Explain why a sewing needle can float on the surface of water in a glass

How do scientists use radioactivity to determine the age of a rock?

What is a cation and where can you find it on the periodic table?

Which of these are made up of matter? Check all that apply. parts of outer space where there is no air or atoms salt dissolved in water air in the lower levels of the Earth's atmosphere leather made from cow hides metal after if has been molded

Which materials has magnetic domains and can be made into a magnet? (A) Plastic (B) An iron nail (C) An aluminum can (D) A glass bottle

What determines a trait of an organism?

Move deep below the ocean's surface

The Ka of an acid is 1.3 x 10^-7. Based on the Ka and its relationship with Kw, what is the value of Kb? Use KaKb=Kw 1.3 x 10^-21 7.7 x 10^-15 1.3 x 10^-14 7.7 x 10^-8

A covalent bond is best described as Question 1 options: the sharing of electrons between atoms. the transfer of electrons. a bond between a metal and a nonmetal. a bond between a metal and a polyatomic ion.

From the list below, choose which groups are part of the periodic table

Gypsum is a mineral that is used in the construction industry to make drywall (sheetrock). The chemical formula for this hydrated compound is CaS04 • 2H20. A hydrated compound contains water molecules within its crystalline structure.