Stirring dry yeast into a bowl of hydrogen peroxide causes bubbles to form. Blowing air into a glass of milk with a straw also causes bubbles to form. One of these is a physical change, and the other is a chemical change. How could you determine which type of change is occurring in each situation?
Answers
"If the reaction is a compound change or any chemical change, new substances with various identities and properties will be formed. This might be shown by the creation of a smell, an adjustment in energy or color, or the formation of solid."
The yeast and H2O2 is the chemical change, since when something is changed artificially, there is a substance included that can't be removed to influence it to return to its original state. Anyway when we're blowing bubble in milk, no synthetics or chemicals were included and it will return to it's unique state.
Answer:
Sample Response: If the reaction is a chemical change, new substances with different properties and identities are formed. This may be indicated by the production of an odor, a change in color or energy, or the formation of a solid.
Explanation:
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