The total mass of a chemical reaction always

changes
remains constant
increases
decreases

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a. the mitochondria b. the nucleus c. the vacuoles d. the endoplasmic reticulum

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?