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Physics 9/17/10

Chapter 17 Poqwerpoint 1

QuestionAnswer
What is the smallest part of an elemnt that still acts like that element an atom
how many elements are there? 117 elements
how many are natral and how many are man-made? 90 are fond in nater and 27 are man-made
What are 5 elemnts that make up living things? (Conch) carbon, oxygen, netrogn, calcium, and hydrogran
what elemnt makes up 90% of the matter in the universe? hydrogen
what is a chemical symbol? it is a letter or letters that represent an elemnt. The first leter is awlays capitiziled
Describr the motion of atoms in solids, liquids and gases. atoms move slowest in solids, faster in liquids and fastest in gases.
whtat is a chemical symbaol? it is a letter or letters that represet an elemnt. the first letter is awlays capitalized
what is a compound? its is a substance that is made of different elements combinded in a fixed proportion
why are atoms too small to be seen with visible light? because light is made up of waves and atoms are smaller then a wavelength of visible
how can you see a molecule? it can be seen with an electron microscope.
what are compunds made of? different kinds of elements
what is in the nucleus of an atom? protons and neutrons are found in the nuclues
what is important about the nuclues? it is the center region of the atom and it contains most of the mass of the atoms.
Created by: mredohl
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