Podcast
Questions and Answers
Which of the following best distinguishes a pure substance from a mixture?
Which of the following best distinguishes a pure substance from a mixture?
- Pure substances have variable compositions, while mixtures have fixed compositions.
- Pure substances always contain multiple elements, whereas mixtures contain only one.
- Pure substances have a fixed composition, while mixtures have variable compositions. (correct)
- Pure substances can be separated by physical means, while mixtures cannot.
Which physical property is described by ‘the temperature at which a liquid turns into a gas’?
Which physical property is described by ‘the temperature at which a liquid turns into a gas’?
- Boiling Point (correct)
- Melting Point
- Solubility
- Viscosity
Which of these is NOT an indication of a chemical change?
Which of these is NOT an indication of a chemical change?
- Change in state (correct)
- Formation of a precipitate
- Change in color
- Change in temperature
What is the best description of the physical property of lustre?
What is the best description of the physical property of lustre?
Consider the statement, ‘Can be hammered thin’. Which physical property does it describe?
Consider the statement, ‘Can be hammered thin’. Which physical property does it describe?
Which of these processes is an example of a physical change?
Which of these processes is an example of a physical change?
What characterizes a mechanical mixture?
What characterizes a mechanical mixture?
Which property relates to how easily a liquid flows?
Which property relates to how easily a liquid flows?
Flashcards
Pure Substance
Pure Substance
A substance with a fixed composition that cannot be broken down into simpler substances by physical means. Examples include elements like gold and compounds like water.
Mixture
Mixture
A combination of two or more substances that are physically mixed but not chemically combined. Their composition is variable, and they can be separated by physical means.
Solution
Solution
A type of mixture where the components are evenly distributed and appear as a single substance.
Mechanical Mixture
Mechanical Mixture
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Physical Change
Physical Change
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Chemical Change
Chemical Change
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Exothermic Reaction
Exothermic Reaction
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Endothermic Reaction
Endothermic Reaction
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Study Notes
Matter Classification
- Matter is anything that has mass and takes up space
- Matter is classified into pure substances and mixtures
- Pure Substances: Elements and compounds
- Elements: Single type of atom, cannot be broken down further
- Compounds: Two or more different elements chemically combined
- Mixtures: Combination of two or more pure substances, not chemically bonded
- Homogeneous mixtures (solutions): Uniform composition throughout
- Heterogeneous mixtures: Non-uniform composition
Mixtures vs. Solutions
- Mixtures: Substances mixed together but not chemically bonded, can be separated by physical means
- Solutions are homogeneous mixtures, components evenly distributed
Physical vs. Chemical Properties
- Physical properties: Can be observed or measured without changing the substance's composition
- Examples: color, texture, density, melting point, boiling point, solubility
- Chemical properties: Describe how a substance reacts with other substances to form new substances
- Example: flammability, reactivity with acids, oxidation, combustibility
Physical vs. Chemical Changes
- Physical change: alters a substance's appearance without changing its chemical composition
- Chemical change: involves a reaction that produces one or more new substances with different properties
- Examples of chemical changes: burning, rusting, reacting with an acid, cooking, decomposition
Indications of Chemical Change
- Change in color
- Production of gas (bubbles)
- Formation of a precipitate (solid formed from a solution)
- Release of heat or light
- Odor change
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Description
Test your understanding of matter classification, including pure substances and mixtures. Explore the differences between physical and chemical properties, as well as the characteristics of homogeneous and heterogeneous mixtures. This quiz will solidify your knowledge of fundamental chemistry concepts.
