Why do scientists create models to describe atoms

DNA is not always available in a hair sample. A True B. False

What maintains the secondary structure of a protein? peptide bonds hydrogen bonds?

What is the ph of a solution containing 0.12mol/l of nh4cl and 0.03 mol/l of naoh (pka is 9.25) ?

Was is an intial observation

Gasoline is used to power most of the cars in the United States and worldwide. The average fuel economy for a gasoline powered car is about 32 miles per gallon. The average car in the U. S. Is driven about 15 000 miles (24 000 kilometers) per year.

An experiment with high validity is

What is the smallest part of a tree that can do all the things needed for life?

As the PH scale decreases or increases, how does this affect the acidity?

During an endothermic phase change, what happens to the potential energy and the kinetic energy? Potential energy stays the same, and kinetic energy increases. Potential energy increases, and kinetic energy increases.

In the following atomic model, where does the strong nuclear force happen? А B с -0 outside A between A and B between B and C O inside C