Chemical Equations & Reactions

Question 1

The process by which one or more substances change to produce one or more different substances. Different chemical and physical properties.

Answer 1

Chemical Change

Question 2

Are used to write a chemical reaction

Answer 2

Chemical Changes

Question 3

Reactants

Answer 3

Products

Question 4

Mass and atoms are

Answer 4

Conserved

Question 5

Physical Change is not a

Answer 5

Chemical Change

Question 6

Examples of a Physical Change

Answer 6

State, Evaporation, Condensation, Melting & Freezing

Question 7

Representation of a chemical reaction that uses symbols to show relationship between reactants and products.

Answer 7

Chemical Equation

Question 8

Relative amounts of reactants and products

Answer 8

Chemical Equation

Question 9

Just the names of reactants and products, qualitative not quantitative

Answer 9

Word Equation

Question 10

Indicates quantitative amounts of reactants and products, states of each, temperature, pressure and net energy flow.

Answer 10

The Balanced Checmical Equation

Question 11

nitrogen reacts with hydrogen to produce ammonia

Answer 11

Example Word Equation

Question 12

(s)

Answer 12

Solid

Question 13

(l)

Answer 13

Liquid

Question 14

(g)

Answer 14

gas

Question 15

(aq)

Answer 15

Aqueous (dissolved in H2O)

Question 16

<===>

Answer 16

Reversable Reaction

Question 17

<===>

Answer 17

Reversable Reaction

Question 18

Reactions ______ atoms

Answer 18

Conserve

Question 19

During reactions, # and kinds of atoms are the same, tey are just rearranged (balanced).

Answer 19

Reactions conserve Atoms

Question 20

_____ for chemical formulas are determined by _____ states and cannot be _______

Answer 20

Subscripts, oxidation, changed

Question 21

Subscripts for chemical formulas are determined by oxidation states and cannot be changed

Answer 21

Balance Equations

Question 22

____ and ____ of atoms have to be equal on both sides of equations

Answer 22

and Type

Question 23

and Type of atoms have to be equal on both sides of equations

Answer 23

Balance Equations

Question 24

—-> ‘Yield’ sign also means

Answer 24

equal

Question 25

Balance equation with __________ (small whole numbers in ________ of cpds) and ________ be changed until the reaction is balanced

Answer 25

Coefficients, Front, Can

Question 26

3 Steps to Balance a Chemical Equation

Answer 26

1) Identify reactants and products and write a correct formula for each (exidation # and subscripts) 2) Count atoms and insert coefficients to balance 3) Double checks NOTE: Polyatomic ions that do not break apart can be counted as a single unit

Question 27

Used to help predict products

Answer 27

Reaction Types

Question 28

Oxidation reaction of an organic compound, heat is released

Answer 28

Combustion Reaction

Question 29

2 or more substances combine to form a new cpd (one product)

Answer 29

Synthesis Reaction

Question 30

Opposite of Synthesis reaction

Answer 30

Decomposition Reaction

Question 31

Single cpd breaks down to form two or more simpler substances

Answer 31

Decomposition Reaction

Question 32

Single element reacts with a cpd and displaces an element from the cpd

Answer 32

Single Replacement / Displacement

Question 33

a list of elements that have similar properties and arranged in descending order of chemical activity

Answer 33

Activity series

Question 34

Metal or Hydrogen replaces metal, non-metal replaces a non-metal

Answer 34

Single Replacement / Displacement

Question 35

A more active element (single element) replaces a less active element (in a cpd)

Answer 35

Single Replacement / Displacement

Question 36

Oxidation is the loss of electrons

Answer 36

OIL

Question 37

The reduction is the gain of electrons

Answer 37

RIG

Question 38

An exchange of ions between two aqueous cpds in which a gas, solid or molecule cpd is formed

Answer 38

Double Replacement/Displacement

Question 39

Everything is included

Answer 39

Total Ionic Equation

Question 40

Equation that quantitatively represents those atoms, ions or molecules that undergo a chemical change

Answer 40

Net Ionic Equation

Question 41

Ions that are present in a solution in which they do not participate in the chemical change

Answer 41

Spectator Ions

Question 42

4 Steps for Writing net iconic equations

Answer 42

1) Write a balance equation indicating that phase of each product 2) Separate aqueous compounds 3) Remove spectators ions, indicate # of ions or products, state and oxidation #. (use sol, rules to determine ppt) 4) Write net - # and type of atoms must be balanced.

Question 43

The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change

Answer 43

1) color chage (drastic) 2) formation of a precipitate 3) formation of a gas 4) odor change (release an odor) 5) temperature change

Question 44

Evidence of a Chemical Change

Answer 44

1) Change E: Released as heat, light, product sound, change temperature, and change in electrical E 2) Formation of a new Substance: a) Formation of a gas b) Precipitate 3) Change in color (drastic) and release an odor