A new and effective antibiotic becomes widely used for a particular species of bacteria. After some time, an antibiotic-resistant strain of the bacteria becomes prevalent. Which mechanism explains this phenomenon?

Why don't these gases tend to form chemical bonds? A. They have 8 electrons in their outer shell and don't need more to be stable. B. They don't have any electrons Need an answer. No Guessing.

An example of a radioactive isotope is waht

Which metalloid is in the fourth period and the same group as carbon?

The equation hcl (aq) + h2o (l) ↔ h3o + (aq) + cl - (aq) properly depicts the behavior of hydrochloric acid in water. the equation hcl (aq) + h2o (l) ↔ h3o + (aq) + cl - (aq) properly depicts the behavior of hydrochloric acid in water. a. True b.

If an atom has an atomic number of 6 and and an atomic mass of 12 how many electrons does it have

which one of these reactions is energy released? A all reactions B no reactions C endothermic reactions D exothermic reactions

Why do ionic compounds conduct electricity when dissolved in water but most covalent compounds do not?

Which of the following is an example of a molecule? F C Al O2

Organize the items listed into the proper sequence of events for gas exchange. a: O2 is transported to cells by circulatory system. b: O2 is drawn into the lungs during inhalation. c: Cells use O2 and generate CO2. d: CO2 is exhaled.

Research about the reaction of baking soda and vinegar