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physics science
chapter 17 powerpoint 1
| Question | Answer |
|---|---|
| wwhat is th smallest part of an element that still acts like that element? | an atom |
| how many elements are there? | 115 more |
| how mant are natural and how many are man made? | 90 are found in nature and 27 are man made |
| what are the 5 elements that make up living things? (conch) | carbon,oxygen,nitrogen,calium, and hydrogen |
| what element makes up 90% of the matter in the universe? | hydrogen |
| what is a chemical symbol? | it is a letter or letters that represent an element. the first letter is always captolized |
| Describe the motion of atoms in solids, liquids, and gases. | atoms move slowest in solids,faster in liquids, adn fastest in gases. |
| what is a compound? | It is a substnace that is made of different elements combined 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 than a wvelength of visible |
| how can you see a molecule? | it can be seen wiht an electron microscope |
| what are compounds made of? | different kinds of elements. |
| what is in the nucleus of an atoms? | protons and neutrons are found in the nucleus |
| what is important about the mucleus? | it is the center region of the atom and it contains most of the mass of the atoms. |
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14_ssindelar
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