Physical & Chemical Changes quiz #4 Flashcards
Physical & Chemical Changes quiz #4
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When water evaporates, what type of change occurs? Evaporation is a physical change. What happens to water when it evaporates? Water changes from liquid to gas, but its chemical composition remains unchanged. How do particles differ after a chemical change? Particles rearrange to form new substances with different chemical properties. What kind of change is boiling water for soup? Boiling water is a physical change. An atom loses an electron to another atom. Is this an example of a physical or chemical change? This is a chemical change. Which of the following processes does not involve a change in chemical properties? Melting ice does not involve a change in chemical properties. Which of the following can indicate that a chemical change has occurred? Formation of a precipitate can indicate a chemical change. How do you know that a chemical change has occurred? By observing formation of new substances or changes in color, gas, temperature, precipitate, or odor. What are some signs that a chemical reaction might have occurred? Color change, gas production, temperature change, precipitate formation, and odor change. Which observation would indicate that a chemical reaction occurred? Production of a gas or color change. Which are signs that a chemical change might have happened? Color change, gas production, temperature change, precipitate formation, and odor change. Which is not a sign that tells you if a chemical reaction has occurred? Change in shape is not a sign of a chemical reaction. How can you tell when a chemical reaction has occurred? By observing formation of new substances or changes in color, gas, temperature, precipitate, or odor. What kind of change is burning sugar? Burning sugar is a chemical change. Which statement describes one of the main differences between a physical and a chemical change? A chemical change forms new substances; a physical change does not. Which of the following accurately describes vaporization? Vaporization is the process where a liquid changes to a gas. How can you tell a chemical reaction or change has taken place? By observing formation of new substances or changes in color, gas, temperature, precipitate, or odor. Is this a physical change or a chemical change: a campfire? A campfire is a chemical change. What is the difference between a physical property and a chemical property? Physical properties can be observed without changing composition; chemical properties describe how a substance reacts to form new substances. Which observation most likely indicates that only a chemical change has taken place? Formation of a new substance most likely indicates a chemical change. What is not a possible sign of a chemical change? Change in size is not a possible sign of a chemical change. Which of the following is an example of physical change? Melting ice is an example of a physical change. The melting of an ice cube is an example of what kind of reaction? It is an example of a physical change. Which of the following is not a sign of chemical change? Change in shape is not a sign of chemical change. Which of the following is not a possible sign of a chemical change? Change in physical state is not a possible sign of a chemical change. What happens when a solid melts? The solid changes to a liquid, but its chemical composition remains the same. Which change of state takes place when a gas loses energy? Condensation or deposition occurs when a gas loses energy. What is the main difference between physical properties and chemical properties? Physical properties can be observed without changing composition; chemical properties involve changes in composition. Why is melting an ice cube a reversible physical change? Because the process can be reversed by refreezing the water. How is ice melting different from burning something? Ice melting is a physical change; burning is a chemical change that forms new substances. How do you know if a chemical reaction has occurred? By observing formation of new substances or changes in color, gas, temperature, precipitate, or odor. Which of these is a chemical change? Cooking an egg is a chemical change. Why is ice melting not a chemical change? Because the chemical composition of water does not change. Which is not an example of a chemical change? Boiling water is not a chemical change. Which is an example of chemical change? Burning wood is an example of chemical change. What type of change forms a new substance? A chemical change forms a new substance. How can you determine if a physical or chemical change has occurred? Check if the substance's chemical identity has changed; if so, it's chemical; if not, it's physical. How can a chemical change be reversed? Most chemical changes cannot be reversed under normal conditions. What happens to the salt during evaporation? Salt remains as a residue after water evaporates. Which is the process by which a solid changes to a liquid? Melting is the process by which a solid changes to a liquid.
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