What are some examples of chemical changes?

Which of the following reactions are redox reactions? A) 4Li (s) + O2 (g) →2Li2O (s) B) Mg (s) + Fe2 + (aq) →Mg2 + (aq) + Fe (s) C) Pb (NO3) 2 (aq) + Na2SO4 (aq) →PbSO4 (s) + 2NaNO3 (aq) D) HBr (aq) + KOH (aq) →H2O (l) + KBr (aq)

a bowl of cereal is at a temperature of 62 fahrenheit then the bowl of cereal thermal energy decreases as soon as mass or not change what is the possible new temperature of the bowl of cereal 53 fahrenheit or 68 fahrenheit

Has a total of twelve $5 and $10 bills in his wallet. He has 5 times as many $10 bills as $5 dollar bills. How many of each does he have?

What is 3.00 mol sn the representative particles in a substance

What element produces yellow-orange light around 600 nm? hydrogen mercury sodium neon?

If we have 22 molecules of sodium sulfate in water, how many sodium ions will be observed in solution?

Sodiun atom, potassium atom, and cesium atoms have the same?

A molecule is what?

How many electrons in an atom could have these sets of quantum numbers n=7 l=3 ml=-1?

The reaction A+B-> C+D rate=k[A][B]^2 has an initial rate of 0.0810 M/s. What will the initial rate be if [A] is halved and [B] is tripled? What will the initial rate be if [A] is tripled and [B] is halved?