Consider the reaction

B (s) + 32O2 (g) →B2O3 (s), ΔH = - 1270kJ

What will ΔH be for the reaction if it is reversed?

Express your answer with appropriate units.

Which of the following has the greatest mass, in grams?1) 1 atom of gold (Au) 2) 1.0 mol mercury (Hg) atoms 3) 2.0 mole of chlorine (Cl) atoms 4) 25 atoms of mercury (Hg)

What information could a student determine from only the chemical formula of a protein

1. This is a physical combination of one substance dissolved in another. 2. This is a property of solid metals. Capable of being shaped or formed, by hammering or pressure. 3. This is a mixture that has different properties throughout.

What is a good high school level science experiment?

What do you think about our current forms of recycling and why?

What happens to iron oxide during decomposition

What is the symbol for the second most common element in the universe? a. H b. C c. Fe d. He?

Which class of organic compound would neutralize a carboxylic acid? O aldehyde amine alkyl halide ether

Calculate the molarity of the solution. 29 g of NaCl (g. f. w. = 58.5 g/mol) in 0.030 liters. 0.015 M 17 M 67 M

How can scientists study the composition of distant stars?