The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 114
... substances hydrogen and oxygen ; these two substances , however , are elements because they cannot be decomposed into simpler sub- stances by any known chemical process . Most samples of naturally occurring matter are physical mixtures ...
... substances hydrogen and oxygen ; these two substances , however , are elements because they cannot be decomposed into simpler sub- stances by any known chemical process . Most samples of naturally occurring matter are physical mixtures ...
Page 166
... substance but a complex array of many substances . Even a single fibre of wood is a com- plex system of many compounds . The number of sub- stances possible is almost without limit . A few common substances are water ( H2O ) ; octane ...
... substance but a complex array of many substances . Even a single fibre of wood is a com- plex system of many compounds . The number of sub- stances possible is almost without limit . A few common substances are water ( H2O ) ; octane ...
Page 171
... substances and that these substances have marked differences in melting points , vapour pressures ( volatilities ) , or solubilities . When the mixture contains substances having closely similar prop- erties , the problem becomes more ...
... substances and that these substances have marked differences in melting points , vapour pressures ( volatilities ) , or solubilities . When the mixture contains substances having closely similar prop- erties , the problem becomes more ...
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acid activity addition administration appear atoms became become bonds called carbon cause central centre century charge Charles chemical chemistry Chess China Chinese combined common complete compounds containing continued cultural drugs early economic effect electrons elements energy established example Figure forces four give given groups hydrogen important increased industry involved ions Italy king known land later less literature living major mass materials ment metal methods molecular molecules move natural occur officials orbitals organic original party percent period play political population position possible present properties provinces reaction region remained represented result river rule separation social species structure substances successful temperature tion types United usually various