A persn uses 750 kcal on a long hike. Calculate the energy used in both units:

a. joules

b. kilojoules

Why does the mood have phases

What is the molality of an aqueous solution containing FeCl3 (MM = 162.2 g/mol) with a mole fraction of FeCl3 of 0.15?

Javier forgot to polish the magnesium metal. Will the reported mole ratio of magnesium to oxygen be too high or too low as a result of his mistake? Explain.

Nitrogen dioxide is one of the many oxides of nitrogen (often form another form of NOx, dinitrogen tetroxide A chemical engineer studying this reaction fils a 500. mL flask at 7.9 °C with 4.9 atm of nitrogen dioxide gas.

Zn is placed in a solution of Cu (No3) 2 and Cu is placed in a Zn (NO3) 2 solution. In which of these will a reaction occur?

Which impurity can bioaccumulate in aquatic systems? A. Mercury B. Sulfur C. Carbon Dioxide D. Methane

What is the element K2SO4 and is it ionic, covalent or polyatomic

The elements in a star can be determined by analyzing the star's spectrum. Which statement explains why no two elements have the same spectrum? A. Each element has a unique arrangement of electrons. B.

What's the difference between cation and an anion

Where does the largest percent of water exist on Earth?