Classification of Matter

Two boxes in the image represent an element. Circle those two boxes.

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In our life, we work almost exclusively with compounds. But a few objects are elements, such as iron. The biggest reason for this is elements tend to combine to form compounds. If the name is on the Periodic Table in one single box, it is an element. For example, Aluminum (Al) is an element while Table Salt (NaCl) is a compound. Scarlett and Ava were discussing this in their chemistry class. Which of the following is an element?

H₂0 (water), Calcium (Ca), or CO₂ (Carbon Dioxide)

(a)  

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One box in the image represents a compound. Circle that box.

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Hannah is conducting an experiment in her chemistry class. She has a sample of Silver (Ag). Is this sample an Element, Compound, or Mixture?

• Element

• Compound

• Mixture

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Element, Compound or Mixture?

Nora is conducting an experiment in her chemistry class. She has a sample of Oxygen (O). What type of substance is it?

• Element

• Compound

• Mixture

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Element, Compound or Mixture?

Benjamin is making a saltwater solution for his science experiment. What is saltwater?

• Element

• Compound

• Mixture

Daniel, Ethan, and Henry are in a science lab. Which jar contains a compound?

• 1st jar

• 2nd jar

• 3rd jar

• 4th jar

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Aiden and Jackson are discussing the elements they learned about in science class. Select the two elements from the list below.

• Oxygen

• Carbon Dioxide

• Nitrogen

• Water

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Olivia and Benjamin are in a science class. Select the two compounds they discussed.

• Oxygen

• Carbon Dioxide

• Nitrogen

• Water

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Grace is analyzing a chemical compound in her lab. How many different elements make-up the compound shown?

• 2

• 3

• 6

• 7

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