Thermochemistry

Question 1

What is thermochemistry

Answer 1

The study of relations between CHEMICAL REACTIONS and ENERGY

Question 2

What is MATTER

Answer 2

Anything having a MASS and occupying SPACE

Question 3

How is MATTER classified

Answer 3

by its STATE (liquid, solid, gas) and its COMPOSITION (heterogeneous mixture, element, compound, etc.)

Question 4

What is ENERGY

Answer 4

WORK of anything that can be produced by or converted into WORK

Question 5

What are the two classifications of ENERGY

Answer 5

POTENTIAL and KINETIC

Question 6

What is the formula for POTENTIAL ENERGY?

Answer 6

E(p) = mg(delta)h

Question 7

What is the formula for KINETIC ENERGY?

Answer 7

E(k) = [mv^2]/2

Question 8

What do E, v, m, g and h stand for?

Answer 8

E= energy, v=, m=, g=, h=.

Question 9

How many JOULES is one CALORIE?

Answer 9

1CALORIE = 4.184 JOULES

Question 10

What is the formula for ONE JOULE

Answer 10

kg*m^2/s^2

Question 11

What are the forms of POTENTIAL ENERGY? (4)

Answer 11

Gravitational, Chemical, Nuclear, Electrical

Question 12

What are the forms of KINETIC ENERGY? (2)

Answer 12

Motion, heat

Question 13

What is the relation between a SYSTEM, a BOUNDARY and SURROUNDINGS?

Answer 13

the SYSTEM is limited by the BOUNDARY. Outside of the BOUNDARY, there are SURROUNDINGS.

Question 14

What is an OPEN SYSTEM?

Answer 14

A SYSTEM that may exchange ENERGY and MATTER with SURROUNDINGS

Question 15

What is a CLOSED SYSTEM?

Answer 15

A SYSTEM that may NOT exchange MATTER ONLY with SURROUNDINGS

Question 16

What is an ADIABATIC SYSTEM?

Answer 16

A SYSTEM that may not exchange HEAT ONLY with SURROUNDINGS

Question 17

What is an ISOLATED SYSTEM?

Answer 17

A SYSTEM that an not exchange HEAT nor MATTER with surroundings.

Question 18

What is an ENDOTHERMIC PROCESS?

Answer 18

When there is ABSORPTION of ENERGY

Question 19

What is an EXOTHERMIC PROCESS?

Answer 19

When there is a RELEASE of ENERGY

Question 20

What is the formula for ENTHALPY?

Answer 20

(Delta)H = q(p)

Question 21

What do q and p stand for?

Answer 21

q = enthalpy (J/mol or kJ/mol) and p = constant pressure

Question 22

What INSTRUMENT is used to measure HEAT?

Answer 22

A CALORIMETER

Question 23

What is CALORIMETRY

Answer 23

The measurement of HEAT FLOW

Question 24

What is the sum of q’s always equal to?

Answer 24

Zero.

Question 25

What system is a CALORIMETER and its CONTENTS?

Answer 25

An ADIABATIC SYSTEM

Question 26

What is HEAT CAPACITY?

Answer 26

The amount of HEAT required to raise TEMPERATURE of a substance by 1K or 1C

Question 27

What is the formula for HEAT CAPACITY?

Answer 27

C = q/(delta)T

Question 28

What is the difference between HEAT CAPACITY and SPECIFIC HEAT CAPACITY?

Answer 28

SPECIFIC HEAT CAPACITY is for a SPECIFIC AMOUNT (g) of substance while HEAT CAPACITY is for an OBJECT

Question 29

What is the formula for SPECIFIC HEAT CAPACITY?

Answer 29

C = q/w(delta)T, w meaning weight (g)

Question 30

What is the standard enthalpy of formation of a compound?

Answer 30

The ENTHALPY CHANGE after the formation of 1 MOLE at 25C and 1 ATM from the elements in their standard state.

Question 31

What is the law of Lavoisier and Laplace

Answer 31

If we switch the sides of an equation, the enthalpy becomes the opposite sign.

Question 32

What is the enthalpy change for a chemical reaction ?

Answer 32

q = n(delta)h, n meaning number of moles.

Question 33

What is the delta H of any element equal to ?

Answer 33

Zero.