Exploring the Composition of Mixtures in AP Chemistry

What are the two main categories into which everything in the universe can be classified?

• Energy and Matter

• Atoms and Molecules

• Mixtures and Solutions

• Elements and Compounds

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

• Molecule

• Formula Unit

• Atom

• Compound

How many naturally occurring elements are there approximately?

• 50

• 75

• 90

• 118

What do we call a unit of a compound that is so small it cannot be divided further and still retain the properties of that compound?

• Element

• Atom

• Molecule

• Mixture

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

• Sand and Water

• Concrete

• Kool-Aid

• Salad

What type of mixture is concrete?

• Element

• Homogeneous

• Compound

• Heterogeneous

What method can be used to determine the purity of a compound in a mixture?

• Boiling Point Analysis

• Elemental Analysis

• pH Testing

• Density Measurement

If a sample of sodium chloride is contaminated with sulfur, what is the first step in determining its purity?

• Check its density

• Test its pH

• Measure its boiling point

• Perform an elemental analysis

In the given example, what is the purity percentage of sodium chloride if the sample contains 25% sodium, 39% chlorine, and 36% sulfur?

• 90%

• 75%

• 64%

• 50%

Who is the instructor of the AP Chemistry complete course?

• Jeremy Krug

• John Doe

• Emily Davis

• Jane Smith