Flashcards
Sem título
Flashcards do conjunto (19)
- 1atomthe basic unit of a chemical element
- 2elementa pure substance that cannot be broken down into simpler substances (p. 184)
- 3moleculea particle in which atoms are joined by covalent bonds (p. 207)
- 4compounda pure substance composed of two or more elements in a fixed ratio (p. 186)
- 5chemical formulaa representation of compounds using element symbols and ratios
- 6pure substancematter that has one phase throughout
- 7mixturematter that contains two or more substances which can be separated through physical means
- 8solutiona mixture that has one phase
- 9what is the difference between physical and chemical changes?in a chemical change, new substances are formed whereas a physical change does not form new substances.
- 10what is an example of a chemical change?new colours, heat/ light being produced/ absorbed, bubbles of gas being formed, precipitate being formed, difficult to reverse
- 11what is an example of a physical change?melting, evaporation, condensation, sublimation, dissolving
- 12what is the difference between a physical property and a chemical one?they are both descriptions of a substance, but a physical property will not involve forming a new substance while a chemical property describes what the substance does when it changes into one or more new substances.
- 13what are examples of physical properties?colour, texture, density, smell, solubility, taste, melting point, physical state
- 14what are examples of chemical properties?reaction of an acid with a base, flammability, bleaching ability, corrosion.
- 15what is this calledstandard atomic notation
- 16what is the atomic number?9
- 17what is the mass number19
- 18what is the atomic number of an element tell usthe number of protons
also the number of electrons - 19what does the mass number of an element tell usthe number of protons and neutrons
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- FlashCards sobre Sem título, criado por melurvunicorns em 18-11-2015.
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- melurvunicorns · nov 2015
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- 19 fev 2016
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