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physics
chapter 17 Powerpoint 1
| Question | Answer |
|---|---|
| how many elements are there | 117 elements. |
| how can you see a molecule? | It can be seen with an electron microscope. |
| what is the building blocks of atoms? | mattter |
| what is a letter or letters that represent an element? | chemical symbol |
| what percent of the universe is composed of dark matter? | 23% |
| hydrogen is the lightest element and makes up what percent of the atoms in the universe? | 90% |
| what is the lightest element? | Hydrogen. |
| where are electrons located? | orbiting around the nucleus. |
| what is the number of protons in the nucleus? | atomic number |
| what charge do electrons have? | negative charge |
| what makes up everything in the universe we see, feel, taste, hear, and smell? | atoms |
| what are the ways atoms recycle? | breathing in and out, scratching your skin, and coughing and sneezing. |
| In the 1800's who said matter was made of atoms because of studying chemical reactions? | John Dalton |
| what is the most common molecule? | H2O Water. |
| What is the mass of an atom primarily concentrated in? | nucleus |
| How do you find the mass number? | protons + neutrons |
| In 1827, what Scottish botanist studied pollen grains under a microscope? | Robert Brown |
Created by:
14_hbentrup
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