What volume of oxygen will remain after reacting 8cm3 of hydrogen with 20cm3 of oxygen?
10 cm3
12 cm3
14 cm3
16 cm3
Correct answer is D
No explanation has been provided for this answer.
3.01 x 1022
6.02 x 1022
3.01 x 1023
6.01 x 1023
Correct answer is B
No explanation has been provided for this answer.
Which of the following is a example of a chemical change?
Dissoultion of salt in water
Rusting of iron
Melting of ice
Separating a mixture by distillation
Correct answer is B
No explanation has been provided for this answer.
Chromatography is used to separate components of mixtures which differ in their rates of?
diffusion
migration
reaction
sedimentaion
Correct answer is B
No explanation has been provided for this answer.
Which of the following reagents will confirm the presence of unsaturation in a compound?
Fehling's solution
Bromine water
Tollen's reagent
Benedict's solution
Correct answer is B
No explanation has been provided for this answer.