9.1-9.2 test/exam

Question 1

energy

Answer 1

capacity to supply heat or do work

Question 2

1 Joule (SI Unit) =

Answer 2

1 kg·m^2/s^2

Amount of energy used when a force of 1 Newton moves an object 1 m

Question 3

1 calorie (cal) = 4.184 joules (J)

Answer 3

Amount of energy required to raise 1 g of water by 1°C

Question 4

1 Calorie (Cal) or kilocalorie (kcal) = 1000 cal = 4184 J

Answer 4

• Nutritional Calorie

Question 5

1 kilowatt-hour (kW∙h)

Answer 5

= 3.60 x 10^6 J

Question 6

A Watt is an

Answer 6

energy rate. 1 Watt = 1 J/s

Question 7

kinetic energy

Answer 7

energy an object passes due to motin

Question 8

potential energy

Answer 8

energy an object has due to positions ,compositions,or conditions

Question 9

kinetic energy ex

Answer 9

light-KE associated with transitions of photons

electrical-folw of electrons

thermal-KE associated with the random motion of atoms and molecules

Question 10

Potential energy ex

Answer 10

chemical- types of PE stored in molecule bonds

Nuclear-type of PE stored in the nucleus of an atom

Question 11

KE incesas so

Answer 11

1/2 mv^2 increases

Question 12

First Law of Thermodynamics
* Law of Conservation of Energy

Answer 12

• Total amount of energy in the
  universe is constant.
• Energy cannot be created or
  destroyed.

delta E(system)= -delta E(surroundngs)

Question 13

exothermic energy flow

Answer 13

system to surroundings
DeltaE(sys)<0(negative)
Delta E(surr)>0 (posotive)

-deltaE(system)=deltaE(surroundings)

Question 14

endothermic energy flow

Answer 14

surroundings to system
DeltaE(sys)>0(posotive)
Delta E(surr)<0 (negative)

delta E(system)=-delta E(surroundings)

Question 15

Heat (q)

Answer 15

Flow of energy caused by temperature difference
Poll

Question 16

Heat Capacity, C

Answer 16

extensive property (depend on amnt)
Quantity of heat a substance absorbs or releases when it
experiences a change temp by 1°C (or 1 K)
* Specific Heat Capacity, Cs
o Quantity of heat required to raise temp of 1 g of substance by 1°C
(or 1 K)
q= C* deta T

Question 17

Specific Heat Capacity, Cs

Answer 17

intensive propery ( indpendent of amnt)

Quantity of heat required to raise temp of 1 g of substance by 1°C
(or 1 K)

q=mCsdelta T