When a piece of steel wool is burned it gains mass. which explanation is consistent with the law of conservation of mass? a) matter was created during the chemical reaction. b) heat changed into matter. c) a chemical change did not take place. d) matter from the air combined with the steel wool.

The biosphere of the earth is made up of what compound? organic or inorganic?

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i

⁉️how many kj of energy would be needed to convert 150. g of ammonia to vapor at its boiling point? ⁉️(ammonia’s heat of vaporization is 1.38 kj/g