Regents Chemistry Test Preparation Practice Differentiation Of Types Of Substances

Chemical properties can be used to*

(1) determine the temperature of a substance

(2) determine the density of a substance

(3) differentiate between two compounds

(4) differentiate between two neutrons

Compared to the physical and chemical proper- ties of the compound NO₂, the compound N₂O has*

(1) different physical properties and different chemical properties

(2) different physical properties and the same chemical properties

(3) the same physical properties and different chemical properties

(4) the same physical properties and the same chemical properties

Carbon monoxide and carbon dioxide have*

(1) the same chemical properties and the same physical properties

(2) the same chemical properties and different physical properties

(3) different chemical properties and the same physical properties

(4) different chemical properties and different physical properties

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

(1) Both are compounds that have the same properties.

(2) Both are compounds that have different properties.

(3) Both are mixtures that have the same properties.

(4) Both are mixtures that have different properties.

A sample of a substance has these characteristics: (cid:129) melting point of 984 K (cid:129) hard, brittle solid at room temperature (cid:129) poor conductor of heat and electricity as a solid (cid:129) good conductor of electricity as a liquid or in

an aqueous solution

This sample is classified as*

(1) a metallic element

(2) a radioactive element

(3) a molecular compound

(4) an ionic compound

Which formulas represent one ionic compound and one molecular compound?*

(1) N₂ and SO₂

(2) Cl₂ and H₂S

(3) BaCl₂ and N₂O₄

(4) NaOH and BaSO₄

Compared to the chemical and physical properties of the compound CO, the compound CO₂ has*

(1) the same chemical properties and the same physical properties

(2) the same chemical properties and different physical properties

(3) different chemical properties and the same physical properties

(4) different chemical properties and different physical properties

A 2.5 L sample of SO₂(g) at STP and a 2.5 L sample of CO₂(g) at STP can be differentiated by comparing their*

(1) masses

(2) phases

(3) temperatures

(4) volumes

Which property can be used to differentiate between a 50.-gram sample of solid potassium nitrate at STP and a 50.-gram sample of solid silver chloride at STP?

mL*

(1) mass

(2) temperature

(3) phase

(4) solubility

Ice, H₂O(s), is classified as*

(1) an ionic compound

(2) a molecular compound

(3) a homogeneous mixture

(4) a heterogeneous mixture

Which elements can react to produce a molecular compound?*

(1) calcium and chlorine

(2) hydrogen and sulfur

(3) lithium and fluorine

(4) magnesium and oxygen

A solid sample of a compound and a liquid sample of the same compound are each tested for electrical conductivity. Which test conclusion indicates that the compound is ionic?*

(1) Both the solid and the liquid are good conductors.

(2) Both the solid and the liquid are poor conductors.

(3) The solid is a good conductor, and the liquid is a poor conductor.

(4) The solid is a poor conductor, and the liquid is a good conductor.

Base your answers to questions 13 on the information below and on your knowledge of chemistry.

A laboratory technician is given the table below and a sample of one of the three substances listed in the table. The technician makes an aqueous solution with a portion of the sample. When a conductivity tester is lowered into the solution, the lightbulb on the tester glows brightly. Another portion of the sample is placed in a heat-resistant container that is placed in an oven at 450.°C. The sample melts.

chemical-bonding, differentiation-of-types-of-substances fig: chem12016-exam_g9.png

Identify the substance given to the technician.*

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

Some compounds of silver are listed with their chemical formulas in the table below.

periodic-table, elements-in-the-periodic-table, chemical-bonding, bonding-tendency-of-elements, chemical-bonding, differentiation-of-types-of-substances fig: chem62018-exam_g21.png

Explain, in terms of element classification, why silver chloride is an ionic compound.*

A student drew the Lewis electron-dot diagram below to represent sodium chloride.

chemical-bonding, electron-dot-diagrams-(lewis-structures), atomic-concepts, valence-electrons, chemical-bonding, electron-dot-diagrams-(lewis-structures), chemical-bonding, bonding-tendency-of-elements, chemical-bonding, chemical-bonds, chemical-bonding, differentiation-of-types-of-substances fig: chem82015-exam_g6.png

Explain why this diagram is not an accurate representation for the bonding in NaCl.*