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Chapter 17 ppt.1
cdeutsch/ursuline
| Question | Answer |
|---|---|
| What is the smallest part of an element that still acts like that element? | an atom |
| How many elements are there? | 117 elements |
| How many 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, calcium, 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 and fastest in gases. |
| What is a chemical symbol? | It is a letter or letters that represent an element. The first letter is always captolized. |
| It is a substance that is made of different elements combined in a fixed proportion. (water ) | |
| Why are atoms too small to be seen with visible light? | Because light is made up of waves and atoms are smaller than a wavelength of visible light. |
| how can you see a molecule? | It can be seen with an electron microscope. |
| What are compounds made of? | Different kinds of elements. |
| What is in the nucleus of an atom? | protons and neutrons are found in the nucleus |
| What is important about the nucleus? | It is in the center region of the atom and it contains most of the mass of the atoms. |
Created by:
cdeutsch
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