Moles V – Gas Laws
Question 1 Calculate the volume occupied by one mole of a gas at 25 oC and 100 kPa. Question 2 Calculate the pressure of a gas given that…
Moles IV – Concentrations
Question 1 Calculate the number of moles of H2SO4 in 50 cm3 of a 0.50 moldm-3 solution. Question 2 Calculate the number of moles of FeSO4 in 25 cm3…
Moles III – Empirical Formulae
Question 1 What is the empirical formula of a compound containing 60.0% sulfur and 40.0% oxygen by mass? Question 2 A compound is found to contain 23.3% magnesium, 30.7% sulfur,…
Moles II – Stoichiometry
Question 1 Given the chemical equation Na(s) + H2O(ℓ) → NaOH(aq) + H2(g) a) Balance the equation. b) How many molecules of H2are produced when 332 atoms of Na react? Question 2…
Moles I – Introduction
Question 1 How many atoms are present in 4.55 mol of Fe? How many atoms are present in 0.0665 mol of K? How many molecules are present in 2.509 mol…
Covid Assignment 1: Ionisation Energies
Explain why helium’s first ionisation energy is much higher than hydrogen’s. Explain why lithium has lower ionisation energy than helium even though lithium has 1 proton more. Why does the…
Questions for Revision During Covid-19
Atomic Structure Question 1 Write the electronic configuration for: C, N3-, Fe2+, Cu, Cu+, I and Pb. Question 2. Put the following atoms/ions in order of decreasing size. Explain your…