Why do solids have different densities

What is the chemical formula for helium gas?

Which of the elements form + 1ion

The ___ number is a postive or negative number assigned to an atom according to a set of abituary rules

What materials preserve soft tissues in fossils

What is the correct name for SO3?

How does protein substance in an animal hide or skin be prevented from bacterial infection during the process of tanning? * a. By soaking in water b. By deliming using an acid c. By brine curing d. By scudding with dull knife

Nonpolar materials have separated positive and negative areas. True False

Large rocks being blasted to make way for the construction of a tunnel is an example of what type of weathering? A. Chemical B. Mechanical C. Deposition D. Erosion

A criminalist uses a fluorescent chemical called rhodamine, cyanoacrylate fumes, and a uv light source to see a fingerprint on a gun. Which type of evidence is he detecting? Gross evidence latent evidence direct evidence trace evidence

Which of the following energy changes occurs as a ball bounces