Boron (B) has two naturally occurring isotopes: boron-10 (abundance = 19.8%,

mass = 10.013 amu) and boron-11 (abundance = 80.2%, mass = 11.009 amu).

Calculate the atomic mass of boron.

The following chemical equation is not balanced: C3H8 + O2 CO2 + H2O When this chemical equation is correctly balanced, what is the coefficient of the carbon dioxide molecule?

Are apples acidic or a base.

Methane molecules (the overwhelming majority of the molecules in natural gas) are composed of 25.1% hydrogen and 74.9% carbon, by mass. If there is a reaction between 115.1 g of carbon with 34.

What are the possible products of the reduction of sulfuric acid? Select all that apply. SO2 (g) HS3 (aq) H2S (g) SO3 (g)

A mixture initially contains A, B, and C in the following concentrations: [A] = 0.700 M, [B] = 0.850 M, and [C] = 0.300 M. The following reaction occurs and equilibrium is established: A+2B⇌C At equilibrium, [A] = 0.570 M and [C] = 0.430 M.

Under what condition is decompostion the fastest? Under what condition is it the slowest?

Which compound has the strongest hydrogen bonding between its molecules? 1. HBr 2. HF 3. HCl 4. HI

Arrange the following bonds in order of increasing polarity: O-H, C-H, F-H, H-H A) O-H B) C-H<0-H C) H-H D) C-H E) HH

How fast do p waves travel?

Calcule o calor especifico do estanho sabendo que foram necessarias 100 cal para elevar em 20ºC a temperatura de 100 g de estanho