The scientific method has several characteristics and "observation" is one of them, which of the following describes an "observation"? an observation is obtained by an experiment. ooo none of them is correct. an observation is based on theory. an observation is information that is gathered with senses.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

rosa was looking for patterns to predict the products of chemical reactions. she recorded three similar decomposition reactions in the table.she should record 2licl + 3o2.

in the last row of the table. it is the thermal decomposition of chlorate lithium, hence, she should record these products as: lithium chloride ( 2licl ) and oxygen ( 3o2 )   2 > 2 licl + 3o2.