What is the half life of a radioisotope of a 50g sample becomes a 25g after 18 days?

A person whose skin is coated with a toxic substance gives his/her contaminated clothing to another individual. This likely will result in what is called:A. RiskB. Cross-contaminationC. IngestionD. Reckless endangerment

N2 is the form of nitrogen that animals use.

The step that usually comes last in solving numeric problems is _. A) Calculate, B) Measure, C) Evaluate, or D) Analyze

What occurs when Cr^3 + ions are reduced to Cr^2 + ions? a) electrons are lost and the oxidation number of chromium increases b) electrons are lost and the oxidation number of chromium decreases c) electrons are gained and the oxidation number of

Why do polar molecules have a greater tendency to remain a liquid or a solid at room temperature?

The envelope of air that surrounds the earth is called

What is the chemical formula for potassium permanganate?

Is it always possible to identify something as an element compound pure substance or mixture

Why would someone weigh less on Pluto?

HNO3 + H2O > H3O (aq) + NO3 - (aq)