Chemical Reactions MS-PS1-2

Grade 7 - NGSS - CA

The process where substances change into different substances through the breaking of chemical bonds

Chemical reaction

The process where substances change into different substances through the breaking of chemical bonds is called a chemical reaction. A chemical reaction is when substances mix and make new things by changing the way their tiny parts are connected.

A heat-absorbing chemical reaction, like ice melting

Endothermic reaction

A heat-absorbing chemical reaction, like ice melting. Endothermic reaction. An endothermic reaction is a process that takes in heat from its surroundings, causing the surroundings to become cooler.

States that mass cannot be created or destroyed in a chemical reaction

Law of conservation of mass

States that mass cannot be created or destroyed in a chemical reaction. Law of conservation of mass. In simple terms, this means that the total weight of stuff stays the same before and after a chemical change.

A change in size, shape, or state but not in identity

Physical change

A change in size, shape, or state but not in identity. Physical change. A physical change is when something changes how it looks or feels without becoming something new.

A solid formed when two solutions react

Precipitate

A solid formed when two solutions react. Precipitate. A precipitate is a solid that forms when two liquids mix and create a chemical reaction.

A new substance formed by a chemical reaction

Product

A new substance formed by a chemical reaction. Product. A product is the new material created when substances react chemically.

A substance that is changed in a chemical reaction

Reactant

A substance that is changed in a chemical reaction. Reactant. A reactant is a starting material that undergoes change during a chemical reaction.