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Ch 18 Test Review
Chapter 18 Chemical Bond Test Review
| Question | Answer |
|---|---|
| An atom that has gained or lost electrons is called a(n)_____________. | ion |
| An atom is ___________ when its outer energy level is filled with electrons. | chemically stable |
| A(n) ________ tells what elements make up a compound and the ratios of the atoms of those elements. | chemical formula |
| A molecule that has a positive end and a negative end is a(n)__________ molecule. | polar |
| A bond that forms between atoms when they share electrons is a(n) _________ bond. | covalent |
| A positive or negative number that is assigned to an element to show its combining ability in a compound is a(n) _______________ . | oxidation number |
| A compound that is composed of only two elements is a(n) _______________. | binary compound |
| The force of attraction between the opposite charges of the ions in an ionic compound is a(n) ___________ . | chemical bond |
| Molecules that do not have oppositely charged ends are __________ molecules. | nonpolar |
| A(n)__________ is formed when atoms gain, lose, or share electrons. | ionic bond |
| The properties of a compound are (the same as, different from) the properties of the elements that make up the compound. | different from |
| Na and Cl are chemical (symbols, formulas). | symbols |
| NaCl and NaOH are chemical (symbols, formulas). | formulas |
| The number 2 in the formula H2O tells you that each unit of this compound contains two (hydrogen, oxygen) atoms. | hydrogen |
| The total number of atoms in Fe2O3 is (two, five, six). | five |
| An atom is chemically stable if its outer energy level (is filled with, contains no) electrons. | is filled with |
| For atoms of most noble gases and most other elements, the outer energy level is full when it has (three, eight) electrons. | eight |
| A chemical bond is a (force, chemical) that holds atoms together in a compound. | force |
| Chemical bonds form when atoms lose, gain, or (share, multiply) electrons. | share |
| The noble gases do not readily form compounds because they (are, are not) chemically stable. | are |
| Atoms become more stable by forming chemical bonds. | + |
| Compounds have properties unlike those of their elements | + |
| In a chemical formula, a subscript tells how many atoms of an element are in a unit of a compound. | + |
Created by:
joanlafferty