Definition of chemistry

In one or two sentences explain why fossil fuel combustion is a one-way path while the combustion of modern plant materials is a cycle.

How many moles of MgCL2 are there in 311 g of the compound

Fatty acids are carboxylic acids with a long, unbranched hydrocarbon chain. There are three main classes of fatty acids. Classify the fatty acids as saturated, monounsaturated, or polyunsaturated.

A student performs an experiment to determine the volume of hydrogen gas produced when a given mass of magnesium reacts with excess HCl (aq), as represented by the net ionic equation above. The student begins with a 0.

Hemoglobin is a substance which allows the red blood cells to carry. oxygen, carbonmonoxide, nitrogen, water

Which of the following statements describes how the periodic table is organized? 1. The elements are organized alphabetically. 2. The elements are organized by their size. 3. The elements are organized by the date they were discovered. 4.

Which of the following is a mixture A aluminum B BaSO3 C Milk D table salt

Which of the following quantum number combinations is not allowed in an atom? A. n = 2, l = 1, mr = - 1 B. n = 1, l = 1, m = 0 C. n = 8, l = 5, m = - 4 D. n = 6, l = 3, m = 2

13. Adding thermal energy to a gas at constant pressure will cause

A 3 ml volume of a solution containing an unknown concentration of hcl is added to 7 ml of water. it is then determined that the concentration of the hcl in the diluted solution is 630 mm. what was the concentration of hcl in the original solution?