DiCarlo: Mater Test Review

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What is a physical reaction?

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A physical reaction is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include cutting, melting, or dissolving.

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What is a chemical reaction?

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A chemical reaction is a process that involves the transformation of one or more substances into different substances, resulting in a change in chemical composition. Examples include rusting, burning, and spoiling.

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What does it mean that matter is neither created nor destroyed?

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This principle, known as the Law of Conservation of Mass, states that in a closed system, the total mass of substances remains constant, regardless of the processes acting inside the system.

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What happens to the particles in a solid?

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In a solid, particles are closely packed together and vibrate in place, maintaining a fixed shape and volume.

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What happens to the particles in a liquid?

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In a liquid, particles are close together but can move past one another, allowing liquids to take the shape of their container while maintaining a fixed volume.

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What happens to the particles in a gas?

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In a gas, particles are far apart and move freely, filling the entire volume of their container and having no fixed shape or volume.

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What is an example of a physical change?

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An example of a physical change is ice melting into water. The substance remains H2O, but its state changes from solid to liquid.

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What is an example of a chemical change?

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An example of a chemical change is the rusting of iron. Iron reacts with oxygen to form iron oxide, a different substance.

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What is the role of temperature in chemical reactions?

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Temperature can affect the rate of chemical reactions; generally, higher temperatures increase the energy of particles, leading to more frequent and effective collisions.

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What is a reactant in a chemical reaction?

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A reactant is a substance that undergoes change during a chemical reaction, combining with other reactants to form products.