JasonWongCHEM1311-06P-PRE

The number of significant figures in 100850.0 is

• 4

• 5

• 7

• 6

Round off  ‘907506’ to four significant figures.

• 00 91 x 10⁵

• 9100

• 9076

• 9.075 x 10⁵

Which of the following is the largest volume?

• 10 cm³

• 2 m³

• 44 mL

• 100 dm³

Identify a cation.

• An atom that has lost an electron.

• An atom that has gained an electron.

• An atom that has lost a proton.

• An atom that has gained a proton.

    What is the charge on the Cr ions in Cr₂O₃?

• 2-

• 1+

• 2+

• 3+

  Give the correct formula for aluminum sulfate.

• Al₂SO₄

• Al(SO₄)₃

• Al₃(SO₄)₂

• Al₂(SO₄)₃

Halogen anions carry a charge of:

• 1+

• 2-

• 1-

• 2+

1.     What is the empirical formula for the following molecular formula: C₅H₁₂?

• C₅H₁₂

• CH₃

• CH₂

• C_2.5H₆

Convert 50mL to L

• .5L

• .005 L

• .05L

• .0005L

Identify Correct formula for Dinitrogen pentoxide

• N₂O₄

• 2NO₅

• N₂O₅

• 2N₅O