These events are actually sorted right, according to the time they occurred.
1. Democritus proposes the existence of atoms - this happened in the 5th century BC
2. Dalton's atomic theory - it was first presented in 1803
3. J.J. Thomson discovers the electron - happened in 1897
4. Rutherford's gold foil experiment - somewhere between 1908 and 1913
5. Bohr model - it was introduced in 1913
6. Schrodinger's wave - the equation was published in 1925
Answer:
C5H7N
C10H14N2
Explanation:
ok so lets lay out this nicely
elements C H N
percentage 74 8.7 17.3
mass number 12 1 14
divided percentage by mass 6.167 8.7 1.2357
now divide the smallest number with the 4.99 7.04 1
rest for instance 1,237 is the smallest.
so 6.167÷1,237
and 8.7 ÷1.237
and 1,237 divide 1.237
now the ratio is C5H7N
now for molecular formula find Mr of C5H7N which is (12×5)+7+14=81
next divide 162.1÷81=2
so now for molecular formula just multipily everythng by 2
C10H14N2
Answer:
A. 0.15 M NaOH, and
E. 0.15 M HNO3
Explanation:
A buffer solution contains a conjugate acid-base pair with both the acid and the base in reasonable concentrations.
NaOH and HNO3 is an acid base pair with relatively equal concentrations. So, they would most likely make a buffer solution.
Hypothesis
Therefore the last step in the scientific method is proposing a hypothesis or obtaining a conclusion
12. V.
13. W.
14. A.
15. R.
16. N.
17. X/Y
18.X/Y
19. M.
20. O.
21. W.
22. I.
23. U.
24. T.
25. P.
————
I believe that is all right
Sorry if not, Gl!
By the way, the ones that are “X/Y”
are the same answer so just put either X or Y.
