What is the heaviest naturally occurring element on earth

In an energy diagram, the reactants are at a higher potential energy compared to the products. Which of the following best describes this reaction? A) It is endothermic and will have a positive enthalpy.

How do valence electrons determine chemical properties?

A friend is trying to describe a material to you. which of the following is not a description of a physical property of the substance? a. it is red in color. b. it is magnetic. c. when combined with water, it fizzes. d. it melts at 240°c.

What volume (in liters) does 2.895 moles of oxygen occupy at stp?

A certain amount of gas is trapped in a nonrigid container at atmospheric pressure. If the container is cooled and the gas in the container remains at atmospheric pressure, what will happen? O A. The number of moles of gas will decrease. OB.

A precipitate of zinc hydroxide can be formed using the reaction below. ZnCl2 (aq) + 2 KOH (aq) → Zn (OH) 2 (s) + 2 KCl (aq) If excess KOH is used, the zinc hydroxide will form zincate ions and dissolve in the solution according to the chemical

Which of the following is the correct (unbalanced) equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide? A. P (s) + O2 (g) - -> P2O5 (s) B. P2O5 (s) - -> P2 (s) + O2 (g) C.

Nonrenewable resources are natural resources that are limited in supply and cannot be replaced as quickly as they are used up. True or false

Which method for treating arthritis is an example of pseudoscience? diet drugs exercise magnets

Only a small portion of the organisms that lived in the geologic past have been preserved as fossils. Which condition best increases the chance that an organism will become fossilized?