A) Ethene B) Sulphur C) Hydrogen D) Methane
A) Pentane B) Propane C) Benzene D) Hexane
A) oxidation B) sublimation C) decomposition D) reduction
A) filling the orbitals with lower energy first B) the filling of degenerated orbitals C) quantum numbers of electrons D) quantity of electrons in the valence shell
A) nitrogen is less dense than oxygen B) oxygen is more reactive than nitrogen C) of the difference in their boiling points D) they belong to the same period
A) 2.00gdm−3 B) 80.00gdm−3 C) 8.00gdm−3 D) 0.08gdm−3
A) hydrogen atoms in its aqueous solution B) double anions in its aqueous solution C) a single cation in its aqueous solution D) hydrogen ions in its aqueous solution
A) bond forming energy exceeds bond breaking energy B) heat of formation of reactants exceeds heat of formation of products C) enthalpy change is negative D) reaction vessel feels cool during the reaction
A) HCl B) CH4 C) NH3 D) NaH
A) C3H6 B) C3H4 C) C2H4 D) C4H8
A) 80.0g B) 76.0g C) 66.0g D) 96.0g
A) nuclear charge decreases while the distance of the valence shell from the nucleus is increasing B) nuclear charge decreases while the outermost electrons are drawn closer to the nucleus C) nuclear charge increases while the outermost electrons are drawn closer to the nucleus D) valence electrons increase across the period while the valence shell remains constant
A) +3 B) +5 C) +4 D) +2
A) Al B) Na C) K D) Mg
A) screening effect of the inner electron(s) B) size of the positive nuclear charge C) ability to attract shared electron(s) D) distance of the outermost electron(s) from the nucleus
A) Covalent compounds would readily ionize in solution B) Hydrogen bond is formed between a metal and a non-metal C) Ionic compounds in solution would conduct electricity D) Covalent compounds consist of ions
A) octahedral shape B) hardness C) durability D) high melting point
A) Activation energy is high B) A catalyst is required C) Heat energy is absorbed D) It occurs reversibly
A) 100.00 B) 0.01 C) 10.00 D) 1000.00
A) have octahedral shape B) conduct electricity C) have same density D) form carbon(IV) oxide on combustion
A) a reducing agent B) a base C) an oxidizing agent D) an acid
A) ozonolysis B) dehydration C) hydrolysis D) decomposition
A) 0.490g B) 0.049g C) 0.245g D) 0.0245g
A) reducing its quantity B) increasing the external pressure C) decreasing the external pressure D) distilling it
A) 40°C B) 30°C C) 0°C D) 20°C
A) precipitates and the solution remains unchanged B) dissolves and the solution becomes unsaturated C) dissolves and crystals are formed D) dissolves and the solution becomes super saturated
A) propanol B) propanoic acid C) propyne D) propane
A) mechanism of electrolysis B) nature of the electrode C) electrolytic reactions D) electrolytic reactions
A) 2s orbital B) 1s orbital C) 2px D) 3s orbital
A) carbon(IV) oxide B) fire blanket C) water D) sand
A) Formation of salt and hydrogen gas with reactive metals B) Evolution of carbon dioxide gas when added to a trioxocarbonate (IV) salt C) Formation of salt and water with alkalis D) Evolution of ammonia when heated with ammonium salts |