Conservation of Energy and Matter

Question 1

What principle states that the total mass in a closed system remains constant during a reaction?

Answer 1

Conservation of matter

In any closed system, the amount of matter does not change, although it can transform from one form to another.For example, in chemical reactions, the mass of the chemical components after the reaction is equal to the mass of the components before the reaction.

Question 2

In a closed system, how does the total amount of energy change during physical and chemical processes?

Answer 2

Total energy remains constant

While energy may transform from one form to another (such as from chemical energy to thermal energy), the total amount of energy in a closed system does not change according to the law of conservation of energy.

Question 3

What type of energy is related to the motion of an object?

Answer 3

Kinetic energy

The higher the speed of the object, the greater its kinetic energy.

Question 4

What type of energy is realted by the movement of electrons in a conductor?

Answer 4

Electrical energy

Electrical energy is the result of the flow of electric charge through a conductor, commonly transformed into many other forms of energy, such as light energy, mechanical energy or thermal energy.

Question 5

In a battery-powered flashlight, what type of energy starts inside the battery, and what type of energy does it change into to make the flashlight work?

Answer 5

It starts as chemical energy and changes into electrical energy

In a battery, chemical reactions generate electrons that flow through a circuit, providing electrical energy, which flows through the wires and powers the flashlight.