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Semester 1 Final Exam Review- Chemistry
Test Description: Chemistry
Instructions: Answer all questions to get your test result.
1) The average atomic mass for Barium is 137.327 amu. Which two isotopes do you think is in greater abundance?
A
Barium-138
B
Barium- 137
2) Who discovered the electron?
A
Rutherford
B
JJ Thomson
C
Robert Millikan
D
John Dalton
3) What family is Bromine a part of?
A
Alkaline Earth Metals
B
Rare Earth Metals
C
Halogen
D
Alkali Metals
4) Calculate the average atomic mass of lithium to the nearest thousandth, which occurs as two isotopes that have the following atomic masses and abundances in nature: 7.30% at 6.017 amu, and 92.70% at 7.018 amu.
A
9.788amu
B
6.000amu
C
7.945amu
D
6.945amu
5) What is the total number of electrons in an atom of Cu-65?
A
29
B
30
C
36
D
34
6) Atoms of different isotopes of the same element differ in their total number of
A
Electrons
B
Neutrons
C
Nucleus
D
Protons
7) Silicon belongs to which family?
A
none
B
Metals
C
Metalloids
D
Nonmetals
8) What is the equation to find out the charge of an ion?
A
p-e
B
n-p
C
e-p
D
n+p
9) What is the equation to calculate mass number?
A
n-e
B
p-e
C
p-n
D
n+P
10) For Ti-48, What is the mass number?
A
48
B
24
C
55
D
22
11) How many neutrons does Ti-48 have?
A
22
B
48
C
26
D
24
12) You start with 800 grams of a radioisotope. In 21 hours there are 100 grams left. How long is the half-life?
A
1
B
7
C
12
D
24
13) Which of the following is NOT a property of covalent bonding?
A
High Melting Point
B
Does not conduct electricity as a solid
C
Partially soluable
D
Low melting point
14) How many neutrons are there Ni-62?
A
34
B
2
C
28
D
62
15) Which best describes NaCl
A
Ionic
B
Diatomic Element
C
Covalent
D
Niether
16) If Mg had a charge of 2+, how many protons are there?
A
2
B
12
C
10
D
22
17) Which element is more electronegative?
A
Oxygen
B
Sodium
C
Aluminum
D
Francium
18) How many valence electrons does Boron have?
A
+3
B
4
C
3
D
1
19) The electron configuration for an atom is 1s2 2s2 2p6 . What is the element?
A
Fluorine
B
Oxygen
C
Chlorine
D
Neon
*select an answer for all questions
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