Chemical Reactions Chapter 1 Test

FIRST Name

LAST Name

Science core

• Core 1
• Core 2
• Core 3

The letters and numbers of the atoms that make up a substance is known as a _____________________.

• scientific number
• chemical formula
• periodic table
• chemical reaction

Repeating atom groups can form separate units called _____________________.

• extended structures
• chemical formulas
• elements
• molecules

A substance can be made up of one type of atom or a specific group of atoms that ____________ over and over.

• repeats
• combines
• arranges
• reacts

Out of the following substances, circle the one that is NOT a molecule.

• NaCl (sodium chloride)
• H2O (water)
• Fe2 O3 (iron oxide)
• Au (gold)

Which scientist arranged elements in an organized way that we now call the Periodic Table?

• John Dalton
• Albert Einstein
• Dmitri Mendeleev
• Thomas Edison

This diagram shows the repeating groups of atoms that make up two samples. Both samples are red powdery solids at room temperature. Will the other properties of the two samples be the same or different?

• The properties will be different because there are more repeating groups of atoms in Sample 1.
• The properties will be the same because both samples are powdery solids at room temperature.
• The properties will be the same because both samples are red at room temperature.
• The properties will be same because the repeating groups of atoms that make up the two samples are the same.

Which one of the following is an example of a pure element?

• water
• oxygen
• sodium chloride
• carbon dioxide