Work is done when a force is applid to an object in motion. It is calculated by multiplying the amount force applied to the object and the distance the object travels.
<span>
Work = force x distance
</span><span>Work = 2 N x 20 m
</span><span>Work = 40 Nm
</span><span>
Thus, the answer is the 4th option which is 40 Nm.</span>
Reaction equation:
Zn + 2HCl → ZnCl₂ + H₂
One mole of gas occupies 22.4 L at STP
Moles of H₂ = 112/22.4
= 5 moles
The theoretical amount of Zn needed is 5 mol
The actual amount = 5/0.85
= 5.88 moles
mass = moles x Mr
mass = 5.88 x 65
mass = 382.2 g
The answer is D.
The answer is (3) methyl butane. The isomer means that they have the same chemical formula but different structure. Pentane has five carbon atoms and is alkane. Only methyl butane has five carbon atoms.
Answer:
condensation - B, melting - C, sublimation - A, freezing - D
Explanation:
condensation : condenstaion is process of change of phase of a substance from gaseous to liquid
evaporation : evaporation is process of change of phase of a substance from liquid to gaseous.
melting : melting is process of change of phase of a substance from solid to liquid.
freezing : freezing is process of change of phase of a substance from liquid to solid.
sublimation : sublimation is process of change of phase of a substance from solid to gaseous.