Ch. ... Vocab

Question 1

The minimum amount of energy required to start a chemical reaction

Answer 1

Activation energy

Question 2

A solid in which the particles are not arranged with periodicity or order

Answer 2

Amorphous acid

Question 3

A molecule in an unstable state intermediate to the reactants and the products in the chemical reaction

Answer 3

Activated complex

Question 4

The conversion of a liquid to a vapor within the liquid as well as the surface of the liquid at a specific temperature and pressure

Answer 4

Boiling

Question 5

The temperature and pressure at which a liquid and gas are in equilibrium

Answer 5

Boiling point

Question 6

A device used to measure the energy as heat absorbed or released in a chemical or physical change

Answer 6

Calorimeter

Question 7

The attraction of the surface of a liquid to the surface of a solid, which causes the liquid to rise or fall

Answer 7

Capillary action

Question 8

A substance that changes the rate of a chemical reaction without being consumed or change significantly

Answer 8

Catalyst

Question 9

The theory that states that the number of new compounds formed in a chemical reaction is equal to the number of molecules that collide, multiplied by a factor that corrects for low-energy collisions

Answer 9

Collision theory

Question 10

A change of state from a gas to a liquid

Answer 10

Condensation

Question 11

The temperature and pressure at which the gas and liquid states of a substance become identical a form one phase

Answer 11

Critical point

Question 12

The lowest pressure at which a substance can exist as a liquid at the critical temperature

Answer 12

Critical pressure

Question 13

The temperature above which a substance cannot exist in the liquid state

Answer 13

Critical temperature

Question 14

A solid whose atoms, ions, or molecules are arranged in a definite pattern

Answer 14

Crystal

Question 15

The arrangement of atoms, ions, or molecules in a regular way to form a crystal

Answer 15

Crystal structure

Question 16

A solid that consist of crystals

Answer 16

Crystalline solid

Question 17

The change of state from a gas directly to a solid

Answer 17

Deposition

Question 18

The movement of particles from regions of higher density two regions of lower density

Answer 18

Diffusion

Question 19

The passage of a gas under pressure through a tiny opening

Answer 19

Effusion

Question 20

A collision between ideally elastic bodies in which the final initial Connecticut energies are the same

Answer 20

Elastic collision

Question 21

The amount of energy released word sort is heat by a system during a process at constant pressure

Answer 21

Enthalpy change

Question 22

The energy released as heat by the complete combustion of a specific amount of a substance at constant pressure or constant volume

Answer 22

Enthalpy of combustion

Question 23

The amount of energy released or observed as heat during a chemical reaction

Answer 23

Enthalpy of reaction

Question 24

The state in which a chemical reaction in the reverse chemical reaction occurr at the same rate such that the concentrations of reactants and products do not change

Answer 24

Equilibrium

Question 25

The vapor pressure of a system at equilibrium

Answer 25

Equilibrium vapor pressure

Question 26

The process by which particles escape from the surface of from a boiling liquid and enter the gas state

Answer 26

Evaporation

Question 27

A non-solid state of matter in which the atoms or molecules are free to move past each other, as in a gas or liquid

Answer 27

Fluid

Question 28

The change of state in which a liquid becomes a solid as energy as heat is removed

Answer 28

Freezing

Question 29

The temperature at which a solid and liquid are in equilibrium at one ATM pressure

Answer 29

Freezing point

Question 30

The energy transferred between objects that are at different temperatures

Answer 30

Heat

Question 31

The overall enthalpy change in a reaction is equal to the sum of the enthalpy changes for the individual steps in the process

Answer 31

Hess's law

Question 32

A reaction in which all of the reactants and products are in the same phase

Answer 32

Homogeneous reaction

Question 33

An imaginary guess whose particles are infinitely small and do not interact with each other

Answer 33

Ideal gas

Question 34

A substance that forms in the middle stage of a chemical reaction

Answer 34

Intermediate

Question 35

The unit used to express energy

Answer 35

Joule

Question 36

A theory that explains that the behavior of physical systems depends on the combined actions of the molecules constituting the system

Answer 36

Kinetic molecular theory

Question 37

The change of state in which a solid becomes a liquid by adding energy as heat or changing pressure

Answer 37

Melting

Question 38

The temperature and pressure at which a solid becomes a liquid

Answer 38

Melting point

Question 39

The amount of energy as heat resulting from the formation of one mole of a substance at constant pressure

Answer 39

Molar enthalpy of formation

Question 40

The amount of energy as heat required to change one mole of a substance from solid to liquid at constant temperature and pressure

Answer 40

Molar enthalpy of fusion

Question 41

The amount of energy as heat required to evaporate one mole of a liquid at constant pressure and temperature

Answer 41

Molar enthalpy of vaporization

Question 42

One of the four states or condition in which a substance can exist

Answer 42

Phase

Question 43

A graph of the relationship between physical state of a substance in the temperature and pressure of the substance

Answer 43

Phase diagram

Question 44

The way in which A chemical reaction takes place. Expressed in a series of chemical equations

Answer 44

Reaction mechanism

Question 45

A gas that does not behave completely like a hypothetical ideal gas because of the interactions between the gas molecules

Answer 45

Ideal gas

Question 46

The quantity of heat required to raise a unit mass of homogeneous material 21 Kelvin or 1°C in a specified way given constant pressure and volume

Answer 46

Specific heat

Question 47

The process in which a solid changes directly into a gas

Answer 47

Sublimation

Question 48

A liquid that is cool blue it's normal freezing point without solidifying

Answer 48

Supercooled liquid

Question 49

The force that acts on the surface of a liquid and that tends to minimize the area of the surface

Answer 49

Surface tension

Question 50

A measure of how hot or cold something is

Answer 50

Temp.

Question 51

And equation that includes the quantity of energy as heat released or absorbency during the reaction as written

Answer 51

Thermochemical equation

Question 52

A branch of chemistry that is the study of the energy changes that accompany chemical reactions and changes of state

Answer 52

Thermochemistry

Question 53

The temperature and pressure conditions at which the solid, liquid, and gaseous phases of a substance coexist at equilibrium

Answer 53

Triple point

Question 54

The smallest portion of a crystal lattice that shows the 3-D pattern of the entire lattice

Answer 54

Unit cell

Question 55

The process by which a liquid or solid changes to a gas

Answer 55

Vaporization

Question 56

A liquid that evaporates readily or at a low temperature

Answer 56

Volatile liquid