Download C1 - Day 3 - TavistockCollegeScience

DAY 2 – Answers
Atomic Structure, Compounds and Chemical Formulae
KEY
WORDS
Relative Charge  Mass Number  Energy Level or Shell 
Electronic Configuration  Compound  Chemical Formula 
Question
1
Answer:
What is the Relative Electrical Charge on Protons, Neutrons and Electrons?
Protons = Positive
Neutrons = Neutral
Electrons = Negative
2
Answer:
What is the Relative Mass on Protons, Neutrons and Electrons?
Protons = 1
Neutrons = 1
Electrons = 1/1860 (very little or negligible)
3
Answer:
4
Answer:
5
Answer:
6
Answer:
7
Answer:
8
Answer:
9
Answer:
10
Answer:
What is the Mass Number of an atom?
Number of Protons + Number of Neutrons
How do you calculate the number of neutrons in an atom?
Mass Number – Atomic Number
How many electrons can occupy the first or lowest energy level shell?
2
What is the maximum number of electrons in the next two shells?
8
What is the electron configuration of an atom of magnesium?
2,8,2
What is a compound?
Two (or more) different elements joined together chemically
What happens to electrons during chemical reactions?
They move between atoms (lost, gained or shared)
What does a chemical formula tell us?
What different elements are present in a compound and
the number of atoms of each element in the compound
DAY 3
Chemical Reactions and (HT) Balancing Equations
KEY
WORDS
Chemical Reaction  Reactants  Products  Mass Conservation 
Balanced 
Question
1
What does a word equation tell you?
Answer:
2
What substances are on the left side of the equation?
Answer:
3
What substances are on the right side of the equation?
Answer:
4
What must the total mass of reactants always equal?
Answer:
5
What happens to the number of atoms in a chemical equation?
Answer:
6
How many of each type of atom are present in CO2?
Answer:
7
Describe what has happened to the atoms in this reaction: H2 + O2  H2O
Answer:
8
Balance the equation in Question 7
Answer:
9
Answer:
Balance the following equation: Al + O2  Al2O3
10
Answer:
Balance the following equation: Cr + HCl  H2 + CrCl3