What type of reaction is the following: 2H2+O2=>2H2O

How many grams of CO2 are in 2.1 mol of the compound? a. 21.0 g b. 44.0 g c. 66.0 g d. 92.4 g

List 4 clues that a chemical reaction is occurring

5. What is the density of an 84.7 g sample of an unknown substance if the sample occupies 49.6 cm3?

Air contains mostly nitrogen (78%) and oxygen (21%). It also contains other gases, including carbon dioxide and helium, and various pollutants (both gases and solids).

When a person pushes off a wall with 15N of force, how much force does the wall push back

The mass flow rate of gasoline leaving a refinery is 1610 kg/min. The specific gravity of a gasoline is 0.700. A retail gasoline pump is able to fill a 20.0 gallon automobile tank in 1.80 minutes.

Calculate the solubility of cux (ksp=[cu2+][x2-]=1.27*10-36) in a solution that is 0.190 m in nacn.

An atom has seven valance electrons which element could have this type of atom

How is the ocean important to human survival? restate the question

A sample of pure lithium contains 7.99% lithium by mass. What is the % lithium by mass in a sample of pure lithium nitrate that has twice the mass of the first sample?