chem 0.0 / 5 ? ChemistryssdGCSEAQA Created by: camilarojas2001Created on: 01-07-17 09:48 describe a gas. the particles are far apart and random and they move fast in all directions. 1 of 13 describe a liquid. the particles are close together and move around each other. 2 of 13 describe a solid. the particles are close together and vibrate around the fixed positions. 3 of 13 what is a state change? state changes are physical changes, they can be reversed. 4 of 13 pure subsatnaces cannot be changed. Is the same in all parts. 5 of 13 what happends when a solid melts? the particles gain enough energy to overcome the weak forces. 6 of 13 proton charge = +1 mass=1 7 of 13 electron charge = -1 mass = 1/1835 8 of 13 neutron charge = 0 mass = 1 9 of 13 atomic number always the smallest number on the periodic table. 10 of 13 acid an acid has a PH lower than 7 11 of 13 Alkali an alkali has a PH higher than 7 12 of 13 what color is an acid? red orange or yellow 13 of 13
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