Conduction of an electric current is a general property associated with metals. How does the theory for metallic bonding explain conductivity?

How many tin atoms are contained in the tetragonal crystal lattice unit cell of $\beta$-tin? How many tin atoms are contained in the cubic crystal lattice unit cell of $\alpha$-tin?

Outline a two-dimensional unit cell for the pattern shown here. If the black squares are labeled A and the white squares are B, what is the simplest formula for a "compound" based on this pattern?

What does the dividend-capture theory imply about the volume of trade in a stock around the ex-dividend day?

Which of these species has a longer bond, $\mathrm{B}_2$ or $\mathrm{B}_2^{+}$? Explain in terms of molecular orbital theory.

Based on drive reduction theory, a s______________ reinforcer is one that has been related, directly or indirectly, with a p_____________ reinforcer.

Use VSEPR theory to predict the probable geometric structures of the molecules
(b) $\mathrm{O}_3 \mathrm{XeF}_2$;

How do experiences alter our schemas? Describe two processes of change of schemas in Piaget's theory.

Use the theory of congruences to verify that $89 | 2^{44}-1 \quad$ and $\quad 97 | 2^{48}-1$

What is the difference between a hypothesis, a law, and a theory? $1.206 \times 10^{-23}$ expressed to the power of $10^{-25}$?

Which of the postulates of Dalton's atomic theory explains why we can calculate a theoretical yield for a chemical reaction?

The gas tank has an inner diameter of $1.50 \mathrm{~m}$ and a wall thickness of $25 \mathrm{~mm}$. If it is made from A-36 steel and the tank is pressured to $5 \mathrm{MPa}$, determine the factor of safety against yielding using (a) the maximum-shear-stress theory, and (b) the maximum-distortion-energy theory.

Does VB theory indicate that the diatomic molecule $\mathrm{He}_2$ is a viable species? Rationalize your answer.

Correct each of the following misstatements from Dalton’s atomic theory.

a. Elements are made of tiny particles called molecules.