Rain puddle drying up, chemical or physical change

The elements in alkali metal and halogen groups of the periodic table are the most reactive since they only need to gain or lose one electron to become stable by filling their valence orbital.

The pressure inside a tire is measured as 28.0. What is its pressure in? 1 pound = 4.45 newtons 1 inch2 = 6.45 centimeters2 Express the answer to the correct number of significant figures. The pressure is.

What is the energy needed for a substance to change from a liquid state to a gaseous state?

What kind of chemical bond is formed between nonmetals? Explain your answer

Which best represents the law of conservation of mass? mass of reactants > mass of products mass of reactants < mass of products mass of reactants = mass of products mass of reactants → mass of products

A reaction is zero order in a reactant. Which best describes what happens to the rate if the concentration of that reactant is cut in half? a: The rate changes to twice the original rate. b: The rate changes to one-half the original rate.

How many moles of hydrogen atoms are there in 1 mole of C6H12O6 molecules?

Which condition will release more energy when an electron changes levels? From n = 4 to n = 3 from n = 3 to n = 2 from n = 2 to n = 1

What happens when an electron moves from a higher energy level to a lower one

A solution of a compound with a known extinction coefficient of 23,100 M-1cm-1 has an absorbance of 0.735 in a 1.30cm path length, what is the concentration of the solution