Structure and changes of matter Flashcard

Are most elements found combined or uncombined?
Most elements are found combined or in compounds when found in nature
Are most elements rare or plentiful?
Most elements are rare, some are more plentiful than others
Metal
element that has luster, is malleable, ductile, and a good conductor of h and e
Metalloids
element that has characteristics of both metals and nonmetals and is solid at room temp
Nonmetals
element that is usually a gas or brittle solid at room temp and is a poor conductor of h and e
Physical properties
Properties that do not change the chemical nature of matter.color, smell, freezing point, boiling point, melting point, density, luster, magnetism
chemical properties
Properties that do change tha chemical nature of matter,reaction to acid
flamability
How are elements organized on periodic table
Today they are organized by atomic number because there are so many, mandeleev organized them by atomic mass.
results of elements and compounds after heating
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.
results of elements and compounds after electrolysis
Compounds separate into the elements they are composed of
difference between elements and compounds
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.
physical change
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
chemical change
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.
how do you know when a chemical reaction has occurred
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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