Rivkaaa wrote:I attended the Bayard Rustin invy on 01/05, and the proctors for CB included two crushed up metals as two powders. Is this allowed?
No, the rules state,"Qualitative Analysis: Participants will identify evidence (unknowns) by performing tests such as solubility, acidity, magnetic property, color, density, and odor. Every team will have the same set of unknowns (evidence). The scenario will identify which containers hold mixtures and if the mixtures are made of two or three materials. The unknown common materials will be taken from the following lists.
i. Solids: Anhydrous sodium acetate, yeast, vitamin C (ascorbic acid), *calcium carbonate (powdered limestone), *table salt (NaCl), *sugar (crystal), *flour, *calcium sulfate 2H2O (gypsum), *cornstarch, *baking soda, *powdered gelatin, *powdered Alka-Seltzer®, *sand (white).
ii. Non-Powdered Metals: aluminum, iron, zinc, magnesium, copper, tin.
iii. Liquids: lemon juice, rubbing alcohol (isopropyl), household ammonia (3%), water, vinegar,
hydrogen peroxide (3%).
If the metals were powdered that would not follow the rules.