| A | B |
|---|
| science | an organized way of using evidence to learn about natural world |
| observation | using your senses to gather information |
| data | evidence collected in the lab |
| inference | logical interpretation |
| hypothesis | an educated guess |
| controlled experiment | one variable is changed in an experiment |
| manipulated variable (independent) | the variable that is changed |
| responding variable (dependent) | the variable that responds to the manipulated variable |
| theory | well-tested explanation |
| biology | study of life |
| atom | basic unit of matter |
| nucleus | the component of the atom that contains protons and neutrons |
| electron | negatively charged particle (-) |
| element | a pure substance that consists of entirely one type of atom |
| isotope | atoms of an element that have different number of neutrons |
| covalent bond | atoms that share electrons |
| ionic bond | a bond where one atom gains and one loses an electron |
| molecule | smallest unit of most compounds |
| acid | contains more H+ ions |
| base | contains more OH-ions |
| pH scale | indicates the concentration of H+ in a solution |
| buffer | neutralizes pH with a weak acid or weak base |
| solute | a substance that dissolves in a solvent |
| solvent | the solution that dissolves a substance |
