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HS unit 4

QuestionAnswer
What is the "magic number" of electrons that an element needs in the outer shell? 8
What is an ionic bond? a force of attraction between 2 oppositely charged ions; 1 metal and 1 nonmetal
What is a covalent bond? the ones having strong intra-molecular bonds caused by the sharing of valence electrons; 2 nonmetals
How do you get a cation? When an atom or group of atoms loses one or more electrons
How do you get an anion? When an atom or group of atoms gains one or more electrons
What is the total number of atoms in the compound: XeF2 3
What is the term for the "written below" number? Subscript
What does the number written below the line represent? The number of atoms
What does an oxidation number tell you? How many electrons were lost or gained
Where do you find the oxidation number in the formula? Above the element symbol
What is the prefix that is used to show there are four atoms of an element in a chemical formula? Tetra
What is the prefix that is sometimes used to show that there is one atom of an element in a chemical formula? Mono
Is Li2S ionic or covalent? Ionic
What is the name of Li2S? Lithium Sulfide
Is NCl3 ionic or covalent? Covalent
What is the name of NC13? Nitrogen Trichloride
Is PF5 ionic or covalent? Covalent
What is the name of PF5? Phosphorus Pentafluoride
Is Nitrogen Trihydride ionic or covalent? Covalent
What is the formula for Nitrogen Trihydride? NH3
Is Tricarbon Decaoxide ionic or covalent? Covalent
What is the formula for Tricarbon Decaoxide? C3010
What is a physical property? Color, hardness, or boiling point
What is a chemical property? Flammability, toxicity, heat or combustion
Why is flammability a chemical property instead of a physical property? It involves a chemical reaction between a substance and oxygen, resulting in the formation of a new chemical substance
List the signs that a chemical reaction has taken place Makes something new, change in odor, formation of bubbles, change in order, formation of a precipitate, warming or cooling etc
What is an exothermic reaction? (example) Release energy in the form of heat (THEY GET HOT); hand warmer
What is an endothermic reaction? (example_ Absorb energy in the form of heat (THEY GET COLD); instant cold pack
What does the law of conservation of mass/matter state? Matter/Mass can neither be created nor destroyed during chemical reactions
Why do chemical equations need to be balanced? So that is follows the law of conservation of mass
What do the coefficients in a balanced chemical equation represent? The number of each substance involved in the reaction
What do the subscripts in a balanced chemical equation represent? The number of atoms
What can be changed when balancing a chemical equation? The coefficients
Where are the products in a chemical equation? On the right
Where are the reactants in a chemical equation? On the left
How are the physical state of reactant and products indicated when writing chemical equations? (s), (l), and (g)
What is a synthesis reaction? 2 or more substances combined to form 1 product
What is the general formula for a synthesis reaction? A+B=AB
What is a decomposition reaction? 1 substance breaks up into 2 or more substances
What is the general AB=A+B
What is a single displacement reaction? 1 element replaces another element in a compound
What is the general formula for a single displacement reaction? AB+C=AC+B
What is a double displacement reaction? 2 elements in different compounds switch places
What is the general formula for double displacement reaction? AB+CD=AD+CB
Created by: sp18
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