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Questions and Answers
Which type of substances can be physically separated into their parts?
Which type of substances can be physically separated into their parts?
- Materials (correct)
- Elements
- Pure substances
- Compounds
What causes a chemical change in water that breaks it down into oxygen and hydrogen?
What causes a chemical change in water that breaks it down into oxygen and hydrogen?
- Melting the water
- Filtering the water
- Heating the water
- Running electricity through the water (correct)
Which substances cannot be physically separated or chemically changed into simpler substances?
Which substances cannot be physically separated or chemically changed into simpler substances?
- Materials
- Compounds
- Elements (correct)
- Pure substances
What is a substance that can only be separated into components by chemically changing the substance?
What is a substance that can only be separated into components by chemically changing the substance?
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What does physically separating pure water result in?
What does physically separating pure water result in?
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Study Notes
Physical Separation
- Mixtures can be physically separated into their parts.
- Examples of mixtures include sand and water, salt and pepper, and oil and vinegar.
Chemical Change
- Electrolysis causes a chemical change in water that breaks it down into oxygen and hydrogen.
- Electrolysis is a process that involves the passage of an electric current through a substance.
Elements
- Elements are substances that cannot be physically separated or chemically changed into simpler substances.
- Examples of elements include oxygen, hydrogen, and carbon.
Compounds
- Compounds are substances that can only be separated into components by chemically changing the substance.
- Examples of compounds include water (H2O) and carbon dioxide (CO2).
Physical Separation of Pure Water
- Physically separating pure water results in the same substance, water.
- No new substances are formed during physical separation.
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