How many kinds of atoms are in a pure substance?

Why does every chemical reaction require a certain amount of activation energy? OA. Energy is released when the reactants begin to react. OB. Energy lost to the environment during the reaction must be replaced. O C.

A) Calculate the pH of a 1.8 * 10 - 4 M HCl solution b) Calculate the [H + ] and pOH of a 0.05 M KOH solution

Why are cnidocytes important to a sea jelly

How many o atoms are in Zn (ClO3) 2?

Mole concept One can of Welch's grape soda contains 0.283 moles of fructose (C6H1206). How many grams of fructose are in one can of this soda?

Chen is testing the friction of three surfaces. He pushes the same ball across three different surfaces with the same force and measures the distance of each ball.

Name the folowing ionic compound MgCl2

How can substitution mutation affect a person's traits?

Which two compounds are electrolytes A) KOH and CH3COOH B) KOH and C5H12 C) CH3OH and CH3COOH D) CH3OH and C5H12

Explain why it is harder to remove an inner shell electron than a valence electron from an atom?