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Questions and Answers
What is the main difference between heterogeneous and homogeneous mixtures?
What is the main difference between heterogeneous and homogeneous mixtures?
Which of the following is an example of a suspension?
Which of the following is an example of a suspension?
Which of the following is a chemical property of matter?
Which of the following is a chemical property of matter?
Which of the following is NOT a characteristic of a chemical reaction?
Which of the following is NOT a characteristic of a chemical reaction?
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Which of the following is an example of a pure substance?
Which of the following is an example of a pure substance?
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What is the difference between an element and a compound?
What is the difference between an element and a compound?
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Which of the following is a property of a substance that can be observed without changing the substance's chemical composition?
Which of the following is a property of a substance that can be observed without changing the substance's chemical composition?
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What is the difference between WHMIS and GHS?
What is the difference between WHMIS and GHS?
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Flashcards
Mixture
Mixture
A combination of two or more pure substances.
Homogeneous Mixture
Homogeneous Mixture
Looks the same throughout; separate components are not visible.
Heterogeneous Mixture
Heterogeneous Mixture
Different components are visible and can be separated.
Solution
Solution
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Chemical Reaction
Chemical Reaction
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Physical Properties
Physical Properties
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Chemical Properties
Chemical Properties
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Pure Substances
Pure Substances
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Study Notes
Mixtures
- A mixture is a combination of two or more pure substances.
- Mixtures can be either homogeneous or heterogeneous.
Homogeneous Mixtures
- Appear the same throughout.
- Components are not visible.
- Examples include solutions like saltwater or air.
Heterogeneous Mixtures
- Appear different throughout.
- Components are visible.
- Three types:
- Mechanical mixtures: Visible different substances, e.g., soil, pizza.
- Suspensions: Different states of matter mixed, e.g., muddy water.
- Colloids: Similar to suspensions but the suspended substance cannot be easily separated, e.g., milk, aerosols, paint, blood.
Solutions
- Components are not visible.
- One substance is dissolved in another.
- Examples include air and pop.
Pure Substances
- All particles are identical.
- Have constant chemical and physical properties.
- Two types:
- Elements: Cannot be broken down further, found on the periodic table.
- Compounds: Chemical combination of two or more elements in a specific ratio, e.g., H₂O (water).
Matter Properties
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Properties describe how a substance behaves.
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Physical properties describe appearance and composition, e.g., color, melting point, conductivity.
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Chemical properties describe a substance's reactivity, e.g., color change, formation of new compounds, heat release.
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Chemical change occurs when new substances with different properties are formed, and energy is either released or absorbed.
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Signs of a chemical change include:
- Heat production or absorption.
- Consumption of starting materials.
- Color changes.
- Formation of new substances.
- Gas bubbles or precipitate formation.
- Difficult to reverse.
- New odors.
- Light production.
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Description
Explore the fascinating world of mixtures and pure substances in this quiz. Learn about homogeneous and heterogeneous mixtures, and discover the characteristics that define pure substances. Test your knowledge with various examples and deepen your understanding of this essential chemistry concept.
