Thorium-236 has a half life of 10.0 minutes. If I have 250 grams of Thorium-236 , how many half lives will have taken place after 50.0 minutes?

Which is a characteristic of mixtures?

Compared with the freezing-point depression of a 0.01 m c6h12o6 solution, the freezing-point depression of a 0.01 m nacl solution is

What is conserved in the reaction shown below? h2(g) + cl2 (g) --> 2hcl(g)a. mass onlyb. mass and moles onlyc. mass, moles, and molecules onlyd. mass, moles, molecules, and volume