Look at the list below. what brought about the following changes in matter?
a. evaporation of a puddle of water
b. melting of an ice cream
c. condensation of water vapour to form dew
d. solidification of volcanic lava
e. burning of a piece of charcoal
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Answers
Answer:
A. Evaporation
B. Heat Conduction.
C. Condensation
D. Eruption
E. Chemical reaction
Explanation:
A. Evaporation happens when a liquid is heated. For example, as the sun heats water in a puddle, the puddle slowly shrinks. The water seems to disappear, but it actually moves into the air as a gas called water vapor. This is an example of evaporation.
B. The ice cream will eventually melt completely, because we know heat naturally flows from warm to cold
C. An example of condensation can be seen when drops of water form on the outside of a glass of ice water. The drops seem to appear from nowhere. However, they actually form from water vapor in the air. The dew that forms on grass overnight is another example of condensation.
Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy and slow down. They move closer to other gas molecules. Finally these molecules collect together to form a liquid.
D. Molten rock is called "magma", "lava" (once it has erupted from a volcano), or simply a "melt". As such a liquid cools down it eventually falls below some threshold temperature and begins to solidify, just as water placed in a freezer eventually turns to ice. The exact nature of the solid can vary depending upon exactly how the melt solidifies
E. Charcoal reacts with oxygen of the air at a glowing red heat to form colourless carbon monoxide gas, which then burns with a blue flame with more oxygen from the air to produce carbon dioxide gas. Due to the heat liberated by both of these reactions, the charcoal reaches a glowing red and radiates heat energy and the hot carbon dioxide gas leaves the combustion zone, hopefully giving up by convection most of its heat by direct physical contact with the cooking pot. The gas temperature falls as it transfers heat and it passes off into the room.
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