Elements, Compounds, and Mixtures

Match the term with the correct definition:​

• A pure substance

• Compound

• 2 or more substances not evenly blended

• Heterogeneous Mixture

• 2 or more substances blended evenly

• Homogeneous Mixture

• 2 substances are chemical combined

• Element

1 A substance made up of two or more chemically combined elements is —

• an element
• mixture
• compound
• solution

Which of the following is a mixture?

• oxygen

• gold

• sand

• water

NaHCO₃ is an example of —

• an abbreviation
• a compound
• a mixture
• an element

• pure element

• heterogeneous mixture

• homogeneous mixture

• pure compound

Answer explanation

Because the atoms are all the same type of element, this is a diatomic element NOT a compound. Compounds require two different types of elements to combine.

The illustration below shows the process of two different substances being combined. Which process does the illustration show?

• two pure substances physically combined to form a mixture

• two pure substances chemically combined to form a different pure substance

• a mixture separated into the components that were originally combined

• a solution formed by dissolving a solid in a liquid

Brass is a metal that is bright red and gold. It is formed by combining, not chemically, two elements, zinc and copper. Based on the information, how would brass be classified?

• an element

• compound

• mixture

• suspension

Which of the following is a way in which elements and compounds are similar?

• Elements and compounds are pure substances.
• Elements and compounds are both made up of different kinds of atoms.
• Elements and compounds can both be broken down by physical means.
• Elements and compounds are listed on the periodic table.

The table lists the chemical formulas or symbols of a few common substances. Which two substances are compounds?

• aluminum and iron

• iron and sodium chloride

• carbon dioxide and aluminum

• sodium chloride and carbon dioxide

This table has two columns of different kinds of matter. Which of the following is the best label for the second column?

• Elements
• Compounds
• Mixtures
• Atoms

Tags

Science 6.5A