Thermochemistry Intro

If two objects have different temperatures, heat will flow from the warmer object to the cooler one UNTIL ____________

• one reaches a temperature of zero

• they both have an equal temperature

• one runs out of energy

Tags

NGSS.HS-PS3-4

What kind of reaction is this?

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

The release of chemical potential energy produces all of the following except:

• heat

• work

• motion

• cooling

Chemicals in gasoline contain a large amount of potential energy because:

• there are many compounds present in gasoline

• gasoline components carry out several reactions

• gasoline is very volatile

• there are many chemical bonds present

Tags

NGSS.HS-PS1-4

A unit of heat is the ________

• joule/sec

• joule/kg

• joule

• joule · gram/sec

Tags

NGSS.HS-PS3-4

Thermal energy always moves:

• From a high temperature object to a lower temperature object.

• From a lower temperature object to a higher temperature object.

• From an object with lower kinetic energy to an object with higher kinetic energy.

• From an object of higher mass to an object of lower mass.

Tags

NGSS.HS-PS3-4

In an exothermic process the surrounding looses heat. 

• True

• False

Tags

NGSS.HS-PS3-4

In an endothermic reaction the system is releasing energy.

• True

• False

As someone is running on the track they begin to perspire.  If the runner is our system, are they endothermic or exothermic?

• Endothermic process

• Exothermic process

Tags

NGSS.HS-PS3-4

Do the reactants in an exothermic reaction have a higher or lower energy than the products?

• Higher

• Lower

Tags

NGSS.HS-PS1-4