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Questions and Answers
What is a characteristic of solids according to the particle model of matter?
What is a characteristic of solids according to the particle model of matter?
- Tightly packed particles. (correct)
- Far apart particles.
- Particles vibrate in their positions.
- Particles move freely in all directions.
Which statement best describes the behavior of particles in gases?
Which statement best describes the behavior of particles in gases?
- Particles have space between them.
- Particles attract each other.
- Far apart particles. (correct)
- Tightly packed particles.
What distinguishes a chemical change from a physical change?
What distinguishes a chemical change from a physical change?
- Alterations in physical properties.
- Formation of new substances. (correct)
- Reversible in nature.
- No change in chemical composition.
What is a defining characteristic of solutions?
What is a defining characteristic of solutions?
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How are mixtures distinguished from compounds?
How are mixtures distinguished from compounds?
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Study Notes
Characteristics of Solids
- Solids have closely packed particles that vibrate in fixed positions, providing definite shape and volume.
Behavior of Particles in Gases
- In gases, particles are far apart and move freely at high speeds, resulting in no fixed shape or volume.
Chemical vs. Physical Change
- A chemical change involves the formation of new substances with different properties, while a physical change alters the form or appearance without changing the substance itself.
Defining Characteristic of Solutions
- Solutions are homogeneous mixtures where one substance (solute) is completely dissolved in another (solvent), resulting in a uniform composition.
Distinction Between Mixtures and Compounds
- Mixtures are combinations of two or more substances that retain their individual properties, while compounds consist of two or more elements chemically bonded together, resulting in new properties.
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