneous mixture.
What is the number of moles of 112L chlorine (Cl2) gas at STP?
n=5mol.
Br2O5
Dibromine pentoxide
Cu+AgNO3=
Cu+AgNO3=CuNO3+Ag
Name the following compound:
Na2CrO4
Sodium chromate
What is an atom made of?
Nucleus and electrons.
Element X has 3 isotopes: 20X-50%; 21X-25%; 19X-25%. What is the average atomic mass of X?
20
Formula of silicon dioxide
SiO2
Cu(OH)2+HC2H3O2=
Cu(OH)2+2HC2H3O2=CuC2H3O2+2H2O
What is Avogadro’s number and number of volume at STP?
Avogadro’s number: 6.02*1023
Number of volume at STP: 22.4
What is formula?
A formula is a combination of symbols and numbers that represents compounds.
What is the number of moles of 3.01*1022 atoms of helium (He)?
PbCrO4
Lead(ıı)chromate
Silver nitrate + Zinc chloride -> Silver chloride + zinc nitrate
2AgNO3+ZnCl2=2AgCl+Zn(NO3)2
Who was D.I.Mendeleev?
He was a chemist who created the periodic table of elements.