04.04.24 - Entropy

Presentation

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Science

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12th Grade

•

Practice Problem

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Easy

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NGSS

HS-PS1-4, HS-ESS1-5, K-ESS3-1

Standards-aligned

Krista Carcaterra

Used 4+ times

FREE Resource

5 Slides • 9 Questions

✍️Aim: Why do some reactions occur spontaneously?

Poll

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Do Now: 4 Questions

Multiple Choice

1. What is the value PE of the reactants?

240 kJ

160 kJ

80 kJ

120 kJ

Multiple Choice

2. What is the value PE of the products?

240 kJ

160 kJ

80 kJ

120 kJ

Multiple Choice

3. What is the value Activation Energy of the reaction?

240 kJ

160 kJ

80 kJ

120 kJ

Multiple Choice

4. Based on the information in the diagram and your prior answers to questions 1 and 2, what is the enthalpy ∆ H of the forward reaction? Calculate it.

240 kJ

160 kJ

80 kJ

120 kJ

✍️Why do reactions happen spontaneously?

Heat = H
- change in heat =ΔH
- ΔH = Enthalpy
Entropy (S): the change in disorder/randomness of particles
- change in entropy = ΔS
Spontaneous Reactions: any reaction that will occur naturally by itself.
When do reactions happen spontaneously?
- heat (ΔH) decreases (-)
- entropy (ΔS) increases (+)

Let's Practice!

Multiple Choice

5. What is the definition of enthalpy?

measure of disorder

change in heat and energy

change in moles

measure of volume

Multiple Choice

6. Look at Table I. Are most reactions endothermic or exothermic?

Exothermic

Endothermic

Neither

Multiple Choice

7. What is the definition of entropy?

measure of disorder

change in heat and energy

change in moles

measure of volume

Multiple Choice

8. Which physical phase has the highest entropy?

Solid

Liquid

Gas

Aqueous

✍️Aim: Why do some reactions occur spontaneously?

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