4.2

What is the process that turns one substance into a different substance?

• Electrolysis

• Evaporation

• Boiling

• Condensation

What is the balanced chemical equation for the reaction of magnesium with oxygen to form magnesium oxide?

• Mg + O₂ → MgO

• Mg + O₂ → 2MgO

• 2Mg + O₂ → 2MgO

• 2Mg + O₂ → MgO

What is the energy potential of a chemical reaction called?

• Activation energy

• Enthalpy

• Exothermic energy

• Endothermic energy

What is the name of the law that states the total mass and energy of the system plus the surroundings is constant?

• Law of Conservation of Energy

• Law of Conservation of Mass

• Law of Thermodynamics

• Law of Mass Conservation

What is the energy necessary to break bonds in the reactants so a chemical reaction can occur called?

• Chemical energy

• Activation energy

• Kinetic energy

• Potential energy

What is the opposite of an endothermic reaction?

• Exothermic reaction

• Thermodynamic reaction

• Endergonic reaction

• Exergonic reaction

What is the process that rearranges the atoms in any substance(s) to produce one or more different substances?

• Physical change

• Chemical change

• Nuclear change

• Phase change

What is the name of the law that states that, in any chemical reaction, the total mass remains the same?

• Law of Mass Conservation

• Law of Energy Conservation

• Law of Mass Preservation

• Law of Matter Conservation

What is the energy needed to start a reaction and break chemical bonds in the reactants called?

• Activation energy

• Kinetic energy

• Potential energy

• Chemical energy

What is the name of the energy potential of a chemical reaction at standard temperature and pressure?

• Endothermy

• Exergy

• Entropy

• Enthalpy