Chemistry Unit 1

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Last updated 7:44 PM on 8/29/26
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12 Terms

1
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Standard state

As NATURE gave it to us!

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I2 (s) and Br2 (l)

exceptions to diatomic elements naturally being gases

3
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endothermic

A process that absorbs heat from its surroundings, resulting in a temperature decrease in the environment.

4
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exothermic

a process that releases heat energy, resulting in an increase in the temperature of the surroundings.

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Heat of formation

ONE MOL of product from ELEMENTS in their NATURAL STATE

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final heat of formation - initial heat of formation

how to calculate delta H

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KJ/mol

units of delta H of formation

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KJ

units of delta H

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-615 KJ

Practice: calculate change in enthalpy using quick method for

P4010 + 6PCl5 goes to 10POCL3

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-610 KJ

Practice: calculate change in enthalpy using Hess’ Law method for

P4010 + 6PCl5 goes to 10POCL3

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bond energies

reactants: positive

Products: negative

  • add them together

  • for each, do mol(pt)(energy)


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318 KJ

Practice: find enthalpy change for 20g of H20 if


2H20 + 572 KJ goes to 2H2 + O2