Chemical Reactions quiz
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How do chemists test for carbon dioxide?
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More questions about Chemical Reactions
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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What fills the big bubbles in boiling water?
Answer: Steam
Why: Boiling only pulls water molecules apart from each other; splitting them into hydrogen and oxygen takes a reaction such as electrolysis.
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What does an atom lose when oxidized?
Answer: Electrons
Why: The name comes from oxygen, yet sodium is oxidized by chlorine when table salt forms, losing electrons with no oxygen at all.
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Where does the oxygen plants release come from?
Answer: Water
Why: Scientists widely believed it came from carbon dioxide until a 1941 study using heavy oxygen-18 traced it to water.
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What happens to wood's atoms when it burns?
Answer: They rearrange
Why: The wood's atoms end up in gases, smoke and ash, which together weigh as much as the wood plus the oxygen it burned with.
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Which word describes the light of a glow stick?
Answer: Chemiluminescence
Why: Cold slows the reaction inside, so a chilled glow stick glows dimmer but lasts longer.
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What reacts with sugar to brown a seared steak?
Answer: Amino acids
Why: The browning speeds up above about 140 °C, so boiled meat, stuck at 100 °C, does not brown while seared meat does.
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