A model showing that gases are made from the matter of particles that are too small to see and are moving freely around in space can explain many observations.
Answer:
The unknown amount of potassium chloride is 13.6 grams.
Explanation:
The reaction of 14 grams of KNO₃ with KCl produces a total mass of 27.6 grams of the products.
The law of conservation of mass tells us that the total mass of the reactants must be the same that the total mass of the products. So, we can find the mass of KCl as follows:

Where <em>r</em> is for reactants and <em>p </em>is for products



Therefore, the unknown amount of potassium chloride is 13.6 grams.
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Answer: Endothermic reaction.
Explanation: A chemical reaction in which energy is absorbed from the surrounding environment.
The Earth rotates 365 times during each complete revolution.
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B and c are the correct answers