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Understanding Matter: Properties and Changes - A Comprehensive Review

Explore the distinction between physical and chemical properties of matter, practical applications of plastic, differentiating physical and chemical changes, the significance of state changes, energy absorption and release, density calculations, and critical thinking on building a safe raft.

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Understanding Matter: Properties and Changes - A Comprehensive Review

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  1. Ch. 2: “Matter” Section 2.3 Review: “Properties of Matter”

  2. a. is shiny & silver physical b. melts easily physical c. burns in air chemical d. has a density of 2.3 g/cm3 physical e. tarnishes in moist air chemical 1. Classify the following as either chemical or physical properties:

  3. 2. Describe several uses for plastic, & explain why plastic is a good choice for these purposes. • Strong, rigid plastic can be used in cases for electronic devices, such as CD players. • Flexible, transparent plastic can be used as food wrap.

  4. a. ice melting in a drink physical b. sugar added to lemonade physical c. mixing vinegar & baking soda to generate bubbles chemical d. plants using CO2& H2O to form O2& sugar chemical 3. Classify the following as either a chemical or physical change:

  5. 4. Explain why changes of state are physical changes. • The composition of the substance does not change when it changes state.

  6. 5. Categorize the following as either absorbing or releasing energy. a. solid CO2going toCO2gas • absorbed b. rubbing alcohol evaporating • absorbed c. aluminum solidifying in a mold • released d. chocolate melting • absorbed

  7. 6. Calculate the density of a rock that has a mass of 454 g & a volume of exactly 100 cm3. • D = m/V • D = 454 g/100 cm3 • D = 4.54 g/cm3

  8. 7. Critical Thinking Q: You need to build a raft. Write a paragraph describing the physical & chemical properties of the raft that would be important to ensure your safety. You are not limited to the properties discussed in this chapter. A: Physical properties could include a density less than water, enough strength to not bend or break when a load is placed on it, & insolubility in water. Chemical properties could include not reacting with water or not burning.

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