Introduction to Thermochemistry

When a chemical reaction happens and it feels cold, it is an

• Endothermic rxn

• Exothermic rxn

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NGSS.HS-PS1-4

NGSS.HS-PS3-4

Heat flows from _______ to ______ objects

• cooler to warmer

• warmer to warmer

• warmer to cooler

• cooler to cooler

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NGSS.HS-PS3-4

Temperature is a measure of the...

• total energy in a substance

• heat in a substance

• average potential energy in a substance

• average kinetic energy of molecules in a substance

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NGSS.HS-PS3-4

NGSS.HS-PS3-2

The first law of thermodynamics states that energy is

• created

• destroyed

• conserved

• created and destroyed

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NGSS.HS-PS3-1

NGSS.HS-PS3-2

Twenty tortilla chips are combusted in a bomb calorimeter surrounded by 5 liters of water. The temperature of the water increases from 30℃ to 35℃. Assuming the heat capacity of the water is about 4 J/g∙ ℃ and the heat capacity of the calorimeter 2000 J/℃, what is the energy content of a single tortilla chip?

• 100 kJ

• 110 kJ

• 5.5 kJ

• 5 kJ

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NGSS.HS-PS3-4

NGSS.HS-PS3-1

H₂ + ½ O₂ --> H₂O + 285kJ is an example of a(n)

• Electrical equation

• Heat equation

• Thermochemical equation

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NGSS.HS-PS1-4

What type of reaction is this?

• Exothermic

• Endothermic

• Kinetic

• Potential

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NGSS.HS-PS1-4

the study of energy changes that occur during chemical reactions and changes in state

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NGSS.HS-PS1-4

NGSS.HS-PS3-4

NGSS.HS-PS3-1

ΔH is the same thing as:

• temperature

• q

• m

• C

If the enthalpy ter (ΔH) is negative the reaction is ____.

• Endothermic

• Exothermic

• Neutral

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NGSS.HS-PS1-4