Who used experiments and scientific tools to study matter?

The rare earth elements include A. the actinide series and the alkaline earth metals. B. the alkali metals and the transition metals. C. the lanthanide series and the actinide series. D. the lanthanide series and the alkali metals.

A compound consists of 4.50 g of nitrogen for every 7.71 g of oxygen and has the same empirical and molecular formula identify the compound

Which of these is an example of a physical change? a banana ripening in the air hydrogen burning in the air zinc reacting with an acid liquid water turning into vapor

Whats 2 + 2? correct answers only

How many electrons are in an atom of chlorine with a - 1 charge? 17 16 18 8

A cylinder contains oxygen at a pressure of 10.0 atm and a temperature of 300.0 K. The volume of the cylinder is 10,000 mL. What is the mass of oxygen gas?

4 - explicar as mudanças de estados fisicos da materia 6 - definir e exemplificar: -Ligações iônicas ou eletrovalente -Ligações covalentes ou molecular 7-definir substancias puras e suas clasificações 8-definir e exemplificar misturas homogeneas e

What ion forms when an acid is dissolved in a solution?

Suppose you found a material in which 12.5% of the original radioactive atoms were present. if the half-life is 47 years, how old is the material?

How many neutrons does xenon have?