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4.1: Activity: Temperature and molecular movement

Adjust a slider to see how changes in temperature affect the form that water takes.

4.2: Activity: Salt dissolving in water

Explore the process of salt dissolving in water represented by figure 4.4.

4.3: Tutorial: Acids, bases, and pH

This tutorial explores how the pH scale measures the strength of an acidic or basic solution.

4.4: Activity: Building proteins from amino acids

Explore how covalent bonds are formed through dehydration synthesis reactions.

4.6: Tutorial: Heat changes protein structure: Frying an egg

This tutorial explores how the weak hydrogen bonds that maintain the three-dimensional shape of proteins can be broken easily by chemicals or heat.

4.1: Process Animation: Formation of Covalent Bonds

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W. W. Norton & Company has been independent since its founding in 1923, when William Warder Norton and Margaret D. Norton first published lectures delivered at the People's Institute, the adult education division of New York City's Cooper Union. The Nortons soon expanded their program beyond the Institute, publishing books by celebrated academics from America and abroad. By mid-century, the two major pillars of Norton's publishing program—trade books and college texts—were firmly established. In the 1950s, the Norton family transferred control of the company to its employees, and today—with a staff of 400 and a comparable number of trade, college, and professional titles published each year—W. W. Norton & Company stands as the largest and oldest publishing house owned wholly by its employees.