Blue litmus paper turns what color in an acid?
AnswerRed
Litmus is a dye that turns red in acidic solutions and blue in basic ones.
Science · Facts & stats
Lab facts & stats
7 fact-checked facts about science labs and experiments, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
In an experiment, what is the group that does not receive the treatment being tested called?
AnswerThe control group
A control group provides a baseline, so any difference in the test group can be linked to the treatment.
Going deeper
The shallow lidded dish used to grow bacteria is named after which scientist?
AnswerJulius Richard Petri
German bacteriologist Julius Richard Petri developed the dish in the 1880s while working in Robert Koch's lab.
The cone-shaped flask with a flat bottom and narrow neck is named after which chemist?
AnswerEmil Erlenmeyer
German chemist Emil Erlenmeyer introduced the conical flask in the 1860s; its shape lets you swirl liquids without spilling.
Which lab burner, named after a 19th-century German chemist, mixes gas with air to make a hot flame?
AnswerBunsen burner
The Bunsen burner is named for Robert Bunsen; adjusting its air hole changes the flame's heat.
Expert level
What is the SI unit for amount of substance?
AnswerThe mole
The mole is one of the seven SI base units and is used to count atoms, molecules or ions in chemistry.
Which glassware delivers precise, adjustable volumes of liquid through a tap, as in titrations?
AnswerA burette
A burette is a long graduated tube with a stopcock that lets chemists add liquid drop by drop.
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