Which statement best describes the difference between endothermic and exothermic reactions?
Two chemicals react in an endothermic reaction. What can be known about this reaction?
Which is an example of a chemical reaction?
Which best describes what is occurring in the reaction? When vinegar and baking soda react, the mixture becomes cold to the touch and a gas and a new liquid substance are formed.
When liquid silver nitrate and liquid sodium chloride are combined, solid silver chloride forms along with a new liquid, sodium nitrate. Which substance represents the precipitate?
Which is evidence that a chemical reaction has likely occurred?
When baking soda and vinegar react, the surface bubbles. What does this most likely indicate?
Which best describes what happens to the atoms in a chemical reaction?
What does this represent about the type of change happening in the container? Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes.
Which of these most likely represents a chemical change?
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