Oquizy

Which statement is true?

Combustion is endothermic Energy is absorbed overall Energy is released; exothermic reaction Products have higher energy than reactants

A student heats 50.0 g of water from 20 °C to 30 °C. Given c = 4.18 J/g°C for water.
What is the energy absorbed? What is the energy absorbed?

209 J 2090 J 4180 J 50 J

Which is most reactive based on energy released?

Fe Mg Same Zn

What type of reaction does this diagram represent?

Combustion only Endothermic Exothermic Reversible

Hydrogen gas reacts with chlorine gas to form hydrogen chloride according to the following equation: H₂ + Cl₂ → 2HCl. The bond energies of the relevant bonds are:
- H–H = 436 kJ/mol
- Cl–Cl = 243 kJ/mol
- H–Cl = 431 kJ/mol.
What is the overall enthalpy change?

+179 kJ/mol +272 kJ/mol –183 kJ/mol –430 kJ/mol

Which statement is correct?

Bond breaking is endothermic Bond breaking is exothermic Bond making is endothermic Bond making requires energy

Quiz: Chemistry - Chemical Energetics