A process where substances change into different ones by breaking and forming bonds between their tiny parts. You start with some things, they change, and you end up with new things. This happens because the atoms in these substances rearrange themselves. Sometimes, energy is released or absorbed during this process.

• chemical reaction

• reactant

• product

• chemical properties

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The substance that starts the process of breaking chemical bonds or forming new bonds. It's one of the starting materials that participate in the transformation into different substances.

• chemical reaction

• reactant

• product

• chemical properties

Tags

NGSS.MS-PS1-5

The new substance created after substances breakdown or form new bonds. It's what you end up with after the starting substances have undergone changes.  This new substance can be a compound (a completely different substance made of two or more things) or an element.

• chemical reaction

• reactant

• product

• chemical properties

Tags

NGSS.MS-PS1-2

This describes how a substance behaves when it interacts with other substances or undergoes a chemical change. They show how a material can transform into new substances, like whether it rusts, burns, or reacts with other things.  

Examples:  Flammability, toxicity, corrosiveness, conductivity, etc.

How the substance behaves.

• chemical reaction

• reactant

• product

• chemical properties

Tags

NGSS.MS-PS1-2

Characteristics of a substance that can be observed or measured without changing what the substance is. These characteristics include things like color, shape, size, texture, and how something feels or smells.

• physical properties

• exothermic reaction

• endothermic reaction

• catalyst

A chemical reaction that gives off heat or light. It releases energy outward, making things around it warmer.

• physical properties

• exothermic reaction

• endothermic reaction

• catalyst

Tags

NGSS.MS-PS1-4

A chemical reaction that absorbs heat from its surroundings. It feels cold when it takes in warmth from the air around it.

• physical properties

• exothermic reaction

• endothermic reaction

• catalyst

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A substance that increases the rate of a chemical reaction.

• physical properties

• exothermic reaction

• endothermic reaction

• catalyst

Tags

NGSS.HS-PS1-5

A substance that decreases the rate of a chemical reaction.

• inhibitor

• law of conservation of mass

• endothermic reaction

• catalyst

Tags

NGSS.HS-PS1-5

The principle that states the total mass of substances before a chemical reaction equals the total mass after the reaction; mass is conserved.

• inhibitor

• law of conservation of mass

• endothermic reaction

• catalyst

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5