1. A student uses a mass balance that is precise to the nearest decigram to measure 225.4 grams of fresh soil. The student then uses a digital scale that is precise to the nearest
milligram to measure 1.422 grams of topsoil. What is the total mass of soil, in grams, that the
student has measured? Record your answer to the appropriate number of significant digits.

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.

Each pair of clay balls represents to planetesimals if each plane test molluscum pound of the same material and is separated by the same distance which pair experiences the greatest gravitational attraction

Joan writes four numbers on the board in standard form, and then she writes their scientific notation