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Why does the mass of a substance remain the same after a chemical reaction?

List the two type of transporst that the cell in orde to transport molecules acroos the membrane

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive