Elements, Mixtures & Compounds (FuseSchool)
Medium-difficulty multiple-choice quiz based on the FuseSchool video: definitions and tests distinguishing elements, mixtures and compounds using iron and sulfur.
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Quiz Questions & Answers
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Question 1: According to the video, which definition best describes an element?
A substance that cannot be broken down into anything simpler
A substance made of two or more elements in fixed proportions
A substance consisting of two or more substances mixed together not chemically bonded
A substance that always conducts electricity
Question 2: Which observed test result in the video indicates that iron and sulfur in a simple mixture retain separate identities?
The mixture turns completely black on brief heating
A magnet attracts only the iron filings, leaving sulfur behind
The mixture melts at a single sharp temperature
The mixture produces toxic hydrogen sulfide when acid is added
Question 3: When the iron-sulfur mixture is briefly heated and a new black solid forms, what key change has occurred?
Sulfur evaporates leaving pure iron behind
The mixture becomes a purer physical mixture with larger particles
Iron and sulfur chemically bond to form a compound (iron(II) sulfide)
The iron becomes magnetic while sulfur becomes magnetic too
Question 4: Why does iron react with hydrochloric acid to give a 'pop' test but sulfur does not, as shown in the video?
Iron produces sulfur dioxide instead of hydrogen
Iron reacts to produce hydrogen gas, which ignites with a pop; sulfur shows no visible reaction
Both produce hydrogen but sulfur masks the sound
Sulfur reacts too violently to hear a pop, while iron reacts slowly
Question 5: In the compound iron(II) sulfide made by heating, which test outcome from the video shows it behaves differently than the original elements?
It floats on water while both elements sink
It produces hydrogen gas with acid like pure iron without any other gases
It reverts back to separate iron and sulfur when mixed with paper
It is not attracted to a magnet and cannot be separated physically
Question 6: The video warns that adding hydrochloric acid to iron(II) sulfide produces a gas. Which safety-related conclusion follows?
No gas forms, so no special precautions are needed
The acid neutralizes the compound making it safe to handle without protection
The reaction releases toxic hydrogen sulfide, so it should be done in a fume cupboard
Only harmless oxygen is released, so normal lab air is fine
Question 7: If a student heated a mixture with excess iron and then used a magnet, why might the product still be attracted to the magnet according to the video?
Heating converts sulfur into a magnetic form that pulls the product
The magnet induces a temporary magnetism in all black solids
Unreacted excess iron remains magnetic and can be attracted by the magnet
Iron(II) sulfide is always magnetic regardless of composition