1. complete the chart below by placing a dot and the percentage next to each dot for the 2-7 half-lives. hint: the dot and percentage for the zero half-life and the first half-life have been completed for you as an example. predicted radioactive decay of an isotope 100 90 s 80 co 70 60 aso 2 40 100 % 50% 20 10 3 5 6 number of half-lives

Use the drop-down menus to answer each question. which runner finished the 100 m race in the least amount of time? which runner stopped running for a few seconds during the race? at what distance did anastasia overtake chloe in the race?

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring