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MonacoPS1
Module 1 of Marcie Monaco's Physical Science Course
| Question | Answer |
|---|---|
| Atom | An atom is the smallest existing particle of a pure element that can exist and still maintain the properties (or chemical characteristics) of that element. |
| Molecule | A molecule is the smallest particle of a chemical compound that exists. |
| Element | Elements are substances that are made up of only one kind of atoms. Elements are made up of atoms that all have the same atomic number (or number of protons). In other words, elements are the purest substances on earth. |
| Compound | Compounds are substances made from at least two kinds of atoms or molecules. The elements that form a compound can not be separated by physical means (heating, cooling, etc.) -- only by a chemical reaction. |
| Mixture | A mixture is a combination of any two or more substances in which each substance retains its identity. In other words, the chemicals in a mixture do not react with each other. |
| Physical Properties | Physical properties are qualities of a substance that can be identified and measured without changing the substance. |
| Units | Units of measure are what we use to express the size of an object. We can use units of measure to measure various physical properties of objects, such as weight and volume. Examples are milliliters, centimeters, gallons, kilograms, and inches. |
| Chemical Properties | Chemical properties are those qualities which identify how a specific type of matter will react and change when combined with another type of matter. |
| Concentration | The quantity of substance within a certain volume. |
| Significant Figures | "Rounding off" based on the degree of accuracy of a measurement. |
| Hypothesis | A hypothesis is a guess as to why something happens |
| Accuracy | Accuracy is the ability to achieve desired results. |
| Precision | Precision is the ability to achieve desired results REPEATEDLY. |
| Theory | An explanation for an observation or series of observations that is substantiated by a considerable body of evidence |
| Scientific Law | A statement or principle which has been proven true WITHOUT EXCEPTION by repeated and successful testing and/or observation. |