Charge Power Slides Charge Power
Force Fields: Lesson 01
The Big Question
In your chemistry model, you've seen atoms held together.
"What determines how strongly two charged particles pull on or push each other?"
Meet the Players
The Proton
Positive Charge (+q)
-
The Electron
Negative Charge (-q)
Does "Strength" Matter?
+1
-1
Standard Pull
+2
STRONGER
-2
Double the Pull!
Charge Rule
The more charge you have, the stronger the force.
q ↑
Charge Up
F ↑
Force Up
This is a DIRECT relationship.
Quick Predict
If I have a +1 proton and -1 electron, let's call that force "1 Force Unit".
What happens if I change the proton to +3?
Force stays the same
Force triples (3x)
Charge Power Worksheet Charge Power
Coulomb's Law: Investigation 01
Name:
Date:
Part 1: The Base Model
In the diagrams below, we represent the electrostatic force as Force Arrows . The longer the arrow, the stronger the force. The base model shows a +1 proton and a -1 electron at a set distance.
+1
Charge A
1 Force Unit
-1
Charge B
Part 2: Magnifying Charge
Predict the new force units based on the changes to the charge magnitude. Keep the distance the same as the base model.
+2
-1
What is the new force strength?
Force Units
+3
-1
What is the new force strength?
Force Units
+2
-2
Hint: Multiply both charges together.
Force Units
Part 3: The Pattern
Explain why doubling the charge of one particle doubles the force, while doubling the charge of both particles quadruples (4x) the force.
Charge Power Answer Key Answer Key
Charge Power: Investigation 01
TEACHER RESOURCE
Part 2: Prediction Results
Question 1: (+2) and (-1)
Calculation: 2 × 1 = 2
2 Force Units
Question 2: (+3) and (-1)
Calculation: 3 × 1 = 3
3 Force Units
Question 3: (+2) and (-2)
Calculation: 2 × 2 = 4
4 Force Units
Part 3: The Pattern (Sample Explanation)
"According to Coulomb's Law, the force is proportional to the product of the two charges (q₁ × q₂). When only one charge doubles, we are multiplying the force by 2. When both charges double, we are multiplying the force by 2 twice (2 × 2), which results in a force that is 4 times stronger."
Instructional Strategy
Focus on the word direct—as charge magnitude increases, force increases.
Help students visualize that a +2 charge is like having two +1 protons acting together in the same spot.
Watch for students who want to add the charges (e.g., thinking 2 + 2 = 4 instead of 2 × 2 = 4). Use the +2 and -1 example to show that 2 × 1 = 2, but 2 + (-1) = 1.
Math Mission Slides Level 3
Math Mission
Force Fields: The Full Equation
The Full Formula
Coulomb's Law
F =
q₁ q₂
d²
Top Side
Multiplication (Magnifies!)
Bottom Side
Division (Weakens!)
2 Mission Objectives
Step 1
Multiply the Charges together to get your "Power Up".
Step 2
Divide by the Square of the Distance.
Live Mission: The Oxygen Ion
THE SCENARIO
An Oxygen Nucleus (+8) pulls on
1
8 × 2 = 16 (Numerator)
2
2² = 4 (Denominator)
3
16 ÷ 4 = 4 Force Units!
Result: Even with more distance, the force is 4x stronger!
Mission Advice
Don't forget the exponent!
2 becomes 4. 4 becomes 16. Squaring distance is the key.
Fractional Distances
If distance is 0.5x, then d² is 0.25. Dividing by a decimal is TOUGH!
Math Mission Worksheet Math Mission
Coulomb's Law: Mastery Practice 03
Mission Operative:
Date:
The Formula
F =
q₁ q₂
d²
"When predicting the new force relative to the old one, we use ratio units. Assume the initial force is 1."
Mission Level 1: Heavy Nucleus
A nucleus grows from +1 to +12. The distance remains the same.
Difficulty
Step 1: (q₁ × q₂)
Step 2: (d²)
Final Force Change
Mission Level 2: The Micro Gap
Charges remain the same (+1 and -1), but the distance is cut to one-quarter (0.25x).
Difficulty
Step 1: Charge Multiplier
Step 2: Distance Square (d²)
Final Force Change
Hint: Dividing by a decimal smaller than 1 makes the answer much bigger!
Level 3: Multi-Shift
Charge A is 6x, Charge B is 2x, and Distance is doubled (2x).
Difficulty
Step 1: (q₁ × q₂)
Step 2: (d²)
Final Force Change
Boss Level: Paradox Mission
Charge A is halved (0.5x), Charge B is halved (0.5x), and Distance is halved (0.5x).
DEATH MARCH
Step 1: (q₁ × q₂)
Step 2: (d²)
Final Ratio
Mission Outcome: Use decimals and fractions. Show your work on the back if you need more space!
Math Mission Answer Key Mission Log: Key
Math Mission: Investigation 03 (Rigorous)
TEACHER RESOURCE
Level 1: Heavy Nucleus
Charge Multiplier
12 × 1 = 12
Distance Square
1² = 1
Final Ratio
12x Units
Level 2: The Micro Gap
Charge Multiplier
1 × 1 = 1
Distance Square
0.25² = 0.0625
Final Ratio
16x Units
Teacher Note: 1 / 0.0625 is the same as 1 / (1/16), which equals 16. Help students visualize that moving 4x closer makes force 16x stronger.
Level 3: Multi-Shift
Charge Multiplier
6 × 2 = 12
Distance Square
2² = 4
Final Ratio
3x Units
Boss Level: Paradox Mission
Charge Multiplier
0.5 × 0.5 = 0.25
Distance Square
0.5² = 0.25
Final Ratio
0.25 / 0.25 = 1x
The Paradox! Decreasing both charges by half makes the force 4x weaker. However, moving them half the distance closer makes the force 4x stronger. These two changes perfectly cancel out, leaving the force exactly as it started.
Teaching Strategy
Level 4 is designed to blow minds. Use it to show that even though variables change, the net effect can be zero. This is a common pattern in equilibrium and steady-state chemical systems.
Atomic Pull Slides Atomic Pull
Force Fields: Periodicity
Why do atoms care?
Coulomb's Law isn't just a math trick. It's the reason why everything exists.
Atomic Size
How tight does the nucleus hug its electrons?
Ionization Energy
How hard is it to steal an electron away?
The Periodic Pull
Across a Period
Nuclear charge (q₁) increases.
Nucleus Pulls Harder
Down a Group
Distance (d) increases with more shells.
Nucleus Pulls Weaker
Atomic Size
Li
+3 Nucleus
F
+9 Nucleus
"More protons in the middle (+9) pull the electrons in TIGHTER than +3 can."
Coulomb's Final Check
Scenario:
Francium (Fr) is at the bottom of the table. It has many electron shells (high distance).
Predict
Weak nucleus pull. Large atomic size. Easy to steal electrons.
Why?
High distance (\(d\)) means force (\(F\)) crashes!
Atomic Pull Worksheet Atomic Pull
Coulomb's Law: Application 04
Student:
Date:
Part 1: The Force in the Table
Circle the correct word to complete the logic chain for each periodic trend.
Across a Row (Period)
"As you move from Left to Right, the number of protons increases..."
Charge (q) is:
Decreasing Increasing
Force (F) is:
Stronger Weaker
Down a Column (Group)
"As you move down, more electron shells are added..."
Distance (d) is:
Decreasing Increasing
Force (F) is:
Stronger Weaker
Part 2: Head-to-Head
Lithium (Li) vs. Oxygen (O)
They are in the same row. Oxygen has more protons.
Which atom has a stronger pull on its electrons?
Which atom will be SMALER in size?
Lithium (Li) vs. Cesium (Cs)
They are in the same column. Cesium is further down.
Which atom has a weaker pull on its valence electrons?
Which atom is easier to steal an electron from?
The Ultimate Goal
Explain why Fluorine (F) is the "greediest" element (it pulls on electrons harder than almost any other element).
Atomic Pull Answer Key Answer Key
Atomic Pull: Investigation 04
TEACHER RESOURCE
Part 1: The Force in the Table
Across a Row (Period):
Charge: Increasing
Force: Stronger
Down a Column (Group):
Distance: Increasing
Force: Weaker
Part 2: Head-to-Head Results
Li vs. O
Stronger Pull:
Oxygen (O)
Smaller Atom:
Oxygen (O)
Li vs. Cs
Weaker Pull:
Cesium (Cs)
Easier to Steal:
Cesium (Cs)
Synthesis: Fluorine
"Fluorine has a high nuclear charge (q = +9) relative to its row, which pulls hard. More importantly, it is extremely small (low distance d), meaning the electrons are very close to the nucleus. Because distance is squared in the denominator, being very small makes the force exponentially stronger. This is why Fluorine has such high electronegativity."
Focus on the "why": Always link the chemistry trend back to Charge (q) or Distance (d).
Space Gap Slides Space Gap
Force Fields: Lesson 02
The Distance Problem
If you move two magnets further apart, what happens to the pull?
"Does the force get slightly weaker, or DOES IT CRASH?"
The Inverse Rule
-
Close Together
Strong Force
-
Far Apart
Weak Force
The Square Secret
Distance doesn't just divide the force... it divides by the SQUARE.
d = 2x
Double Distance
F ÷ 4
4x Weaker Force
Wait, where did the 4 come from? (2² = 4!)
Why Division?
Charge (Multiply)
"Adding more fuel to the fire makes it hotter."
Multiplication = Bigger
Distance (Divide)
"Moving away from the fire makes you colder."
Division = Smaller
Predict the Drop
If I move the particles 3 times further away...
By what number do I divide the force?
3
Just Distance
9
Distance Squared (3²)
Space Gap Worksheet Space Gap
Coulomb's Law: Investigation 02
Name:
Date:
"Charge multiplies force, but distance divides force by its square (\(d^2\))."
Part 1: The Squaring Skill
To find the "Space Factor", square the distance change.
Distance Change
2x
Space Factor (\(d^2\))
4
Distance Change
3x
Space Factor (\(d^2\))
Distance Change
4x
Space Factor (\(d^2\))
Distance Change
5x
Space Factor (\(d^2\))
Part 2: Predicting the Force
In the base model, two charges create 100 Force Units . What happens to the force if we change the distance?
Distance is doubled (2x further apart)
Operation: 100 ÷ 4 = _____
Units
Distance is tripled (3x further apart)
Operation: 100 ÷ ____ = _____
Units
Distance is cut in half (0.5x closer)
Challenge: If dividing by distance squared makes it smaller, what happens when you get closer?
Units
The "Why"
Think about gravity (which follows the same rule). Why does a rocket ship feel so much less pull from Earth once it gets just a little bit higher into space?
Space Gap Answer Key Answer Key
Space Gap: Investigation 02
TEACHER RESOURCE
Part 1: The Squaring Skill
2x
4
3x
9
4x
16
5x
25
Part 2: Prediction Results
2x distance
Calculation: 100 ÷ 2² = 100 ÷ 4
25 Units
3x distance
Calculation: 100 ÷ 3² = 100 ÷ 9
11.1 Units
0.5x Distance (The Challenge)
Calculation: 100 ÷ (0.5)² = 100 ÷ 0.25 = 400.
400 Units
Misconception Alert: Division by 0.5
Students often struggle with the idea that dividing by a small number makes something bigger .
Visual Aid: "If you have 100 pizzas and you cut each one into 0.25 (quarters), you now have 400 pieces."
Chemistry Link: Moving closer exponentially increases the force. This is why protons and electrons stay locked in atoms!
