For a quiz, ! : ) how did early chemists determine which substances were elements? a. they knew what substances were mixtures. b. they knew how many protons were in the atoms. c. they knew which substances could not be broken down by chemical means. d. they knew how many electrons were in the outer shell of every atom

Monkeys and bats have similar bone structure in their forelimbs. however, monkeys have longer forelimbs to use for climbing and swinging in trees. bats have shorter forelimbs to use for flight. which term best describes how monkey and bat forelimbs are related to each other? a. homologous b. embryonic c. analogous d. vestigial

Start an single atom tab. observe the decay of polonium-211. after each decay, press the reset nucleus button to watch the process again. write a description of alpha decay for po-211

What is the overall order of reaction for rate = k[no2]2 ? second order 3/2 order third order zero order none of the listed answers are correct