Chapter 8 Flashcards
chem 101 chap 8
Fast-moving molecules
Hot
Slow moving molecules
Cold
A change that releases heat is called an
A. endothermic process
B. exothermic process
exothermic process
A change that absorbs heat is an
A. endothermic process
B. exothermic process
endothermic process
Baking Bread
endothermic process (Gains Heat)
Making an ice cube
exothermic process (Loss Heat)
The SI unit of heat, work, and energy is the
joule (J)
A calorie is the amount of energy required to raise one gram of water by __ Kelvin.
1
1 calorie = ___ joules
4.184
An _________ property is a property that depends on the amount of matter in a sample
A. extensive
B. intensive
extensive
An _________ property is a property of matter that depends only on the type of matter in a sample and not on the amount.
A. extensive
B. intensive
intensive
Specific heat capacity is an ________ property
intensive
The amount of heat, q, entering or leaving a substance can be calculated.
If a substance gains thermal energy, then the value of q is…
positive
The amount of heat, q, entering or leaving a substance can be calculated.
If a substance loses thermal energy, then the value of q is…
negative
If the reaction is ________, the heat produced by the reaction is absorbed by the solution
exothermic
If the reaction is ________, the heat required for the reaction to occur is provided by the solution.
endothermic
If ΔH = 54.74 kJ for a chemical reaction, that reaction is
endothermic
If ΔH is negative, it indicates that the reaction is _________
exothermic
Bomb calorimetry is carried out at _____.
A. constant-volume
B. constant-pressure
C. constant-mass
D. constant temperature
A. constant-volume
Your task is to measure the amount of energy evolved during the metabolism. Which of the
following would be the ideal technique for this experiment?
A. coffee-cup calorimetry
B. bomb calorimetry
C. bomb manometry
D. whole-body calorimetry
D. whole-body calorimetry
A reaction where the products are higher in energy than the reactants is an example of an _____.
endothermic process
An _____ reaction results when the energy required to break bonds in the reactants is greater than the energy released by the formation of products.
endothermic
An _____ reaction results when the energy released by the formation of products is greater than the energy required to break the bonds in the reactants.
exothermic
