Chemical Equations and Reactions

Question 1

chemical reaction

Answer 1

process by which 1 or more substances are changed into 1 or more different substances

Question 2

reactant

Answer 2

original substance in a chemical reaction

Question 3

product

Answer 3

resulting substance in a chemical reaction

Question 4

chemical equation

Answer 4

represents (with symbols and formulas) the identities and relative amounts of the reactants and products in a chemical reaction

Question 5

indications of a chemical reaction

Answer 5

evolution of heat and light

production of a gas

formation of a precipitate

color change

Question 6

precipitate

Answer 6

solid formed within a solution and produced as a result of a chemical reaction

Question 7

coefficient

Answer 7

small whole number that appears in front of a formula in a chemical equation

indicates relative (not absolute) amount of a reactant or product

Question 8

word equation

Answer 8

equation in which the reactants and products in a chemical reaction are represented by words

has only qualitative meaning

Question 9

formula equation

Answer 9

equation which represents the reactants and products of a chemical reaction by their symbols or formulas

needs to be balanced in order to be deemed “complete”

Question 10

→

Answer 10

signifies “yields” in a chemical equation

Question 11

⇄

Answer 11

signifies “yields” in a chemical equation

used in place of a single arrow to indicate a reversible reaction

Question 12

(s)

Answer 12

signifies “solid” or “precipitate” in a chemical equation

placed adjacent to a reactant or product

Question 13

(l)

Answer 13

signifies “liquid” in a chemical equation

placed adjacent to a reactant or product

Question 14

(aq)

Answer 14

signifies “aqueous” in a chemical equation

placed adjacent to a reactant or product

Question 15

(g)

Answer 15

signifies “gaseous” in a chemical equation

placed adjacent to a reactant or product

Question 16

Δ

Answer 16

signifies “heat” in a chemical equation

placed directly above “→”

Question 17

catalyst

Answer 17

substance that changes the rate of a chemical reaction

can only be recovered unchanged

Question 18

reversible reaction

Answer 18

chemical reaction in which the products re-form the original reactants

Question 19

synthesis reaction

composition reaction

Answer 19

chemical reaction in which 2 or more substances combine to form a new compound

Question 20

decomposition reaction

Answer 20

chemical reaction in which a single compound produces 2 or more simpler substances

Question 21

electrolysis

Answer 21

decomposition of a substance by an electric current

Question 22

single-replacement reaction

displacement reaction

Answer 22

chemical reaction in which 1 element replaces a similar element in a compound

Question 23

product of chemical reaction between reactive metals (found in group 1 or group 2) and water

Answer 23

metal hydroxide and hydrogen

Question 24

product of chemical reaction between non-reactive metals (not found in group 1 or group 2) and steam

Answer 24

metal oxide and hydrogen

Question 25

double-displacement reaction

Answer 25

chemical reaction in which the ions of 2 compounds exchange places in an aqueous solution to form 2 new compounds

Question 26

combustion reaction

Answer 26

chemical reaction in which a substance combines with oxygen and large amounts of energy are released in the form of light and heat

Question 27

activity

Answer 27

ability of an element to react

Question 28

activity series

Answer 28

list of elements organized according to ease with which the elements undergo certain chemical reactions used to help predict which chemical reactions will occur