The half-life of a certain element is 100 days. How many half-lives will it be before only one-eighth of this element remains?

What major events cause islands to form in the pacific ocean

What two factors determine the state of a substance

Which describes fat? A: a carbohydrate that produces energy B: a nucleic acid that directs cell function C: a lipid that stores energy D: a protein that speeds up a chemical reaction

Zinc sulfide reacts with oxygen according to the reaction: 2ZnS (s) 3O2 (g) →2ZnO (s) 2SO2 (g) A reaction mixture initially contains 3.0 mol ZnS and 5.2 mol O2.

How much water must be removed by steam distillation to recover this natural product from 3.0 g of a spice that contains 10% of the desired substance?

A chemical spill gets into the soil and effects the plants within a forested ecosystem. explain why the top predators would be most affected by this

If the heat released during condensation goes only to warming the iron block, what is the final temperature (in ∘C∘C) of the iron block? (Assume a constant enthalpy of vaporization for water of 44.0 kJ/molkJ/mol.)

Which of the following is not a disaccharide? A) sucrose B) maltose C) lactose D) amylose E) all of the above are disaccarides

The process by which a semipermeable membrane allows water molecules, small molecules, and ions to pass through while retaining large particles

Ice melting, water boiling, lighting a match, grape juice freezing. Which statement describes evidence of a chemical reaction