Physical Chemistry

what is the unit of 1st order rate constant?

• mol/lit/sec

• per secmol2/lit2/sec

• per sec

• mole/lit

What two factors govern whether a collision between reacting particles will be effective?

• orientation and potential energy 
• kinetic energy and temperature 
• kinetic energy and orientation 
• potential energy and kinetic energy 

Under the collision theory, the particles must collide with  ____ and ____ for a reaction to occur.

• sufficient rate and sufficient energy
• sufficient surface area and correct orientation
• sufficient catalyst and sufficient energy
• sufficent energy and correct orientation

Reaction rate means...

• amount of product formed
• speed of reaction
• concentration of reacting particles
• combining reactants with products

Tags

NGSS.HS-PS1-5

Which of the following increase the reaction rate?

• less surface area
• lower temperature
• an inhibitor
• increased concentration

Tags

NGSS.HS-PS1-5

Which of the following is NOT a factor affecting reaction rate?

• temperature

• catalysts

• concentration

• polarity

Tags

NGSS.HS-PS1-5

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

• Higher

• Lower

Tags

NGSS.HS-PS1-4

The first law of thermodynamics states that the change in the internal energy of a system is equal to the difference in energy transferred to or from the system as heat and

• mass
• work done
• force
• pressure

Which best describes ENTROPY?

• Useful heat energy needed to drive an engine
• Heat that can be stored to be used at a later date
•   Random energy that escapes from the system
• A state of order in a physical system

Tags

NGSS.HS-PS3-4

Which state of H₂O  has the greatest entropy?

• Ice
• Water
• Vapor