Answer: Option (c) is the correct answer.
Explanation:
Water cycle is a process in which water circulates from point to another into the atmosphere. This means that water in the form of rain falls on the ground and then through the process of evaporation it reaches back to the atmosphere and clouds.
Energy from the Sun is highly responsible for carrying out the process of water cycle. This is because when water falls on from clouds it seeps through rivers, mountains, lakes etc into the oceans and then heat energy from the sun evaporates this water and it rises to make clouds and help in rainfall and snow.
Therefore, we can conclude that energy from the Sun is the most responsible force driving the water cycle.
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.
Answer: The freezing-point depression constant (Kf) of nitrobenzene is
Explanation:
Depression in freezing point is given by:
= Depression in freezing point
i= vant hoff factor = 1 (for non electrolyte nitrobenzene)
= freezing point constant = ?
m= molality
Weight of solvent = 20 g = 0.02 kg
mass of solute (ethanol) = 1.0 g
Molar mass of ethanol = 46 g/mol
Thus freezing-point depression constant (Kf) of nitrobenzene is
Answer:
88%.
Explanation:
The percentage yield of lead sulfate in this experiment is 88% if 2.53 is divided by 2.85 and multiply by 100. The percentage yield can be calculated when the experimental yield is divided by theoretical yield and then multiply by 100. The percentage yield tells us about the actual yield that is gained in the end of experiment which is lower than theoretical yield.