Match the type of emitted radiation to the minimum amount of shielding required to stop it: A. Alpha Particle ___ Several lead bricks
B. Beta Particle ___ paper
C. Gamma ray ___ thin piece of lead

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Which of the following is most likely true about water in chemical systems? a) water dissolves nonpolar ionic compounds. b) water dissociates ionic compounds. c) water dissociates covalent molecules. d) water dissolves nonpolar covalent substances.