3. Which element is most important for growing crops?

a. carbon dioxide

BA

b. hydrogen

C. calcium

d. nitrogen

4. Who discovered how to manipulate equilibrium systems?

Noble gases are especially stable because A) They have equal numbers of protons and electrons B) They have more neutrons than protons C) The outer energy level (valenc electrons) is full with 8 electrons D) They have even numbers of protons Bonding

Write the Henderson-Hasselbalch equation for a solution of formic acid.

A roller coaster reaches its maximum kinetic energy when it?

Which atom or ion is the largest? A. K B. K + C. Ca D. Ca2 + E. Li

A) What are the postulates of Bohr's model of an atom? (b) Show diagrammatically the electron distributions in Sodium, Lithium and Aluminium atoms

Trisha and her lab partner were conducting a variety of experiments to produce gases: hydrogen, oxygen, and carbon dioxide. In one experiment, they added a piece of magnesium ribbon to 10 milliliters of hydrochloric acid.

what mass of magnesium is required to react with excess nitrogen to produce 0.500 mol magnesium nitrade

Silver chromate is sparingly soluble in aqueous solutions. the ksp of ag2cro4 is 1.12 * 10-12 m3. what is the solubility (in mol/l) of silver chromate

What do you think 1,5-pentanedithiol C5H12S would smell like

If an atom has sp hybridization in a molecule: the maximum number of σ bonds that the atom can form is