Ample and h is the half-life, in days, of the substance. a sample contains 18% of its original amount of radon-222. the half-life of radon-222 is about 3.8 days. which is the best estimate for the age of the sample?

1. Which out of the following elements has the lowest electronegativity: Lithium, Beryllium, Magnesium, Sodium 2. Which out of the following elements has the least metallic character: Lithium, Beryllium, Magnesium, Sodium 3.

Which chamber collects blood from the lungs that is rich in oxygen?

Which are functions of the skin? check all that apply

On earth, the weight of an object changes. TrueFalse

Salt and water are mixed together in a bowl. The salt dissolves. The bowl of salty water is left out on the table.

If a sealed syringe that contains some gas in heated in which direction will the syringe plunger move

Use the drop‑down menus to label the statements as either true of false. Dichloromethane is flammable. true false Methanol is flammable. Concentrated sulfuric acid is corrosive. 10% sodium carbonate solution must be used in the fume hood.

What is the process all rocks are continuously in during which that can change into other types of rocks

Collagen is made of fibers and is found in tendons and cartilage. Collagen contributes to meat toughness and is, therefore, an example of which type of protein?

1. Why does CH30 evaporate faster than water?