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(distinguish elements and compounds (A compound contains atoms of…
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matter and change
Changing States of Matter. Molecules can move from one physical state to another (phase change) and not change their basic structure. Oxygen (O2) as a gas has the same chemical properties as liquid oxygen. The liquid state is colder and denser, but the molecules (the basic parts) are still the same.
solid liquid and gas
gas are well separated with no regular arrangement.
liquid are close together with no regular arrangement.
solid are tightly packed, usually in a regular pattern.
atomic sequence
An atomic sequence can be used wherever a Promela statement can be used. The first statement of the sequence is called its guard because it determines when the sequence can be started.
heterogeneous
of or denoting a process involving substances in different phases (solid, liquid, or gaseous).
element def
each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e., the number of protons in the nuclei of its atoms.
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chemical change
Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
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reactants and product
All chemical reactions—including a candle burning—involve reactants and products. Reactants are substances that start a chemical reaction. Products are substances that are produced in the reaction.
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