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38 Cards in this Set
- Front
- Back
What holds metal ions together in a metal lattice?
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The cations in a metal form from a lattice that is hed in place by strong metallic bonds between the cations and the surronding valence electrons.
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What characteristics of a metallic bond explains some of the properties of metals.
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The mobility of electrons within a metal lattice explains some of the properties of metals.
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How can scientist design alloys with specific properties.
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Scientists can design alloys with specific properties by varying the types and amount of elements in an alloy.
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Explain why the matallic bonds in some metals are stronger that the bonds in other metals.
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The more valence electrons an atom can contribute to the shared pool, the stonger the matallic bond will be.
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How does adding carbon to steel make the steel harder and stonger?
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The carbon atoms form bonds with neighboring iron atoms. These bonds make the lattice harder and stronger that a lattice that contains only iron.
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Which elements has a higher melting point, potassium in Group 1A or calcium in Group 1B? Give a reason for your answer.
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Calcium in Group 1B because it has a higher melting point.
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Can two different elements form a metallic bond together?
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Yes
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What information is provided by the formula for an ionic compound?
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The formula of an ionic compound descibes the ratio the ions in the compounds.
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What compound is made from only two elements?
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Binary
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When a metal forms more than one ion, the name of the ion contains a Roman numeral to indicate the _______ on the ion.
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Charge
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The formula for sodium sulfide is Na2S. The sodium ion has a charge of 1+. What must the charge on the sulfide ion be?
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0
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What information is provided by the name and formula of a molecular compound?
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The name and formula of a molecular compound describes the type and number of atoms in a molecule of the compund.
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Describe the general rule for naming molecular compunds.
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The general rule is that the most metallic element appears first in the name.
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In the formula of a molecular compound, the number of atoms of an element in the molecule is represented by a ________.
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Subscript
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What is the metal with the highest melting point?
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Tungsten
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The cations in a metal form a lattice. What holds the lattice in place?
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By strong metallic bonds between cation and the surronding valence electrons.
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Some of the properties of metals can be explained by the _______ of the electrons within a metal lattice.
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Mobility
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Name two important properties of metals that can explained by metallic bonding.
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Conductivity and Mallebility
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What percentage of gold in jewelry that is labeled 18-karat gold?
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75 percent
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How do the hardness and strength of bronze compare to the hardness and strength of copper alone and tin alone?
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Because bronze is hard used for many things also brass is softer than bronze makes it easier to form things.
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Name two factors that scientist can vary to designalloys with specific properties.
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1.By varying the types
2. amounts of elements in an alloy. |
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When carbon is added to iron, the lattice becomes _____ and ________ than a lattice thaat contains only iron.
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Harder and Stonger
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What elements that all types of steel contain.
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carbon and iron
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Explain why pure aluminum is not the best material for the body of a plane.
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It bends and dents easily
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What type of alloy is used to make p airplane parts that needs to be extremely lightweight?
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Aluminium- Magnesium Alloy
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Describe the type of electron configuration that makes an atom stable and not likey to react.
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When the highest occupied energy level of an atom is filled with electrons, the atom is stable, and not likely to react.
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Some elements achieve stable electron configurations through the transfer or _____ between atoms
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Electrons
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By losing one valence electron, a sodium atom achieves the sme electron arrangement as an atom of ____.
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Neon
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An ion with a negative charge is called a _____.
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Anion
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An ionic forms when ____ are transferred from one atom to another.
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electrons
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The formula for magnesium chloride is MgCl2. The charge on the magnesium ion is 2+. What is the charge on each chloride ion. What is the answer?
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1-
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The shape of an ionic crytal depends on _______ of _____.
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Arrangement of ions.
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Nitrogen has five valence electrons. How many pairs of electrons must two nitrogen atoms share in order for each atm to have eight valence electrons?
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Three
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What molecular models that show orbitals of atoms overlapping when a covalent bond forms.
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Space-Filling
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In general, elements at the _____ of a group have a greater attraction for electrons than elements at the ____ of a group have.
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Top..........................Bottom
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In a hydrogen chloride molecule, the shared electrons spend more time near the _____ atom than near the _____ atom.
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Chlorine................Hydrogen
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When atoms form a polar covalent bond, the atom with the greater attraction for electrons has a partial ____ charge.
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Negative
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Water has a higher boiling pint than carbon dioxide because attractions between polar molecules are _____ than attrctions between nonpolar molecules.
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Stronger
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