Heat Capacity / Enthalpy

Solid

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Tags

NGSS.MS-PS1-1

Liquid

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Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Gas

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Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-4

If you have ever been to the beach you will find that the sand heats up and cools down faster than the water. 

The Specific Heat of water is 4184 J / kg °C and the Specific Heat of sand is 664 J / kg °C.

Which two statements are TRUE?

• The sand heats up and cools down faster than water because the specific heat is smaller than water

• The sand heats up and cools down faster than water because the specific heat is larger than water

• ​ the particles in sand can speed up and slow down slower than water particles.​

• the particles in sand can speed up and slow down faster than water particles.​

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

If you have ever been to the beach you will find that the sand heats up and cools down faster than the water. 

The Specific Heat of water is 4184 J / kg °C and the Specific Heat of sand is 664 J / kg °C.

Which two statements are TRUE?

• ​ Sand particles have SMALLER changes in enthalpy​...

• Sand particles have LARGER changes in enthalpy...

• ​...because sand particles require LESS heat

• ...because sand particles require MORE heat

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

If you have ever been to the beach you will find that the sand heats up and cools down faster than the water. 

The Specific Heat of water is 4184 J / kg °C and the Specific Heat of sand is 664 J / kg °C.

Which two statements are TRUE?

• ​Based on the heat capacity SAND is a better insulator​...

• ​Based on the heat capacity WATER is a better insulator​..

• ​...​because it has SMALLER  changes in enthalpy​

• ​...​because it has LARGER  changes in enthalpy

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

If you have ever been to the beach you will find that the sand heats up and cools down faster than the water. 

The Specific Heat of water is 4184 J / kg °C and the Specific Heat of sand is 664 J / kg °C.

Which two statements are TRUE?

• ​An insulator ​ takes LESS heat to heat up and cool down.​..

• ​An insulator ​ takes MORE heat to heat up and cool down.​..

• ​...This means that these particles have steady KINETIC

   energy.​

• ...​This means that these particles have steady  CHEMICAL

   energy.​

• ​...This means that these particles have steady 

  MECHANICAL

   energy

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Temperature is defined as...

• average kinetic energy of the molecules

• how hot or cold something is

• speed and direction of molecules

• none of these

Enthalpy is defined as the...

• total heat and how it moves in a system

• mechanical energy from a chemical reaction

• amount of heat required to reduce the temperature of one gram of a substance by one degree Celsius.​

• amount of heat required to raise the temperature of one gram of a substance by one degree Celsius.​

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

​Cold objects in a system will __1__ heat which means the enthalpy will be __2__ and the particles will __3__ movement. ​

• 1) ​release

  2) negative

  3) decrease

• ​1) release

  2) positive

  3) decrease

• 1) ​absorb

  2) positive

  3) increase

• 1) ​absorb

  2) positive

  3) decrease

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4