In the reaction:

NH3 + H2O ↔ NH4 + OH-

The two Brönsted acids are

A) NH3 and H2O

B) NH3 and OH-

C) NH4 + and H2O

D) NH4 + and OH-

A blank is a possible explanation for a set of observations or answer to a scientific question

Consider the following generic chemical equation: 2W + 3X → 3Y + Z When 5 units of W and 6 units of X are allowed to react, the limiting reactant would be:a) W. b) X. c) Y. d) Z.

What do element; atoms; molecule; chemical bond; compound; mixture; and substance have in common

Describe gas production

Which statement is true about this reaction? It is a practical source of energy on Earth. It occurs only outside the solar system. Its product is heavier than each of its reactants. It shows the critical mass of an element.

Which of the following processes includes all of the others? Group of answer choices transport of an ion down its electrochemical gradient osmosis passive transport facilitated diffusion

How is the Bohr atomic model different from the plum-pudding model? A. In Bohr's model, the atom's mass is found at its center instead of distributed throughout. B. In Bohr's model, the atom's mass is mostly made up of electrons instead of protons.

What does the cell theory state? A. that cells come from other cells B. that cells come only from animals C. that cells cannot be created or destroyed

For which one of the following molecules is the indicated type of hybridization not appropriate for M the central atom? a. BeCl2 sp2 b. SiH4 sp3 c. BF3 sp2 d. C2H2 sp e. H2O sp3

P4O10 (s) = - 3110 kJ/mol H2O (l) = - 286 kJ/mol H3PO4 (s) = - 1279 kJ/mol Calculate the change in enthalpy for the following process: P4O10 (s) + 6H2O (l) → 4H3PO4 (s)