Exam 3 - Changes and Bond Energy

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, involving the breaking and forming of bonds.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What does endothermic mean?

Back

Endothermic refers to a process or reaction that absorbs heat from its surroundings.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Front

What does exothermic mean?

Back

Exothermic refers to a process or reaction that releases heat to its surroundings.

Tags

NGSS.HS-PS1-4

Front

What is bond energy?

Back

Bond energy is the amount of energy required to break one mole of a bond in a substance.

Tags

NGSS.HS-PS1-4

Front

How can you identify a chemical change?

Back

Indicators of a chemical change include color change, gas production, formation of a precipitate, and temperature change.

Tags

NGSS.MS-PS1-2

Front

What is the significance of heat in chemical reactions?

Back

Heat can indicate whether a reaction is endothermic or exothermic, affecting the energy balance of the reaction.

Tags

NGSS.MS-PS3-4

Front

What is the difference between a reactant and a product?

Back

Reactants are substances that undergo a chemical change, while products are the new substances formed as a result of the reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Tags

NGSS.MS-PS1-5

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change, as it changes state from solid to liquid without altering its chemical composition.

Tags

NGSS.MS-PS1-4