LBC Chap 5 Review

Which substance do you predict will dissolve in water?

• Al (s)

• SiO₂ (s)

• Cu(s)

• CaCl₂(s)

Answer explanation

Based on the properties of the different kinds of bonds the ionic compound of CaCl₂ is most likely to dissolve in water.

Which of these compounds will not dissolve at all in water?

• Al (s)

• SnF₂ (s)

• Fe₂(SO₄)₃(s)

• CaCl₂(s)

Answer explanation

Based on the properties of the different kinds of bonds the metallic substance of Al is least likely to dissolve in water.

Which substance can you predict will conduct electricity based on the formula and physical form described?

• C₄H₁₀ (l)

• AlCl₃(aq)

• C₈H₁₈(aq)

• LiCl(s)

Answer explanation

To be able to conduct electricity the substance needs to have a metal atom in it. A solid metal by itself will conduct, but here we only have compounds. When we look at AlCl₃(aq) and LiCl(s) we have to look at the state it's in to see if it conducts. Ionic compounds do not conduct when they are solid (s), they only conduct when they are dissolved in water (aq).

Which of these is the best description of a metal?

• soluble in water, conductive

• soluble in water, nonconductive

• insoluble in water, conductive

• insoluble in water, nonconductive

Answer explanation

Use this flow chart to help you with basic classification of substances based on conductivity and solubility.

What type of bonding holds the atoms of ethanol, C₂H₆O, together?

• ionic

• metallic

• network covalent

• molecular covalent

Answer explanation

C₂H₆O, is made of only nonmetals. This makes it one of the two covalent types. Usually unless it's pure C, Si, or SiO₂ it is just a molecular covalent compound.

Based on their chemical structures, which of these materials is likely to be soluble in water?

• C (s) (diamond)

• C₂₀H₄₂(s)

• Fe(s)

• Ba(NO₃)₂(s)

Answer explanation

Remember that the different types of bonds have different properties. Of thee choices we have a network covalent (C), a metal (Fe), a covalent compound (C₂₀H₄₂) and and ionic compound (Ba(NO₃)₂). Typically ionic compounds, and some molecular compounds, are typically the ones soluble in water.

Tags

NGSS.HS-PS1-1

What does the term soluble mean?

• Can dissolve into something else

• Can not dissolve into something else

• To disperse evenly into another substance.

• A property that describes how well a substance transmits electricity.

What type of bonding has the following properties:

Can dissolve in water.

Tend to be solids.

Can conduct electricity when dissolved in water.

• Metallic

• Ionic

• Molecular Covalent

• Network Covalent

Answer explanation

Be sure to learn the basic properties of each type of bonding.

Tags

NGSS.HS-PS1-3

Which of the following substances will dissolve in water?

• Ca

• NO₂

• Si

• CH₄

• CuSO₄

Answer explanation

Be sure to learn the basic properties of each type of bonding.

Select which of the following statements are true.

• Copper(II) sulfate, CuSO₄, does not dissolve in water.

• Glass, made of silicon dioxide, SiO₂, does not dissolve in water.

• Ethanol, C₂H₆O, dissolves in water but does not conduct electricity.

• Brass, also called copper zinc, CuZn, conducts electricity.

• Pure iron, Fe, dissolves in water.

Answer explanation

Remember that different types of atoms can tell us what kind of bonds are present. CuSO₄ is an ionic compound so it dissolves in water. Fe is a pure metal, which usually don't dissolve in water.