15 Questions
What is the purpose of a formulation?
To design useful products with carefully measured amounts of chemicals
Why is paper chromatography used?
To separate mixtures of soluble substances and identify the substances present
Why do pure substances have a sharp melting point?
Because they are not mixed with other substances
Which types of substances are often separated using paper chromatography?
Colored substances like food colorings and inks
What can be inferred about the chemicals in a formulation?
They are carefully measured and have specific purposes in the formulation
What is the common characteristic of substances separated using paper chromatography?
They have varying melting points
What is the mobile phase in chromatography?
The solvent that moves through the paper
How can a paper chromatogram distinguish between pure and impure substances?
A pure substance produces one spot, while an impure substance produces two or more spots
What can be used to identify unknown chemicals in chromatography?
Rf values
What happens if oxygen is present in a test tube?
A glowing splint relights when held inside
How can hydrogen be identified in a test tube?
A lighted splint held near its mouth ignites with a squeaky pop
What does carbon dioxide not support?
Combustion
What are the two phases that chromatography relies on?
Mobile phase and stationary phase
What is used to calculate Rf values in chromatography?
Distance traveled by the spot / Distance traveled by the solvent
What does a lighted splint do when hydrogen is present?
Ignites with a squeaky pop
Test your knowledge about pure substances and their sharp melting points with this quiz. Identify the unique characteristics of pure substances and their behavior during phase transitions.
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