Semester Test Chapter 14
Terms
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- molecules
- form when they share electrons
- Bohr model
- one of the first models of the atom, created by Niels Bohr
- radioactive elements
- elements that are unstable & give off energy when turning into other elements
- solution
- a kind of mixture formed when one substance is dissolved in another
- atomic number
- Equals the number of proton in the nucleus of an atom
- litmus paper
- an indicator used to safely test acids and bases
- neutrons
- Particles in nucleus with neutral charge
- electron cloud model
- model of atom in which the electrons seem to form a cloud as they move around the nucleus
- electrons
- These have a negative charge and orbit the nucleus
- Periodic Table
- a table of elements arranged according to their atomic unmber
- water
- an example of a molecule
- symbols
- represent elements
- salt
- an example of an ion
- protons
- positively charged particles located in the nucleus
- formulas
- represent compounds
- stirring, shaking, heating
- ways to increase the rate of dissolving
- ions & molecules
- 2 types of compounds
- atoms
- building blocks of matter
- mixtures
- chicken soup, fruit salad, trail mix
- ions
- form when they gain or lose electrons