Answer: C: Bubbles form E: There is a change in color.
Explanation:
A chemical reaction is characterized by a transformation in chemical structure, resulting in the formation of a new substance.
Example: The rusting of iron to form ferric oxide is an example of a chemical transformation.
In this case, iron, initially grey, transitions to green and ultimately turns a reddish-brown hue.
Features of a chemical reaction include:
1. color change
2. absorption or release of heat
3. gas production
4. the emergence of a precipitate
This means that when food left unrefrigerated undergoes color changes and gas production, it signifies a chemical change.
Answer:
Explanation:
Within a duration of 60 seconds, six waves are observed.
With a total of 6 waves,
this equates to 3 wavelengths.
As a result,
the period for each wavelength is calculated as 60 divided by 3.
Thus, period = 20 seconds.
According to the frequency-period relationship,
f = 1 / T
f = 1 / 20
f = 0.05 Hz
Response:
Clarification:
We need an expression that shows how much water has been drained from the tub. This is represented by v, which indicates how many gallons have flowed out since the plug was taken out. Each gallon removed equates to 8.345 pounds of water, so the weight of the drained water Q in pounds as a function of v can be expressed as:
Where v signifies the number of gallons emptied from the tub.
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