Chemical Reactions grade 8

In a ___________change, a substance changes into a different substance.

• Physical
• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

You know that a chemical reaction has occurred if

• there is a precipitate (new solid)

• there is a color change.

• there is a temperature change.

• All of these answers are evidence.

Tags

NGSS.MS-PS1-2

1. How is a chemical change different from a physical change?

• there is no difference

• a physical change creates a new substance

• a chemical change creates a new substance

A chemical change is different than a physical change because in a chemical change

• chemicals are used

• molecules do not physically touch

• a new substance is formed and in a physical no new substance is formed

• the change can be seen but in a physical change it cannot

Tags

NGSS.MS-PS1-2

A solid that is deposited from a solution

• Solid

• Liquid

• Product

• Precipitate

A substance produced during a chemical reaction

• Product

• Reactant

• Properties

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A substance that takes part in and undergoes change during a reaction

• Product

• Molecule

• Reactant

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical reaction or process that absorbs heat from the surroundings

• Endothermic

• Exothermic

A chemical reaction or process that releases heat.

• Endothermic

• Exothermic

In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O
• MgO
• Mg and MgO
• O and MgO

Tags

NGSS.MS-PS1-2