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Chapter 13,14,15test
| Question | Answer |
|---|---|
| the joining of two atoms to form new substances | chemical bonding |
| interaction that holds two atoms together | chemical bond |
| what is the number of protons ( and electrons) in an atom? | atomic number |
| what are electrons organized in? | energy levels |
| what is the electron(s) in the outermost energy level? | valence electrons |
| what determines whether the atom will form bonds? | valence electrons |
| what is considered a full outer energy level? | 8 |
| atoms bond by ---, ---, or --- electrons in the outermost energy level. | gain,lose or share |
| do all atoms need 8 electrons to have a full outer energy level? | no |
| how does an ionic bond form? | when electrons are transfered from atom to atom |
| when is an atom nuetral? | when it has the same number of electrons as protons |
| what are charged particles that form when atoms gain or lose electrons? | ions |
| nonmetals usually --- electrons | gain |
| what is a repeating 3D pattern formed when ions bond? | cyrstal lattice |
| what type of charge do ionic compounds have? | none |
| what are some properties of covalent bonds? | brittle, low melting and boiling points |
| in covalent bonds, atoms --- electrons | share |
| what is a molecule? | compound that consists of two or more atoms joined in a definite ratio |
| what are electron dot diagrams used to show? | the number of valence electrons in an atom |
| diatomic molecules are molecules made up of --- atoms | 2 |
| what are diatomic elements? | elements that are found in nature as diatomic molecules |
| what is a bond formed from the attraction of metal ions and electrons? | metallic bond |
| what are some properties of metal? | ductile, malleable, conduct electric current |
| a process in which one or more substances change to make one or more new substances | chemical reaction |
| what is a precipitate? | a solid substance that is formed in a solution |
| what are some signs of a chemical reaction? | gas formation, precipitate, change in energy |
| what is the froce that holds 2 atoms together in a molecule? | chemical bond |
| for new bonds to form, the old ones must --- | break |
| shorthand way to use chemical symbols and numbers to represent a substance | chemical formula |
| what is a subscript? | a number written to below and to the right of a chemical formula in a formula |
| tetra= | 4 |
| di= | 2 |
| deca = | 10 |
| hexa= | 6 |
| octa= | 8 |
| mono= | 1 |
| tri= | 3 |
| penta= | 5 |
| hepta= | 7 |
| nona= | 9 |
| what uses chemical symbols and formulas as a shortcut to describe a chemical reaction? | chemical formula |
| what is a coefficent? | the number that is placed in front of a chemical symbol or formula |
| states that mass is neither created or destroyed in ordinary chemical and physical changes | law of conservation of mass |
| type of reaction in which two or more substances combine to form one new compound | synthesis reaction |
| what reaction is the reverse of a synthesis reaction? | decompostition reaction |
| type of reaction in which an element replaces another element that is part of a compound | single-displacement reaction |
| what are the products of a single-displacement reaction? | a new compound and a different element |
| a type of reaction in which ions from two compounds change places | double-displacement reaction |
| what is needed to break chemical bonds in reactants? | energy |
| exothermic --- energy and endothermic --- energy | releases; takes in |
Created by:
kfran0112
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