Identify the following processes as endothermic or exothermic.

Potassium is a very reactive metal, but in compounds it is present as the potassium ion and is not very reactive. For example, dry potassium bicarbonate powder can be used to extinguish burning liquids. Why is there such a difference in the reactivity of potassium metal and the potassium ion? A. The potassium in the bicarbonate salt is a base, but the potassium metal is an acid. B. The potassium in the bicarbonate salt is an acid, but the potassium metal is a base. C. The combustion of the liquids suppresses the potassium's ability to react. D. The potassium metal can readily ionize by losing its one valence electron; the potassium in the bicarbonate salt is already ionized. E. The potassium atom is bonded to an oxygen atom in the bicarbonate salt, but in the metal it is unbound and free to react.

Compare the following compounds based on the property given.

Your roommate, a history student, has stumbled across nitrogen trifluoride in their history textbook because it was used in the 1960s and 1970s as rocket fuel oxidizer. They remember learning about chemical reactions in Grade 11 and want to make nitrogen trifluoride using nitrogen gas and fluorine gas. Since you are a chemistry student, you have decided to help them remember how to construct the formula. Your other roommate, who is a mathematics student, wants to create a hypothetical situation so that the history student can better understand the concept. She writes down a mass for fluorine gas and nitrogen gas.  1. If she wrote that the mass of nitrogen gas as 114.6 g and the mass of fluorine gas as 354.8 g which is the limiting reagent in this case? 2. The mass of nitrogen trifluoride produced that she wrote is 469.4 g. What is the theoretical mass of nitrogen trifluoride produced calculated using the given masses? Is this higher or lower than the mass that she wrote?  3. If it is…

To prepare 0.20 M NaOH (40.0 g/mol) you will need to dilute 34 g of NaOH to ____ mL. a.2.6 mL b.4.2 mL c.4200 mL d.170 mL e.590 mL

A 1:20 dilution is done with a 0.2500 M Na,SO, solution. What is the concentration of the diluted solution ? A. 0.5000 M B. 0.0500 M C. 0.1250 M D. 0.01250 M