Podcast
Questions and Answers
Which property is NOT associated with acids?
Which property is NOT associated with acids?
- Feeling slippery (correct)
- Having a pH less than 7
- Tasting sour
- Turning litmus red
What is the pH value of a neutral substance?
What is the pH value of a neutral substance?
- 7 (correct)
- 10
- 5
- 8
Which reaction demonstrates the law of conservation of mass?
Which reaction demonstrates the law of conservation of mass?
- Baking a cake
- Mixing baking soda and vinegar (correct)
- Mixing sand and salt
- Melting ice into water
Which of the following is NOT a characteristic of bases?
Which of the following is NOT a characteristic of bases?
Which change demonstrates a chemical reaction?
Which change demonstrates a chemical reaction?
How can the dissolving of a substance be accelerated?
How can the dissolving of a substance be accelerated?
In what situation would the balance show less mass?
In what situation would the balance show less mass?
What characteristic is unique to neutrals?
What characteristic is unique to neutrals?
What is the result of the neutralization process?
What is the result of the neutralization process?
Why is boiling water considered a physical change?
Why is boiling water considered a physical change?
Flashcards
Acid
Acid
A substance that turns litmus paper red, has a pH less than 7, and tastes sour.
Base
Base
A substance that turns litmus paper blue, has a pH greater than 7, and tastes bitter.
Neutral
Neutral
A substance that is neither acidic nor basic, with a pH of 7, and often has no particular taste.
Physical Change
Physical Change
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Chemical Change
Chemical Change
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Law of Conservation of Mass
Law of Conservation of Mass
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Solubility
Solubility
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Neutralization
Neutralization
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pH Scale
pH Scale
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Physical Property
Physical Property
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Study Notes
Acids, Bases, and Neutrals
- Acids have a sour taste, turn litmus red, and have a pH less than 7.
- Bases have a bitter taste, turn litmus blue, and have a pH greater than 7.
- Neutral substances have a pH of 7, do not change litmus color, and have no particular taste.
- Examples of acids include lemon and tomato.
- Examples of bases include bleach and soap.
- Examples of neutrals include salt and water.
Neutralization
- Neutralization is a chemical reaction between an acid and a base, producing a salt and water.
pH
- pH is a measure of the acidity or basicity of a solution.
- It ranges from 0 to 14.
- A pH of 7 is neutral.
- A pH less than 7 is acidic.
- A pH greater than 7 is basic.
Physical vs. Chemical Changes
- A physical change alters the appearance or form of a substance without changing its chemical composition.
- A chemical change results in the formation of a new substance with different properties.
- Examples of physical changes include cooking an apple, and folding a piece of paper.
- Examples of chemical changes include neutralization and boiling water.
- Changing shape or size is a physical change.
Solubility
- Solubility is the ability of a substance to dissolve in a solvent.
- Solubility depends on temperature.
- As temperature increases, solubility generally increases (with some exceptions).
Law of Conservation of Mass
- The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.
- The total mass of the reactants equals the total mass of the products. This means mass that is accounted for in all parts of the reaction, in the product, and reactants is the same.
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