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Questions and Answers
Differentiate between a homogeneous mixture and a heterogeneous mixture.
Differentiate between a homogeneous mixture and a heterogeneous mixture.
A homogeneous mixture has even distribution, while a heterogeneous mixture has uneven distribution.
Explain the main difference between a compound and a mixture.
Explain the main difference between a compound and a mixture.
A mixture is two or more substances that are physically combined, and a compound is two or more substances that are chemically combined.
What type of substance is Table Salt?
What type of substance is Table Salt?
- Heterogeneous mixture
- Element
- Compound (correct)
- Homogeneous mixture
What type of mixture is Milk?
What type of mixture is Milk?
What type of substance is Oxygen?
What type of substance is Oxygen?
What type of mixture is Lemonade?
What type of mixture is Lemonade?
What type of substance is Water?
What type of substance is Water?
What type of substance is Carbon Dioxide?
What type of substance is Carbon Dioxide?
What type of mixture is Vegetable Soup?
What type of mixture is Vegetable Soup?
What type of mixture is Peanut Butter?
What type of mixture is Peanut Butter?
Explain the difference between physical properties and chemical properties, and list three examples of each.
Explain the difference between physical properties and chemical properties, and list three examples of each.
Explain the difference between physical changes and chemical changes.
Explain the difference between physical changes and chemical changes.
What type of change is boiling?
What type of change is boiling?
What type of change is crumpling?
What type of change is crumpling?
What type of change is burning?
What type of change is burning?
What type of change is freezing?
What type of change is freezing?
What type of change is evaporating?
What type of change is evaporating?
What type of change is rotting?
What type of change is rotting?
What type of change is rusting?
What type of change is rusting?
What type of change is sawing?
What type of change is sawing?
What type of change is crushing?
What type of change is crushing?
List evidence that a chemical change has occurred.
List evidence that a chemical change has occurred.
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Study Notes
Mixtures vs. Compounds
- Homogeneous mixtures have a uniform composition, while heterogeneous mixtures have distinct, separate components.
- A mixture is a physical combination of two or more substances, while a compound is a chemical combination of two or more substances.
Examples of Mixtures and Compounds
- Table salt is classified as a compound, formed by the chemical combination of sodium and chlorine.
- Milk is a heterogeneous mixture, consisting of different components such as fat and water.
- Lemonade is a homogeneous mixture, where the components are evenly distributed.
- Water and carbon dioxide are both compounds, made of chemically combined elements.
Elements
- Oxygen is considered an element, a fundamental substance that cannot be broken down into simpler substances.
Types of Changes
- Physical properties can be observed without altering the substance's chemical identity (e.g., mass, volume, shape).
- Chemical properties require a change in the substance's chemical identity to be observed, such as toxicity, flammability, and combustibility.
- Physical changes include boiling, crumpling, freezing, evaporating, sawing, and crushing, affecting a substance's physical attributes.
- Chemical changes involve alterations that lead to a new substance, evidenced by properties such as light release, temperature changes, odor changes, sudden color changes, gas production, and the formation of solids.
Evidence of Chemical Changes
- Indications that a chemical change has occurred include:
- Release of light.
- Temperature change.
- Change in odor.
- Sudden color change.
- Production of gas.
- Formation of a solid (precipitate).
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