Science Terms-Ch. 4
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anything that has mass and takes up space
- a small particle that makes up most types of matter
Law of conservation of matter
matter is not created or destroyed- it only changes form
negatively charged particles, subatomic particles---they surrounds the nucleus of an atom
- -the positively charged central part of an atom
- -the posively charged particles in the nucleus of an atom----also what is counted to identify the atomic number
- -uncharged particles located in the nucleus of an atom
-matter made of only one kind of atom
-the number of protons in the nucleus of each atom of a given element; it's the top number in the periodic table
- -two or more atoms of the same element that have different numbers of neutrons in their nuclei.
-the number of protons plus the number of neutrons it contains.
- -the sum of the number of protons and neutrons in the nucleus of an atom
- -the average mass of an atom of an element
-and element that is malleable, ductile, a good conductor of electricity and generally has a shiny or metalic luster.
-elements that are usually gases or brittle solids and poor conductors of electricity and heat; are the basis of chemicals of life
-elements that have characteristics of both metals and nonmetals and is a solid at room temperature
-matter that has the same composition and properties throughout
Examples: a bar of gold (all gold), a sheet of aluminum (all aluminum)
-a substance produced when elements combine and whose properties are different from each of the elements in it
- Examples: Water (H2O), Hydrogen peroxide (H2O2), carbon dioxide (CO2)
-a combination of compounds and elements that has not formed a new substance and whose properties can be changed without changing the mixture's identity
Examples: water and sand in bucket, air, our blood
- -a mixture that has larger parts that are different from each other.
- Examples: oil and water, water and sand.
-a mixture that is the same throughout
- Examples: air, water
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