Chapter 5 Combining Atoms and Molecules
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| A ___ is a pure substance that contains two or more elements. | compound
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| A ___ ___ is an ingredient list for a compound that uses atomic symbols andsubscripts. | chemical formula
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| A neutral particle that forms as a result of electron sharing is a ___. | molecule
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| Compounds have properties that are different from the ___ that compose them. | elements
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| Table salt is formed when the elements ___ and ___ combine. | sodium, chlorine
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| An ionic bond is an electrical attraction between ___ and ___ charged ions in an ionic compound | positively, negatively
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| An atom that is not neutral because it has gained or lost electrons is an ___. | ion
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| The force that holds atoms together in a compound is called a ___ ___. | chemical bond
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| An ___ ___ is an electrical attraction between positively and negatively charged ions in an ionic compound. | ionic bond
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| An ___ compound is one in which two or more elements or compounds gain or loseelectrons and form ionic bonds. | ionic
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| In an ionic compound, the positive ion is usually a ___. The negative ion is a ___-___. | metal, non-metal
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| If an ionic compound has only two different ions, it is called a ___ ___. | binary compound
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| Metals like magnesium and calcium from Group 2 of the periodic table can form binaryionic compounds with elements from either Group ___ or Group ___. | 16, 17
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| Many ionic compounds dissolve in water. Water with dissolved ionic compounds is a ___ ___ of electricity. | good conductor
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| ___ ___ ___ are one method for using atomic symbols and dots representing electrons to help predict how compounds will form. | Lewis dot diagrams
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| The number of electrons in an atom’s outermost energy level is its ___. | valence
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| The noble gases, elements from ___ ___ of the periodic table, have eight valence electrons. | Group 18
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| Some atoms become ions by gaining or losing electrons until they have the same filled___ (or valence) energy levels as noble gases. | outer
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| A ___ ___ is a chemical bond formed when atoms share electrons. | covalent bond
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| All ___ ___ are covalent compounds based on carbon atoms. | organic compounds
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| ___ compounds can be solids, liquids, or gases at room temperature. | Covalent
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| Atoms that have ___ electrons can form compounds if they share electrons. | unpaired
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| Carbon has ___ unpaired electrons, and can therefore form four covalent bonds. | four
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| A ___ ___ consists of two pairs of electrons shared between the same two atoms. Double bonds are stronger than single bonds. | double bond
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| ___ ___ are stronger than single or double bonds and share three pairs of electrons. | Triple bonds
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| ___ make up about two-thirds of the elements and have many useful properties. | Metals
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| Metals are good ___ of heat and electricity because their electrons are free to move. | conductors
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| Metals have a ___ melting point and a ___ boiling point. | high, high
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| ___ is the ability of a material, like metal, to be hammered or rolled into sheets. | Malleability
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| ___ is the ability of a substance to be pulled into wires. | Ductility
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| ___ (or Molecules) of metal in solids pack together as closely as possible in a regular, three dimensional pattern. | Atoms
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| A ___ ___ is a bond formed when many metal atoms share their pooled electrons. | metallic bond
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| Metal atoms combine in regular patterns in which some ___ are free to move from atom to atom. | electrons
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| In a metal, individual atoms lose electrons to become positive ___. | ions
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| Crystals are regular, repeating arrangements of atoms, ions, or ___. | molecules
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| Crystals can be held together by metallic, ___, or covalent bonds. | ionic
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| A ___ ___ is the smallest repeating pattern that shows how the atoms, ions, or molecules are arranged in a crystal. | unit cell
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| One common crystal is table salt, also known as ___ ___. | sodium chloride
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| Sodium chloride, NaCl, is a(n) ___ crystal. | ionic
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| Ionic crystals are ___, unlike solid metals. | brittle
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| ___ are covalent compounds made up of many small, repeating units linked together in a chain. | Polymers
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| A ___ is a small molecule that forms a link in a polymer chain. | monomer
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| ___ is a synthetic polymer used for grocery bags and food wrap. | Polyethylene
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| Organic polymers are polymers that contain the element ___ and are involved with life. | carbon
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| The monomer of a protein is an ___ ___, which includes carbon, nitrogen, and oxygenatoms. | amino acid
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| ___ are organic polymers whose monomer is a sugar molecule called amonosaccharide. | Carbohydrates
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