Can't Judge a Powder

(section: 2 / paragraph: a / sub-paragraph: i / line: 1,2)

2014-03-08 21:23 Are students allowed to bring graduated cylinders?

No, graduated cylinders are not on the list of items that students may bring.

(section: 2 / paragraph: a / sub-paragraph: v / line: 1)

2013-12-22 22:16 Are graduated beral pipettes permissable?

Yes - Beral pipettes are permitted for Can't Judge a Powder, whether graduated or not.

(section: 2 / paragraph: a / sub-paragraph: vi / line: 1)

2013-11-06 11:43 Can the 9-v conductivity meter be commercial product, or does it have to be home-made?

As long as the conductivity meter is operated by a 9 volt battery, it is allowed.

2014-01-01 15:10 Is the 9-volt Conductivity tester to be assumed as "not to exceed," or only 9-volt allowed?

The rules say that students may only bring specified items. Teams may bring only 9-volt conductivity testers, per General Rules in the manual.

(section: 2 / paragraph: c / line: 5)

2014-01-01 15:12 The rules say, "Chemical gloves are optional, but recommended." Specifically, what are "chemical gloves"

Chemical gloves are safety gloves worn when working with potential dangerous chemicals. They usually take a while to degrade, are not easily permeable, and are strong. Most are made of Neoprene, nitrile, PVC, PVA (We should not use these), and latex.

(section: 3 / line: 1)

2013-11-06 11:44 how many grams of the sample are given to the students? If they run out, can they ask for more without penalty?

It will be up to the Event Supervisors. The Event Supervisors may notify the students at the beginning of the competition if refills will be allowed or not, students may ask the Event Supervisor.  Since materials vary widely in density, there is no minimum or maximum number of grams Event Supervisors are to provide to the students.

(section: 3 / paragraph: d / line: 5)

2014-01-01 15:32 Rule 3d states not to say endothermic or exothermic, a web guide gives 5pts for: "...0.2 grams of the powder was dissolved in 3 ml of DI the temperature decreased from 23.3C to 21.8C thus inferring that dissolving the powder in water is endothermic."

When in doubt, read the Rules Manual. Students should not write inferences. They should only write observations. When answering questions, they should write the number(s) of the observation(s) that would be used to answer the question. Examples with inferences in them should not be listed. There is no place in the rules manual that says how to punish a team that writes an unneeded inference. However, if a team writes an unsupported inference and lists that inference to answer a question, it would receive a maximum of 2 points.