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17 Cards in this Set
- Front
- Back
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Ex. of chemistry |
Use of formic acid by ants and pheromones |
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Matter |
anything that has mass and occupies space |
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compound |
-compose of two or more elements in a fix ratio -has different characteristics than its elements |
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What are the elements of life? |
CHON - 96% |
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Trace elements |
Need in small amount, but essential to life -Ca,P,K,S,Na,Cl,Mg |
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atom |
the smallest unit of matter that still retains the properties of an element |
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radioactive isotopes |
decay spontaneously giving off particles and energy |
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Energy |
the capacity to cause change |
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potential energy |
the energy that matter has because of its location or structure |
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electron shell |
stage of potential energy |
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Valence electrons |
electrons in the outermost shell |
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Covalent bonds |
the sharing of valence electrons by two atoms |
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molecule |
consists of two or more atoms held together by covalent bonds |
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double covalent |
sharing of two pairs of valence electrons |
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Electronegativity |
an atom’s attraction for the electrons in a covalent bond |
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Name the types of chemical bonds |
1.Covalent 2.Ionic 3.Hydrogen 4.Vander Waal's |
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Where does hydrogen bonds occur |
In polar covalent bond |
