What term describes elements that contain the same number of valence electrons?

Does water behave as an acid or a base when it reacts with deprotonated methylamine?

Which of the following changes will decrease the rate of collisions between gaseous molecules oftype A and B in a closed container? A. decrease the volume of the container B. increase the temperature of the system C. add A molecules D.

A gas occupies 50.0 ml at standard temperature and pressure. if the volume of gas increases to 120ml, what is the new pressure

In which ways do humans affect the environments of animals?

Which energy changes are associated with a liquid boiling? Energy is released, and potential energy decreases. Energy is absorbed, and potential energy increases. Energy is released, and kinetic energy decreases.

The solubility of carbon dioxide gas in water can be increased by

How many sodium ions are there in 85 g of sodium oxide?

When sodium metal is added to water, the following reaction occurs: 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g) What is the theoretical number of moles of hydrogen gas should be produced when 0.068 mol of sodium metal reacts? a. 1.0 mol H2 b. 0.

Periodicity is best defined as: the fact that elements increase in atomic mass in a regular way. the repeating nature of physical and chemical properties with increasing atomic number. the regular growth of atomic size with atomic mass.

A mixture consists of sand, salt, and iron filings. Which of the following instruments or materials would NOT be useful in separating this mixture? a. magnet b. filter paper c. screen d. water