Characteristics of Chemical Reactions STEMscopes

Front

What are the products of the combustion of coal?

Back

Carbon dioxide (CO2) and water (H2O) are produced when coal burns in the presence of oxygen.

Tags

NGSS.MS-PS1-5

Front

What is a precipitate in a chemical reaction?

Back

A precipitate is a solid that forms when one liquid is poured into another, indicating a chemical reaction has occurred.

Tags

NGSS.MS-PS1-2

Front

How can you determine if a chemical equation is balanced?

Back

A chemical equation is balanced when the number of atoms of each element is the same on both sides of the equation.

Tags

NGSS.MS-PS1-5

Front

What is the definition of a chemical reaction?

Back

A chemical reaction is a change in matter that produces one or more new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What evidence indicates that a chemical reaction has occurred?

Back

The production of a new substance is the best evidence that a chemical reaction has occurred.

Tags

NGSS.MS-PS1-2

Front

What is the role of oxygen in combustion reactions?

Back

Oxygen acts as a reactant that combines with a fuel (like coal) to produce energy, carbon dioxide, and water.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

Tags

NGSS.MS-PS1-4

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; the total mass of reactants equals the total mass of products.

Tags

NGSS.MS-PS1-5

Front

What are reactants in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change to form products.

Tags

NGSS.MS-PS1-2

Front

What is an example of a chemical reaction?

Back

An example of a chemical reaction is the rusting of iron, where iron reacts with oxygen to form iron oxide (rust).

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5