A gem has a mass of 4.50 g. When the gem is placed is placed in a graduated cylinder containing 2.00 mL of water, the water level rises to 3.45 mL

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.

32p and 31p are two isotopes of phosphorus. compare the number if subatomic particles that are present in the atoms of these isotopes.

Hydrogen has three isotopes 1h, 2h, and 3h. what is the difference between these three isotopes?