True or False: It is OK to heat a sealed vessel. (In other words do you need to fit a release valve on your glassware in case pressures builds up)

The halogen family elements possess six electrons in the valence energy level. True False

What 3 colors are used to create the color white on a TV or computer screen?

Explain the periodic trends of atomic radii, electronegativity, and ionization energy.

Which one of the following types of rock would weather the fastest A. Small piece of granite B. large blocks of clay C. small pieces of clay D. Large blocks of granite

What are the 5 levels of multicellular organization

Periodic table, chemistry questions who discovered lanthanides. how did they discover it, when did they discover it.

A flask containing 155cm^3 of hydrogen was collected under a pressure of 22.5kPa. What pressure would have been required in order for the volume of the gas to have been 90.0 cm^3 at constant temperature?

Which change is most likely to occur when a molecule of H2 and a molecule of I2 collide with proper orientation and sufficient energy? 1. a chemical change, because a compound is formed 2. a chemical change, because an element is formed 3.

Which substance is a diatomic molecule? a. he b. o2 c. co2 d. h2o?

What is the difference between the electronegativity values of sodium and bromine?