Question 1

Question

Looking at the periodic table, determine the number of valence electrons present in a following neutral atoms.

Column A
1.
Oxygen (O):
h
Oxygen (O)
2.
Aluminium (Al):
Aluminium (Al)
3.
Neon (Ne):
Neon (Ne)
4.
Silicion (Si):
Silicion (Si)
5.
Magnesium (Mg):
Magnesium (Mg)
6.
Iodine (I):
Iodine (I)
7.
Lithium (Li):
Lithium (Li)
8.
Nitrogen (N):
Nitrogen (N)
Column B
a.1 valence electrons
b.5 valence electrons
c.3 valence electrons
d.7 valence electrons
e.2 valence electrons
f.6 valence electrons
g.4 valence electrons
h.8 valence electrons
Question 2
Looking at the periodic table, determine the charge each atom will make when it bonds with other atoms.

Column A
Column A
1.
Calcium (Ca):
Calcium (Ca)
2.
Francium (Fr):
Francium (Fr)
3.
Bromine (Br):
Bromine (Br)
4.
Sulfur (S):
Sulfur (S)
5.
Xenon (Xe):
Xenon (Xe)
6.
Carbon (C):
Carbon (C)
7.
Phosphorous (P):
Phosphorous (P)
8.
Boron (B):
Boron (B)
Column B
Column B
a.+4/-4
b.+3
c.-3
d.+1
e.+2
f.0
g.-2
h.-1
Question 3
Match the following terms to the correct definition

Column A
1.
chemical change:
chemical change
2.
physical change:
physical change
3.
chemical reaction:
chemical reaction
4.
Law of Conservation of Mass:
Law of Conservation of Mass
5.
chemical equation:
chemical equation
Column B
a.States that mass is neither created nor destroyed by chemical reactions or physical transformations
b.a change in which the chemical makeup of the substance is not changed
c.a process that produces a chemical change, in which substances are changed into new substances
d.a representation of a chemical reaction using chemical symbols and numbers
e.a change that takes place when atoms of one or more substances are rearranged into new combinations, forming one or more new substances

Answer 1

Question 1: Valence Electrons

1. Oxygen (O): 6 valence electrons (f)
2. Aluminium (Al): 3 valence electrons (c)
3. Neon (Ne): 8 valence electrons (h)
4. Silicon (Si): 4 valence electrons (g)
5. Magnesium (Mg): 2 valence electrons (e)
6. Iodine (I): 7 valence electrons (d)
7. Lithium (Li): 1 valence electron (a)
8. Nitrogen (N): 5 valence electrons (b)

Question 2: Charge when Bonding

1. Calcium (Ca): +2 (e)
2. Francium (Fr): +1 (d)
3. Bromine (Br): -1 (h)
4. Sulfur (S): -2 (g)
5. Xenon (Xe): 0 (f)
6. Carbon (C): +4/-4 (a)
7. Phosphorous (P): +3 (b)
8. Boron (B): +3 (b)

Question 3: Definitions

1. chemical change: e. a change that takes place when atoms of one or more substances are rearranged into new combinations, forming one or more new substances
2. physical change: b. a change in which the chemical makeup of the substance is not changed
3. chemical reaction: c. a process that produces a chemical change, in which substances are changed into new substances
4. Law of Conservation of Mass: a. States that mass is neither created nor destroyed by chemical reactions or physical transformations
5. chemical equation: d. a representation of a chemical reaction using chemical symbols and numbers