This equation indicates that the reaction absorbs heat. What is this type of reaction called? H2O + heat → H2 + O2 A. an exothermic reaction B. a combustion reaction C. an endothermic reaction D. a heat-releasing reaction

In the molecule ClF5, chlorine makes five covalent bonds. Therefore, five of its seven valence electrons need to be unpaired. The orbitals with the same energy are known as degenerate orbitals.

If 24.6 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 301 Kelvin and 1.01 atmospheres? Show all of the work used to solve this problem. 2 Li (s) + 2 H2O (l) 2 LiOH (aq) + H2 (g)

Carbon is found in all living organisms. The constant flow of carbon on Earth through organisms and the air is known as the carbon cycle. absorb carbon from the atmosphere in the form of carbon dioxide. They use it for respiration and.

A mixture of lipids is applied to a silica gel column, and the column is then washed with increasingly polar solvents. Arrange the lipids in order of elution by placing the first lipid to eluted at the top.

Which of the following is true? A. The least reactive element in group 2 is the one with the largest atomic radium and the least amount of attraction between the nucleus and the valence electrons. B.

Calcium (atomic number 20) has electron configuration 1s2,2s2,2p6,3s2,3p6,4s2. The atomic number of scandium is 21. Which orbital does the 21st electron enter? a. 3d b. 4p c. 4d d. 4f

In these solutions, identify the solute and the solvent Sea water, a solution composed of a variety of salts dissolved in water. The salt is the Soda water, a solution composed of carbon dioxide gas dissolved in water.

What is an Element and how it different from a Atom?

4 HCI + O2 - > 2 H2O + 2 CH2 How many moles of H2O can be produced from 30. moles of HCI?

How many molecules of nitrogen gas are in 22.4 L? A. 6.022 * 10^22 B. 6.022 * 10^23 C. 6.022 * 10^24 D. 6.022 * 10^25