NAME__________________________________
12/4 rev ws for exam #1
1] What are the six most abundant elements in the human body?
Calcium, nitrogen, carbon, hydrogen, oxygen, phosphorus [CaNCHOP]
2] What are the four most abundant elements in the earth’s crust?
Iron, aluminum, silicon, oxygen [FeAlSiO]
3] What does the Law of Conservation of Matter say?matter is not created or destroyed in
a chemical change
4] Who discovered the Law of Conservation of Matter? Lavoissier
5] In 1804, who determined that the Laws of Definite and Multiple Proportion and Law
of Conservation of Matter told us that matter is atomic? Dalton
6] Who discovered the electron? Thomson
7] Who discovered the proton and nucleus? Rutherford
8] Who first put elements in the periodic table based on their chemical properties?
Mendeleev
9] What are the seven diatomic molecules? Hydrogen, oxygen, nitrogen, fluorine, iodine,
chlorine, bromine [HONFIClBr]
10] Why are these seven molecules diatomic? They bond to themselves when they are not
bonded to other atoms – They form X2 molecules in the free state.
11] How many oxygen atoms are in:
a] Ca(NO3)2
6
b] 3H2O 3
c] MgSO4∙7H2O 11
d] 3Ga2(SO4)3 36
12] Changing the number of protons in the nucleus changes the: atom
13] Changing the number of neutrons in the nucleus changes the: isotope (mass number)
14] Changing the number of electrons changes the: ion/charge/oxidation number
15] a] On the periodic table, where are the metals? Left of the staircase
b] Where are the non-metals? Right of the staircase
c] Where are the metalloids?
Along the edge of the staircase
16] Identify the metalloids: Si, Ge, As, Sb, Te, Po, At
17] If Atom Q has 4 isotopes, 86, 88, 89 and 90 with percent abundances of 0.04%,
0.16%, 5.90 % and 93.90% respectively, what is it’s atomic mass (round to the
hundredths)? 89.94 amu
18] a] What are periods on the periodic table? Elements in the same row
b] What are groups on the periodic table? Elements in the same column
19] a] What are alkali metals? 1A
b] What are alkali-earth metals? 2A
c] What the halogens? 7A
d] What are the noble gases? 8A
e] What are the transition metals? Between the 2A’s and 3A’s
f] What are
the rare-earth metals? Bottom of the periodic table
20] What is the preferred ion for:
a] Ga +3
b] Ba +2
c] P -3
d] F -1
e] O-2
21] Predict the formula for:
a] aluminum and iodine AlI3
b] calcium and chlorine CaCl2
c] barium and nitrogen Ba3N2
d] magnesium and oxygen MgO
e] sodium and phosphorus Na3P
22] What do the A and Z values represent?
A = mass number and isotope – number of protons + neutrons;
Z = atomic number – number of protons
23] Complete the table below:
complete the following chart:
element
number of protons
number of neutrons
19 -1
F
9
10
f] K +1
number of electrons
10
9
57
Fe+2
26
65
26
29
+2
___Cu____
29
75
31
-3
As
36
33
24
27
42
36
33
82
210
128
78
+4
Pb
82
115 In
49
49
235
66
92
143
86
138
51
88
+4
U
92
224
Rn
86
0
86