123s of Chemistry Review

Front

What elements make up the equation Cl₂ + 2NaBr → 2NaCl + Br₂?

Back

Chlorine, Sodium, Bromine

Front

What type of change is cutting down a tree?

Back

Physical change

Front

What is the smallest particle of a compound held together by a chemical bond?

Back

Molecule

Front

What type of change is burning a log?

Back

Chemical change

Front

What is the formula for ETHYLENE?

Back

C₂H₄

Front

How many atoms of carbon and hydrogen are in ethylene (C₂H₄)?

Back

2 atoms of carbon and 4 atoms of hydrogen

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a molecule?

Back

The smallest particle of a compound that retains its chemical properties.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.