21) iodine-131 and iodine-127 are examples of __?
A nuclei
B isomers
C isotopes
D neutrons
22) the __ is where the electron is most likely to be found.
A energy level
B electron orbit
C electron coud
D orbit
23) in a lewis dot diagram, the dots represent __ in the atom.
A all the electrons
B the valence electrons
C the protons
D the neutrons
24) which groups are considered to be transition elements?
A 1 and 2
B 3 through 12
C 1,2 and 18
D 13 through 18
25) an example of a chemical formula is __.
A. Na
B. 4.5 g/mL
C. H2SO4
D. d= 13.6 g/l
2007-09-26 04:42:37 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
21) C) isotope
22) C) electron cloud
23) B) the valence electron
24) B) 3-12
25) C) H2SO4
2007-09-26 04:47:59 · answer #1 · answered by Dr Dave P 7 · 0⤊ 0⤋
1. True but your concern is valid. The (OH) ion does not indicate it is negative but assumes you know that. 2. right on! 3. False is correct. Au does not react with HCl or H2SO4 4. Industry used sulfuric acid because it is cheaper than HNO3, so false is the better answer. 5c. base since it is used to counteract HCl acid in the stomach. a., b., and d. are ok.
2016-05-19 00:38:41 · answer #2 · answered by mirta 3 · 0⤊ 0⤋
C
C
B
B
C
2007-09-26 04:54:40 · answer #3 · answered by ag_iitkgp 7 · 0⤊ 0⤋