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- 1. Multiple Choice
Which lab experiments below describe a situation where a chemical change has occurred? Check all that apply.
After adding zinc (Zn) to hydrochloric acid (HCl), a student observes bubbles forming in the solution and a thermometer registers a change in temperature.
A student uses a mortar and pestle (a grinding stone) to break up large pieces of ammonium thiocyanate ( ) into smaller pieces.
After combining Unknown A (a solid, white crystal) with Unknown B (a clear, odorless liquid), there is a strong smell produced and a thermometer registers a change in temperature.
A student dissolves sugar ( ) into water ( ). The sugar crystals seem to disappear.
- 2. Multiple Choice
A scientist spilled a few drops of dilute hydrochloric acid (HCl) on a lab table. For safety purposes, the scientist sprinkled some baking soda ( ) onto the spill. Which observation would provide the best evidence that a chemical reaction occured?
The baking soda and hydrochloric acid combined, and bubbles formed.
The baking soda absorbed the hydrochloric acid.
Some of the baking soda dissolved in the hydochloric acid.
The hydrochloric acid evaporated, leaving only the baking soda.
- 3. Multiple Choice
What key words, when present in a question about chemical reactions, might indicate a chemical change is occuring? Check all that apply.
Bubbling
Fizzing
Dissolving
Evaporating
- 4. Multiple Choice
A student combines two clear, colorless solutions shown here. When combined, the temperature changed from to and a white substance rapidly formed and settled at the bottom of the container. What most likely happened to produce these results?
One of the original compounds came out of solution
The solutions reacted chemically
Some of the water froze into ice crystals
Rapid evaporation of water occured, leaving a solid
- 5. Multiple Choice
Which of the following does NOT indicate a chemical reaction is occuring? Check all that apply.
Unknown A dissolves into Unknown B
Unknown A creates fizzing and bubbles when combined with Unknown B
Unknown A sinks to the bottom when added to Unknown B
Unknown A floats to the top when added to Unknown B
- 6. Multiple Choice
Which scientific observation, shown in the chart, indicates that a chemical reaction has NOT occurred?
Number 1
Number 2
Number 3
Number 4
- 7. Multiple Choice
Carbon dioxide ( ) forms when coal burns in the presence of oxygen. Which of these is the BEST evidence that a chemical reaction occurs when coal burns?
The shape of the coal changes
Oxygen is present
A new substance is produced
Coal is made up of more than one element
- 8. Multiple Choice
What evidence can you use to infer that a chemical reaction has occurred here?
A dark solid formed on the zinc metal
The zinc metal remained silver-colored and shiny
The solution turned blue when the zinc metal was added
None of these
- 9. Multiple Choice
Observe the chemical equation shown here. What evidence of a chemical reaction is present when 2NO is added to ?
A gas is present
The total number of atoms remains unchanged
The state of matter remains the same
A brown gas is produced
- 10. Multiple Choice
Review the data in the chart provided. Which statement below is NOT supported by this data?
A chemical reaction takes place between magnesium and hydrochloric acid.
A gas is released in Test Tube 2.
The substances in both test tubes are reactive.
Energy is released in Test Tube 2.
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