Podcast
Questions and Answers
What observation indicates that a chemical reaction has likely occurred?
What observation indicates that a chemical reaction has likely occurred?
- The temperature is maintained at 22°C.
- The liquid remains clear.
- The presence of a strong smell.
- The change of the dark solid to a white solid. (correct)
Which characteristic remained unchanged before and after the experiment?
Which characteristic remained unchanged before and after the experiment?
- The smell of the reaction.
- The nature of the solid.
- The color of the liquid.
- The temperature of the liquid. (correct)
Why is retaining the strong smell significant in the observations?
Why is retaining the strong smell significant in the observations?
- It indicates the solid dissolved in the liquid.
- It confirms that a physical change has occurred.
- It suggests that the original chemical has not completely reacted. (correct)
- It means the reaction produced gas bubbles.
What can be inferred about the solid after the experiment?
What can be inferred about the solid after the experiment?
Which of the following most accurately describes the dark solid before the experiment?
Which of the following most accurately describes the dark solid before the experiment?
Flashcards
Chemical Reaction
Chemical Reaction
A change in the appearance, color, or state of matter of a substance that indicates a new substance has been formed.
Chemical Change
Chemical Change
A process where substances react with each other to form new substances with different properties.
Physical Property
Physical Property
Any characteristic that can be observed or measured without changing the substance's chemical composition.
Chemical Property
Chemical Property
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Reactant
Reactant
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Study Notes
Observation of a Chemical Reaction
- A dark solid changed to a white solid
- A strong smell was present before and after the reaction
- The liquid remained clear and at room temperature (22°C) throughout the reaction.
- The visual change (color change) from dark solid to white solid indicates a new substance has formed. Chemical changes often result in a new substance being create with different properties.
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Description
This quiz explores the key observations during a chemical reaction, particularly focusing on visual changes, odor presence, and physical states. You'll assess how these changes indicate the formation of a new substance with distinct properties. Test your understanding of chemical reactions and their characteristics.
