How much pressure would 4.85 moles of He gas exert in a 4.50 L tank at 55° C?

Based on results of his study of atomic x-ray spectra, Moseley discovered a relationship that replaced atomic mass as the criterion for ordering the elements.

Clare is a 14-year-old female who lives with her 29-year-old mother and three younger siblings in a two-bedroom apartment in a housing project. At school, Clare has acted out in class and has twice been held back a grade-level.

What block does sodium belong to?

The chromosphere is the lowest layer of the Sun's atmosphere. True or False?

Mixtures are different from compounds because compounds have to be

Which of the following gases in Earth's atmosphere would you expect to find as molecules and which as individual atoms? a. Nitrogen b. Oxygen c. Argon

You just found a metallic object in a creek bed. From the following tests and Figure 2, determine what it is. 96.5g will balance the object. Its mass is g. The object displaces 5 mL of water. Its volume is cm 3. The density of the object is g/cm 3.

Extend your thinking: Why do you think the temperature does not change much during a phase change? If possible, discuss your answer with your classmates and teacher.

Which bond has the least degree of polarity? K-o Li-o No-o Rb - 0

What happens when a glass is filled to the brim with water and an ice cube is in the glass already what would happen to the level of water when the ice cube had melted?