Chapter 4 Questions Chapter 5 Questions
What is:
a) C for Carbon 12.01, 6
b) He for Helium 4.003, 2
c) Na for Sodium 22.99, 11
d) Ca for Calcium 40.08, 20
e) Al for Aluminum 26.98, 13
What is the atomic symbol, mass, and atomic number for each of the following (question 4.9)
a) Group 4A, Period 2
b) The noble gas in Period 1
c) The alkali Metal in Period 3
d) Group 2A Period 4
e) Group 3A Period 3
answer to question 5.1....What is
a) alpha particle
b) positron
c) gamma radiation
answer to question 5.5...What is
a) Beta
b) Helium or alpha particle
c) A neutron
d) Argon isotope 18, 38
Question 5.1 on page 139
Question 5.5 on page 140
What is
a) Ar 18atomic number and 36atomic mass, Ar 18atomic number, and 38atomic mass, and Ar 18atomic number and 40atomic mass
b) All isotopes of the same element have the same number of protons so they have the same atomic number
c) the number of neutrons is different so the atomic mass is different
d) The atomic masses on the periodic table are averages of the different isotopes
e) Of those listed isotope 40 would be the most abundant because it is the closest to the atomic mass listed on the periodic table
Argon has three naturally occurring isotopes, with mass numbers 36, 38, and 40 (question 4.37)
a) Write the atomic symbol for each of these atoms
b) How are these isotopes alike?
c) How are they different?
d) Why is the atomic mass of argon listed on the periodic table not a whole number?
e) Which isotope is the most abundant in a sample of argon?
see answers on the board
Write a balanced equation for each of the following (question 5.61)
a) Th-225 (alpha decay)
b) Bi-210 (Beta decay)
c) Cesium-137 (Beta decay)
d) Tin-126 (Beta decay)
e) F-18 (B+ emission)
What is
a) 2, 4
b) 2, 8, 8
c) 2, 8, 8, 1
d) 2, 8, 4
e) 2
f) 2, 7
Write the electron arrangement for each of the following? (question 4.49)
a) Carbon
b) Argon
c) Potassium
d) Silicon
e) Helium
f) Nitrogen
What is 9 days
How many days will it take until the activity of the Tl-201 in Simone's body is one-eighth of the initial activity? Note: the half life of Tl is-201 is 3 days
a) false
b) true
c) true
d) false
e) true
Which of the following statements a to e are true and which are false? (question 4.73)
An atom of N compared to an atom of Li has a larger (greater)
a) atomic size
b) ionization energy
c) number of protons
d) metallic character
e) number of valence electrons
What is 4.4 x 10^3Bq
The activity of K-40 in a 70kg human body is estimated to be 120nCi. What is teh activity in becquerels? Show your work
Use table 5.4 on page 148
(question 5.73)
See the board
Fill out the table on page 132 question 4.101
What is 64microCi
The half-life for the radioactive decay of Calcium-47 is 4.5 days. If a sample has an activity of 1.0uCi after 27 days, what was the initial activity, in microcuries of the sample (assume linear decay, not exponential) and use the formula:
Af = 2Ai^(time/halflife)
Show all of your work

Chemistry Test#2

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