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

A brass rod 100 mm long and 5 mm in diameter extends horizontally from a casting at 200°e. the rod is in an air environment with t∞ = 20°c and h = 30 w/m2 ∙ k. what is the temperature of the rod 25, 50, and 100 mm from the casting?

Which of the following best describes the particles in a liquid? A. far apart and easily compressible B. far apart and almost incompressible C. close together and easily compressible D. close together and almost incompressible

Describe a way that people might be able to solve each envioronmental problem listed below. coal mining can harm habitats and cause pollution.

How many moles of LiF would be required to produce a 2.5 M solution with a volume of 1.5L

Which gas would have the slowest rate of diffusion, assuming that all gases are at the same temperature? krypton (atomic mass 83.8 amu) argon (atomic mass 39.95 amu) xenon (atomic mass 131.3 amu) radon (atomic mass 222 amu)

What is the concentration when 0.065 moles of NaNO3 are dissolved in enough water to make 150.0 mL of solution?

What are the reactants and products of cellular respiration and photosynthesis?

Which situation would probably NOT result in the formation of new species? A) The introduction of a predatory fish that only eats the largest native bass in a Georgia lake.

How many electrons are present in outermost shell of argon atom

Why is there a difference between sodium and potassium in the reactivity with water