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Questions and Answers
Which of the following is NOT one of the observations that help determine whether a chemical reaction has taken place?
Which of the following is NOT one of the observations that help determine whether a chemical reaction has taken place?
- Change in taste (correct)
- Change in temperature
- Evolution of a gas
- Change in state
What is formed when magnesium ribbon burns with a dazzling white flame?
What is formed when magnesium ribbon burns with a dazzling white flame?
- Magnesium oxide (correct)
- Magnesium chloride
- Magnesium hydroxide
- Magnesium sulfide
Which observation is used in the text to determine if a chemical reaction has taken place when discussing the burning of magnesium ribbon?
Which observation is used in the text to determine if a chemical reaction has taken place when discussing the burning of magnesium ribbon?
- Evolution of a gas (correct)
- Change in volume
- Change in shape
- Change in mass
What causes food to change into digestible forms in our body?
What causes food to change into digestible forms in our body?
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Study Notes
Chemical Reaction Observations
- Change in color, odor, or temperature are observations that help determine if a chemical reaction has taken place
- Formation of a precipitate or release of gas are also indications of a chemical reaction
- Change in physical state is another observation that can indicate a chemical reaction has occurred
Magnesium Ribbon Reaction
- When magnesium ribbon burns, it produces a dazzling white flame and forms magnesium oxide
- The dazzle of the flame is an observation used to determine that a chemical reaction has taken place
Digestion in the Human Body
- Enzymes are biological molecules that cause food to change into digestible forms in the human body
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