QAM #1 Review

Which formula represents a homogeneous mixture?

• NaCl (aq)

• NaCl (l)

Which statement describes a mixture of sand and water at room temperature?

• It is heterogeneous, and its components are in the same phase.

• It is heterogeneous, and its components are in different phases.

• It is homogeneous, and its components are in the same phase.

• It is homogeneous, and its components are in different phases.

The image is best described as

• 2 elements forming a mixture with new properties

• 2 elements forming a compound with new properties

• 2 elements forming a mixture with the same properties

• 2 elements forming a compound with the same properties

Tags

NGSS.HS-PS1-3

During a chemical change,

• Substances are chemically combined to form a new substance with different properties

• Substances are chemically combined to form a new substance with the same properties

• Substances are physically combined to form a new substance with different properties

• Substances are physically combined to form a new substance with the same properties

Which process can be used to separate a mixture of two liquids having different boiling points?

• Deposition

• Distillation

• Filtration

• Chromatography

Which change of phase is exothermic?

• solid to liquid

• gas to liquid

• solid to gas

• liquid to gas

Which phase change results in an increase in entropy?

Which phase change represents deposition?

Compared to the energy of an electron in the second shell of an atom of sulfur, the energy of an electron in the

• first shell is lower

• first shell is the same

• third shell is lower

• third shell is the same

What is the number of neutrons in the following atom?

• 18

• 16

• 10

• 8