Which of the following describes an exothermic reaction?

O

A. AHI, reactants = 0

O

B. AHf, reactants = AHf, products

O

C. A He, reactants > AHf, products

O

D. A He, reactants < AH, products

A shoe store sells a foot cream that claims to relieve foot pain. Which is the best source to use when evaluating this claims? A. Someone who works at the store B. The website of the company that makes the foot cream C.

A rubber ball falling vertically bounces off a concrete floor. Just as that ball begins to bounce up, all of its energy is kinetic.

To what volume should 25mL of 15M nitric acid be diluted to prepare a 3.0M solution?

White-tailed deer eat green plants, acorns, fruits, nuts, and twigs. Which describes the role of a white-tailed deer? Aautotrophic omnivore Bheterotrophic omnivore Cautotrophic herbivore Dheterotrophic herbivore

When the number of protons and electrons are the same the atom is A.) neutral. B.) charge. C.) balanced. D.) unbalanced.

What is a neutral atoms oxidation number

Suppose 30 grams of NaCl are placed in 900 mL of water. What is the molarity of this solution?

After a particularly cold day outside you go home to make some tea. you heat the water in the mug so that botch are about 75 degrees celcious. the tea bag is only 30 degrees celcious and the room is around 26 degrees celcious.

For main-group elements using the older numbering system the group number on the periodic table corresponds to which characteristic of the elements of that group

In the vertical columns of the periodic table, as the atomic numbers increase: a. the number of electron shells increases. b. the ionization energies increase. c. the number of electrons in the valence shell increases. d.