Multiple Choice
Which type of flame proving method is commonly used by direct spark ignition controls in chemical processes?
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1. Intro to General Chemistry
Chemical Properties
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Which of the following best describes reactants in a chemical reaction?
A
Catalysts that speed up the reaction but are not consumed
B
Substances that are present at the start of a chemical reaction and undergo change
C
Elements that remain unchanged during a chemical reaction
D
Substances that are produced as a result of a chemical reaction
Verified step by step guidance1
Understand the definition of reactants in a chemical reaction: Reactants are the starting substances that undergo chemical change during the reaction.
Recognize that catalysts are substances that speed up a reaction but are not consumed or changed permanently, so they are not reactants.
Note that elements or substances that remain unchanged during a reaction are neither reactants nor products; they might be catalysts or inert substances.
Identify that products are substances formed as a result of the chemical reaction, which is different from reactants.
Conclude that the best description of reactants is: substances present at the start of a chemical reaction that undergo change.
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