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Chemistry Ch. 3-6



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1.subatomic particle with a charge of +1 existing inside nucleus
4.homogeneous mixture involving two or more substances; composition can be varied within limits.
6.type of chemical bond formed by the sharing of electrons between two atoms.
7.any pure substance that cannot be broken down into two or more different simple substances.
8.energy possesed by a substance by virtue of its motion
13.smallest piece of an element that can exist and still exhibit the properties of that element.
15.heterogeneous matter composed of two or more pure substances, each of which retains its identity and specific properties
16.atom in which the number of electrons does not equal the number of protons
17.energy possesed by a substance by virtue of its position in space or its chemical composition
20.all changes in a substance other than changes in its chemical composition
22.smallest particle of a pure substance that can exist and undergo chemical changes.
24.method of expressing the covalent bonds among atoms in a molecule using the octet rule and dots to represent bonds
26.chemical bond in which two atoms share two pairs of electrons
29.method of expressing the chemical bonds among atoms in a molecule using lines to repesent the bonds.
30.region of space surrounding the nucleus of an atom in which there is a high probability of finding up to two electrons
31.elements that combine with metals and other nonmentals,poor conductors of heat,and brittle.
33.matter that is uniform in composition and properties throughout the sample
34.an arbitrarily assigned value of exaclty 12 amu for an atom of carbon-12.
35.any atom having the same atomic number as number of protons but different mass
2.small dense region at the center of an atom containing nearly all the mass of the atom
3.number of protons in the nucleus of an element's atom
4.joules of heat required to raise the temperature of 1 g of a substance by one degree C or K
5.subatomic particle with no chage located in the nucleus
9.subatomic particle with a relative charge of -1; existing outside the nucleus
10.degree to which an atom attracts a pair of covalently bonded electrons to itself.
11.special type of nonmetal which are nonreactive
12.matter that is not uniform in composition and properties throughout the sample, rather two or more distinct sunbtances unequally distributed.
14.any ion made up of more than one atom
18.changes that result in changes in the composition of the substance
19.any pure substance that can broken down by chemical means into twop or more different simple substances
21.any ion carrying a negative charge
23.the attractive forces that hold atoms together as compounds
25.any ion carrying a positive charge
27.chemical bond formed by transfer of electrons from atom to atom. apositive and negative charged ion are held together.
28.elements that lie on the colored stair step line with both metallic and nonmetallic properties.
32.elements with a high luster,good conductors of electricity, and ductile.

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