12b-1 distribution fee account maintenance fee revenue-sharing fee shareholder service fee 25 percent broker fee charged against the mutual fund for servicing the account arrowRight $20 broker fee charged against the mutual fund arrowRight management company pays brokers 0.1 percent fee for marketing the fund arrowRight payment to companies that investors go through to buy mutual funds arrowRight

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error