Chemistry Unit 1 Regents Review

A mixture of crystals of salt and sugar is added to water and stirred until all solids have dissolved. Which statement best describes the resulting mixture?

• The mixture is homogeneous and can be separated by filtration.

• The mixture is homogeneous and cannot be separated by filtration.

• The mixture is heterogeneous and can be separated by filtration.

• The mixture is heterogeneous and cannot be separated by filtration.

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.

Compared to a 26-gram sample of NaCl(s) at STP, a 52-gram sample of NaCl(s) at STP has

• a different density

• a same mass

• the same chemical properties

• the same volume

Which type of matter is composed of two or more elements that are chemically combined in a fixed proportion?

• solution

• compound

• homogeneous mixture

• heterogeneous mixture

A large sample of solid calcium sulfate is crushed into smaller pieces for testing. Which two physical properties are the same for both the large sample and one of the smaller pieces?

• mass and density

• mass and volume

• solubility and density

• solubility and volume

A student measures the mass and volume of a sample of aluminum at room temperature, and calculates the density of Al to be 2.85 grams per cubic centimeter. Based on Table S in the Chemistry Reference Table, what is the percent error for the student's calculated density of Al?

• 2.7%

• 5.3%

• 5.6%

• 95%

Which statement describes H₂O(l) and H₂O₂(l)?

• Both are compounds that have the same properties.

• Both are compounds that have different properties.

• Both are mixtures that have the same properties.

• Both are mixtures that have different properties.

Which sample of matter is a mixture?

• Br₂ (l)

• K (s)

• KBr (s)

• KBr (aq)

Bronze contains 90 to 95 percent copper and 5 to 10 percent tin. Because these percentages can vary, bronze is classified as

• a compound

• an element

• a mixture

• a solution

Which statement describes the type of change and the chemical properties of the product and reactants?

• The equation represents a physical change, with the product and reactants having different chemical properties.

• The equation represents a physical change, with the product and reactants having identical chemical properties.

• The equation represents a chemical change, with the product and reactants having different chemical properties.

• The equation represents a chemical change, with the product and reactants having identical chemical properties.

Tags

NGSS.MS-PS1-2