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Chemistry Honors > Energy > Flashcards

Energy Flashcards

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1
Q

Quantitative transfers

A

Heat of fusion (melting)
Heat of vaporization (boiling)
Eth: specific heat capacity

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2
Q

Ech

A

Energy stores int he bonds between particles. This is not seen on a heating curve, but only changes during a chemical reaction

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3
Q

Heating

A

-Occurs when collisions of particles causes an increase in molecular movement. An example of this would be the melting of ice when you put it in warm soda

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4
Q

Radiating

A

Occurs when energy is transferred from a glowing source giving off photons. Snow melting off your roof in sunlight would be an example.

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5
Q

Q=(delta Hv)(m)

Heat of vaporization times mass

A

Formula for evaporation/boiling/condensing phase change

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6
Q

When is the heating curve flat and why

A

WHEN: boiling, melting, evaporating, condensing
WHY: energy add is stored in the phase (Eph) rather than thermally (Eth), so temperature does not change

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7
Q

What is the heat of vaporization

A

The amount of energy required to boil/evaporate 1 gram of a substance. It can be used to calculate how much energy would be needed to boil a certain amount of a sample.

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8
Q

Formula for boiling

A

Heat of vaporization times mass

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9
Q

Energy symbol and unit

A

Q

-Joules or calories

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10
Q

What is heat of fusion

A

-The amount of energy required to melt 1 gram of a substance and can be used to calculate how much energy would be needed to melt a certain amount of sample.

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11
Q

Energy is energy meaning

A
  • The method of storage doesn’t matter
  • Energy can be transferred
  • Energy can be stored in different ways
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12
Q

Heating curves

A
  • Up when solid
  • Flat melting and freezing
  • Up when liquid
  • Flat boiling and condensing
  • Up as a gas
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13
Q

Melting for freezing formula

A

Q=(Delta Hf)(m)

Heat of fusion times M

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14
Q

Eth

A

Energy stored in the speed of the particles. This changes as you increase the temperature of a solid, liquid, or gas. It would change in the slanted sections of a heating curve

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15
Q

What two formulas are for phase changes

A

The ones with delta H something

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16
Q

Formula for melting

A

Q=(Delta Hf)(m)

Heat of fusion times M

17
Q

Formula for freezing

A

Q=(Delta Hf)(m)
Heat of fusion times M
Energy should be negative bc energy is leaving the system

18
Q

Q=(Delta Hf)(m)

Heat of fusion times M

A

Formula for melting or freezing phase change

19
Q

Formula for condensing

A

Q= Heat of vaporization times mass

Energy should be negative bc energy is leaving the system

20
Q

Formula for evaporating

A

Q= (Heat of vaporization times mass

21
Q

Transferring energy (2 component systems) rules

A

Energy in + energy out-> the amount of energy gained by one component in the system should be equal (in a perfect system) to the amount of energy lost by the other component

Tf(final temperature)-> the final temperature of both components should be the same. Amount of energy stored thermally will be identical. Energy transfer until there is equal amount of energy storage, like ice sub in water

22
Q

Temperature definition

A

A measure of energy stored in the motion of particles

23
Q

What is energy

A

A conserved (same amount beginning and end) substance- like (stuff- like) quantity (measurable) with the capacity (can make things happen) to change

24
Q

Working

A

Occurs when one object exerts force on another object. These occur on a level easily seen. So pushing a couch or desk across the floor would be considered work.

25
Q

Particle pictures in Real Life (paragraph format)

A
  • Talk about collisions only when comparing gas and gas
  • Liquid and solid particles are just as close together (touching and close), the particles of solids are uniformly packed and thus more dense while liquid particles are not uniformly packed and are less dense
  • Use the other thing taught for particle pictures
26
Q

What is specific heat capacity

A

Symbol is C
The amount of energy required to increase the temperature of 1 gram of a substance by 1 degree Celsius. Used when the temperature is changing. So it can be used to calculate the amount of energy needed to heat a solid, liquid, or gas to a certain temperature

27
Q

Regular heating problem formula

A

Q= (m)(delta T)(C)

Mass times temperature change (-/+) times specific heat

28
Q

How is energy transferred (physically)

A
  • Working
  • Heating
  • Radiating
29
Q

Eph

A

Energy stored in the arrangemtn of particles. This changes as the substance undergoes a phase change (melting, boiling, etc). It would change in the flat/horizontal sections of the heating curve.

30
Q

Evaporating/boiling/condensing formula

A

Q=(delta Hv)(m)

Heat of vaporization times mass

31
Q

In what ways can energy be stored

A

Eth
Eph
Ech

Chemistry Honors (5 decks)

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