Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
its density decreases
it solidifies
its temperature decreases
its temperature increases
its temperature remains unchanged
Correct answer is D
Compressed air is a gas, or a combination of gases, that has been put under greater pressure than the air in the general environment.
When you pressurize a gas by compressing it into a container, you're putting all those molecules into a smaller volume of space and you're adding potential energy by the compression.
Gay Lussac's Law - states that the pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature.
If an organic compound decolorizes bromine water then the compound is?
saturated
supersaturated
unsaturated
a solid
protonated
Correct answer is C
No explanation has been provided for this answer.
When sodium nitrate dissolves in water, ∆H is positive. This means that?
the reaction is catalysed
the reaction is complete
the reaction is exothermic
the reaction is endthermic
sodium nitrate is highly soluble in water
Correct answer is D
No explanation has been provided for this answer.
44.8 dm3
11.2 dm3
100.1 dm3
3.0 dm3
22.4 dm3
Correct answer is B
Na2CO3 + 2HCI → 2NaCI +H2O + CO2
53 gm Na2CO3 will therefore liberate (22.4)/(106) x (53)/(1) = 11.2 dm3
5 cm3
25 cm3
50 cm3
75 cm3
100 cm3
Correct answer is D
2H2 + O2 → 2H2O
2V3 1V3 2V
50cm 100 —
50cm 25cm3 50cm3
Volume of gas left = (100 - 25)cm3 of O2 = 75 cm3 of O2