Unit 2 Study Guide
o Avogadro’s number can be defined as the number of particles in…
o 3 moles of calcium have a mass of…
o A 54g sample of aluminum contains…
o Calculate the mass in kilograms of 9.3 moles of O2.
o A sample of lead contains 3.1x1023 atoms. Calculate the mass of the sample
o In 1911 Rutherford conducted an experiment where he bombarded gold foil with
o The results of his experiment lead him to believe…
o Who was the first person to suggest the idea of an atom?
o How did Rutherford’s gold foil experiment lead to the discovery of the proton?
o Explain in full sentences, why Dalton’s atomic theory was incorrect
o Most of the mass within the atom is contained in the
o Isotopes are atoms with different;
o Which part of the atom contains the most mass? Explain your answer fully.
o The number of protons in one atom of an element determines the atom’s ______, and the number of electrons determines the ______of the element. The ______of an element is the total number of protons and neutrons in the ______of an atom.
Particle / Charge / Location / MassSpecies / Protons / Neutrons / Electrons
Se
29Si
He
O2-
o Elements in the periodic table are arranged in order of increasing…
o A family of elements that contains the most unreactive non- metals is …
o Elements that lie along the zig- zag line are the …
o Write the electronic configurations for the following atoms/ ions
Mg
S2-
o Write the shortened electronic configuration for the following atoms
Sr
As
o What is the empirical formula for a compound that is 26.56% K, 35.41% Cr, and 38.03% oxygen?
o What is the formula of magnesium chlorate
o An 240g sample of a radioisotope decayed to 30g after 24 days. What was the total mass of the original sample after 8 days?
o What is the symbol for an beta particle?
o Calculate the percentage by mass of zinc in zinc chloride.
o Three isotopes of argon occur in nature, Ar- 36 (35.97amu, 0.445%), Ar- 38 (37.96amu, 0.089%), and Ar- 40 (39.969amu, 99.466%). Calculate the average atomic mass of argon.
o Name the group of elements that have 7 valence electrons.
o The empirical formula of a compound is CH. The experimental molar mass is 26.04g/mol. Determine the molecular formula of the compound.
o Calculate the percentage by mass of oxygen in sulfuric acid, H2SO4
o Calculate the percentage by mass of oxygen in laughing gas, N2O
o Write the nuclear equation for the alpha decay of neptunium- 237
o Write the nuclear equation for the beta decay of americium- 243
o Write an equation showing the reaction between N- 15 and an alpha particle to produce a neutron and a new product.