Regents Chemistry Test Preparation Practice Number Of Paritcles And Valumes Of Gases

The table below shows the volume and temperature of four different gas samples at 100. kPa.

number-of-paritcles-and-valumes-of-gases fig: chem12020-exam_g6.png

Which two gas samples contain equal numbers of atoms?*

(1) helium and neon

(2) helium and argon

(3) neon and argon

(4) neon and krypton

The volumes of four samples of gaseous compounds at 298 K and 101.3 kPa are shown in the table below.

number-of-paritcles-and-valumes-of-gases fig: chem82019-exam_g7.png

Which two samples contain the same number of molecules?*

(1) 1 and 2

(2) 1 and 3

(3) 2 and 3

(4) 2 and 4

At STP, which gas sample has the same number of molecules as 2.0 liters of CH₄(g) at STP?*

(1) 1.0 liter of C₂H₆(g)

(2) 2.0 liters of O₂(g)

(3) 5.0 liters of N₂(g)

(4) 6.0 liters of CO₂(g)

Which sample at STP has the same number of atoms as 18 liters of Ne(g) at STP?*

(1) 18 moles of Ar(g)

(2) 18 liters of Ar(g)

(3) 18 grams of H₂O(g)

(4) 18 milliliters of H₂O(g)

The table below shows data for the temperature, pressure, and volume of four gas samples.

number-of-paritcles-and-valumes-of-gases fig: chem62018-exam_g18.png

Which two gas samples contain the same number of molecules?*

(1) I and II

(2) I and III

(3) II and III

(4) II and IV

Which sample of gas at STP has the same number of molecules as 6 liters of Cl₂(g) at STP?*

(1) 3 liters of O₂(g)

(2) 6 liters of N₂(g)

(3) 3 moles of O₂(g)

(4) 6 moles of N₂(g)

At STP, a 12.0-liter sample of CH₄(g) has the same total number of molecules as*

(1) 6.0 L of H₂(g) at STP

(2) 12.0 L of CO₂(g) at STP

(3) 18.0 L of HCl(g) at STP

(4) 24.0 L of O₂(g) at STP

At STP, which gaseous sample has the same number of molecules as 3.0 liters of N₂(g)?*

(1) 6.0 L of F₂(g)

(2) 4.5 L of N₂(g)

(3) 3.0 L of H₂(g)

(4) 1.5 L of Cl₂(g)

At STP, which sample contains the same number of molecules as 3.0 liters of H₂(g)?*

(1) 1.5 L of NH₃(g)

(2) 2.0 L of CO₂(g)

(3) 3.0 L of CH₄(g)

(4) 6.0 L of N₂(g)

At STP, a 1-liter sample of Ne(g) and a 1-liter sample of Kr(g) have the same*

(1) mass

(2) density

(3) number of atoms

(4) number of electrons

Base your answers to questions 11 on the information below and on your knowledge of chemistry.

At 23°C, 85.0 grams of NaNO₃(s) are dissolved in 100. grams of H₂O(ℓ).

Convert the temperature of the NaNO₃(s) to kelvins.*

Convert the melting point of mercury to degrees Celsius.*

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

The equation below represents a reaction between propene and hydrogen bromide.

chemical-reactions-and-equations fig: chem82016-exam_g13.png

Cyclopropane, an isomer of propene, has a boiling point of –33ºC at standard pressure and is represented by the formula below.

chemical-reactions-and-equations fig: chem82016-exam_g14.png

Convert the boiling point of cyclopropane at standard pressure to kelvins.*

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

Some properties of the element sodium are listed below.

is a soft, silver-colored metal
melts at a temperature of 371 K
oxidizes easily in the presence of air
forms compounds with nonmetallic elements in nature
forms sodium chloride in the presence of chlorine gas

Convert the melting point of sodium to degrees Celsius.*

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

Cylinder A has a movable piston and contains hydrogen gas. An identical cylinder, B, contains methane gas. The diagram below represents these cylinders and the conditions of pressure, volume, and temperature of the gas in each cylinder.

number-of-paritcles-and-valumes-of-gases fig: chem62013-exam_g14.png

Compare the total number of gas molecules in cylinder A to the total number of gas molecules in cylinder B.*