8.6A Modeling Elements, Compounds, Mixtures

Which of the following is an element?

• Salt (NaCl)

• Oxygen (O₂)

• Water (H₂O)

• Air (NOAr)

Which symbol represents an element?

• CO₂

• H₂O

• Na

• NaCl

Which best describes an element?

• Cannot be broken down into simpler substances

• Made of two or more substances

• Uniformly mixed together

• Combination of compounds

Tags

NGSS.MS-PS1-1

A student has a sample of copper wire. What type of matter is it?

• Compound

• Homogeneous mixture

• Element

• Heterogeneous mixture

Tags

NGSS.MS-PS1-1

Which is an example of an element in everyday life?

• Table sugar

  (C₁₂H₂₂O₁₁)

• Helium in a balloon

  (He)

• Salt water

  (NaCl + H₂O)

• Carbon dioxide

  (CO₂)

Which of the following is a compound?

• Iron (Fe)

• Oxygen (O₂)

• Carbon dioxide (CO₂)

• Aluminum (Al)

Tags

NGSS.MS-PS1-1

Which best describes a compound?

• A substance made of two or more elements chemically combined

• A substance that cannot be broken down

• Two or more elements mixed but not bonded

• A substance with only one atom type

Tags

NGSS.MS-PS1-1

Water (H₂O) is classified as—

• an element

• a compound

• a homogeneous mixture

• a heterogeneous mixture

Tags

NGSS.MS-PS1-1

Which example shows a compound?

• Table salt (NaCl)

• Gold (Au)

• Air

• Sand and salt

Tags

NGSS.MS-PS1-1

Why is carbon dioxide (CO₂) a compound?

• It contains only one type of atom (element)

• a substance made of two or more different elements chemically united

Tags

NGSS.MS-PS1-1