The negatively charged particle in an atom is the
Electron
Neutron
Positron
Proton
Correct answer is A
No explanation has been provided for this answer.
Which of the following metals is common to both brass and bronze?
Aluminium
Copper
Lead
Iron
Correct answer is B
No explanation has been provided for this answer.
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