Exploring Mixtures, Compounds, and Elements

Which of the following is a pure substance?

• Air

• Water

• Salad

• Soil

What is the smallest unit of an element that retains the properties of that element?

• Molecule

• Atom

• Compound

• Mixture

Which of the following is a compound?

• Oxygen

• Carbon dioxide

• Gold

• Helium

Tags

NGSS.MS-PS1-1

Which of the following is a mixture?

• Salt

• Sugar

• Air

• Water

Which of the following statements is true about elements?

• Elements can be broken down into simpler substances by chemical means.

• Elements are made up of two or more types of atoms.

• Elements are pure substances consisting of only one type of atom.

• Elements are always found in a gaseous state.

Which of the following is an example of a homogeneous mixture?

• Sand and water

• Oil and water

• Saltwater

• Salad

What is the chemical formula for water?

Tags

NGSS.MS-PS1-1

Which of the following is a characteristic of compounds?

• They can be separated by physical means.

• They have a fixed composition.

• They consist of only one type of atom.

• They are always in a solid state.

Which of the following is an example of a heterogeneous mixture?

• Vinegar

• Milk

• Salad dressing

• Saltwater

Which of the following is not a property of elements?

• They are made of atoms.

• They can be broken down into simpler substances.

• They have unique chemical properties.

• They are listed in the periodic table.