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28 Cards in this Set
- Front
- Back
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Accuracy |
Indicates how close a measurement is to its known or accepted value |
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Activation Energy |
The minimum energy necessary to start a reaction |
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Celsius |
The most common used temperature scale in scientific work |
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Celsius Scale |
A temperature scale divided into 100 equal divisions and based on water freezing at 0° and boiling at 100°. Synonymous with centigrade |
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Chemical Change |
A change that alters the atomic structures of the substances involved and results in different properties |
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Compound |
A substance composed of elements chemically United on definite proportions by weight |
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Density |
The mass per unit volume of a substance; the mathematical formula is: D=m/V D=density, m=mass, and V=volume |
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Element |
One of the more than 100 "building blocks" of which all matter is composed. An element consists of atoms of only one kind and cannot be decomposed further by ordinary chemical means |
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Endothermic |
Referring to a chemical reaction that results in an overall absorption of heat from its surroundings |
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Exothermic |
Referring to a chemical reaction that results in the giving off of heat to its surroundings |
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Gas |
A phase of matter that has neither definite shape nor definite volume |
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Homogeneous |
Uniform; having every portion exactly like every other portion |
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Homogeneous Mixtures |
Air, sugar in water, stainless steel |
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Heterogeneous Mixtures |
Granite, wood, blood |
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Inertia |
The property of matter whereby it remains at rest or, if in motion, remains in motion in a straight line u less wasted upon by an outside force |
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Kelvin Scale |
A temperature scale based on water freezing at 273 and boiling at 373 Kelvin units; its origin is absolute zero. Synonymous with absolute scale |
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Absolute Temperature |
Temperature measured on the absolute scale, which has its origin at absolute zero (Kelvin Scale) |
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Joule |
The SI unit of work or of energy equal to work done; 1 joule=0.2388 calories |
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Liquid |
A phase of matter that has a definite volume but takes the shape of the container |
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Kinetic Energy |
The energy of motion |
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Mass |
The quantity of matter that a substance possesses; it can be measured by its resistance to a change in position or motion and is not related to the force of gravity |
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Matter |
A substance that occupies space, has mass, and cannot be created or destroyed easily |
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Meniscus |
The curve in the upper surface of a liquid close to the surface of the container or another object, caused by surface tension. It can either be concave or convex, depending on the liquid and the surface |
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Physical Change |
A chance that does not involve and alterations in chemical composition |
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Physical Property |
A property of a substance arrived at through observation of its smell, taste, color, density, and so on, which down not relate to chemical activity |
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Potential Energy |
Is stored energy due to overcoming force in nature. Energy due to the position of a body or to the configuration of its particles |
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Precision |
Indicates the reliability or reproducibility of a measurement |
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Scientific Notation |
Uses the exponential means of expressing figures |
