Laboratory Experiments and Observations

Questions

1. MultiChoice

   A student drops an effervescent tablet into water. Gas bubbles fizz rapidly. What kind of change is this?

2. MultiChoice

   A student heats blue copper sulfate crystals until they turn into white powder and steam forms. This is a:

3. MultiChoice

   If a lab experiment produces a strange smell and smoke, the student observed a:

4. MultiChoice

   A student mixes cornstarch and water to make oobleck. What kind of change is this?

5. MultiChoice

   A lab group measures the mass before and after an open baking soda and vinegar experiment and notices mass decreased. Why?

6. MultiChoice

   Testing the pH of lemon juice with litmus paper turns the paper red. This color test indicates a:

7. MultiChoice

   When iodine solution is dropped on a potato slice, it turns dark purple-black. This indicates a:

8. MultiChoice

   A student bends a paperclip back and forth until it breaks. What change took place?

9. WordsBox

   Mixing baking soda and vinegar produces ____ dioxide gas in a classic chemical ____

10. WordsBox

    Observing a cloudiness when combining two clear liquids signals a ____ formed during a chemical ____

11. WordsBox

    Measuring temperature changes with a ____ helps detect exothermic or endothermic ____

12. WordsBox

    Filtering sand from a salt solution demonstrates a ____ separation of a ____