Term | Definition |
Chemistry | The study of the composition, structure, and properties of matter and the changes it undergoes |
Change of State | A physical change of a substance from one phase to another (example: gas to liquid) |
Chemical Change | A change in which one or more substances are converted into different substances |
Chemical Property | The ability of a substance to undergo a change that transforms it into a different substance |
Compound | A substance that is made from the atoms of two or more elements that are chemically bonded |
Element | A pure substance made of only one kind of atom |
Gas | The state of matter in which a substance has neither definite volume nor definite shape |
Liquid | The state of matter in which the substance has a definite volume but an indefinite shape |
Mass | A measure of the amount of matter |
Matter | Anything that has mass and takes up space |
Mixture | A blend of two or more kinds of matter, each of which retains its own identity and properties |
Physical Change | A change in a substance that does not involve a change in the identity of the substance |
Physical Property | A characteristic that can be observed or measured without changing the identity of the substance |
Pure Substance | A substance that has a fixed composition and differs from a mixture in that every sample of a given pure substance has exactly the same characteristic properties and composition |
Solid | The state of matter in which the substance has definite volume and definite shape |
Solution | the best mixed mixture |
Density | a measurement that reflects how closely packed the particles in a substance are |
Hypothesis | An if, then statement that can be tested |
Independent Variable | the variable that you change |
Dependent Variable | the variable that responds and you measure it |
Controlled Variable | part of an experiment that you do not change |
Heterogeneous Mixture | A blend of two or more substances that are not evenly mixed |
Homogeneous Mixture | A blend of two or more substances that are evenly mixed |
Volume | a measure of the amount of space occupied by an object |
Precision | how well repeated measurements agree with each other |
Accuracy | how close a measurement is to the accepted value |
Qualitative measurement | a description that does not use numbers |
Quantitative measurement | a description that uses numbers |