Which of these elements has two valence electrons? hydrogen (H) barium (Ba) nitrogen (N) krypton (Kr) bromine (Br)

What is chemergy chemestry?

Without a catalyst, a reaction may require very high temperatures in order to occur. How does a catalyst speed a reaction at low temperatures? It raises the amount of energy required to break chemical bonds.

Find pH for lemon juice pH = - log[0.00500]

Why do some substances react with each other while others do not

1. Water is easily contaminated by both biological and chemical contaminants. Define and give 3 examples of each 2. What happens when you mix an acid and a base 3. How does ppm compare to ppb 4.

Which of the following is an extensive physical property of matter? volume viscosity odor density

When is Ksp determined for a system?

What is the average surface temperature of Uranus

Consider the following statements. A. Molecules of hot water have less kinetic energy than those of cold water. B. For most solids, solubility increases when temperature increases. C.

Which describes the fourth state of matter known as plasma? A It is a liquid containing nuclei and electrons. B It is a gas containing nuclei and electrons. C It is a liquid containing electrons created by fusion.