1. Simplified (empirical) ratio: Ratio by mass:% of each element by mass: Fraction of total mass: The object of the game is to collect complete families. The player whose turn it is asks another player for a specific card from the same family as a card that the player already has. If the asked player has the card, they must give it to the requester and the requester can then ask any player for another card. If the asked player does not have the card (or they do have the card but the requester’s maths was wrong), it becomes the next persons go to ask for cards. Play continues in this way until no families are separated among different players. The player with the most cards wins.

2. Molecular Formula RatioEmpirical formula Simplified Ratio Ratio of masses Fraction of total mass for each element % by massRelative molecular mass (amu) C3H6C3H6 3:6 CH 2 1:212:2 6:1 C: 85.7% H: 14.3%42 C 12 H 18 12:18 C2H3C2H3 2:324:3 8:1 C: 88.9% H: 11.1%162 C 6 H 12 O 6 6:12:6 CH 2 O 1:2:112:2:16 6:1:8 C:40% H 6.7% O: 53.3% 180 C6H6C6H6 6:6 CH 1:112:1 C: 92.3% H: 7.7%78 CaCO 3 1:1:3 CaCO 3 1:1:340:12:48 10:3:12 Ca: 40% C: 12% O: 48% 100 SiH 4 1:4 SiH 4 1:428:4 7:1 Si: 87.5% H: 12.5%32

3. Molecular Formula RatioEmpirical formula Simplified Ratio Ratio of masses Fraction of total mass for each element % by massRelative molecular mass (amu) C2H8N2C2H8N2 2:6:2 CH 4 N 1:4:112:4:14 6:2:7 C:40% H: 13.3% N: 46.7% 60 CH 4 1:4 CH 4 1:412:4 3:1 C: 75% H: 25%16 C2H6O2C2H6O2 2:6:2 CH 3 O 1:3:112:3:16 C: 38.7% H: 9.7% O: 51.6% 62 C2H6C2H6 2:6 CH 3 1:312:3 4:1 C: 80% H: 20%30 C 10 H 8 10:8 C5H4C5H4 5:460:4 15:1 C: 93.75% H: 6.25%128 C2H2O4C2H2O4 2:2:4 CHO 2 1:1:212:1:32 C: 26.7% H: 2.2% O: 71.1% 90