Answer:
The California Condor is on the verge of extinction. There were three individuals, all males, known to be living free in late 1986. That was a drop from fifteen wild birds (including five breeding pairs) known to have been present in 1984. Twenty-one condors were also alive in captivity toward the end of 1986.
Explanation:
Probably, above 100 Degree Celsius.
Physical and chemical changes are the property of the reactions. The best observation evident of the chemical change is the deposition of the brown crust over the marshmallow.
<h3>What is a chemical change?</h3>
A chemical change is a change that results in the formation of a new substance that cannot be changed back into its original form. They are irreversible and include decomposition, combination, and addition reactions.
The color change of the marshmallow from white to brown shows the chemical change that cannot be reversed back to the original form while the melting of the candle and heating of the metallic fork are physical changes.
Therefore, the burning of marshmallows is a chemical change.
Learn more about chemical change here:
brainly.com/question/2268111
#SPJ4
Answer:
Acidic solution used to clean a crucible
Explanation:
This liquid dissolves alcoholic solvents such as crucible, that is why it was selected as the ideal for cleaning.
Although it would be ideal to know in detail which chemical compound is the one you want to clean so that the cleaning technique has better effectiveness.
