conservation Of Energy

The Law of Conservation of Energy states:

• Energy can created or destroyed but not transformed

• Energy cannot be created or destroyed, it can only transformed

• Energy can't be created, destroyed or transformed

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-3

NGSS.HS-PS3-4

Which of the following is an example of energy transformation according to the law of conservation of energy?

• A car engine converting chemical energy from fuel into kinetic energy.

• A battery losing all its energy without any output.

• A light bulb creating energy from nothing.

• A wind turbine destroying wind energy.

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DOK Level 2: Skill/Concept

In a closed system, if the potential energy decreases, what happens to the kinetic energy according to the law of conservation of energy?

• The kinetic energy remains the same.

• The kinetic energy decreases.

• The kinetic energy increases.

• The kinetic energy is destroyed.

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DOK Level 2: Skill/Concept

Which of the following statements is true according to the law of conservation of energy?

• The total amount of energy in a closed system can change.

• Energy can be created in a closed system.

• The total amount of energy in a closed system remains constant.

• Energy can be destroyed in a closed system.

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DOK Level 1: Recall

Measure of the amount of matter 

• mass
• volume
• weight
• density

Smallest unit of an element

• compound
• atom
• molecule
• product

Substance made up of chemically combined elements

• atom
• element
• electron
• compound

Tags

NGSS.MS-PS1-1

Substances that form as the result of a chemical reaction

• products
• reactants
• coefficients
• subscripts

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which  of the following is a balanced equation?

• Na   +   Cl₂   -->  NaCl
• H₂  +  O₂  --> H₂O
• Ca   +   Br  -->  CaBr₂
• Na   +  F  -->  NaF

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical equation tells us 

• the reactants and the products.
• the elements that make up the reactants and the products.
• the number of atoms that make up the reactants and the products.
• All of the above.