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Changes in Matter
elements, atoms, chemical and physical changes, acids, bases
Term | Definition |
---|---|
Atom | smallest piece of an element |
Electron | part of an atom with a negative charge |
Proton | part of an atom with a postive charge |
Neutron | part of an atom with a neutral charge |
Atomic number | is the number of protons and electrons in an atom |
Valence Electron | outermost electrons that participate in chemical bonding |
Chemical Reaction | process where substances interact to create a new substance |
Reactants | starting substances in a chemical reaction |
Products | substances produced by a chemical reaction |
Endothermic Reaction | chemical reactions that absorb thermal energy |
Exothermic Reaction | chemical reactions that give off thermal energy |
Qualitative Data | words that describe an observation |
Quantitative Data | numbers describing an observation |
Acid | produces hyrdronium ions pH 0-6.5 |
Base | produces hydroxide ions pH 7.5-14 |
pH | measures the range of acids and bases 0-14 |
Neutral | pH of 7 (water) |
Density | mass divided by volume |