SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sound is given off
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Gas bubbles escape
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The shape of the object changes
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The temperature changes
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Detailed explanation-1: -Color. The changing of color of a substance is not necessarily an indicator of a chemical change. For example, changing the color of a metal does not change its physical properties.
Detailed explanation-2: -Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Detailed explanation-3: -Potential signs that chemical reactions have occurred include a change in color, change in temperature, formation of a gas, and formation of a precipitate.
Detailed explanation-4: -Answer and Explanation: Color change and gas formation tell that another product is formed. Temperature change also indicates a chemical change because an exothermic reaction occurs, and heat is released by the reaction. Change in volume is a physical change.