Temperature and Pressure
What 2 units measure pressure?
Pascals (Pa) and Atmosphere (atm)
How are molecules packed in a solid?
molecules are packed tightly and do not move much space between them
_______ is anything that has a mass and occupies space
Matter is anything that has a mass and occupies space
The transformation of a solid into a liquid is called?
Melting
Change of state graphs are used to tell us about the exact density of a substance. True or false
FALSE! Change state graphs do not tell us anything about density
What three units measure Temperature?
What kind of volume does a solid have? Constant or Variable?
Solids have a constant volume
What tools do we use to measure mass
Balances or Scales
Clothes are left out to dry is an example of
Clothes are left out to dry is an example of evaporation
What do the slanted lines indicate on a change of state graph?
The slanted lines indicate a temperature change
The higher the temperature the _________ (faster or slower) the motion of particles are
The higher the temperature the faster the motion of particles is
What kind of shape does a liquid have? Constant or variable
Liquids have a variable shape
What is the formula for density
Density = Mass/Volume
D= M/ V
Frost forming on a window on a cold day is an example of
Reverse sublimation or deposition
What do the horizontal lines indicate on a change of state graph?
At what Celsius temperature does water boil?
Water boils at 100 degrees Celsius
What type of matter has no volume of its own?
Gases have no volume of their own
_______ is a measure of the space occupied by a body. Measured using cubic metres m3
VOLUME is a measure of the space occupied by a body. Measured using cubic metres m^3
Heat is added during sublimation
What is represented on a change of state graph
a change of state graph tells us the relationship between length of time, temperature, and state of substance
Convert 50 degrees celsius to Kelvins
50 degrees celsius is 323K
50+ 273
What type of matter has a fixed volume but not their own shape?
Liquids have a fixed volume but not their own shape
What is the formula for a sphere?
V= 4/3pi x r2
What is the difference between evaporation and boiling?
On a heating curve for water, which phase change requires more energy: melting (solid to liquid) or boiling (liquid to gas)? How can you tell from the graph?
Boiling requires more energy, as shown by a longer flat section at the boiling point compared to the melting point.