HARD
MYP:4-5
IMPORTANT
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When clothes are washed, suggest why it is difficult to remove grease spots from clothing using pure water?

Important Questions on How Do We Use Matter?

HARD
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 2 - How Do We Use Matter?>SOME SUMMATIVE PROBLEMS TO TRY>Q 11
When clothes are washed, if the clothes spoiled with grease spots is treated with a spray on stain, the stain remover washing becomes more effective. Suggest the chemical a stain remover might be, and describe how it works.
MEDIUM
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 2 - How Do We Use Matter?>SOME SUMMATIVE PROBLEMS TO TRY>Q 12
Why don't chemists simply add smaller quantities of the essential oil directly to the other ingredients?
HARD
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 2 - How Do We Use Matter?>SOME SUMMATIVE PROBLEMS TO TRY>Q 13
Explain why the Rf values for any set of specific conditions used in chromatography are constant. 
HARD
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 2 - How Do We Use Matter?>SOME SUMMATIVE PROBLEMS TO TRY>Q 14
In the French perfumery industry pomade is made by placing fresh lavender on highly purified blocks of animal fat in cool dark rooms. After a few days, the fat is dissolved using cool alcohol leaving the essential oils from the flowers behind. Explain how this separation process demonstrates the awareness of the physical properties of essential oils
HARD
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 2 - How Do We Use Matter?>SOME SUMMATIVE PROBLEMS TO TRY>Q 15
A plant physiologist investigating the structure of chloroplasts blended some leaves in a watery solution. Explain the equipment he would use to isolate the oil-soluble components from the mixture of blended leaves.
HARD
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 2 - How Do We Use Matter?>SOME SUMMATIVE PROBLEMS TO TRY>Q 16

The table below classifies the phases of a colloid.

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Suggest how would you use this table to classify the following materials: glass, mist, styrofoam, jelly, pumice stone, fog, whipped cream, salad dressing, paint, ink, and smoke. 

MEDIUM
MYP:4-5
IMPORTANT
MYP By Concept 4&5 Chemistry>Chapter 2 - How Do We Use Matter?>SOME SUMMATIVE PROBLEMS TO TRY>Q 16
Explain why there are no examples of purely gaseous colloids?