After 42 days a 2.0 g sample of phosphorus-32 contains only 0.25 g of the isotope. What is the half-life of phosphorus-32?

Part B Write the balanced chemical equation for the neutralization reaction that occurs when an aqueous solution of hydrobromic acid (HBr) is mixed with an aqueous solution of lithium hydroxide (LiOH).

1. If you have 4.0 g of a radioactive substance left after 4 half-lives have passed, then how much did you have originally? a. 50 g b. 64 g c. 25 g d. 10 g 2. If a fusion reaction yields 4.50 x 10^9 kJ of energy, then how much mass was lost? a. 5.

Select the correct answer. An ion has a net charge of 3+. If this ion has 8 protons, how many electrons does it have? A. 3 B. un OC. 7 D. 00 E. 11

Why are many fossil remains left from the last ice age

The measure of the amount of dissolved salt in a liquid sample is called the water cycle. evaporation. salinity. a thermal exchange.

Describe the physical properties of water

Which element has the same number of valence electrons as oxygen--. a. Neon-b. Nitrogen-c. Sulfur-d. Fluorine

Approximately how many half-lives must pass for the amount of radioactivity in a substance to decrease to below 1% of its initial level?

Which piece of glassware is best suited for making accurate dilutions?

Match each equilibrium constant with the direction that the reaction is favored. question 4 options:k = 6.7 x10-4k = 325k = 1.0 x 107k = 0.0035