General Chemistry Answers

Consider the Mg2+ , Cl- , K+ and Se2- ions. Discuss the variation in the ionic size

Inkquill and InkBarn are two competing ink manufacturing companies. Inkquill claims that 

its water soluble black ink is richer in colour than InkBarn’s water soluble black ink. You 

have been hired as an independent consultant to determine whether Inkquill’s claim is true.

Plan and design an experiment to determine whether Inkquill’s claim is true.

Plan and designed. Hypothesis, aim,apparatus, methods and more

On the basis of periodic trends, choose the larger atom in each pair. Explain your choices.

(a) C or Ge (b) N or Al

An element is composed of 

Liquid hydrogen peroxide, an oxidizing agent in many rocketfuel mixtures, releases oxygen gas on decomposition:

2H2O2(l) → 2H2O (l) + O2(g) ∆Hrxn = - 196. 1 kJ

Calculate ∆Hrxn for

Ca(s) + 1⁄2 O2(g) + Co2 (g) → CaCO3(s) given the following set of reactions:

Ca(s) + 1⁄2 O2(g) →CaO(s) ∆H = -635.1 kJ CaCO3(s) →CaO(s) + CO2(g) ∆H = 178.3 kJ

Write the balanced overall equation for the followingprocess (equation 3) and calculate ∆HoveralI.

(1) N2 (g) + O2(g) → 2NO(g) (2) 2NO(g) + O2(g) → 2NO2(g) (3)

∆H = 180.6 kJ ∆H = - 114.2 kJ

∆H overall=?