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- 1. Multiple Choice
Which of the following is a sign that a chemical reaction (or change) has occurred?
change in shape
melting
formation of a gas
dissolving
- 2. Multiple Choice
Is melting butter for popcorn a chemical or physical change?
chemical
physical
- 3. Multiple ChoiceIs burning wood a chemical or physical change?chemicalphysical
- 4. Multiple Choice
Which of the following is NOT an example of a physical change?
crumpled paper
dissolving sugar in water
freezing water
burning a marshmallow
- 5. Multiple ChoiceKim puts an ice cube in a beaker and it melts. This is a good example of:a physical change.a chemical change.an experiment.an analysis.
- 6. Multiple Choice
Kool-aid dissolving in water
physical change
chemical change
- 7. Multiple ChoicePut the liquids in order from most dense to least dense?4, 3, 2, 11, 2, 3, 43, 4, 2, 1,4, 3, 1, 2
- 8. Multiple ChoiceJack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?7 mL7 g/cm328 g/cm31/7 g/cm3
- 9. Multiple Choice
A student calculated the density of a liquid and found it to be 1.36 g/ml. What is the liquid?
baby oil
water with food coloring
honey
dark maple syrup
- 10. Multiple ChoiceA chemical change is different than a physical change because in a chemical changeChemicals are usedMolecules do not physically touchA new substance is formed and in a physical change no new substance is formedThe change can be seen but in a physical change it cannot
- 11. Multiple Choice
What is happening to the molecules of water in the chemical change: electrolysis?
Molecules get closer together and more packed
Molecules break apart and form new molecules (H and O gas)
The atoms in the molecules get bigger
Nothing happens to the molecules
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