Carbon is considered an element, while carbon dioxide is considered a compound. This is because carbon dioxide is A. a gas room teampature b. made of two diffrent elements c. useful to human beings d. given off by plants

Which of the following is not a characteristic of a hydrogen bond? 1. it is responsible for the unusual physical properties of water. 2. it is weaker than a covalent bond. 3. it is stronger than other dipole-dipole interactions. 4. it can occur when hydrogen is covalently bound to very electronegative elements liks f, cl, br and i.