Introduction to Chemical Reactions Answers
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?
Cherylanne mixes together Chemical A and Chemical B in a test tube, forming Chemical C. The mixture instantly turns cool to the touch. She then adds Chemical D, and the reaction becomes hot and explodes.
Which best describes what happens to the atoms in a chemical reaction?
Two chemicals react in an endothermic reaction. What can be known about this reaction?
When vinegar and baking soda react, the mixture becomes cold to the touch and a gas and a new liquid substance are formed.
Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction?
Which of these most likely represents a chemical change?
Pedro wants to create a chemical reaction between oil and water. He adds oil to a beaker of water and notices that the liquids do not mix. He then shakes the beaker and the drops of oil become suspended through the water for a few moments before returning to their separate layers.
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 is an example of a chemical reaction?
When baking soda and vinegar react, the surface bubbles. What does this most likely indicate?
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 of these most likely represents a chemical change?
When vinegar and baking soda react, the mixture becomes cold to the touch and a gas and a new liquid substance are formed.
Which is an example of a chemical reaction?
Reggie and Charlotte are baking oatmeal cookies. They dip the baked cookies in melted chocolate. The chocolate cools to form a hardened coating. Reggie argues the entire chocolate-covered cookie has undergone a chemical change. Charlotte disagrees, saying only the original oatmeal cookie has undergone a chemical change, not the chocolate coating.
Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction?
What must occur in order for a chemical reaction to be specifically classified as endothermic instead of exothermic?
Which is evidence that a chemical reaction has likely occurred?
For a science project, Janet performs four experiments that are supposed to show a chemical reaction. She displays her results in a table.
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