Chapter 18 Pre-test

What type of bonding is present in salts?

• Covalent

• Ionic

• Metallic

• Hydrogen bonding

When salts dissolve in water which type of secondary bonding occurs?

• Hydrogen bonding

• Dipole-dipole interactions

• Ion-dipole interactions

• Dispersion forces

Explain how electrical conductivity can be used to measure the salinity of water?

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A student wants to use gravimetric analysis to determine the amount of salt in a water sample. What steps would they have to follow?

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What is the molar ratio of NH₃:O₂ in the following reaction:

4NH₃ (g) + 3O₂ (g) --> 2N₂ (g) + 6H₂O (l)

• 4:3

• 4:2

• 3:2

• 3:4

The following precipitation reaction was performed:

MgCl₂ (aq) + Na₂CO₃ (aq) --> MgCO₃ (s) + 2NaCl (aq)

If 21.1 g of MgCl₂ was reacted with an excess of Na₂CO₃, determine the mass of MgCO₃ that would be formed.

• 21.1 g

• 18.7 g

• 9.35 g

• 37.4 g

A student carries out the following reaction:

H₂SO₄ (aq) + 2NaOH --> Na₂SO₄ (aq) + 2H₂O

If there is 90.0 g of H₂SO₄ and 70.0 g of NaOH, what is the limiting reagent

• H₂SO₄

• NaOH

• Na₂SO₄

• H₂O