Regents Chemistry Test Preparation Practice Classification Of Matter

Which sample of matter is classified as a substance?*

(1) air

(2) ammonia

(3) milk

(4) seawater

Which sample of matter represents a mixture?*

(1) aqueous ammonia

(2) gaseous ethane

(3) liquid mercury

(4) solid iodine

Which sample can be classified as a substance?*

(1) air

(2) argon

(3) soil

(4) seawater

All matter can be classified as*

(1) an element

(2) a compound

(3) a mixture or an element

(4) a mixture or a substance

Given the diagram representing a classification of matter:

physical-behavior-of-matter, classification-of-matter fig: chem82022-exam_g2.png

Which types of matter are represented by X and Z in the diagram?*

(1) X is mixture, and Z is substance.

(2) X is substance, and Z is mixture.

(3) X is element, and Z is compound.

(4) X is compound, and Z is element.

A substance is classified as either an element or a*

(1) compound

(2) solution

(3) heterogeneous mixture

(4) homogeneous mixture

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

(1) a different density

(2) a different gram-formula mass

(3) the same chemical properties

(4) the same volume

Given four particle models:

physical-behavior-of-matter, classification-of-matter fig: chem12015-exam_g8.png

Which two models can be classified as elements?*

(1) I and II

(2) I and IV

(3) II and III

(4) II and IV

Compared to a 15-gram sample of Cu(s) at 25°C, a 25-gram sample of Cu(s) at 25°C has*

(1) the same density and the same chemical properties

(2) the same density and different chemical properties

(3) a different density and the same chemical properties

(4) a different density and different chemical properties

At STP, which physical property of aluminum always remains the same from sample to sample?*

(1) mass

(2) density

(3) length

(4) volume

Given the particle diagram:

physical-behavior-of-matter, classification-of-matter fig: chem62016-exam_g10.png

Which type of matter is represented by the particle diagram?*

(1) an element

(2) a compound

(3) a homogeneous mixture

(4) a heterogeneous mixture

Which two particle diagrams each represent a sample of one substance?

physical-behavior-of-matter, classification-of-matter fig: chem82017-exam_g5.png *

(1) I and II

(2) I and III

(3) II and III

(4) II and IV

Base your answers to questions 13 on the information below.

Nitrogen gas and oxygen gas make up about 99% of Earth’s atmosphere. Other atmospheric gases include argon, carbon dioxide, methane, ozone, hydrogen, etc.

The amount of carbon dioxide in the atmosphere can vary. Data for the concentration of CO₂(g) from 1960 to 2000 are shown in the table below.

periodic-table, identification-of-element fig: chem12013-exam_g19.png

Explain why the atmosphere is classified as a mixture.*

Base your answers to questions 14 on the information below and on your knowledge of chemistry.

In the late 19th century, the Hall-Herroult process was invented as an inexpensive way to produce aluminum. In this process, Al₂O₃(ℓ) extracted from bauxite is dissolved in Na₃AlF₆(ℓ) in a graphite-lined tank, as shown in the diagram below. The products are carbon dioxide and molten aluminum metal.

physical-behavior-of-matter, classification-of-matter fig: chem62013-exam_g18.png

Compare the chemical properties of a 300.-kilogram sample of Al₂O₃(ℓ) with the chemical properties of a 600.-kilogram sample of Al₂O₃(ℓ).*

Base your answers to questions 15 on the information below.

Iron has been used for thousands of years. In the air, iron corrodes. One reaction for the corrosion of iron is represented by the balanced equation below.

Equation 1: 4Fe(s) + 3O₂(g) → 2Fe₂O₃(s)

In the presence of water, iron corrodes more quickly. This corrosion is represented by the unbalanced equation below.

Equation 2: Fe(s) + O₂(g) + H₂O(ℓ) → Fe(OH)₂(s)

Identify one substance in the passage that can not be broken down by a chemical change.*