DOL: 6.6E Evidence of Chemical Reactions (1)

A student places aluminum foil in the drain cleaner and observes rapid bubble formation. The foil gradually disappears. Analyze the relationship between the observed changes and the evidence of a new substance forming.

• A. The bubbles are air escaping from the dissolving foil.

• B. The drain cleaner is boiling due to a reaction with the foil.

• C. A gas is being produced as the foil reacts with the drain cleaner.

• D. The foil is changing state from solid to gas.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

2. During a cooking demonstration, a chef makes the following observations.
   Select ALL that provide strong evidence of a chemical change occurring.

3. 
   A. Water boiling in a pot.

4. B. Sugar caramelizing and turning brown.

5. C. An egg is cracked in half.

6. D. Oil and vinegar are separated in a salad dressing.

7. E. Baking soda reacting with vinegar in a cake batter.

• A & C

• B & E

• D & E

• A & D

• B & C

Tags

NGSS.MS-PS1-2

A group of students is given this illustration. Based on the evidence in the illustration, what can students conclude?

• A. Production of a gas indicates a chemical change occurred.

• B. There was no chemical change.

• C. A precipitate has formed.

• D. There was a physical change that occurred only.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Students conducted an investigation in which they added four different white, solid, powdery substances to separate beakers of water and recorded their observations in the table.

Which substances most likely caused a new substance to be formed when mixed with the water?

• A. Substance 1

• B. Substance 2

• C. Substance 3

• D. Substance 4

Tags

NGSS.MS-PS1-2

A student mixes baking soda and vinegar in a balloon.
What type of change is occurring in this experiment?

• Chemical Change; the inflation of the balloon indicates the production of a precipitate

• Chemical Change; the inflation of the balloon indicates the production of a gas

• Physical Change; the inflation of a balloon indicates a change in states of matter

• Physical Change; the inflation of the balloon indicates a change in color

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5