1.18 Unit 1 Test – Chemistry – Junior – Flashcards

Why does opening the air valve of a tire at a constant temperature decrease the pressure? Question options: The number of molecules decreases. The temperature decreases. The atmospheric pressure decreases. The volume decreases.

A student increases the temperature of a 200 cm^3 balloon from 60°C to 180°C. What will the new volume of the balloon be? Question options: 100 cm 3 600 cm 3 236 cm 3 272 cm 3

In a reaction between vinegar and antacid tablets, the antacid is the limiting reagent. At constant pressure and temperature, three tablets produce 600 cm3 of gas. What volume will six tablets produce? Question options: 300 cm 3 800 cm 3 1,200 cm 3 600 cm 3

You breathe in 12.0 L of pure oxygen at 298 K and 1,000 kPa to fill your lungs. How many moles of oxygen did you take in? Question options: 1.21 moles 2.42 moles 0.05 moles 4.84 moles

Consider a gas at STP in a container of 22.4 L. If you apply the ideal gas law, what is the approximate value of n? Question options: 0.5 8.31 1 224

A protein denatures when you cook it at 60°C. What is that temperature on the Kelvin scale? Question options: 333 K 325 K 213 K 373 K

The average speeds of gas molecules in cylinders A, B, C, and D are 0.01 m/s, 0.005 m/s, 0.1 m/s, and 0.5 m/s, respectively. Which cylinder contains gas that is closest to absolute zero? Question options: C A D B

Of these four liquids, which is the most viscous? Question options: http://www.agoraeagles.org/ hot motor oil water at room temperature honey at room temperature ethyl alcohol at room temperature

Which solid conducts electricity most efficiently? Question options: sugar gold graphite sodium chloride

How many moles of a gas sample are in a 10.0 L container at 373 K and 203 kPa? Question options: 0.33 moles 0.66 moles 1.11 moles 3.05 moles

A 6.0 L container holds a sample of hydrogen gas at 150 kPa. If the pressure increases to 2 atm and the temperature remains constant, what will the volume be? Question options: 0.22 L 0.44 L 2.26 L 4.50 L

Trimix 10/50 is a gas mixture that contains 10% oxygen and 50% helium, and the rest is nitrogen. If a tank of Trimix 10/50 has a total pressure of 2.07 × 104 kPa, then what is the partial pressure of oxygen? Question options: 2.07 × 10^3 kPa 8.3 × 10^3 kPa 2.07 × 10^4 kPa 1.04 × 10^4 kPa

At which point on a phase diagram do you have a solid, a liquid, and a gas simultaneously? Question options: triple point critical point boiling point melting point

A reaction requires 22.4 L of gas at STP. You have 30.5 L of gas at 101.5 kPa and 373 K. Which of the following statements is true? Question options: You will have enough gas for the reaction. You will have excess gas for the reaction. Given this information, you cannot tell if you have enough gas for the reaction. You do not have enough gas for the reaction.

You collect hydrogen gas over water at 323 K. The partial pressure of hydrogen is 122.4. and the total pressure is 123.5 kPa. What is the pressure of the water vapor? Question options: 0.91 kPa 1.10 kPa 12.3 kPa 257 kPa

Which of the following statements explains why you will not find liquid carbon dioxide on the earth's surface? (Use the phase diagram here.) Question Options: The surface temperature and pressure are above the critical point. The atmospheric pressure is below the triple point. The surface pressure is above the triple point. The surface temperature of 15°C is too warm for liquid carbon dioxide at any pressure.

The partial pressure of oxygen at 310 K in one lung (3.0 L) is 60.0 kPa. How many moles of oxygen are in that lung? Question options: 0.05 mol 0.025 mol 0.07 mol 1.00 mol

The pressure of air inside a sealed, rigid, metal can at 100°C is 125 kPa, and the atmospheric pressure is 101.5 kPa. You quickly cool the can to 0°C. Which of the following statements is true? Question options: The pressure inside the can will decrease, and the can will be crushed by the atmospheric pressure. The pressure inside will decrease, but the can will not be crushed by the atmospheric pressure. The pressure inside the can will increase, and the can will push out. The pressure inside the can stays the same.

Gas mixtures behave the same as individual gases do. Question options: True False

Individual gases behave independently of a mixture. Question options: True False

Individual gases contribute to the pressure of a mixture. Question options: True False

The term "diffusion" describes the movement of gas molecules from an area of low concentration to an area of high concentration. Question options: True False

Vapor pressure exists only when a liquid substance boils. Question options: True False

Both surface tension and viscosity result from a high degree of intermolecular forces among molecules in a liquid sample. Question options: True False

Each phase of matter can be described according to the relative amount of intermolecular forces (IF) holding the molecules together compared to the kinetic energy (KE) of those molecules. Match each of the following phases of matter to the proper description of its intermolecular forces and kinetic energy of molecules. Question Options: ____ IF >> KE ____ IF << KE ____ IF >= KE 1. solid 2. liquid 3. gas

Consider a standard phase diagram. Identify where on the phase diagram the following properties of a material can be determined: ____ sublimation curve ____ fusion curve ____ vaporization curve Question Options: 1. temperature and pressure at which a substance melts and/or freezes 2. temperature and pressure at which a substance boils and/or condenses 3. temperature and pressure at which a substance sublimes

Temperature is a measure of molecular speed. Rank the following temperatures in order of INCREASING molecular speed (start with the slowest and end with the fastest): Question Options: 130 K 100 C 50 C 253 K -50 C

The kinetic energy of molecules in a substance varies according to the phase of that substance. For each of the following phase changes listed, indicate whether energy was gained or lost: a) freezing liquid water into solid ice b) subliming solid ice into gaseous water vapor c) boiling liquid water into gaseous water d) condensing gaseous water into liquid water e) melting solid ice into liquid water