Among the following identify the information which are conveyed by chemical equations ?
Relative masses
Heat changes
Concentration
Time factor
Among the following identify the information which are not conveyed by chemical equations ?
Isotopes
Number of moles
a and c
2 SO2 + O2 → :
2 SO4
2 SO3
SO4
2 SO
What are the charged particles formed by the transfer of electrons from one element to another element ?
Molecules
Atom
Ions
Metals
Atomic number of sodium is 11. Then the number of electrons in sodium ion is :
10
11
9
12
Valency of pottassium is 1. valency of chlorine is 1. Write the formula of pottassium chloride ?
KCl
K1Cl1
KCl-
2 KCl
Formula of Alumminium oxide is Al2O3. What is the valency of Alumminium ?
2
1
3
4
Pick out the correct chemical formula of sodium nitrate ?
Na2CO3
NaNO3
2 NaCO3
Na2(CO3)2
Metals usually form:
Cations
Anions
Radicals
Polyvalent anion
Fe + Cl2 → FeCl3 . How can we balance Cl atom ?
2 Fe + 3 Cl2 → FeCl3
Fe2 + Cl2 → FeCl3
2 Fe + Cl → 2 FeCl
Fe + 3 Cl2 → 2 FeCl3