During an experiment, mr. lehman tells his students to be alert for signs that an endothermic reaction is happening. which of the following scenarios would his students most likely observe? a test tube becomes cool to the touch. a liquid appears to glow. a new odor comes from a beaker. a solid forms from a mixture of solutions.
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Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.
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Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous
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Which of these features are formed when hot groundwater is forced out through cracks in the earth's surface?
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During an experiment, mr. lehman tells his students to be alert for signs that an endothermic reacti...
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