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IB Chemistry SL Questions

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IB Chemistry SL Topic 5 Questions 1. 2. 3. What energy changes occur when chemical bonds are formed and broken? A. Energy is absorbed when bonds are formed and when they are broken. B. Energy is released when bonds are formed and when they are broken. C. Energy is absorbed when bonds are formed and released when they are broken. D. Energy is released when bonds are formed and absorbed when they are broken. The temperature of a 2.0 g sample of aluminium increases from 25°C to 30°C. How many joules of heat energy were added? (Specific heat of Al = 0.90 J g–1K–1) A. 0.36 B. 2.3 C. 9.0 D. 11 Using the equations below: C(s) + O2(g) → CO2(g) Mn(s) + O2(g) → MnO2(s) ∆H = –390 kJ ∆H = –520 kJ what is ∆H (in kJ) for the following reaction? MnO2(s) + C(s) → Mn(s) + CO2(g) 4. A. 910 B. 130 C. –130 D. –910 Which statements about exothermic reactions are correct? I. They have negative ΔH values. II. The products have a lower enthalpy than the reactants. III. The products are more energetically stable than the reactants. A. I and II only B. I and III only C. II and III only D. I, II and III 5. 6. A sample of a metal is heated. Which of the following are needed to calculate the heat absorbed by the sample? I. The mass of the sample II. The density of the sample III. The specific heat capacity of the sample A. I and II only B. I and III only C. II and III only D. I, II and III The average bond enthalpies ...
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