50cm3
35cm3
30cm3
25cm3
Correct answer is B
2H\(_2\)(g) + O\(_2\)(g) → 2H\(_2\)O(g).
2 volumes of H\(_2\)(g) and 1 volume of O\(_2\)(g) produced 2 volumes of H\(_2\)O\(_2\)
ratio of reacting volumes
30cm\(^3\) + 15cm\(^3\) → 30cm\(^3\)
30cm\(^3\) of Hydrogen requires 15cm\(^3\) of oxygen to produce 30cm\(^3\) of water.
Excess oxygen: 20cm\(^3\) – 15cm\(^3\) = 5cm\(^3\)
Total volume of gaseous mixture: 5cm\(^3\) of Oxygen + 30cm\(^3\) of Water = 35cm\(^3\)
Helium is preferred to hydrogen in filling balloons because hydrogen
is inflammable
is diatomic
exhibits isotopy
is a component of water
Correct answer is A
Helium is a colorless, non-toxic, non-flammable gas that is lighter than air. When balloons are filled with helium, they will float.
0.040dm 3
0.896dm 3
5.82dm 3
8.62dm 3
Correct answer is B
Zn + 2HCI → ZnCI2 + H2; 65g of Zn produces 22.4 dm3 of H2; .: 2.6g of Zn will produce = 2.6/65 x 22.4 = 0.896 dm3
Gas molecules are said to be perfectly elastic because
they collide without loss of energy
they move about in straight lines
the distances between them are negligible
the volume occupied by them is negligible
Correct answer is A
No explanation has been provided for this answer.
Equal volumes of CO2 cnd CO at s.t.p have the same
mass
density
rate of diffusion
number of molecules
Correct answer is D
No explanation has been provided for this answer.