Answer:

A.

1.bc that mix with other powder

2.Gelatin is created by the breakdown of collagen, a protein used by all animals and plants to bind cells together: about 30 percent of your body weight is formed by the collagen in the extracellular matrix that holds your cells together. ... After much boiling and filtration, this gelatin can be extracted.

3.Making Jell-O is done when powdered gelatin (plus sugar and color) are added to and dissolved in boiling water.

B.

1.A hammer is a tool, most often a hand tool, consisting of a weighted "head" fixed to a long handle that is swung to deliver an impact to a small area of an object. This can be, for example, to drive nails into wood, to shape metal (as with a forge), or to crush rock.[1][2] Hammers are used for a wide range of driving, shaping, breaking and non-destructive striking applications. Traditional disciplines include carpentry, blacksmithing, warfare, and percussive musicianship (as with a gong).

2.Materials science has shaped the development of civilizations since the dawn of mankind. Better materials for tools and weapons has allowed mankind to spread and conquer, and advancements in material processing like steel and aluminum production continue to impact society today. Historians have regarded materials as such an important aspect of civilizations such that entire periods of time have defined by the predominant material used (Stone Age, Bronze Age, Iron Age). For most of recorded history, control of materials had been through alchemy or empirical means at best. The study and development of chemistry and physics assisted the study of materials, and eventually the interdisciplinary study of materials science emerged from the fusion of these studies.[1] The history of materials science is the study of how different materials were used and developed through the history of Earth and how those materials affected the culture of the peoples of the Earth. The term "Silicon Age" is sometimes used to refer to the modern period of history during the late 20th to early 21st centuries.

3. A chemical reaction occurs when a substance is rearranged to form a new substance

C.

1.The combustible material in a candle—or its fuel—is the wax. But before the wax can become fuel it first needs to get hot enough. ... Once the liquid wax gets hot enough, it then turns from a liquid into a gas. The hot gas then reacts with the oxygen from the air and is burned, creating the candle flame that we see.

2.If you could look down into the flame, you'd see that oxygen molecules from the air interact with wax molecules and have a chemical reaction. And the products of the reaction, that means the stuff that's produced, is water vapor, carbon dioxide gas, and heat, and light.

3.chemical change

When a candle burns, the oxygen in the air reacts and forms carbon dioxide. A new substance, the CO2 is formed. So it is a chemical change. When the candle melts, no new substance is formed and the molten wax can be again solidified and made into a candle and it is a reversible change.

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