B) Heptane, C7H16 is a hydrocarbon found in petrol. The equation for the combustion of heptane is:

C7H16 (l) + 11O2(g) → 7 CO2 (g) + 8 H2O (l)

H = -4817 kJ mol-1

Draw a simple energy diagram to show the combustion of heptane show clearly how the figure of - 4817 fits onto your diagram.​

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Why is soap used to remove grease? a. its nonpolar end dissolves the grease. b. it makes the water bond with the grease. c. it chemically bonds with the grease. d. its polar end dissolves the grease.correct answer for apex - a, its nonpolar end dissolves the grease.

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat

Which element is the least metallic between cadmium, silver, zinc, or iron?