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Science unit 3

Terms in this set (27)

Matter
Anything that has mass and takes up space
Mass
the amount of matter in an object
Gas
A state of matter with no definite shape or volume
liquid
A state of matter that has no definite shape but has a definite volume.
Solids
Definite shape and volume
Characteristics
A distinguishing feature or quality
non-characteristic
A trait which is able to ONLY DESCRIBE a substance
-Ex: Color, texture, mass
Solubility
A measure of how much solute can dissolve in a given solvent at a given temperature.
Solution
A homogeneous mixture of two or more substances
Solute
A substance that is dissolved in a solution.
Density
the degree of compactness of a substance.
Salinity
the amount of salt in water
Atom
Basic unit of matter
Molecule
A group of atoms bonded together
Compound
A substance made up of atoms of two or more different elements joined by chemical bonds
Ion
A charged atom
What are 3 factors that determaine how fast a solid dissolves in water
Temperature-movement-surface area
polar
having a pair of equal and opposite charges
Non-polar
equal sharing of electrons
pH
hydrogen ion concentration
pH scale
measurement system used to indicate the concentration of hydrogen ions (H+) in solution; ranges from 0 to 14
What are characteristics of acids
They taste sour, and conducts electricity
What is a base?
A substance with a pH greater than 7
What are characteristics of bases
They taste bitter, and are often cleaners.
What is the Law of conservation of matter
matter cannot be created or destroyed
physical change
A change in a substance that does not change its identity
chemical change
A change in matter that produces one or more new substances
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