ch15.2 Reinforcement Properties of Matter Editable 1 .pdf - Name ... - Free Printable

Based on my analysis of the "Properties of Matter" worksheet, I can now provide a complete solution to the problem. The worksheet is divided into two main sections: a vocabulary matching exercise and a set of short-answer questions.

Solution to the Vocabulary Section

The first section requires matching key terms with their correct definitions. Here are the correct pairings:

1. Intensive property: A property that does not depend on the amount of matter present. (e.g., color, density, melting point)
2. Extensive property: A property that depends on the amount of matter present. (e.g., mass, volume, length)
3. Physical change: A change in which the substance's identity remains the same; no new substances are formed. (e.g., cutting, melting, dissolving)
4. Chemical change: A change in which one or more substances are converted into different substances with new chemical properties. (e.g., burning, rusting, digesting)
5. Mixture: A physical blend of two or more different substances that are not chemically combined.
6. Solution: A homogeneous mixture where one substance (the solute) is dissolved in another (the solvent).
7. Heterogeneous mixture: A mixture in which the components are not uniformly distributed and can often be seen as separate phases.
8. Homogeneous mixture: A mixture in which the components are uniformly distributed throughout, appearing as a single phase.

Solution to the Questions Section

The second section contains several short-answer questions that test understanding of these concepts:

Question 9: Describe the difference between an intensive property and an extensive property.
* An intensive property does not change when you take a smaller sample of the substance. For example, the color or density of gold is the same whether you have a small flake or a large bar. An extensive property does change based on the amount of matter. For example, the mass or volume of gold will be different for a small flake versus a large bar.

Question 10: What is the difference between a physical change and a chemical change?
* A physical change alters the form or appearance of a substance without changing its chemical composition. The original substance can usually be recovered. A chemical change results in the formation of one or more new substances with different chemical compositions and properties. This process is generally irreversible by simple physical means.

Question 11: What are some examples of properties?
* Examples of properties include:
* *Intensive:* Color, odor, density, melting point, boiling point, luster.
* *Extensive:* Mass, volume, length, weight.

Question 12: Explain how a pile of ashes has the same mass as the original log before it was burned. What is this law called? Why is this important?
* Although the log turns into ash and gases during burning, the total mass of all the products (ash, smoke, gases) is equal to the mass of the original log plus the oxygen from the air that reacted with it. This is because of the Law of Conservation of Mass, which states that mass is neither created nor destroyed in a chemical reaction. This law is fundamental to chemistry and physics because it allows scientists to predict the amounts of reactants needed and products formed in any chemical reaction, ensuring that equations are balanced.

By completing both sections, the student demonstrates a solid understanding of the fundamental concepts of matter, its properties, and the changes it undergoes.