Question

1. solid air fresheners gradually shrink because they undergo sublimation

a. true
b. false

1. complete the sentence by using word carbon dioxide, carbon or water

the \fake\ fog produced on a stage forms when solid ______ sublimes.
answer:

1. fill in the blank(s):

__________ is the process in which a solid changes to a liquid state.

1. which of the following substances changes directly from a solid to a gas?

a. naphthalene
b. water ice
c. snow
d. two of the above

1. the substance commonly referred to as dry ice is solid ______.

a. oxygen
b. ammonia
c. nitrogen
d. carbon dioxide

Explanation:

Question 1

Step1: Recall Sublimation

Sublimation is the process where a solid changes directly to a gas without passing through the liquid state. Solid air fresheners shrink because they sublime (solid to gas), so the statement is about a physical change process.

Step2: Evaluate the Statement

Since solid air fresheners do shrink due to sublimation (solid → gas transition, no liquid phase), the statement is true.

Step1: Recall Stage Fog Production

Stage "fog" (like in theatrical productions) is produced by sublimation of solid carbon dioxide (dry ice). Dry ice sublimes (solid → gas) and the cold gas causes water vapor in the air to condense, forming fog.

Step2: Fill the Blank

The solid that sublimes to produce stage fog is carbon dioxide.

Step1: Recall Phase Change Terms

The process where a solid changes to a liquid is called melting (or fusion). Sublimation is solid→gas, deposition is gas→solid, freezing is liquid→solid. Melting is solid→liquid.

Step2: Identify the Process

So the process of a solid changing to a liquid is melting (or fusion).

Answer:

a. TRUE

Question 2