Term
| Are most elements found combined or uncombined? |
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Definition
| Most elements are found combined or in compounds when found in nature |
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Term
| Are most elements rare or plentiful? |
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Definition
| Most elements are rare, some are more plentiful than others |
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Term
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Definition
| element that has luster, is malleable, ductile, and a good conductor of h and e |
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Term
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Definition
| element that has characteristics of both metals and nonmetals and is solid at room temp |
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Term
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Definition
| element that is usually a gas or brittle solid at room temp and is a poor conductor of h and e |
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Term
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Definition
| Properties that do not change the chemical nature of matter.color, smell, freezing point, boiling point, melting point, density, luster, magnetism |
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Term
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Definition
Properties that do change tha chemical nature of matter,reaction to acid
flamability |
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Term
| How are elements organized on periodic table |
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Definition
| Today they are organized by atomic number because there are so many, mandeleev organized them by atomic mass. |
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Term
| results of elements and compounds after heating |
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Definition
| elements do not decompose after heating, do not break down. Compounds when heating break chemical binds and break down into the elements they are composed of. |
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Term
| results of elements and compounds after electrolysis |
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Definition
| Compounds separate into the elements they are composed of |
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Term
| difference between elements and compounds |
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Definition
Elements are extremely basic and individually consist of one kind of atom. Compounds are basically elements that have been inter-mingled with one another. Elements can be represented by their symbols while compounds have formulas. Elements can no longer be broken down, while compounds can through chemical reactions.
A distinguishing factor for elements is their atomic number, while compounds can be interpreted through their chemical bonds. |
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Term
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Definition
| A physical change does not produce a new substance. Changes in state or phase (melting, freezing, vaporization, condensation, sublimation) are physical changes. energy and states |
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Term
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Definition
| A chemical change makes a substance that wasn't there before. There may be clues that a chemical reaction took place, such as light, heat, color change, gas production, odor, or sound. |
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Term
| how do you know when a chemical reaction has occurred |
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Definition
| The reaction of two or more elements together results in the formation of a chemical bond between atoms and the formation of a chemical compound. a new substance is formed. two elements/chemicals or compounds combine |
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