Which process results in a chemical change?

(1) tearing tin foil

(2) melting an iron bar

(3) crushing an aluminum can

(4) burning magnesium ribbon

Which of the following states of matter occurs at the highest temperature? A. Gas B. Liquid C. Plasma D. Solid

What is the mass of a 1.68-l sample of a liquid that has a density of 0.921g/ml?

When an atom loses one or more electrons, this atom becomes a (1) positive ion with a radius smaller than the radius of this atom (2) positive ion with a radius larger than the radius of this atom (3) negative ion with a radius smaller than the

Determine the oxidation number (oxidation state) of each element in CH 4. C : H : Determine the oxidation number (oxidation state) of each element in SO 2. S : O : Determine the oxidation number (oxidation state) of each element in BF 3. B : F :

What chromosomes move to the middle of the spindle during what phase

Are energy levels and orbitals the same thing?

Heating devices can be made by passing an electric current through a conductor of: high resistance low resistance high conductivity low conductivity

What is the element 3O2 name

Why sulphur used for food preservation?

How would a solution that is labeled 5.0 molar be similar to one labeled 5.0 molal?