Froggy Jumps Chromatography EditionVersion en ligne hi Chromatography Edition par MARIANA GOMEZ ARTUNDUAGA 1 What is chromatography used for? a Melting substances together b Separating mixtures into their components c Creating new chemical elements 2 What are the two main phases in chromatography? a Mobile phase and stationary phase b Liquid phase and solid phase c Acidic phase and basic phas 3 What is the mobile phase in chromatography? a The phase that moves through the system b The phase that stays still c The phase that evaporates 4 What is the stationary phase in chromatography? a The phase that dissolves completely b The phase that always changes color c The phase that remains fixed 5 What is paper chromatography? a A method that burns substances b A method that uses paper to separate substance c A method that freezes substances 6 What is thin-layer chromatography (TLC) used for? a Measuring temperature b Analyzing small amounts of substances c Producing electricity 7 What is the role of the solvent in chromatography? a To make the substances heavier b To destroy the substances c To carry the substances through the system 8 Why do different substances travel at different speeds in chromatography? a Due to their different affinities for the stationary phase b Because they have different weights c Because they react with each other 9 What does the Rf value represent in chromatography? a The boiling point of the solvent b The total weight of the substance c The ratio of distance traveled by a substance to the solvent front 10 How is the Rf value calculated? a Distance traveled by the substance + Distance traveled by the solvent b Distance traveled by the substance ÷ Distance traveled by the solvent c Distance traveled by the solvent × Distance traveled by the substance 11 What are some common solvents used in chromatography? a Sand, iron, and salt b Water, ethanol, and acetone c Mercury, gold, and copper
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