Theories should inspire questions. Discuss a scientific theory you know and the questions it brings up.

Explain why molecular techniques were needed as a way to provide evidence for the neutral theory of evolution.

Describe the bonding in $\mathrm{O}_3$, using molecular orbital theory. Compare this with the resonance description.

$$\textbf {\color{#19804f}{Define }}\text{the word theory in a scientific sense and then in a more general sense.}$$

Use VSEPR theory to predict the geometric shapes of he following molecules and ions:

$\mathrm{NSF}$.

The principal stresses acting at a point on a thin-walled cylindrical pressure vessel are σ₁ = pr/t, σ₂ = pr/2t, and σ₃ = 0. If the yield stress is

$$σ_γ,$$

determine the maximum value of p based on (a) the maximum shear stress theory and (b) the maximum distortion energy theory.

a. What is a scientific theory? A scientific law? b. How do scientific theories differ from scientific laws? c. The students who conducted the shadow length experiment concluded that their results supported their hypothesis. Can their supported hypothesis be called a scientific theory? Why or why not?

Briefly describe the four major features of our solar system that a formation theory must explain.

Using the VSEPR theory, predict the molecular structure of each of the following molecules.
b. $\mathrm{AsH}_3$

How did the work of Lyell and Malthus influence Darwin as he developed his theory of evolution?

Use VSEPR theory to predict the geometric shapes of the following molecules and ions:

$\mathrm{SO}_3$;

Give the definition of the opponent-process theory of emotion. Enumerate and discuss the four characteristics of opponent processes.

Apply collision theory to explain why increasing the concentration of a reactant usually increases the reaction rate.

Respond: How d id you feel about Mr. Gradgrind' s theory of education ?