Given the reaction that occurs in an electrochemical cell:

Zn (s) + CuSO4 (aq) ZnSO4 (aq) + Cu (s)

During this reaction, the oxidation number of Cu changes from

A) 0 to + 2

B) 0 to - 2

C) + 2 to 0

D) - 2 to 0

What are the applications of chromatography

When 25.0 grams of solid potassium hydroxide (KOH, molar mass = 56.1 g/mol) is dissolved in 100.0 grams of water, the solution increases in temperature by 61.5ºC.

What is benzoxazole?

What is the pH difference of two samples if the concentration of [H+] ions is 1000-fold less in the second sample? a. The pH of the first sample would be 3 pH units lower than the second sample. b.

Which of the following is the first step in balancing a chemical equation?

Which of the following is an example of a molecule? F C Al O2

Organize the items listed into the proper sequence of events for gas exchange. a: O2 is transported to cells by circulatory system. b: O2 is drawn into the lungs during inhalation. c: Cells use O2 and generate CO2. d: CO2 is exhaled.

Research about the reaction of baking soda and vinegar

What mass (in mg) does 2.63 moles of nickel have? 3.56 * 105 mg 1.54 * 105 mg 2.23 * 104 mg 129 mg?

Given the propane molecule C3H8 (g) ! a) What is the balanced equation for the combustion of propane in O2? (20 pts.) b) What is the standard enthalpy change ΔH0 for the reaction at 25°C? (20 pts.