Alchemy Quiz 14

An ionic compound is formed when:

• an atom gains an electron.

• a neutral compound gains an electron.

• a cation bonds to an anion.

• a hydroxide ion bonds to a nitrate ion.

Answer explanation

A cation is positively charged because it has transferred one or more electrons to an anion, which then becomes negatively charged. This bonding leads to more stability for both ions, and a net charge of zero.

Which of these dissolves readily in water?

• Al_(s)

• Cu_(s)

• CaCl_2(s)

• SiO_2(s)

Answer explanation

Ionic compounds are salts which will dissociate into individual ions in water.

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

For more information on metal properties:

https://www.xometry.com/resources/materials/metal/

Which of these does not readily conduct electricity?

• sugar dissolved in water

• a piece of aluminum foil

• salt dissolved in water

• a copper wire

Answer explanation

You may wish to check your lab results for Alchemy Lesson 25.

Tags

NGSS.MS-PS2-3

One carbon atom bonds with four hydrogen atoms to form methane (CH₄). The bonds are formed when hydrogen atoms share electrons with carbon atoms. These bonds are:

• covalent bonds

• ionic bonds

• electronic bonds

• hydrogen bonds

Answer explanation

You may wish to review your results and resources for Alchemy Lesson 26.

Tags

NGSS.MS-PS1-1

Based on its physical properties, what type of bonding is found in methanol, CH₄O_(l)?

• metallic

• ionic

• network covalent

• molecular covalent

Answer explanation

You may wish to review your results and resources for Alchemy Lesson 26.

Which type of substance will conduct electricity the best after dissolving in water?

• metallic

• ionic

• molecular covalent

• network covalent

Answer explanation

You may wish to review your results and resources for Alchemy Lesson 26.

Which type of bonding is found in zinc, Zn(s)?

• metallic

• ionic

• molecular covalent

• network covalent

Answer explanation

You may wish to review your results and resources for Alchemy Lesson 26.

Tags

NGSS.HS-PS1-3

Sugar is an example of a compound that is held together by molecular covalent bonding. Therefore, sugar is:

• hard but brittle, fracturing along planes.

• durable, rigid, and difficult to break.

• bendable and malleable.

• relatively easy to separate into smaller pieces.

Answer explanation

You may wish to review your results and resources for Alchemy Lesson 26.

Tags

NGSS.MS-PS3-4

Which of these is the best description of a network covalent compound?

• soluble in water, conductive

• soluble in water, nonconductive

• insoluble in water, conductive

• insoluble in water, nonconductive

Answer explanation

You may wish to review your results and resources for Alchemy Lesson 26.