Law of Conservation of Energy with Balancing Equation

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃

• 4Fe + 3O₂ -> 2Fe₂O₃

• 2 Fe + 3O₂ -> Fe₂O₆

• 4 Fe + O₆ -> 2Fe₂O₃

• None of the options are correctly balanced.

Tags

NGSS.MS-PS1-5

Which of the following equations correctly represents the Law of Conservation of Energy?

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

NGSS.HS-PS3-3

In a closed system, if the potential energy decreases, what happens to the kinetic energy according to the Law of Conservation of Energy?

• It increases by the same amount.

• It decreases by the same amount.

• It remains constant.

• It becomes zero.

Which of the following is an example of energy transformation that obeys the Law of Conservation of Energy?

• A battery powering a flashlight.

• A car engine losing energy to friction.

• A pendulum coming to a stop.

• A light bulb burning out.

Tags

NGSS.HS-PS3-4

What is the balanced chemical equation for the combustion of methane?

• @@ ext{CH}_4 + 2 ext{O}_2 ightarrow ext{CO}_2 + 2 ext{H}_2 ext{O}@@

• @@ ext{CH}_4 + ext{O}_2 ightarrow ext{CO}_2 + ext{H}_2 ext{O}@@

• @@2 ext{CH}_4 + 3 ext{O}_2 ightarrow 2 ext{CO}_2 + 4 ext{H}_2 ext{O}@@

• @@ ext{CH}_4 + 3 ext{O}_2 ightarrow 2 ext{CO}_2 + 2 ext{H}_2 ext{O}@@

Tags

NGSS.HS-PS1-7

Which statement best describes the Law of Conservation of Energy?

• Energy cannot be created or destroyed, only transformed.

• Energy can be created but not destroyed.

• Energy can be destroyed but not created.

• Energy is always conserved in open systems.

Tags

NGSS.HS-PS3-3

In a chemical reaction, how is the Law of Conservation of Energy demonstrated?

• The total energy of reactants equals the total energy of products.

• The energy of reactants is greater than the energy of products.

• The energy of reactants is less than the energy of products.

• Energy is lost to the surroundings.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

NGSS.HS-PS3-2

What happens to the total energy in an isolated system according to the Law of Conservation of Energy?

• It remains constant.

• It increases.

• It decreases.

• It fluctuates.

Tags

NGSS.HS-PS3-4

Which of the following is a real-world application of the Law of Conservation of Energy?

• Hydroelectric power generation.

• Burning fossil fuels.

• Nuclear waste disposal.

• Deforestation.

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

How does the Law of Conservation of Energy apply to a roller coaster at the top of a hill?

• Potential energy is at maximum, kinetic energy is at minimum.

• Kinetic energy is at maximum, potential energy is at minimum.

• Both potential and kinetic energy are at maximum.

• Both potential and kinetic energy are at minimum.