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- 1. Multiple Choice
A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles indicate the formation of a new substance because bubbles -
show that a gas is forming
always rise to the top of a liquid.
are almost always perfectly spherical.
usually burst after a few minutes.
- 2. Multiple Choice
Four students performed four different investigations by combining different substances. Their results are shown in the table provided. In which experiment are new substances being formed?Experiment 1Experiment 2Experiment 3Experiment 4 - 3. Multiple Choice
Which of the following is an example that includes evidence that a NEW substance was formed?
A sample of zinc is placed in water and it settles to the bottom
A solid block of ice is heated and it completely melts into a liquid.
Sugar that is burned gives off an odor and turns brown and then black.
A tomato is placed into a blender and chopped up into smaller pieces.
- 4. Multiple ChoiceIn a container, a solid consisting of clear crystals is combined with a blue liquid and the following observations are obtained.
How many of the listed observations indicate a new substance was formed?1234 - 5. Multiple Choice
For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.
The student inferred that a chemical reaction occurred. What evidence supports this inference from the picture?
A dark solid, rust, formed on the zinc metal.
The zinc metal remained silver-colored and shiny
The CuSO4 solution was blue when the zinc metal was added.
None of these are correct
- 6. Multiple Choice
Two clear, colorless solutions were combined.
The student observed that the temperature changed from 25 •C to 23 •C when the solutions were combined, and that a white substance rapidly formed and settled to 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 occurred, leaving a solid
- 7. Multiple Choice
A scientist performed four investigations using eight different liquids. In each investigation, the scientist combined two of the liquids and recorded observations in the table shown. In which investigation is it least likely that the liquids reacted chemically?
1
2
3
4
- 8. Multiple Choice
Copper pennies turning greenish after a few years is an example of a chemical change because...
The pennies' texture became different.
The pennies changed temperature.
The pennies changed colors as they tarnished.
This is NOT an example of a chemical change. It is a physical change.
- 9. Multiple ChoiceA physical change occurs in the digestive system when —gastric juices in the stomach convert proteins into amino acids.saliva change complex carbohydrates into simple sugars.teeth break down and grind food particles into smaller pieces.pancreatic enzymes change fats into fatty acids and glycerol.
- 10. Multiple Choice
Which of the following is an example of a chemical change during digestion?
Muscles in the esophagus move food toward the stomach.
Protein changes into amino acids in the stomach.
Water is absorbed into the blood stream in the large intestine.
Teeth tear and grind food in the mouth into smaller pieces.
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