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Questions and Answers
Which of the following is an example of a physical change?
What evidence proves a chemical reaction occurred when two substances' temperatures change from 23 degrees Celsius to 27 degrees Celsius?
Temperature change
Which of the following would not be evidence of a chemical change?
A ________ _________ occurs when two or more molecules interact forming new molecules.
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Which type of evidence of a chemical reaction is demonstrated when a gas is formed?
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A ___________________ change occurs when two or more substances join to form new substances with new chemical properties.
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Which of the following is an example of a chemical change?
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A __________________ change does not change the substance into anything new.
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What type of change occurs when two substances are combined and a gas is produced?
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What are the 5 signs of physical change?
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Examples of chemical changes include what?
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What is a physical change?
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What are more examples of chemical changes?
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What are examples of physical changes?
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What are the 5 signs of chemical changes?
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Study Notes
Physical Changes
- Dissolving salt in water is an example of a physical change.
- Tearing paper is a physical change, while instances like milk souring or food digesting are chemical changes.
- Physical changes do not create new substances but may alter appearance or state.
- Common examples include boiling water, dissolving sugar, and dicing vegetables.
Chemical Changes
- A chemical reaction occurs when two or more molecules interact, leading to the formation of new molecules with new properties.
- Key indicators of a chemical change include unexpected color change, temperature change, formation of gas, and precipitate.
- Examples of chemical changes include iron rusting, gas burning, eggs cooking, and bread rising.
- Bread rising is often cited as a chemical change due to yeast fermentation.
Evidence of Change
- An example of physical change evidence is a change in size.
- For chemical changes, the formation of gas can indicate a chemical reaction has occurred.
- A change in temperature can suggest a chemical reaction, especially if heat is produced or absorbed.
Signs of Change
- Five signs of physical change include changes in state, color, temperature, shape, and texture.
- Five signs of chemical changes are unexpected color change, temperature change, combustion or burning, presence of precipitates, and the formation of bubbles.
Definitions
- A physical change does not alter the chemical composition of a substance.
- A chemical change results in new substances with distinct chemical properties.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Explore the concepts of physical and chemical changes with these flashcards. This quiz covers various examples such as dissolving salt in water and tearing paper. Test your understanding and reinforce your knowledge about these fundamental science topics.
