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.
A consequences of global warming is
Air pollution
Flooding
Increased humidity
Water pollution
Correct answer is B
Global warming is a gradual increase in the earth’s temperature generally due to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants., consequences of global warming include: Seasonal/climate change, Rising oceans, Increase in flooding occurrences. Melting ice caps or polar ice. Increase in the average temperature of the world.
Which of the following sources of energy contributes to green-house effect?
Natural gas
Nuclear
Wind
Solar
Correct answer is A
No explanation has been provided for this answer.
64.2dm3
33.6dm3
11.2dm3
3.73dm3
Correct answer is B
C2H4(g) + 3O2(g) \(\to\) 2CO2(g) + 2H2O(l)
1 mole of ethene required 3 moles of O2
28g of ethene required 3 x 22.4dm3 of O2
14g will require \(\frac{14 \times 3 \times 22.4dm^3}{28}\)
= 33.6dm3
I only
II only
I and III only
II and III only
Correct answer is B
No explanation has been provided for this answer.
The compound that makes palm wine taste sour after exposure to the air for few days is
Ethanol
Ethanoic acid
Methanol
Methanoic acid
Correct answer is A
The ethanol (alcohol content) of the wine, is oxidized, by the oxygen in the air into ethanoic acid.
Ripening of fruits is hastened by using
Ethanol
Ethane
Ethene
Ethyne
Correct answer is C
No explanation has been provided for this answer.
Amino acids are obtained from proteins by
Hydrolysis
Oxidation
Polymerization
Reduction
Correct answer is A
No explanation has been provided for this answer.
Al(s) + Cu2+(aq) \(\to\) Al3+(aq) + Cu(s)
2Al(s) + Cu2+(aq) \(\to\) 2Al(aq) + Cu(s)
2Al(s) + 3Cu2+(aq) \(\to\) 3Cu(s) + 2Al3+(aq)
3Al(s) + 2Cu2+(aq) \(\to\) Cu(s) + 3Al3+(aq)
Correct answer is C
Al(s) \(\to\) Al3+(aq) + 3e- ______(i)
Cu2+(aq) + 2e- \(\to\) Cu(s) ________(ii)
To balance the electrons, multiply equation (i) by 2 and equation (ii) by 3 and then add the resulting equations
2Al(s) \(\to\)2Al3+(aq) + 3e-
3cu2+(aq) + 6e- \(\to\)3Cu(s)
2Al(s) + 3Cu2+(aq) \(\to\) 3Cu(s) + 2Al3+(aq)
7
6
3
2
Correct answer is B
No explanation has been provided for this answer.
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