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CREDITS: returnofthestudysheet
1)_____________ is the smallest particle of an element that retains its properties
2) the 3 particles of an atom are ____________, ____________, ____________, with charges
____________, ____________,____________ respectively
3) the number of ____________ determines which element it is
4) The ____________ and ____________ are located in the nucleus
5) The charge of a proton and electron are respectively +/- ____________
6) These two are almost the same size: ____________ and ____________
7) Mass number is _________________________________________________________________
8) Atomic number is ____________________________________________
9) # of protons = _______________________________________
10) Atomic mass is the __________________________________________________________________
11) Isotopes are diff. forms of the same element that have the same number of ____________
(____________) but a diff amount of ____________ in their nucleus, therefore having diff
____________
12) Atomic Mass: _____________ *______________ (repeat)
Give the number of protons in all of the following
Krypton _________________
Copper ___________________
Hydrogen __________________
Sodium ____________________
Bromine ___________________
Iron ________________________
Give the number of electrons in an atom of the following:
Potassium ____________________
Boron _____________________
Iodine _____________________
Uranium __________________
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Give the number of neutrons in one atom of the following:
You can do this by _______________________________
Fluorine ________________
Boron ___________________
Magnesium ________________
Silver _____________________
Fill out the table
Isotope name
Nuclear
symbol
Atomic
number
Mass
number
# of protons
201
80
# of
electrons
# of
neutrons
Calcium -40
197/79Au
17
18
26
30
The number after the isotope name is the ________________ __________________________________
Nuclear symbol: The top number is the ________________ __________________________________
The bottom number is the ________________
__________________________________
Mass is measured in __________
Mass is in u? idk
Calculate the following
1) C-12 has a nat. abundance of 98.89% and C-13 has a nat. abundance of 1.11% , the mass of C-12 is
12.000u (amu) ; the mass of C-13 is 18.0003 u, how do we calculate the atomic mass?
__________________________________
2) Calculate the avg atomic mass for neon if its nat abundance is 90.5% neon- 20 and 0.3% neon- 21 ,
and 9.2% neon 22
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__________________________________
DON’T FORGET TO PUT PERCENT IN DECIMAL FORM (divide by 100!!!)
3) Calculate the avg atomic mass of silver if 13 out of 25 atoms are silver-107 and 12 of 25 atoms are
silver -109
__________________________________
Work with the following isotopes:
12/6 C
13/6 C
14/6 C
(write out here )
1) The element is ____________________
2) The number 6 is the ____________________
3) The numbers 12, 13, 14 are ____________________
4) How many protons & neutrons are in each isotope
____________________
____________________
____________________
1) Give the number of protons (p), electrons (e), and neutrons (n) in one atom of chlorine-37.
______________
2) An atom of the isotope sulfur-31 consists of how many protons, neutrons, and electrons?
_____________
3) How many neutrons are there in an atom of lead whose mass number is 208?
______________
4) Atoms of the same element with different mass numbers are called
______________
5) How many protons and electrons are present in one Br– ion?
______________
6) An oxide ion, O2–, has
______________
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7) A magnesium ion, Mg2+, has
______________
Solve these , show work
1) The nat abundance for boron isotopes is 19.9% (10.013 amu) and 80.1 % B-11 (11.009 amu) .
Calculate the atomic mass of boron
______________
2) Calculate the mass of silicone using the following data for percent nat abundance and mass of
each isotope
92.23% si 28 (27.9769 amu) ; 4.67% si- 29 (28.9765); 3.10% si- 30 (29.9738 amu)
______________
3) Magnesuim consists of 3 isoptopes with masses of 24 (78.5%), 25 (10%), and 26 (11.5%) . what is
the atomic mass of magnesium?
______________
4) Thallium has two stable isotopes 203Ti and 205Ti . Knowing that the atiomic mass of taillium is
204.4, which isotope is the more abundant of the two
______________

abundant mass is the _________________ mass
__________________________________

Fill out the chart
Atoms quickly loose of gain ______________
If electrons are added or removes, the result is an ______________
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An ion with pos. charge is ______________
An ion with neg charge is an ______________
Symbol
Name
Type?
more or less e
than atom
Number of e
gained or lost
Na+
FCr3+
S2Co2+
I-
Chemical reactions
In a chemical reaction The symbol “+” represents ________________________
The arrow points to the _______________________________________
Left of arrow: ______________ ____________ ; Right of arrow ________________________ numbers:
__________________________
Atoms are neither created nor destroyed!!!
When balancing equations, ______________ should NEVER be changed _
Balance these [:
1) S₈+O₂ SO₃
______________
2) Na+H₂O NaOH + H₂
_______________
3) FeS₂+O₂Fe₂O₃+SO₂
_______________
4) SiCl₄ + H₂O  H₄SiO₄ +HCl
_________________
5) CO₂ + NH₃  OC (NH₂)₂ + H₂0
_________________
6) Al (OH)₃ + H₂SO₄  Al₂ (SO₄)₃ + H₂O
_________________
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7) Fe₂(SO₄)₃+KOH  K₂SO₄ + Fe(OH)₃
__________________
8) H₂SO₄ + HIH₂S+ I₂ + H₂O
_________________
9) C₇H₁₆ +O₂  CO₂ + H₂
_________________
10) C₃H₈ + O₂  CO₂ + H₂O
_________________
11) Fe₂O₃ + CO  Fe + CO₂
_________________
12) PCl₅ + H2O  HCl + H₃PO₄
__________________
13) Fe + H₂O  Fe₃O₄ + H₂
__________________
14) Al + O₂  Al₂O₃
__________________
15) Al₂(SO₄)₃ + Ca(OH)₂  Al (OH)₃ + CaSO₄
____________________
16) FeCl₃ + NH₄OH  Fe(OH)₃ + NH₄Cl
___________________
17) Ca₃(PO₄)₂ + 6 SiO₂  P₄O₁₀ + CaSiO₃
___________________
18) N₂O₅ + H₂O  HNO₃
___________________
19) Al + HCl  AlCl₃ + H₂
______________________
20) H₃BO₃  H₄B₆O₁₁ + H₂
_______________________
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Fill in the blanks and label :
1) This reaction breaks things down. Single compound broken down into 2 or more products:
_____________. It is in the form _____________
This reactions unites 2 things to make a new thing: ____________. It is in the form
_____________
2) One element replaces another in a reaction_____________ . It’s in the from _____________
_________________________________________
3) Switching of partners in a reaction: _____________. It’s in the form: _____________
4) A COMBUSTION REACTION is in the form of __________________________________
Label these by the type of reaction that they are
1. HgOHg+O₂
________________________________
2. Na+H₂O NaOH + H₂
________________________________
3. LiOH + HCl  LiCl + H₂O
________________________________
4. S₈ +O₂ SO₃
________________________________
5. Fe +O₂ Fe₂O₃
________________________________
6. NH₄Cl +AgNO₃  NH₄NO₃ + AgCl
________________________________
7. H₂O₂  H₂O +O₂
________________________________
8. C₇H₁₆O₂+ O₂ CO₂ + H₂O
________________________________
9. H₂S +C; ₂S₈ +HCl
________________________________
10. Mg+H₂SO₄ MgSO₄ + H₂
________________________________
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11. P₄O₁₀ +H₂OH₃PO₄
________________________________
12. C₇H₁₆ + O₂  CO₂+H₂O
________________________________
13. ZnCl₂ +Na₂CO₃ NaCl+ ZnCO₃
________________________________
Answer these
1. To find the most common anion of cation of an element , we look at the ___________ and
_____________. It is the____________________________
2. An element , adter making ionic bondsm usually aquires a charge equal to the
________________________
Build a formula by combining the common cation and /or anion of each pair below
1. Calcium and Clorine
___________
2. Magnesium and oxygen
____________
3. Aluminum and Sulfate
____________
DON’T FORGET PARENTHASIS!!!
4. Calcium and oxygen
_____________
5. Hydrogen and chlorine
_____________
6. Sodium and Chlorine
_____________
Final practice
a) When the equation Al + Br2 ➔ AlBr3 is balanced, the coefficient for Al is
__________
b) An equation is balanced by
___________________
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c) During a chemical reaction
___________________
d) The substances formed as a result of a chemical reaction are called reactants (t/f)
__________________
e) Isotope abundance is the
__________________________________________________________________________
relative percentage of the isotopes in an element
f)
Law of conservation of matter states the ___________________________________ and this
relates to this topic becous
______________________________________________________________________________
________________________
matter cannot be created or destroyed ; it proves why subscripts cannot be changes
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