Maryhopes chem flash cards ch1

Law of conservation
The total mass remains the same during a chemical change
Example of law of conservation
Mercury and oxygen creates mercury oxide
Differences in states of matter
How tightly the particles are packed together
Example:
Molecules in a liquid are very loosely packed together and a solid particles are very tightly packed
Example of liquid
Water
Example of solid
Ice
Example of gas
Water vapor
Physical property
A characteristic that can be observed for a material without changing its chemIcal identity
Examples of physical property
Color
Density
Chemical property
A characteristic of a material involving its chemical change
Examples of chemical property
Heat combustion
Reactivity
PH factor
Physical change
A change in the form of matter but not in its chemical identity
Examples of a physical change
Melting an ice cube
Crumbling a paper
Breaking a bottle
Chemical change
A change in which one or ore kinds of matter are transformed into new matter or several kinds of new matter
Examples of a chemical change
Burning something
Rusting of iron
Elements
A substance that cannot be decomposed by any chemical reaction into simpler substances
Examples of elements
Gold
Iron
Silver
Compound
A substance so posed of two or more elements chemically combined
Examples of compounds
Sodium chloride
Water (h2o)
Carbondale dioxide (co2)
Mixtures
A material that can be separated by physical means into two or more substances
Examples of mixtures
Salt water
Salad dressing
Two types of mixtures
Homogenous and heterogeneous
Heterogenous mixture
A mixture that consists of physically distinct parts each with differ properties
Homogenous mixture
A mixture that is uniform in its properties throughout given samples
Intensive property
Properties that do not depend on the amount of substance that’s present
Examples of intensive properties
Boiling point
Density
State of matter
Extensive property
Properties that DO depend on the amount of substance present
Examples of extensive properties
Volume
Mass
Size
Chromatography
A group of similar separation techniques
Types of chromatography
Paper
Column
Gas
Pure substance
A sample of matter with both definte and constant combustion with distinct chemical properties
Impure substance
A sample of matter without definite and constant combustion with distinct chemical properties
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