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Chpt 9 Les.3 Science

Most matter can be found in what 3 states? solid, liquid, gas
What is the measure of the average amount of kinetic energy of the atoms/molecules in a material? temperature
Temperature measures what type of energy? kinetic energy
Where is the kinetic energy that is measured as temperature found? in the atom/molecules in the materia;
What is needed to change a state of matter? energy
When a substance goes from a solid to a liquid to a gas what must the substance do with the energy to make this happen? it must absorb the energy (energy is added)
To make a substance go from a gas to a liquid to a solid what happens to the energy? the energy is removed
When energy is removed what 3 things happen? 1. the substance cools 2.molecules slow down 3. molecules move closer together
Name the fourth state of matter. plasma
What happens to the energy in the state of plasma? there is so much energy that all of the electrons have separated from the nuclei of the atom
What is the temperature like during the state of plasma? very high temperature
Changing from a gas to a liquid as heat is removed and the particles lose energy and slow down...what are you called? condensation
How are a substance's melting point and freezing point related? they are at the same temperature
What is at the same temperature for a substance? melting point and freezing point
What 2 things do most substances do when they freeze? !. shrink and 2. take up a smaller volume
What substance behaves differently when it freezes? water
What does water do when it freezes? 1. expands and 2. takes up more volume
Water changes from ______ to _______ when it freezes. liquid to a solid
What occurs when a liquid reaches a temperature at which bubbles of gas form rapidly throughout the liquid? boiling
Boiling occurs when a liquid reaches a temperature at which bubble of _______ form rapidly throughout the liquid. gas
What happens on the surface of a liquid at any temperature below the boiling point? evaporation
True or false Molecules at the surface of a liquid have enough energy to escape? true (they escape through evaporation)
When you increase pressure on a gas what happens to the volume? it decreases the volume
How can you decrease the volume of a gas? increase the pressure
Why does increasing pressure on a gas decrease the volume? The space between the molecules decrease and the air inside the balloon has a smaller volume.
What happens to gas when it is cooled? it contracts
What happens to gas when it is heated? it expands
For gas, as temperature decreases, the volume____________________. decreases
For gas, as the temperature increases, the volume _______________. increases
When you change the size, shape, or state of matter of a substance without forming a new substance this is called what? physical change
What is the process that occurs when the molecules of a solid move apart and are separated by the molecules of a liquid? dissolving
What speeds up the process of dissolving? heat
In dissolving, heat causes different molecules to move around faster so they can ______more rapidly. mix
Created by: douglastmo