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30 Cards in this Set
- Front
- Back
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Exothermic reaction |
Chemical reaction that releases energy (temperature gets up, increases). ex. combustion. |
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Endothermic reaction |
Chemical reaction that absorbs energy (temperature gets down, decreases) ex. photosynthesis. |
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Valence Electrons |
Electrons in the outermost energy level of an atom; they determine an element's chemical properties (reactivity). |
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Metal |
Element that is malleable, ductile, good conductor of heat and electricity, and generally has a shiny luster. |
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Nonmetal |
Elements that are usually gases or brittle solids and poor conductors of heat and electricity; are the bases of the chemicals of life. |
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Metalloids |
Elements that has characteristics of both: metals and nonmetals, solids at room temperature and are semiconductors. |
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Organic Compound |
Compounds that are usually come organisms. They always have Carbon but may contain other elements like Hydrogen, Oxygen, Nitrogen, Sulfur and Phosphorous. CHON P S |
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Chemical formula |
A way of describing the number of atoms that makes up one molecule of a compound. |
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Compound |
A pure substance made of 2 or more elements bonded together chemically, and cannot be separated by chemical means. |
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Chemical reaction |
Change that takes place when 2 or more substances (reactants) interact to form new substances (products). |
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Chemical equation |
A way of writing changes in the arrangement of atoms during a chemical reaction, using chemical symbols. |
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Element |
Natural pure substance that cannot be broken down into simpler materials and has unique properties. |
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Coefficient |
In a chemical equation, the number placed in front of a chemical formula to balance the equation. Determine the number of molecules. |
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Subscript |
Is a number that appears smaller than the normal line and indicates the number of atoms of that element in the compound. |
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Reactants |
Compounds or elements that change during a chemical reaction. Found before the arrow. |
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Products |
Compounds or elements that are the result of a chemical reaction. Found after the arrow. |
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Chemical digestion |
Process that uses enzymes to breaks large food molecules into smaller molecules that can be taken in by cells, changing the composition. |
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Mechanical digestion |
Process of breaking food into smaller pieces by chewing and mashing, without changing the composition. |
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Periodic Table |
Chart where all the elements are organized into periods and groups according to their properties. Table arranged by atomic number. |
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Periods |
A row of elements in the Periodic table, elements in the same period share the same number of energy levels. |
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Groups |
Column of elements in the Periodic table, in which elements have certain properties in common, mainly chemical. |
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Alkaline metals |
Elements in group 1 in the Periodic table, that are highly reactive metals, and do not occur freely in nature. |
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Halogens |
5 highly reactive nonmetallic elements found in group 17 of the Periodic table, that are "salt formers". |
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Noble Gases |
Elements in group 18 with similar properties: odorless, colorless monatomic gases, stable that occur naturally. |
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Atom |
A very small particle that makes up most kinds of matter and consists of smaller parts called subatomic particles. |
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Atomic number |
Number of protons in the nucleus of each atom of a given element; the top number in the Periodic table. A |
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Atomic Mass |
Average mass of an atom of an element; sum of protons and neutrons in an atom. M |
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Proton |
Positively charge particle located in the nucleus of an atom and that is counted to identify the atomic number. P |
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Neutron |
Uncharged particle located in the nucleus of an atom. N |
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Electron |
Invisible, negatively charged particle located in a cloudlike formation that surrounds the nucleus of an atom. E |
