Changes of State
What is it called when a liquid changes to a solid?
freezing
What is another name for particle theory?
SPAM
What state of matter has the weakest attraction?
Gases
As the gas heats up it will eventually explode.
What is matter?
What is it called when a gas changes to a liquid?
evaporation
Explain the S in SPAM
Space- All particles have spaces between them. The amount of space depends on the state of matter.
What state of matter has a fixed shape and volume?
Solids
How did thermal expansion affect the Dusable Bridge
It got hot one day, causing the steel to expand so the bridge couldn't open. The city hosed it down with water to make the metal contract again.
What needs to be added or removed from matter to make is change state?
We need to add or take away heat.
What is it called when a solid changes to a gas?
Sublimation
Explain the P in SPAM
P- All matter is made up of tiny particles named atoms
What is density?
How tightly packed the particles in matter are.
How does a thermometer work?
The mercury in a thermometer expands in heat making it go higher to show temperature. It contracts when heat is removed making it show a lower temperature?
How does the sun affect evaporation?
The sun is a source of heat so it makes things evaporate faster.
What is it called when a liquid changes to a gas?
Evaporation
Explain A in SPAM
A- attract. All matter particles are attracted to one another. The level of attraction depends on the type of matter.
What will happen if a solid is more dense than the liquid you put it in?
It will sink
Give one example of thermal expansion in solids discussed in class and explain how it works.
Glass
Door sticking
Railway tracks/Metal
When matter changes state the amount of space it takes up changes but the mass stays the same why?
Because there is no matter being created or destroyed. It is simply just changing the way the matter looks.
What is it called when a gas changes to a solid?
Deposition
Explain the M in SPAM
M- all particles are always in motion. The amount of movement depends on the state of matter and whether heat is added or removed.
How does the density of water (frozen and liquid) differ from density of other substances?
In most substances solids are more dense than liquids. However, for water ice is actually less dense than liquid water which is why it floats.
Why do we use salt on icy roads in the winter?
Because salt lowers the melting point of ice which makes it melt at a lower temperature?
What are the boiling, melting, and freezing points of water?
Freezing/Melting- 0 degrees Celsius
Boiling- 100 degrees Celsius