AP Chemistry Flashcards: Introduction for Reactions
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
When a clear solution is mixed with another and a cloudy solid forms, what is this phenomenon called and what does it indicate?
This is called precipitate formation. It is a common piece of evidence indicating that a chemical change has taken place.
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When a clear solution is mixed with another and a cloudy solid forms, what is this phenomenon called and what does it indicate?
This is called precipitate formation. It is a common piece of evidence indicating that a chemical change has taken place.
What are two examples of physical changes mentioned in the text?
Two examples of physical changes are phase changes (like melting or boiling) and the formation or separation of mixtures.
Is dissolving sugar in water a physical or chemical change?
This is a physical change because it involves the formation of a mixture, but the chemical compositions of the sugar and water are not altered.
Why is a color change listed as only 'possible evidence' of a chemical change?
A color change is only possible evidence because it can also occur during a physical change, such as mixing two different colored paints.
List four common pieces of evidence that suggest a chemical change has occurred.
Four possible signs of a chemical change are the production of heat or light, the formation of a gas, the formation of a precipitate, and a color change.
Define a physical change.
A physical change is one that alters the properties of a substance, such as its state of matter, but does not change its fundamental chemical composition.
A firework explodes, producing bright light and heat. What type of change is this an example of?
This is a chemical change, as the production of heat and light are two key indicators that new substances are being formed.
Define a chemical change.
A chemical change is a process that transforms one or more substances into entirely new substances with different properties and compositions.
If you mix two substances and observe bubbling, what evidence of a chemical change are you witnessing?
The bubbling indicates the formation of a gas, which is a possible sign that a chemical change is occurring.
What is the key difference between physical and chemical changes regarding a substance's composition?
In a physical change, the chemical composition of the substance remains the same, whereas in a chemical change, the composition is altered to form a new substance.