Operation: Decorate the Christmas Tree!
Begin your journey through four festive missions, Balls, Stars, Lights, and Ribbons, each filled with Christmas-themed chemistry puzzles that test your wit and holiday spirit. Complete all missions to earn the magical ornaments needed to decorate the tree and restore Christmas cheer to the North Pole!
Start
Missions
4. Ribbons
1. Balls
2. Stars
3. Lights
Question 1/3
Correct!
Convert molecules to moles using Avogadro’s number: moles = particles ÷ (6.022 x 10^23) (3.00 x 10^23) ÷ (6.022 x 10^23) = 0.199… ≈ 0.200 mol
Next
Question 2/3
Correct!
Step 1: Add candy per stocking12.50 + 7.2 = 19.7 g (1 decimal place) Step 2: Multiply by 9 19.7 × 9 = 177.3 → 3 sig figs → 177 g
next
Question 3/3
Correct!
next
Convert the mass of AgCl to moles using its molar mass. Use the 2:1 ratio from the balanced equation to find moles of 𝑀𝐶𝑙2 (divide moles of AgCl by 2). Find the molar mass of 𝑀𝐶𝑙2 by dividing the sample mass by the moles of 𝑀𝐶𝑙2 Subtract the mass of two Cl atoms from 𝑀𝐶𝑙2 to get the atomic mass of 𝑀 Match that mass to the periodic table → the value corresponds to Fe, so Fe is the answer.
Incorrect! You receive coal.
Back
Gifts for decorating!
Follow
Missions
4. Ribbons
1. Balls
2. Stars
3. Lights
Question 1/3
Correct!
Volume displaced = 28.5 mL – 22.0 mL = 6.5 mLDensity = mass ÷ volume = 48.6 g ÷ 6.5 mL = 1.82 g/mL
next
Question 2/3
Correct!
Convert % to grams → to moles → then simplify the ratio: C: 52.2 g ÷ 12.01 ≈ 4.35 mol H: 13.1 g ÷ 1.008 ≈ 13.0 mol O: 34.7 g ÷ 16.00 ≈ 2.17 mol Divide all by the smallest (2.17): C: 4.35 ÷ 2.17 ≈ 2 H: 13.0 ÷ 2.17 ≈ 6 O: 2.17 ÷ 2.17 ≈ 1 → C₂H₆O
Follow
Question 3/3
Correct!
Lattice energy increases with small ions + high charge. Li⁺ and F⁻ are the smallest ions listed.
Follow
Incorrect!
List of naughty children
Back
Gifts for decorating!
Follow
Missions
4. Ribbons
1. Balls
2. Stars
3. Lights
Question 1/3
Correct!
Ammonium = NH₄⁺ and carbonate = CO₃²⁻ → need 2 ammonium ions: (NH₄)₂CO₃
next
Question 2/3
Correct!
Cl is –1. Three Cl⁻ = –3 total, so Fe must be +3
next
Question 3/3
Correct!
Melting ice is an endothermic process, which means it absorbs heat from the surroundings, so the enthalpy of the ice increases as it turns into liquid water.
next
Incorrect! You lose gifts.
Back
Gifts for decoration!
Follow
Missions
4. Ribbons
1. Balls
2. Stars
3. Lights
Question 1/3
Correct!
next
Al-O is the least polar because the shared electron pair is not strongly pulled to oxygen. This means there is only a small difference in charge and thus the bond is not very polar. Mg-O has moderate polarity because they have a stronger dipole than Al-O but still not the largest separation of charges. Na-O represents the most ionic bond and thus has the largest charge separation. Therefore, Na-O is the most polar bond represented
Question 2/3
Correct!
Neon is a noble gas, nonpolar, with almost no intermolecular forces. This is ideal gas behavior at STP.
next
Question 3/3
Correct!
N₂H₄: 2x +4(+1) = 0 so x = -2 NO: x + (-2) = 0 so x = +2 HNO₃: (+1) + x + 3(-2) = 0 so x = +5
next
Incorrect! Fireplace is on.
Back
Gifts for decorating!
Follow
Missions
4. Ribbons
1. Balls
2. Stars
3. Lights
Decorate
Merry Christmas!
Do you want to exit without decorating your Christmas tree?
Exit
Back
Avogadro's Army - Operation: Decorate the Christmas Tree!
Elise Welfare
Created on November 4, 2025
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Transcript
Operation: Decorate the Christmas Tree!
Begin your journey through four festive missions, Balls, Stars, Lights, and Ribbons, each filled with Christmas-themed chemistry puzzles that test your wit and holiday spirit. Complete all missions to earn the magical ornaments needed to decorate the tree and restore Christmas cheer to the North Pole!
Start
Missions
4. Ribbons
1. Balls
2. Stars
3. Lights
Question 1/3
Correct!
Convert molecules to moles using Avogadro’s number: moles = particles ÷ (6.022 x 10^23) (3.00 x 10^23) ÷ (6.022 x 10^23) = 0.199… ≈ 0.200 mol
Next
Question 2/3
Correct!
Step 1: Add candy per stocking12.50 + 7.2 = 19.7 g (1 decimal place) Step 2: Multiply by 9 19.7 × 9 = 177.3 → 3 sig figs → 177 g
next
Question 3/3
Correct!
next
Convert the mass of AgCl to moles using its molar mass. Use the 2:1 ratio from the balanced equation to find moles of 𝑀𝐶𝑙2 (divide moles of AgCl by 2). Find the molar mass of 𝑀𝐶𝑙2 by dividing the sample mass by the moles of 𝑀𝐶𝑙2 Subtract the mass of two Cl atoms from 𝑀𝐶𝑙2 to get the atomic mass of 𝑀 Match that mass to the periodic table → the value corresponds to Fe, so Fe is the answer.
Incorrect! You receive coal.
Back
Gifts for decorating!
Follow
Missions
4. Ribbons
1. Balls
2. Stars
3. Lights
Question 1/3
Correct!
Volume displaced = 28.5 mL – 22.0 mL = 6.5 mLDensity = mass ÷ volume = 48.6 g ÷ 6.5 mL = 1.82 g/mL
next
Question 2/3
Correct!
Convert % to grams → to moles → then simplify the ratio: C: 52.2 g ÷ 12.01 ≈ 4.35 mol H: 13.1 g ÷ 1.008 ≈ 13.0 mol O: 34.7 g ÷ 16.00 ≈ 2.17 mol Divide all by the smallest (2.17): C: 4.35 ÷ 2.17 ≈ 2 H: 13.0 ÷ 2.17 ≈ 6 O: 2.17 ÷ 2.17 ≈ 1 → C₂H₆O
Follow
Question 3/3
Correct!
Lattice energy increases with small ions + high charge. Li⁺ and F⁻ are the smallest ions listed.
Follow
Incorrect!
List of naughty children
Back
Gifts for decorating!
Follow
Missions
4. Ribbons
1. Balls
2. Stars
3. Lights
Question 1/3
Correct!
Ammonium = NH₄⁺ and carbonate = CO₃²⁻ → need 2 ammonium ions: (NH₄)₂CO₃
next
Question 2/3
Correct!
Cl is –1. Three Cl⁻ = –3 total, so Fe must be +3
next
Question 3/3
Correct!
Melting ice is an endothermic process, which means it absorbs heat from the surroundings, so the enthalpy of the ice increases as it turns into liquid water.
next
Incorrect! You lose gifts.
Back
Gifts for decoration!
Follow
Missions
4. Ribbons
1. Balls
2. Stars
3. Lights
Question 1/3
Correct!
next
Al-O is the least polar because the shared electron pair is not strongly pulled to oxygen. This means there is only a small difference in charge and thus the bond is not very polar. Mg-O has moderate polarity because they have a stronger dipole than Al-O but still not the largest separation of charges. Na-O represents the most ionic bond and thus has the largest charge separation. Therefore, Na-O is the most polar bond represented
Question 2/3
Correct!
Neon is a noble gas, nonpolar, with almost no intermolecular forces. This is ideal gas behavior at STP.
next
Question 3/3
Correct!
N₂H₄: 2x +4(+1) = 0 so x = -2 NO: x + (-2) = 0 so x = +2 HNO₃: (+1) + x + 3(-2) = 0 so x = +5
next
Incorrect! Fireplace is on.
Back
Gifts for decorating!
Follow
Missions
4. Ribbons
1. Balls
2. Stars
3. Lights
Decorate
Merry Christmas!
Do you want to exit without decorating your Christmas tree?
Exit
Back