Why does the ozone layer important to life on earth?

What mixture can be separated by using a filter? O a mixture of two immiscible liquids O a mixture of solid particles in a liquid O a mixture of two miscible liquids O a mixture of liquid particles in a gas

Who created the periodic table and in what year?

Which of the following statements is true? A. Metals lose electrons to become cations. B. Nonmetals gain electrons to become cations. C. Metals gain electrons to become cations. D. Nonmetals lose electrons to become cations.

How much heat is required to decompose 25.5 grams of NaHCO3? 2NaHCO3 (s) + 129 kJ 2Na2CO3 (s) + H2O ( g. + CO2 ( g.

Mass is 5 grams and the volume is 4.5 grams what is the density

Do all organisms perform meiosis?

which one of these reactions is energy released? A all reactions B no reactions C endothermic reactions D exothermic reactions

Why do ionic compounds conduct electricity when dissolved in water but most covalent compounds do not?

Which of the following is an example of a molecule? F C Al O2

Organize the items listed into the proper sequence of events for gas exchange. a: O2 is transported to cells by circulatory system. b: O2 is drawn into the lungs during inhalation. c: Cells use O2 and generate CO2. d: CO2 is exhaled.