Science 20 Chemistry Review Quiz

0.0050 kJ is ___________ mJ (milijoules)

• 5000 mJ

• 5.0 x 10^-9 mJ

• 500 mJ

• 50 mJ

A solution has 150 mL of sodium chloride in a 500 mL bottle. What is the percent volume concentration?

(3 significant digits)

Water is able to break apart other polar molecules:

The _________ end of water is attracted to the negative end of other molecules.

The _________ end of water is attracted to the positive end of other molecules.

• polar, non-polar

• oxygen, hydrogen

• positive, negative

• negative, positive

A student dissolves 4.5 mol of NaCl in 1.5 L of water to make a solution:

What is the amount concentration of sodium chloride?

• 3 M

• 0.33 M

• 6.75 M

• 2.5 M

50 mL of stock solution is diluted. The dilute solution has a volume of 1000 mL and a concentration of 0.10 mol/L.

What is the concentration of the stock solution?

• 2.0 mol/L

• 0.50 mol/L

• 4.0 mol/L

• 0.10 mol/L

A volumetric flask is used when creating a standard while a pipette is used to dilute a standard.

• True

• False

___Al(s) + ___H₂SO₄(aq) --> ___Al₂(SO₄)₃(aq) + ___H₂(g)

The correct coefficients from left to right are:

Identify the species that undergoes oxidation and the species that undergoes reduction:

Al(s) + 3CuCl₂(aq) --> 2AlCl₃(aq) + 3Cu(s)

• Oxidation: Cu
  
  Reduction: Al

• Oxidation: Al
  
  Reduction: Cu

• Oxidation: Cu

  Reduction: Cl

• Oxidation: Al

  Reduction: Cl

The following 1/2 reaction represents oxidation:

Mg(s) --> Mg²⁺ + 2e

• True

• False

2Al(s) + Fe₂​O₃​(s) → 2Fe(s)+Al₂​O₃​(s)

If the reaction produces 5.0 mol of Al₂O₃(s), how much Al(s) was used?

• 0.2 mol

• 2.5 mol

• 10.0 mol

• 5.0 mol