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

A sealed, rigid 1.0-liter cylinder contains He gas at STP. An identical sealed cylinder contains Ne gas at STP. These two cylinders contain the same number of*

(1) atoms

(2) electrons

(3) ions

(4) protons

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

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, 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 gas sample at STP has the same number of molecules as a 2.0-liter sample of Cl₂(g) at STP?*

(1) 1.0 L of NH₃(g)

(2) 2.0 L of CH₄(g)

(3) 3.0 L of CO₂(g)

(4) 4.0 L of NO(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, 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)

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

physical-behavior-of-matter, 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

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

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

physical-behavior-of-matter, 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

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.

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.

physical-behavior-of-matter, 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.*

Base your answers to questions 14 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.*

Base your answers to questions 15 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.*