H Chemistry: Unit 5

Question 1

chemical reaction

Answer 1

process where atoms are rearranged to form new substances

Question 2

chemical equation

Answer 2

mathematical expression of a chemical reaction

Question 3

word equation

Answer 3

chemical equation where the compound or element names are used

Question 4

skeleton equation

Answer 4

chemical equation where symbols are used to represent chemical species

Question 5

balanced chemical equation

Answer 5

chemical equation that uses symbols and coefficients to completely describe a chemical reaction

Question 6

synthesis reaction

Answer 6

reaction where the product is more complex than the reactants

Question 7

decomposition reaction

Answer 7

reaction where the reactant is more complex than the product

Question 8

combustion reaction

Answer 8

exothermic reaction where 02 is a reactant

Question 9

combustion of a hydrocarbon or carbohydrate always produces

Answer 9

CO2 + H2O

Question 10

single displacement reaction

Answer 10

reaction where an element will replace another element in a compound

Question 11

activity series

Answer 11

list of elements in order of reactivity; if an element is above another, then it will replace it in a compound

Question 12

double displacement reaction

Answer 12

reaction where ions are exchanged forming a gas, a salt, water, or a precipitate

Question 13

precipitate

Answer 13

ppt; solid that comes out of a solution

Question 14

mole

Answer 14

mol; SI unit for an amount of something

Question 15

Avogadro’s Number

Answer 15

6.022 x 10^23

Question 16

molar mass

Answer 16

mass in grams of 1 mole of any substance

Question 17

percent composition

Answer 17

ratio of the mass of an element to the mass of the compound it is in; expressed as a percentile

Question 18

empirical formula

Answer 18

chemical formula that has elements in the smallest whole number ratios

Question 19

molecular formula

Answer 19

molecular formula where the actual number of atoms in the compound is expressed

Question 20

hydrate

Answer 20

ionic compound loosely bonded to water molecules

Question 21

anhydrous salt

Answer 21

hydrate after the water has been removed

Question 22

hydrate problem: mass of water

Answer 22

before heating - after heating

Question 23

hydrate problem: mass of anhydrous salt

Answer 23

after heating - crucible