Hukum Kekekalan Energi

The law of conservation of energy states that...

• Energy can be created and destroyed

• Energy always increases over time

• Energy cannot be created but can be destroyed

• Energy cannot be created or destroyed, but can change form

• Energy only exists in potential form

Which of the following examples is an application of the law of conservation of energy?

• A stone falling from a table

• Water evaporating from a pot

• A rolling ball that then stops

• All of the above answers are correct

• A plant absorbs sunlight energy for photosynthesis

When a light bulb is lit, electrical energy is converted into...

• Chemical energy

• Mechanical energy

• Heat and light energy

• Potential energy

• A combination of several forms of energy, including sound

In an ecosystem, sunlight energy is converted into chemical energy through the process of...

• Photosynthesis

• Decomposition

• Transpiration

• Respiration

• Evaporation

The correct statement regarding the law of conservation of energy is...

• Total energy in the universe continues to decrease

• Energy can be lost in the form of heat

• Energy can transfer from one object to another, but the total amount remains constant

• Potential energy is always greater than kinetic energy

• The law of conservation of energy only applies to closed systems

The correct statement regarding systems and environments is...

• Systems are always larger than the environment

• The boundary between systems and environments is always clear

• Systems and environments influence each other

• The environment never changes

• Systems are always in equilibrium

In a chemical reaction, the system is...

• The substances that react

• The container where the reaction takes place

• The energy produced or absorbed

• The surrounding environmental temperature

• The catalyst used

A system that does not allow the exchange of energy or mass with its environment is called...

• Isolated system

• Closed system

• Adiabatic system

• Open system

• Isothermal system

A system that allows the exchange of energy and mass with its environment is called...

• Isolated system

• Closed system

• Adiabatic system

• Open system

• Isothermal system

An example of a closed system in everyday life is...

• Boiling water in an open pot

• Ice melting in a glass

• A battery used in a flashlight

• Air in an expanding balloon

• Water evaporating from the ocean surface