Which process results in a chemical change?

A) Tearing tin foil

B) melting an iron bar

C) crushing an aluminum can

D) burning magnesium ribbon

In what ways are microwave and ultraviolet radiation the same? In what ways are they different?

Why is refraction so important in eyeglasses.

How many moles of oxygen are in a 7.68 L container at 355 K and exerting a pressure of 8.57 atm on the walls of the container?

What is the molality of a solution made by combining 5.0 g of CaCl2 with 500.0 g of water?

Consider the following equilibrium reaction having gaseous reactants and products. 4HCl + O2 ⇌ 2H2O + Cl2 Which of the following would result from increasing the volume of oxygen?

What is the molarity of a solution containing 5.0 moles of kcl in 2.0 l of solution?

Compare the electron configurations of hydrogen, lithium, and sodium. Why do you think these elements are grouped in the same family?

What is the theoretical yield of silver chloride?

Calculate the cell potential for the galvanic cell in which the reaction Fe (s) + Au 3 + (aq) - ⇀ ↽ - Fe 3 + (aq) + Au (s) occurs at 25 ∘ C, given that [ Fe 3 + ] = 0.00150 M and [ Au 3 + ] = 0.797 M.

Magnesium is lighter than other structural metals, so it is increasingly important in the design of more efficient vehicles.