Phase Changes
condensation
Fog in mountain valleys is an example of which phase change? ? (condensation, freezing, melting, vaporization)
gas
If you add enough heat to a liquid, it will normally change into a _____. ? (gas, liquid, solid)
liquid
If you add enough heat to a solid, it will usually change into a _____. ? (gas, liquid, solid)
liquid
If you remove enough heat from a gas, it will usually change into a _____. ? (gas, liquid, solid)
solid
If you remove enough heat from a liquid, it will normally change into a _____. ? (gas, liquid, solid)
false
In the picture, electricity is being used to split liquid water into two new substances (hydrogen and oxygen gases). This is an example of a phase change. ? (true, false)
freezing
Lava cooling into rock is an example of which phase change? ? (condensation, freezing, melting, vaporization)
sublimation
The "special" phase change that happens when a solid changes directly into a gas (skipping the liquid phase) is called _____. ? (deposition, sublimation)
less than
The TIME it takes to boil one teaspoon of water is _____ the TIME it takes to boil one gallon of water. (more than, less than or the same as?)
the same as
The boiling point for one teaspoon of water is _____ the boiling point for one gallon of water. ? (higher than, lower than, the same as)
100
The boiling point of water is _____ degrees Celsius. (0, 32, 100, or 212?)
212
The boiling point of water is _____ degrees Fahrenheit. (0, 32, 100, or 212?)
false
The bubbles seen inside a pot of boiling water are air bubbles being released by the heat. ? (true, false)
melting
The butter on this corn shows an example of which phase change? ? (condensation, freezing, melting, vaporization)
boiling
The specific temperature where a substance changes from a liquid to a gas is a property known as its _____ point. ? (boiling, condensation, freezing, melting)
melting
The specific temperature where a substance changes from a solid to a liquid is a property known as its _____ point. ? (condensation, freezing, melting, vaporization)
gaining
The substance shown in the picture is _____ energy. ? (gaining, losing)
losing
The substance shown in the picture is _____ energy. ? (gaining, losing)
unique
The temperature(s) that a substance changes state are _____ and can be used identify the substance.
boiling
The type of vaporization that happens at high temperatures, very quickly and everywhere in the liquid is called _____. ? (boiling, evaporation)
evaporation
The type of vaporization that happens at low temperatures, slowly and only at the surface of the liquid is called _____. ? (boiling, evaporation)
condensation
The water droplets on this car window are an example of which phase change? ? (condensation, freezing, melting, vaporization)
condensation
The water droplets that form on the outside of the glass of ice water are an example of which phase change? ? (condensation, freezing, melting, vaporization)
sublimation
This dry ice changing directly into a gas in a warm room shows an example of which special phase change? ? (deposition, sublimation)
melting
This ice cream changing to a liquid shows an example of which phase change? ? (condensation, freezing, melting, vaporization)
vaporization
This puddle drying up is an example of which phase change? ? (condensation, freezing, melting, vaporization)
true
Water .vapor is completely invisible. ? (true, false)
vapor
Water in its gas form is called water _____.
vaporization
Wet hair drying is an example of which phase change? ? (condensation, freezing, melting, vaporization)
water
_____ is a common substance that is always changing phases around us - but we often don't notice. ? (air, carbon dioxide, nitrogen, water)
condensation
The "contrail" behind this plane shows an example of which phase change? ? (condensation, freezing, melting, vaporization)
deposition
The "special" phase change that happens when a gas changes directly into a solid (skipping the liquid phase) is called _____. ? (deposition, sublimation)
condensation
A foggy mirror after a hot shower shows an example of which phase change? ? (condensation, freezing, melting, vaporization)
vaporization
A pot of boiling water shows which phase change? ? (condensation, freezing, melting, vaporization)
deposition
A snowflake forming from water vapor in the air is an example of which special phase change? ? (deposition, sublimation)
slower than
Evaporation happens _____ boiling. (slower than, faster than, or the same speed as?)
intensive
Melting and boiling point are _____ physical properties that do NOT change as the amount of the substance increases (or decreases). ? (extensive, intensive)
false
Most substances have the same boiling point. ? (true, false)
deposition
Name the "special" phase change shown in the picture. ? (deposition, sublimation)
condensation
Name the phase change shown in the picture. ? (condensation, freezing, melting, vaporization)
freezing
Name the phase change shown in the picture. ? (condensation, freezing, melting, vaporization)
melting
Name the phase change shown in the picture. ? (condensation, freezing, melting, vaporization)
vaporization
Name the phase change shown in the picture. ? (condensation, freezing, melting, vaporization)
sublimation
Name the special phase change shown in the picture. ? (deposition, sublimation)
physical
Phase changes are _____ changes, because no new substance is formed - the substance only changes its appearance. ? (chemical, physical)
deposition
The frost forming on a car window from water vapor in the air is an example of which special phase change? ? (deposition, sublimation)
condensation
The girl's "foggy" breath on a cold morning shows an example of which phase change? ? (condensation, freezing, melting, vaporization)
freezing
The ice forming on this lake shows an example of which phase change? ? (condensation, freezing, melting, vaporization)
0
The melting point of water is _____ degrees Celsius. (0, 32, 100, or 212?)
32
The melting point of water is _____ degrees Fahrenheit. (0, 32, 100, or 212?)
melting
The metal gallium turns into a liquid from the heat of your hand and shows an example of which phase change? ? (condensation, freezing, melting, vaporization)
condensation
The morning dew on grass shows an example of which phase change? ? (condensation, freezing, melting, vaporization)
condensation
The phase change that happens when a gas becomes a liquid is called _____. ? (condensation, freezing, melting, vaporization)
vaporization
The phase change that happens when a liquid becomes a gas is called _____. ? (condensation, freezing, melting, vaporization)
freezing
The phase change that happens when a liquid becomes a solid is called _____. ? (condensation, freezing, melting, vaporization)
melting
The phase change that happens when a solid becomes a liquid is called _____. ? (condensation, freezing, melting, vaporization)
melting
The pool of hot, liquid wax under the wick of this candle shows an example of which phase change? ? (condensation, freezing, melting, vaporization)
