Thermochemistry

In an exothermic process the surrounding looses heat. 

• True
• False

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

In an endothermic reaction the system is releasing energy.

• True
• False

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Is the combustion of gasoline endothermic or exothermic?

• Endothermic
• Exothermic

Tags

NGSS.HS-PS1-4

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

A reaction is performed in a beaker with a temperature probe recording the temperature changes of the reaction.  If the temperature began at 15.0 degrees Celsius and ended at 27.5 degrees Celsius.  If the reaction is our system, is the system endothermic or exothermic?

• Exothermic
• Endothermic

Tags

NGSS.HS-PS1-4

Refer the the following question:
2N₂ + 3H₂ --> 2NH₃ + 46 kJ
How much energy would be produced if only 1 mol of nitrogen was reacted?

• 92 kJ
• 0.143 kJ
• 23 kJ
• 15 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

How much energy must be used to produce 4.75 mol of gaseous water?
H₂O (l) +  44.0 kJ --> H₂O (g)

• 207 kJ
• 9.36 kJ
• 206.8 kJ
• 9.362 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What mass of P₄ must be reacted to produce 5905 kJ of energy?
P₄ + 6Cl₂ --> 4PCl₃ + 2439 kJ

• 25.43 g
• 563.0 g
• 2.421 g
• 300.0 g

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-7

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

• Higher
• Lower

Tags

NGSS.HS-PS1-4

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

• Higher
• Lower

Tags

NGSS.HS-PS1-4