It is difficult to achieve an orderly arrangement of the molecules of a gas because they?
have no definite shape
have little force of attraction between them
can collide with one another in the container
are too small in size
Correct answer is B
In most cases, there are essentially no attractive forces between particles. This means that a gas has nothing to hold a specific shape or volume.
According to charles' law, the volume of a gas becomes zero at
0 oC
-100 oC
-273 oC
-373 oC
Correct answer is C
No explanation has been provided for this answer.
112 cm2
224 cm2
448 cm2
2240 cm2
Correct answer is C
CaCO3(s) + 2HCl(aq) → CaCl2 + H2O(l) + CO2
The relative molecular mass of CaCO3 = 40 + 12 + 16 * 3 = 52 +48 = 100 ;
Relative molecular mass of CO2 = 12 + 10 * 2 = 44
From the above equation, 100g of CaCO3reacts with 44g of CO2 at s.t.p. i.e 22.4 dm3
2g of CaCO3 will react with (2*22.4)/100 of CO2 = 0.448 dm3
0.448 dm3 = 0.448 * 1000 = 448cm3
0.8g
4.0g
40.0g
80.0g
Correct answer is B
Equation of the reaction
H2SO4(g) + CuO(s) → Cu4(aq) + H2O
Relative molecular mass of H2SO4 = 1 + 2 + 32 + 16 + 4 = 98
Relative molecular mass of CuO = 64 + 16 =80
From the above equation, 98s of H2SO4 reacts with 80s of CuO.
∴ 4.9g of H2SO4 will react with
= (4.9 * 80)/98 of CuO = 392/98 = 4.0g
A chemical reaction is always associated with
an increase in the composition of one of the substance
a change in the volume of the reactants
a change in the nature of the reactants
the formation of new substance
Correct answer is D
No explanation has been provided for this answer.