A 3.[04.03] Which describes how chemical changes are different from physical changes? (1 poir
Chemical changes can be measured, but physical changes cannot.
Chemical changes involhy the formation of a new substance.
Chemical changes release energy, but physical changes absorb energy.
Chemical changes cannot be caused by oxygen.
4. [04.06]

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

Gas cloud 1 is likely to form a star. gas cloud 2 is not. based on this information, match the given conditions with each cloud

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.