Which of these reactions are redox reactions? Check all that apply.

Cd + HCl → CdCl2 + H2

CuCl2 + Na2S → 2NaCl + CuS

CaCO3 → CaO + CO2

2ZnS + 3O2 → 2ZnO + 2SO2

CH4 + 2O2 → CO2 + 2H2O

Which substance represents a compound? 1. CS2 (s) 2. Cs (s) 3. C (s) 4. O2 (9)

All matter on earth contains energy

The equilibrium 2NO (g) + Cl2 (g) ⇌2NOCl (g) is established at 500 K. An equilibrium mixture of the three gases has partial pressures of 9.30*10-2 atm, 0.174 atm, and 0.25 atm for NO, Cl2, and NOCl, respectively.

Explain what domain would best be represented by the "?" in the diagram. A) Eukarya because the organisms are all eukaryotic. B) Eukarya because the organisms are all prokaryotic. C) Bacteria because some of the organisms are autotrophs.

How many seconds are in 1 minute

The standard enthapy of combustion of solid urea co (nh2) 2 is - 632kjmol-1 at 298k

What happens to an isotopes during radioactive

Why does the effective nuclear charge increase across a row of the periodic table?

Iodine-131 decays to form xenon-131. the half-life of this reaction is 8.07 days. from a 200-g sample of iodine-131, how much of the sample is xenon-131 after 16.14 days?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.