Chemistry Quiz Review

To make ammonia, you need to complete the reaction below: N2 + 3 H2 → 2 NH3. If you react 956.2 L of H2, how many grams of NH3 will you create? Round your answer to the appropriate number of significant figures.

• 405.0 grams NH3

• 484.7 grams NH3

• 214.0 grams NH3

• 170.5 grams NH3

In lab, you diluted some hydrochloric acid, resulting in a hydrogen concentration of 9.6 x 10^-5 M. What would the resulting pOH be?

• pOH = 4.02

• pOH = 5.69

• pOH = 9.98

• pOH = 12.53

In the science closet, there is a container of 200.0 mL of a 5.00 M solution of NaCl. If you dilute the solution by adding enough water to make the new volume 500.0 mL, what is the new molarity?

• 0.5 M

• 2.0 M

• 8.0 M

• 12.5 M

Tags

NGSS.HS-PS1-7

During the combustion of magnesium in air, magnesium oxide is produced. As Perla ran her reaction, she collected 9.24 grams of MgO. She had calculated that she should have produced 14.2 grams. What was her percent yield? Round your answer to the nearest whole number.

• 15%

• 35%

• 65%

• 154%

As you go across the periodic table from left to right, the atomic radius ______ because there are ______.

• increases, more energy levels

• decreases, more energy levels

• decreases, less energy levels

• increases, less energy levels

Tags

NGSS.HS-PS1-1

As you go down the periodic table from top to bottom, the atomic radius ______ because there are ______.

• increases, less protons, creating a weaker pull on the electron shell

• decreases, more protons, creating a greater pull on the electron shell

• increases, more energy levels

• decreases, less energy levels

In a lab, you're studying the behavior of gases to ensure it meets the criteria of the Kinetic Molecular Theory. Currently, you have 275.3 grams of SF6 (molar mass of SF6 = 146.054 g/mol) is held at 207.82 kPa and 906 K. What is the current volume of the container?

• 47.7 L

• 56.0 L

• 59.5 L

• 68.3 L

The temperature of a sample of Xe is changed, causing a change in volume from 4970 mL to 4486 mL. If the starting temperature was 221 K, what is the final temperature in Celsius?

• -73.5 C

• 126.5 C

• 199 C

• 472 C

All of the following are a part of the postulates of kinetic molecular theory EXCEPT -

• Gas particles speed up as the temperature increases

• Gases are in constant random motion

• Gases exert force as they collide

• The volume of gas particles are all combined to determine how much space they take up

Initially, you have a container of gas with a volume of 0.435 L at 590. mmHg and 308 K. If the container is expanded to 2400. mL and the temperature is dropped to 273 K, what would be the new pressure in millimeters of mercury?

• 76.8 mmHg

• 94.8 mmHg

• 121 mmHg

• 1530 mmHg