Substances, Mixtures and Solutions

Which of the following pure substances is commonly used as a sweetener?

• Gold Metal

• Copper Wire

• Sugar

• Salt

What is the chemical formula for water?

• A) H2O

• B) O2

• C) NaOH

• D) CO2

Which of the following is a molecule made of two hydrogen atoms and one oxygen atom?

• A) O2

• B) NaOH

• C) H2O

• D) CO2

Which of the following best describes a mixture?

• A pure substance

• A combination of different molecules

• A single element

• A single compound

Which of the following statements is true about mixtures?

• Mixtures are always homogeneous

• Mixtures are always heterogeneous

• Mixtures can be either homogeneous or heterogeneous

• Mixtures cannot be separated into their components

What is a mixture?

• A single type of molecule in one place

• A combination of different molecules in one place

• A combination of atoms in one place

• A single type of atom in one place

What is the result of combining three different pure substances?

• A new element

• A mixture

• A single pure substance

• A compound

Which of the following can be considered a pure substance?

• Saltwater

• Air

• Oxygen (O2)

• Soil

Which type of mixture has an uneven distribution of molecules?

• Homogenous

• Heterogenous

• Solid

• Liquid

What does the term "homogenous" imply about the mixture?

• The mixture is the same throughout.

• The mixture is different throughout.

• The mixture is random.