Identify the Change of State that Occurs - Effects of Mist on Stage - Chemistry Assignment Help

Assignment Task :

Objectives

This assessment item relates to the unit learning outcomes 1 and 2.

Details

This series of questions is designed to help you in your comprehension of the introductory concepts presented in Modules 1, 2, 3, 4 and 5 of this unit.  

Question 1                                                                                                                             

For each of the following situations, comment as to whether particles are gaining or losing energy during the process and then identify the change of state that occurs.  

1. The water level in a fish tank decreases even though the tank does not leak 

Gaining energy, the process is evaporation.

2. During winter in the Snowy Mountains, ice forms on a metal walkway when raindrops fall on it 

Energy has decreased, the process is freezing.

3. Dry ice is used to provide the effects of mist on stage

Energy is being gained, the process is subliming. 

Question 2                                                                                                                      

Identify each of the following as either a pure substance, a homogenous mixture or a heterogeneous mixture and briefly explain your decision:

1. Sparkling mineral water in a glass

Homogenous mixture, this is because it has a uniform composition. 

2. Brass 

Heterogeneous mixture, this is because brass is made up of different compositions. 

3. Aluminium foil

If the foil is of pure aluminium, it is a pure substance. This is because it is a single definite composition.

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