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Apologia Chem M 6A

Apologia Chemistry M6A: Changes in Matter and Chemical reactions

QuestionAnswer
chemical change a change that affects the TYPE of molecules or atoms in a substance
physical change a change in which the ATOMS or molecules in a substance stay the SAME
element when ATOMS of the same type are collected
compounds when MOLECULES of the same type are collected
example of a chemical change burning a piece of paper
example of a physical change ripping a sheet of paper in half
DISSOLVING an element or compound is an example of a PHYSICAL change because it does not affect the TYPE of atoms or molecules.
A phase change is when a substance CHANGES from one STATE to another; all that is required is energy.
The kinetic theory of matter states that atoms or molecules that make up a substance are in constant motion; the higher their temperature, the greater their speed.
The main difference between phases of matter is the volume they occupy.
Most substances take up the least amount of volume in their ______________ phase. solid
Most substances take up the LARGEST amount of volume in their __________ phase. gas
Motion requires work.
Work requires energy.
The HIGHER the temperature of the surroundings, the FASTER the molecules move around.
melting point temperature at which a substance changes from solid to liquid
boiling point temperature at which a substance changes from liquid phase to gas phase
condensing phase change from gas to liquid, requires that energy be removed
freezing phase change from liquid to solid, requires that energy be removed
density an object's mass divided by the volume that the object occupies
________________ is a very important quantity in chemistry because it gives an idea of how TIGHTLY packed matter is in an object. Density
To QUALITATIVELY determine something is to OBSERVE it.
To QUANTITATIVELY determine something is to MEASURE it.
Water is an exception to the phase change rule because solid water occupies ___________ volume than liquid water & it STAYS a liquid at room temperature. MORE
All substances that are chemically similar to water are GASES at room temperature.
Created by: MrsHough
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