Vocabulary: Chemical Reactions

The smallest unit of matter that retains the chemical identity of the element.

• Atom
• answer

A change in matter that produces a new substance.

• Chemical change
• answer

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Represents the type and number of atoms present in a particular substance.

• Chemical formula
• answer

Tags

NGSS.MS-PS1-1

A representation of a chemical reaction using chemical symbols, numbers, and a symbol →.

• Chemical equation
• answer

Tags

NGSS.MS-PS1-5

The explanation of how the particles of matter (atoms and molecules) are recombined during a chemical change, resulting in the formation of new substances.

• Chemical reaction
• answer

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.

• Coefficient
• answer

Tags

NGSS.MS-PS1-5

A pure substance made by chemically combining two or more elements; represented by a chemical formula.

• Compound
• answer

Tags

NGSS.MS-PS1-1

A pure substance composed of the same type of atom throughout.

• Element
• answer

Refers to the simplest unit of a chemical compound that can exist; formed when two or more atoms combine chemically.

• Molecule
• answer

Tags

NGSS.MS-PS1-1

An organized table of all the chemical elements in order of increasing atomic number.

• Periodic Table of elements
• answer