Unit 9: Chemistry & Properties of Matter

Mg(OH)₂ is a compound. How many different elements are found in this compound?

• 1

• 2

• 3

Tags

NGSS.MS-PS1-1

Since sodium chloride is classified as a compound, a sample of it contains

• atoms that are gases, liquids, and solids.

• more than one kind of atom.

• matter that cannot be reduced to atoms.

• a solution of atoms and molecules.

Tags

NGSS.MS-PS1-1

An element is identified by

• its number of protons.

• the atomic mass.

• the type of charge.

• its number of isotopes.

Which best describes water?

• a compound

• an element

• a heterogeneous mixture

• a homogeneous mixture

Tags

NGSS.MS-PS1-1

Which is a homogeneous mixture?

• pizza

• sugar water

• concrete

• woven fabric

A student is testing a solid material to determine whether it is a pure substance or a mixture. Which observation would MOST likely indicate that the material is a mixture?

• The material has crystals of two different colors.

• The material does not dissolve completely in water.

• The material does not melt when it is heated over a burner.

• The material reacts with an acid solution to form bubbles of gas.

Which elements are most likely to react in the same manner in a chemical reaction?

• elements in the same group

• elements in the same period

• elements with similar atomic masses

Which property of sodium (Na) can be determined based on its location on the periodic table?

• It is a solid metal at room temperature.

• It is a liquid metal at room temperature.

• It is a solid nonmetal at room temperature.

Which statement best explains how the periodic table is organized?

• increasing atomic number from left to right

• increasing number of neutrons from left to right

• decreasing number of electrons from left to right

• decreasing atomic mass number from left to right

Where on the periodic table is a metal element most likely found?

• middle

• bottom

• left side

• right side