Bài 1: Đốt cháy 28 lít khí mêtan CH4 trong không khí sinh ra khí cacbon đioxit và hơi nước. a. Tính khối lượng nước tạo thành.
b. Tính thể tích không khí cần dùng, biết oxigen chiếm 1/5 thể tích không khí. Các thể tích được đo ở đktc.

Which metal exist in liquid state and can be cut with knife ?

Imagine that twenty i.u.’s of enzyme z were catalyzing the above reaction for one minute, under vmaxconditions, in a 3.00 ml assay volume. the assay is buffered with 20 mm phosphate buffer, ph 7.60. what will the ph be at the end of that one minute?

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.