Changes in Matter – Flashcards

Which statement describes a physical property of copper? A. It reacts with strong acids. B. It can be reshaped by a force. C. It ignites at high temperatures. D. It can combine with oxygen.

Which of these is an example of a physical change? A. sugar dissolving in warm water B. iron rusting in the presence of moist air C. wood burning in the presence of oxygen D. baking soda reacting with acid to form a gas

A geochemist examines a piece of metal that he found in the soil. He performs tests to identify the metal from its density, electrical conductivity, and melting point. Which statement best describes his investigation? A. He is determining physical properties that are sufficient to identify the metal. B. He is determining chemical properties that are sufficient to identify the metal. C. He is determining physical properties that are insufficient to identify the metal. D. He is determining chemical properties that are insufficient to identify the metal.

The table below shows the freezing points of four substances. The substances are placed in separate containers at room temperature, and each container is gradually cooled. Which of these substances will solidify before the temperature reaches 0°C? A. benzene B. water C. butane D. nitrogen

A student performs the following experiment. Step 1: She pours a colorless solution into a beaker that contains another colorless liquid. Yellow particles appear in the liquid. Step 2: She lets the yellow particles settle in the beaker and then separates the colorless liquid by decantation. What has most likely occurred in the beaker? A. a chemical change in step 1 and a physical change in step 2 B. a physical change in step 1 and a chemical change in step 2 C. chemical changes in both step 1 and step 2 D. physical changes in both step 1 and step 2

A student investigated some properties of lead and recorded the findings in the table below. Which statement is true with respect to the investigation? A. The student investigated only the physical properties of lead. B. The student investigated only the chemical properties of lead. C. The student investigated more physical properties than chemical properties of lead. D. The student investigated more chemical properties than physical properties of lead.

Which is an intensive property of a substance? A. density B. volume C. length D. mass

Which term refers to a property that depends only on the amount of a substance? A. flammability B. extensive C. intensive D. reactivity

(Maybe) A scientist observes that the electrical resistance of a superconducting material drops to zero when the material is cooled to very low temperatures. Which of the following statements best describes what the scientist is observing? A. The scientist is observing the electrical power of a superconductor. B. The scientist is observing the temperature of a superconductor. C. The scientist is observing an intensive property of a superconductor. D. The scientist is observing an extensive property of a superconductor.

Which procedure could a student use to examine an intensive property of a rectangular block of wood? A. Find the mass. B. Record the length. C. Measure the volume. D. Determine the density.