Which of the following indicates that an exothermic reaction has taken place?

A. a change in color

B. release of heat and/or light energy

C. cooling of the surroundings

D. absorption of heat by the reaction ... ?

Which item is made from a basic ingredient? A) Soda B) Wine C) Leafy vegetables D) Toothpaste

You have two sealed jars of water at the same temperature. in the first jar there is a large amount of water. in the second jar there is a small amount of water.

The thermal reaction of cis - (CO) 4 (PR3) 2 + CO → Mo (CO) 5 (PR3) + PR3 occur most rapidly when R = ? a. PMe3b. PH3c. PEt3d. PPh3

Physical Meaning of pKa Which of the following aqueous solutions has the lowest pH: 0.1 M HCl; 0.1 M acetic acid (pKa = 4.86); 0.1 M formic acid (pKa = 3.75) ?

Describe at least two differences between ionic and covalent bonds.

A student states the following: "Since acetone (nail polish remover) evaporate more readily than water, one would assume that acetone has weaker intermolecular forces than water." Evaluate their claim. (2 sentences)

A catalyst can only be used once. True False

On what basis do we distinguish between substances and separate them from one another?

What is the net ionic equation for the following reaction? H2CrO4 + Ba (OH) 2

How does improving food-storage facilities make farming more sustainable? A. It decreases the amount of water needed. B. It keeps food from rotting as quickly and being wasted. C. It decreases the amount of land needed. D.