Chemistry Terms

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Chemistry Terms
2013-06-01 05:27:18
science terms

Chemistry Vocab
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  1. What is matter?
    Anything that takes up space and has mass.
  2. What is a pure substance?
    Matter that contains only one kind of particle.
  3. What is a mixture?
    Matter that contains more than one kind of particle.
  4. What is an element?
    A pure substance that cannot be broken down further by chemical methods.
  5. What is a compound?
    A pure substance made of two or more elements combined chemically.
  6. What is a physical property?
    A characteristic of a substance that can be observed and measured without changing the identity of the substance.
  7. What is viscosity?
    The measure of a substance's resistance to flow.
  8. What is a melting point?
    The temperature at which a solid turns into a liquid.
  9. What is a boiling point?
    The temperature at which a liquid turns into a gas.
  10. What is solubility?
    The measure of the ability of a substance to dissolve in other substance's.
  11. What is density?
    The ratio of the mass of a substance to the volume it occupies.
  12. What is a chemical property?
    The ability of a substance to be able to change or react, and to form new substances.
  13. What is combustibility?
    The ability of a substance to burn in the air.
  14. What is stability?
    The ability of a substance to remain unchanged.
  15. What is toxicity?
    The ability of a substance to cause harmful effects in plants and animals.
  16. What is an atom?
    The smallest particle of an element that retains the identity of the element.
  17. What is an electron?
    A negatively charge particle within an atom.
  18. What is a subatomic particle?
    A particle that is smaller than an atom.
  19. What is a nucleus?
    The positively charged center of an atom.
  20. What is a proton?
    A positively charged particle that is part of every atomic nucleus.
  21. What is a neutron?
    An uncharged particle that is part of almost every atomic nucleus.
  22. What is an atomic number?
    The number of protons in the nucleus of an atom.
  23. What is a mass number?
    The sum of the number of protons and the number of neutrons in the nucleus of an atom.
  24. What is an isotope?
    One or two more forms of an element that have the same number of protons but a different number of electrons in the nucleus.
  25. What is atomic mass?
    The average mass of the naturally occurring isotopes of an elements.
  26. What is the periodic table?
    A system for organizing the elements into columns and rows, so that elements with similar properties are in the same column.
  27. What is a metal?
    Typically an element that is hard, shiny, malleable and ductile, and is a good conductor of electricity and heat.
  28. What is a non-metal?
    Typically an element that is not shiny, malleable or ductile, and is a poor conductor of heat and electricity.
  29. What is a metalloid?
    An element that shares some properties with metals and some with non-metals.
  30. What is a period?
    A horizontal row of elements on the periodic table.
  31. What is a group?
    A vertical column of elements on the periodic table.
  32. What is a valence electron?
    An electron in the outermost occupied energy level of an atom.
  33. What is an ion?
    A positively or negatively charged atom or group of atoms.
  34. What is a chemical bond?
    A chemical link between two atoms, which holds the atoms together.
  35. What is an ionic compound?
    A compound made of oppositely charged ions.
  36. What is an ionic bond?
    A chemical bond that forms between oppositely charged ions.
  37. What is a molecular compound?
    A compound with particles made of atoms held together by covalent bond.
  38. What is a covalent bond?
    A chemical bond in which two atoms share one or more pairs of electrons.
  39. What is a molecule?
    The smallest discrete particle of a molecular compound; has one or more shared pairs of electrons in one or more covalent bonds.