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Worksheets1.6 Changes of state-melting and freezing
Total questions: 23
Worksheet time: 12mins
What is the change of state from solid to liquid called?
Evaporation
Melting
Condensation
Sublimation
What happens to the particles when a solid begins to melt?
They stop moving
They move out of their fixed positions
They become smaller
They disappear
What is the temperature at which a substance melts called?
Condensation point
Boiling point
Freezing point
Melting point
What happens to the particles when a liquid freezes?
They start moving.
They become smaller.
They arrange themselves in a pattern.
They move faster.
What is true for all changes of state?
Total number of particles are increased or decreased.
Particles move at the same speed.
Particles themselves change.
Particles do not change.
When a solid melts Its particles ........................ energy.
lose
gain
When a solid melts the particles overcome the attraction force and start to move around, in and out of each other.
True
False
Every substance has its own melting point.
True
False
Melting points are used to Identify substances.
True
False
The change of state from liquid to solid is called ...............
melting
freezing
boiling
When a liquid freezes its particles ........ energy .
lose
gain
When a liquid freezes its particles gain energy and start moving around from place to place.
True
False
The temperature at which a substance freezes is its ..................................
freezing point
sublimation point
boiling point
At what temperature in degrees Celsius does water freeze?
150
0
200
32
Solid can change into a liquid when it's .......
cooled
burned
heated
freezed
A substance has a melting point of 25 oC and a boiling point of 235 oC. What state is it at 5oC?
Solid
Liquid
Gas
If the temperature is above the melting point of a substance and above the boiling point of a substance what state will it be in?
Solid
Liquid
Gas
A substance has a melting point of -125 oC and a boiling point of -35 oC. What state is it at 15oC?
Solid
Liquid
Gas
A substance has a melting point of -25 oC and a boiling point of 35 oC. What state is it at 25oC?
Solid
Liquid
Gas
If a substance melts at -107 and boils at -103, what state will it be at room temperature?
solid
liquid
gas
The weaker the intermolecular forces of a substance the _____________ the boiling point
higher
lower
