fall review

Which of the following describes an extensive property of Methane gas, CH4?

• Soluble in water

• Mass of 52 grams

• Density of 0.656 g/cm3

• Colorless

Compared to other periodic tables in his time, the table developed by Dmitri Mendeleev-

• enabled him to predict chemical and physical properties of yet undiscovered elements.

• arranged elements in order of increasing atomic number.

• was the only one that arranged elements into groups with similar chemical and physical properties.

• had all elements arranged in perfect order of increasing atomic mass.

Which of the following is an example of a chemical property of an element?

• Iron, Fe, is a solid at room temperature.

• Aluminum is malleable.

• Silicone is shiny.

• Sodium reacts vigorously with water.

Some students used a variety of procedures to investigate four liquid samples. The students recorded the following information.

When Sample K was cooled, solid particles settled out of the liquid.

The mass and volume of Sample L were measured, and the density of Sample L was calculated to be 2.5 g/mL.

Sample M was heated, and the temperature was recorded. All the liquid boiled away at the same temperature and left no residue in the container.

When 2 mL of Nitric Acid was added to Sample N, gas bubbles formed and rapidly rose to the surface of the liquid.

Based on these observations, which sample was clearly identifiable as a pure substance?

• Sample K

• Sample L

• Sample M

• Sample N

Some of the group 16 elements are listed alphabetically in the table below. Which of the following shows the correct arrangement of increasing electronegativity?

1. Oxygen2. Selenium3. Sulfur4. Polonium5. Tellurium

• Polonium, Tellurium, Selenium, Sulfur, Oxygen

• Polonium, Oxygen, Selenium, Sulfur, Tellurium

• Oxygen, Sulfur, Selenium, Polonium, Tellurium

• Polonium, Sulfur, Selenium, Tellurium, Oxygen

Which pair must represent atoms of the same element?

• 52 X___________ 55 X

  24 _____________ 24

• 52X_______________52X

  26________________26

• 55X 3+______________53X

  25__________________25

• 56X 2+_____________56X 3+

  26__________________26

An atom has the electron configuration 1s2, 2s2, 2p3. The electron dot symbol for this element is –

• X:

• .

  . X :

  .

• .

  x:

• .

  :X:

  ..

What is the electron configuration of Zirconium (Zr)?

• [Kr]5s2 4p5

• [Kr]5s2 3d6

• [Kr]5s2 4p3

• [Kr]5s2 4d2

What is the name of the compound C3H8?

• Tricarbon Octahydride

• Carbon trihydride

• Carbon oxide

• Dicarbon Heptahydride

What is the chemical formula for Calcium Phosphate?

• Ca P2 O4

• Ca P O4

• Ca3 (PO4) 2

• Ca2 (PO4) 5