Regents Chemistry Test Preparation Practice Chemical Bonding

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

Base your answers to questions 10 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 11 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.*

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

Rubidium and iodine have different chemical and physical properties. Some of these properties are shown in the table below.

periodic-table, identification-of-element, chemical-bonding, chemical-bonds, chemical-bonding, bonding-tendency-of-elements fig: chem12018-exam_g14.png

State the chemical property of iodine listed in this table.*

Base your answers to questions 14 on the information below.

During a fireworks display, salts are heated to very high temperatures. Ions in the salts absorb energy and become excited. Spectacular colors are produced as energy is emitted from the ions in the form of light.

The color of the emitted light is characteristic of the metal ion in each salt. For example, the lithium ion in lithium carbonate, Li₂CO₃, produces a deep-red color. The strontium ion in strontium carbonate, SrCO₃, produces a bright-red color. Similarly, calcium chloride is used for orange light, sodium chloride for yellow light, and barium chloride for green light.

Identify the two types of chemical bonds found in the salt used to produce a deep-red color.*

Base your answers to questions 15 on the information below and on your knowledge of chemistry.

The Lewis electron-dot diagrams for three substances are shown below.

chemical-bonding, electron-dot-diagrams-(lewis-structures), atomic-concepts, valence-electrons, chemical-bonding, electron-dot-diagrams-(lewis-structures), chemical-bonding, chemical-bonds, chemical-bonding, bonding-tendency-of-elements fig: chem12016-exam_g7.png

Describe, in terms of valence electrons, how the chemical bonds form in the substance represented in diagram 1.*