Aparticular radioactive isotope has a half-life of (2.50+a) hours. if you have (24.5+b) g of the isotope at 10: 00 am, how much will you have at 7: 30pm? give your answer in grams (g)and with 3 significant figures.

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

Which fact represents evidence for the big bang theory?

Which type of precipitation would most likely form when the surface air temperature is slightly below freezing and the air temperature increases as you move upward away from the ground?