In the reaction C7H16 + __O2 → 8H2O + 7CO2, what coefficient should be placed in front of O2 to balance the reaction?

7

8

11

no coefficient is needed

During which changes of state do atoms that cannot move past one another become free to move? vaporization and sublimation boiling and deposition sublimation and melting condensation and melting

Which of the following is one way to prevent the corrosion of iron

As a gas changes to a solid, energy A. is not used. B. is released. C. is absorbed.

What would be the mass of 1.98*10^28 molecules of H2O

Ground water is: O stored in porous soil and rock o part of the nitrogen cycle O reduced by respiration O unavailable to plants

During an endothermic phase change, what happens to the potential energy and the kinetic energy? Potential energy stays the same, and kinetic energy increases. Potential energy increases, and kinetic energy increases.

In the following atomic model, where does the strong nuclear force happen? А B с -0 outside A between A and B between B and C O inside C

Which groups of elements on the periodic table form metal ions that do not require roman numerals in their names?

Write the Chemical formula for the conjugate base of the following Bronsted-Lowry acids. A) H2SO4 B) HPO4^2-

The heat from the bonfire is transferred to the student's hands through the process of