1.How do scientists test their hypothesis?
A.Designing models
B.Doing experiments
C.Drawing conclusions
D.Formulating questions
2.What do you call the law where the elements arranged to the magnitude of atomic masses show in a periodic change of properties?
A.Law of Octaves
B.Triads
C.Law of Motions
D.Periodic Law
3.Who devised the Elements where he grouped elements by eight?
A.Johnann Wolfgang Dobereiner
B.John Alexander Reina Newlands
C.Dmitri Inovich Mendeleev
D.Lothar Meyer
4.The following are safety guidelines you should follow when working inside the laboratory except?
A.Thease your classmates while doing experiment
B.Handle glass with care
C.Read the labels of the chemicals before using them
D.Report immediately to the teacher
5.He is a scientist that had independently reached a similar conclusion,published after the appearance of Mendeleev's Paper.
A.Johnann Wolfgang Dobereiner
B.John Alexander Reina Newlands
C.Dmitri Inovich Mendeleev
D.Lothar Meyer​