Science unit 3 lesson 2 Flashcards
What are some examples of matter changing states in every day life? List at least three.
Ice into water, water into steam, rocks and lava, water vapor condensing into dew droplets. 
What is the boiling point of water in degree C?
100° C
What is the melting point of water in degrees C?
0° C
What is the freezing point of water in degree C?
0° C
What is the condensation point of water in degree C?
100° C
What pattern do you notice in questions 5–8 above?
The boiling point and the condensation point are the same. The melting point in the freezing point are the same. Solid to liquid is melting. liquid to solid is freezing. Liquid to gas is boiling. Gas to liquid is condensation. 
What is condensation?
The change of state from a gas to a liquid.
What is vaporization?
The change of state from a liquid to a gas.
How are condensation and vaporization related to the water cycle?
Liquid water on the ground, turns into gas and enters the atmosphere. (Vaporization) Water vapor in the atmosphere condenses and forms clouds. (Condensation) When the clouds get too heavy, they fall back down to the earth as liquid water drops – – rain! (Precipitation)
What causes dew on grass in the morning?
Temperature drops overnight causes condensation of gases, atmospheric water into liquid water, which forms little beads on the grass 
Do all substances have the same melting and boiling points? Why?
No. Because different elements of the periodic table are attracted to each other (and other substances) at different degrees/temperatures. Some bonds are easier to break than others, so some substances boil at lower temperatures and others.
If thermal energy and kinetic energy are very similar, what then would their opposite be?
There is a pool of energy, and kinetic energy and potential energy are inversely proportional. 
Which state of water has the most potential energy and why?
Solid: ice. Because it has the least amount of motion, since it has the least amount of kinetic energy.
Which state of water has the most kinetic energy and why?
Gas: gaseous Water molecules, move the most because they have the most energy.
