Mid-Term Test Review 2015…

Semester 2 These are typical questions that would

be good examples for the test …

Gas Laws Unit

• Which of the following are the highest pressure? Show work…

• 124 kPa• 900 mm Hg• 1.18 atmospheres

Gas Laws Unit

• 3.5 moles of gas occupy a volume of 20 L at 400 kPa. What is the temperature of the gas in degrees Celsius?

Gas Laws Unit

• A container of helium is sealed at 22.0 °C and 1.40 atmosphere of pressure. What pressure would be exerted by the helium if the container were heated to 220.0 °C? (and container remained sealed)

Gas Laws Unit

• A gas balloon has a volume of 106.0 liters when the temperature is 45.0 °C and the pressure is 740.0 mm of mercury.

• What will its volume be at 20.0 °C and 780 .0 mm of mercury pressure?

Gas Laws Unit

• Explain a simple way to prove or show that gases have mass.

• Calculate the percent composition of H2SO4

for each of the elements

Are the following molecular or empirical formulas? If it is a molecular formula write the empirical formula.

•A) Na2S2O4

•B) Fe4O6

•C) C3H8

• Determine the empirical formula for the following compounds based on their percent composition. Show your work and circle your answer.

• 60.9% As and 39.1% S

• Determine the energy for a Photon of Light whose Frequency is 2.5 x 1015 hertz. Put answer in correct unit.

Classify the following reaction and write a complete balanced equation.

• Butane vapors (C4H10) suddenly explode after a spark ignites them

Write the balanced chem eq…

• Aluminum bromide reacts with chlorine gas to yield aluminum chloride and bromine gas.

Write the balanced chem eq…

• Hydrochloric acid plus sodium hydroxide yield sodium chloride plus water.

• What is the wavelength (in centimeters) of a light wave that has a frequency of 7.05 x 1016 Hz

• Show the formula used for this calculation.

• Some colored light is passed through a prism and the following is observed.

• What would this be called , AND…• WHY are the different lines seen here present?

(explain as completely as you can. A diagram may be helpful)

• The electron configuration for Nitrogen is 1s2 2s2 2p3. What does the 2p3 mean? Be specific…

What ground state element is this?

• 1s2 2s2 2p6 3s2 3p6 4s2 3d6

• Explain (define) what electronegativity is AND show the trends both across the PT and up/down in families.

Draw a simple outline of the periodic table and…

• Show the trend for how ionization energy is periodic

• AND• Explain what ionization energy is a

measurement of...

• What is the trend for the atomic radii (atomic size) on the periodic table...– Across periods (horizontally) – Vertically (in families/groups)

• AND explain WHY for both…

Write the Noble gas (short hand) electron configuration for the following element…

• Calcium and Gold

• How many valence electrons are in the following elements:– Calcium– Sulfur– Iodine

• If Iodine has 7 valence electrons, what specific electron orbital or orbitals are those valence electrons found within and how many in each orbital

• If the titanium ion has a charge of +2, where did the 2 electrons get lost (or taken) from to form the Ti+2 ion?

Classify the following reaction and write a complete balanced equation.

• aluminum chloride reacts with potassium hydroxide

Classify the following reaction and write a complete balanced equation.

• sodium reacts with oxygen gas

Classify the following reaction and write a complete balanced equation.

• Zinc metal reacts with silver (I) nitrate solution– Zinc always forms a +2 ion.