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| The study of the composition, structure, and properties of matter and of changes that occur in matter. |
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| Anything which that has mass and occupies space. |
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| Quantities large enough to be seen by the unaided eye. |
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| Particles which are so small that they can be viewed only with special instruments. |
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| The smallest distinctive units in a sample of matter. |
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| Larger units in which two or more atoms are joined together. |
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| Refers to the type of atoms and the relative proportions of the different atoms in a sample of matter. |
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| A characteristic displayed by a sample of matter without undergoing any change in its composition. |
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| When a sample of matter undergoes a noticeable change at the macroscopic level but no change in composition. |
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| Chemical Change or Chemical Reaction |
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Definition
| When a sample of matter undergoes a change in composition and / or a change in the structure of its molecules. |
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| A type of matter that has a definite, or fixed, composition that does not vary from one sample of the substance to another. |
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| Substance that cannot be broken down into other simpler substances by chemical reactions. |
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| A substance made up of atoms of two or more elements, with the different kinds of atoms combined in fixed proportions. |
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| A one or two letter designation derived from the name of an element. |
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| A group of substances which has no fixed composition; its composition may vary over a broad range. |
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| Homogenous Mixture or Solution |
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| A mixture that has the same composition and properties throughout. |
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| Varies in composition and / or properties from one part of the mixture to another, as in a glass of ice water. |
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| A tentative explanation or prediction concerning some phenomenon. |
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| Process of carefully testing a hypothesis. |
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| The facts obtained through careful observation and measurements made during experiments. |
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| Widely accepted patterns which have large collections of data to verify them. |
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| Tangible items or pictures which represent invisible processes and explain complicated phenomena. |
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| Provides explanations of observed natural phenomena and predictions that can be tested by further experiments. Often serve as a framework for organizing scientific knowledge. |
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| International System of Units (SI) |
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Definition
| A common system of measurement which was adopted in 1960 and provides a modernized version of the metric system established in France in 1791. |
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| The SI base unit of length which is a unit that is about 10% longer than the yard. |
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| A liter is an old metric unit which has the same volume as 1 cubic decimeter, or 1000 cubic centimeters. |
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| The quantity of matter in an object. |
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| The force of Earth's gravity on an object; the force is directly proportional to the mass of the object. |
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| The SI base quantity of mass which is about the mass of 1 liter (slightly more than 1 quart) of water. |
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| The SI base unit for measuring intervals of time. |
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| The SI base unit of temperature. |
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| A temperature scale in which the freezing point is 0 degrees Celsius (°C) and the boiling point is 100°C. |
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| A temperature scale in which the freezing point is 32°F and the boiling point is 212°F |
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| Refers to how closely individual measurements agree with one another. The precision is good (or high) if each of the measurements is close to the average of the set. The precision is poor (or low) if some (or all) of the measurements deviate widely from the average value. |
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| Refers to how close the average of a set of measurements comes close to the true, or most probable, value. Measurements of high precision are more likely to be accurate than those of poor precision, but even highly precise measurements are sometimes inaccurate. |
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| Used to reflect the precision of a measurement - the more significant figures, the more precise the measurement. |
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| A ratio of terms - equivalent to the number 1 - used to change the unit in which we express a quantity. |
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| The mass per unit volume of a substance. |
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| When two liquids do not mix together to form a solution. |
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