ESAT (Engineering and Science Admissions Test) · Chemistry

Energetics

6 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 6 questions

$25.0 cm^{3}$ of $1.0 mol/dm^{3}$ HCl is mixed with $25.0 cm^{3}$ of $1.0 mol/dm^{3}$ NaOH. The temperature rises by $6. 7^{\circ} C$ . Assuming $1.0 g/cm^{3}$ and…
Given $C + O_{2} \to CO_{2}$ with $Δ H = - 394 kJ/mol$ and $CO + \frac{1}{2} O_{2} \to CO_{2}$ with $Δ H = - 283 kJ/mol$ , what is $Δ H$ for…
Which statement about an exothermic reaction is correct?
Use the bond energies H-H $= 436$ , Cl-Cl $= 243$ and H-Cl $= 432$ (all in kJ/mol) to find $Δ H$ for $H_{2} + Cl_{2} \to 2 HCl$ .
$0.46 g$ of ethanol ( $M_{r} = 46$ ) is burned and heats $100 g$ of water by $6. 0^{\circ} C$ . Taking $c = 4.2 J/g^{\circ} C$ , what is the enthalpy of combustion found by this expe…
Ammonium nitrate is dissolved in water and the temperature of the solution falls. What does this show?

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