Chemistry Test Review

What defines a mixture?

• cannot be broken down into simpler substances

• created through a chemical reaction

• can be broken down into its basic substances through physical means

• described by a chemical formula

When atoms are joined together, they form ______.

• protons

• molecules

• nuclei

• electrons

Tags

NGSS.MS-PS1-1

Which of the following models represents carbon dioxide (CO2)?

• W

• X

• Y

Tags

NGSS.MS-PS1-1

The rows of the periodic table are called ________.

• periods

• groups

• families

• lines

Which of the following statements best describes a molecule?

• Molecules must have at least three atoms.

• Molecules must be made of only one atom.

• Molecules can have any number of atoms, from one to thousands.

• Molecules can have two to thousands of atoms.

Tags

NGSS.MS-PS1-1

Which of the following is a property of metals?

• Metals have a shiny luster.

• Metals are good conductors.

• Metals have high density.

• all of these

Along each row of the periodic table, what happens to the atomic mass?

• atomic mass increases from left to right.

• atomic mass is the same for all elements in the row.

• atomic mass changes in no set pattern.

• atomic mass decreases from left to right.

What does the diagram suggest about the element silver?

• The atoms of silver are a gas.

• The atoms of silver are different sizes.

• The atoms of silver are all alike.

• The atoms of silver are each unique.

Tags

NGSS.MS-PS1-1

Select the correct diagram. Which of the following diagrams shows a pure substance that is composed of only individual atoms and not molecules?

• Ar

• CO₂

• H₂

• H₂O

Select the correct answer from each drop-down menu. Vertical columns on the periodic table are called ________.

• A. groups

• B. periods

• C. metals

• D. nonmetals