Enthalpy Change

The energy contained in a material is called…

• Heat

• Enthalpy

• Internal energy

• Potential wnergy

• Kinetic energy

The energy that moves from one material to another is called

• Calories

• Work

• Enthalpy

• Electrical energy

• Mechanical energy

The transfer of energy from one state to another at constant pressure is called...

• Calories

• Work

• Enthalpy

• Potential energy

• Kinetic energy

Ferrous metal is heated from 30°C to 150°C. If the weight of iron is 2 kg and the specific heat of iron is 0.5 J g

–1°C heat required is….

• 50 kJ

• 70 kJ

• 90 kJ

• 120 kJ

• 150 kJ

The enthalpy properties are as follows, except

• heat at constant pressure

• cannot be measured other than the change

• the energy that accompanies a chemical reaction at constant pressure

• the heat contained in a material

• change in energy at constant pressure

If you want to know the reactivity of HCl on iron, you put ferrous metal into HCl solution. In this case the so-called system is….

• HCl solution

• Ferrous metal

• Water solvent

• HCl and iron

• ambient air

Which of the following processes is an endothermic process?

• the clouds are condensing

• water turns to ice

• gelatin solidifies

• Melted iron freezes

• The clouds become rain

The energy associated with the motion of molecules in the system

• Kinetic energy

• Potential energy

• Internal energy

• Energy

• Electrical energy

Which of the following is an open system, except

• Glass

• Teapot

• Thermos

• Pot

• Basin

A reaction that releases energy is called...

• Endothermic reaction

• Exothermic reaction

• Forward reaction

• Equilibrium reaction

• Reaction formation