A Question 2 (1 point) Retake question A student is trying to run an experiment that uses magnesium oxide, but he does have any magnesium oxide available. What he DOES have is magnesium and oxygen, so he can synthesize the magnesium oxide he needs according to the equation below. How many grams of magnesium will the student need to use if experiment requires 1.86 moles of magnesium oxide? Remember to round your answer to the nearest 0.01 and include units. 2Mg + O2 --> 2Mgo Your Answer units Previous Page Next Page Page 2 o​

Lab reagent, hypothesis test. a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl. these six measurements are assumed to be an srs of all possible measurements from solution. they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution. carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.

Element j is 1s 2s 2p 3s . (i) how many unpaired electrons does j have? (ii) is j a good oxidizing agent or a reducing agent? (iii) state reason for the answer.

In which of the following phases of matter do molecules have the highest amount of energy? a. liquid b. gel c. solid d. gas