OpenStax Chapter 5 Flashcards Preview

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Flashcards in OpenStax Chapter 5 Deck (35):
1

What is thermochemistry?

the amount of heat absorbed or produced during a reaction

2

Energy

capacity to supply heat or do work

3

work

process of causing matter to move against an opposing force

4

potential energy

the energy an object has because of its position

5

kinetic energy

the energy that an object possesses because of its motion

6

Can energy be converted from one form to another?

yes

7

what is the first law of thermodynamics?

energy cannot be created or destroyed

8

thermal energy

kinetic energy associated with the random motion of atoms and molecules

9

temperature

measure of hot or cold

10

what letter in equations is used for heat? (How is heat represented?)

Q

11

exothermic change

change that releases heat

12

endothermic reaction

reaction that absorbs heat

13

how is energy measured? (HINT - begins with c(

calorie

14

what is something else other than calorie used to measure energy?

joule

15

How do you find heat capacity (C)? ( What is the equation?

C = q/(delta)T

16

what is the specific heat capacity equation?

c = q/m(delta)T

17

what is the specific heat of water?

4.184

18

What is the equation for finding heat when specific heat and mass is known?

q = (specific heat (c))x(Mass (m))x(temperature change (deltaT)

19

what is calorimetry used for?

measuring heat transferred from one substance to another

20

what is a system?

the part undergoing the change

21

the surroundings

everything outside of the reaction

22

calorimeter

used to measure the amount of heat involved in a reaction

23

are the reactants/products or the reaction/solution an inverse relationship?

yes

24

bomb calorimeter

used when yield is high

25

nutritional calorie (C) is equal to?

1000 calories or 1 kcal

26

chemical thermodynamics

relationships between heat work and other energy

27

substances act as reservoirs of what?

energy

28

total of all possible types of energy is called the

internal energy (U)

29

the relationship between internal energy heat and work is represented by the equation

(delta)U = q(heat)+w(work)

30

expansion work

when a system pushes back against the surroundings

31

Enthalpy (H)

descriptor of the thermodynamics of a reaction

32

the equation for enthalpy change is

(delta)H = (change)U(energy)+PV

33

heat of combustion

the change in H when 1 mol is burned

34

hydrocarbon

compound made only of hydrogen and carbon

35

what is an equation for hess law? (the special one with sigma)

deltaH = sigma(n)xdeltaHf(products) - same but with reactants