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What is the function of the optical brighteners used in washing powders?
To make white clothes look even whiter
To remove oil stains
To soften the water
Sparkling water consists of carbon dioxide dissolved in water. Which answer describes the carbon dioxide in this situation?
What happens if a biological washing powder is used at a high temperature?
The enzymes are denatured so food stains are not removed
The detergent is less effective so mud stains are not removed
Sugary dirt is left on the clothes
What is the cleaning agent used when clothes are dry cleaned?
Water with a special additive
A solvent other than water
Acetone is used to remove nail polish because the polish:
Is insoluble in acetone
Dissolves in acetone but not in water
Dissolves in water but not in acetone
Which of the answers is NOT true of detergents?
They're hydrophilic at one end and hydrophobic at the other
They can be used for dry cleaning