General Chemistry 2

Question 1

The study Of energy or heat Flow that accompanies a chemical reaction and/or physical transformation

Answer 1

THERMOCHEMISTRY

Question 2

a Form Of energy transfer between two objects as a result of their difference in temperature

Answer 2

HEAT

Question 3

the part of the universe being studied or to which attention Is Focused

Answer 3

SYSTEM

Question 4

include everything else in the universe

Answer 4

SURROUNDING

Question 5

Heat is represented by this letter

Answer 5

q

Question 6

heat flows From a system to its surroundings; - q

Answer 6

EXOTHERMIC

Question 7

system absorbs heat From surroundings; +q

Answer 7

ENDOTHERMIC

Question 8

a branch of thermodynamics, which deals with the interconversion of energy between two forms: heat & work

Answer 8

THERMOCHEMISTRY

Question 9

States that energy can neither be created nor destroyed, It can only be transferred between the system and surroundings

Answer 9

LAW OF CONSERVATION OF ENERGY

Question 10

Based on the first law of thermodynamics, the equation on the change in energy Of a system

Answer 10

E = q + w

q = heat absorbed, w = work done

Question 11

Involves the measurement of the quantity of heat exchanged between a system and its surroundings

Answer 11

CALORIMETRY

Question 12

measures the Flow of energy (as heat) between the system and its surroundings

Answer 12

CALORIMETRY

Question 13

The amount of heat absorbed or released by the system is a function of its change in temperature

Answer 13

q = C∆t

q = heat (J)
∆t = change in temp. (°C)

Question 14

Proportionality constant that shows the relationship between heat and temp. change. Also the amount of energy needed to raise the temp. of a substance by 1°C. (J/°C)

Answer 14

Heat Capacity (C)

Question 15

Heat Capacity is equal to the product of its _____ and _____.

Answer 15

mass (m), specific heat (c)

C = mc

Question 16

The amount of energy needed to increase the temp. of one gram of a substance by 1°C. (J/g°C). Also, it is constant for some substances.

Answer 16

Specific Heat (c)

Question 17

An insulator apparatus that contains water or liquid of known heat capacity. It determines the heat capacity of a substance.

Answer 17

Calorimeter

Question 18

The System of a Calorimeter is composed of two parts:

Answer 18

Substance and Chemical Reaction

Question 19

Heat exchange in a calorimeter is expressed as (when the calorimeter is an excellent insulator and absorbs only a negligible amount of heat)?

Answer 19

q (sys) = - q (water)

or

q (sys) = - mc∆t (water)

Question 20

A typical calorimeter used in experimentation which is usually made with a polystyrene cup that is a good insulator.

Answer 20

Coffee-Cup Calorimeter

Question 21

Parts of a Coffee-Cup Calorimeter

Answer 21

Thermometer and Stirrer

Question 22

Total Heat Transferred (absorbed or released) in a chemical reaction at constant pressure, and often referred to as Heat Content.

Answer 22

Enthalpy (H)

Question 23

A Balanced Equation that also specifies Heat Flow for the reaction.

Answer 23

Thermochemical Equations

Question 24

Expresses a quantitative relationship between the amounts of substances that react and the heat of the reaction

Answer 24

Thermochemical Equations

Question 25

In writing a Thermochemical Equation, where is the heat flow listed beside the balanced chemical equation?

Answer 25

In the right side

aA + bB —> cC ∆H = ___kJ

Question 26

___ is directly proportional to the quantity of a substance that reacts or is produced by the reaction. If the coefficients in an equation are doubled, the value of ___ is multiplied by 2.

Answer 26

∆H

Question 27

∆H that accompanies a chemical reaction; is the net energy change resulting from the breaking and formation of bonds.

Answer 27

Heat of Reaction

Question 28

The Heat of reaction can be solved using the equation:

Answer 28

∆H°rxn = Σ∆H°f (products) - Σ∆H°f (reactants)

Question 29

The change in enthalpy when the compound was formed from its elements under standard conditions.

Answer 29

Enthalpy of Formation