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Sci Explosion ch 7
Science Explosion v4, chapter 7
Question | Answer |
---|---|
alkalis | bases that dissolve in water |
atom | smallest piece of an element |
atomic mass | sum of protons and neutrons |
atomic number | number of protons in an atom’s nucleus |
atomic theory | scientists ideas about atoms |
chemical change | another name for a chemical reaction |
chemical reaction | This occurs when molecules combine to create a new substance. |
chemical symbols | abbreviations for elements |
chemistry | study of matter |
compound | molecules produced by a reaction |
element | substance containing only one kind of atom |
group | vertical columns of table |
indicator | changes color when exposed to acid or base |
ion | atom that has gained or lost an electron |
molecule | atoms joined together |
neutral | pH of 7.0 |
particle accelerator | atom smasher |
period | horizontal rows of periodic table |
pH scale | “power of hydrogen”; numbered from 0-14 |
stable | When an atom's outermost shell is completely full so the shell is closed. |