Which group of elements has a stable number of electrons in their outer energy level?

a. noble gases

c. halogens

b. alkali metals

d. alkaline earth metals?

State three reasons why do you think air is a mixture and water a compount?

Water is called the "universal solvent." Which statement best explains this description with respect to ionic compounds?

What causes the colors observed during a flame test

What does the article say about how ocean acidification may affect plant and/or animal species of our planet?

What are the two main systems we use for describing acids and bases?

What water activities might be easier to do in Lake Assal's salty water? What activities could be more difficult?

The suffix "-megaly in the term gastromegaly means:

The harder you strike a drum, the greater the sound's A) medium B) volume C) frequency D) pitch

The equation X + Y 2Z has the rate law equation shown below. Which of the following statements best describes the relationship of X on the rate of the reaction? rate = k[X]2[Y] Changing X has no effect on the reaction rate.

What moves in or out of a substance during a change of state?