Thermochemistry Unit Review

The reaction container feels warm

• endothermic
• exothermic

Tags

NGSS.HS-PS1-4

∆H is positive

• endothermic
• exothermic

Tags

NGSS.HS-PS1-4

The products contain more energy than the reactants

• endothermic
• exothermic

Tags

NGSS.HS-PS1-4

Energy is absorbed by the system

• endothermic
• exothermic

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NGSS.HS-PS1-4

Exothermic reactions are reactions that

• release heat
• do not involve heat
• absorb heat
• take place instantaneously

Tags

NGSS.HS-PS1-4

Which of the following would NOT speed up a reaction?

• decreasing the temperature
• increasing the temperature
• lowering the activation energy
• stirring

Tags

NGSS.HS-PS1-5

A process that absorbs heat is a(n) ________ process.

• endothermic
• polythermic
• ergothermic
• exothermic

Tags

NGSS.HS-PS1-4

The minimum amount of energy needed to start a reaction is called the

• activation energy
• surface area
• concentration
• catalyst

A sample of iron receives 50.J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of .10 J/g°C, what is the mass of the iron sample?

• 25g
• 30g
• 20g
• 50g

Tags

NGSS.HS-PS3-1

As a reaction is taken place,  the student notices that the temperature has dropped. This indicates that the system has increased in energy. What type of process is this?

• Endothermic
• Exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

NGSS.HS-PS3-4