Calcium oxide (CaO)
Sodium oxide (Na2O)
Copper (ll) oxide (CuO)
Tri-iron tetroxide (Fe3O4)
Aluminium oxide (Al2O3)
Correct answer is D
No explanation has been provided for this answer.
CO2 and NH3
CO and NH3
SO2 and H2O
CO2 and H2O
SO2 and NH3
Correct answer is D
All saturated hydrocarbons are attacked by oxygen at elevated temperatures and, if oxygen is in excess, complete combustion to carbon dioxide and water occurs.
an alkene
an alkane
an alkyne
tetrachloromethane
dichloromethane
Correct answer is B
Burning the alkane in the presence of sufficient air or oxygen; it produces carbon dioxide, water, and a huge amount of heat as a product.
If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white.
Anhydrous CuSO4 is used to test the presence of water in any liquid because it changes its colour from white to blue in the presence of water.
Which of the following substances is the most abundant in the universe?
Carbon
Air
Water
Oxygen
Hydrogen
Correct answer is E
Element Abundance
Hydrogen 40,000
Helium 3,100
Oxygen 22
Neon 8.6
Nitrogen 6.6
Carbon 3.5
Silicon 1
Magnesium 0.91
Iron 0.6
Sulfur 0.38
NaOH.H2O
NaOH.N2
Na2CO3O
NaHCO3
NaNO3O
Correct answer is C
No explanation has been provided for this answer.