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tangare [24]
2 years ago
12

An ion of calcium has a charge of 2+. The ion contains 18 electrons. How many protons does a neutral atom of calcium possess?

Chemistry
1 answer:
Elza [17]2 years ago
7 0

Answer:

Explanation:

The ion and the neutral atom both contain 20 protons. Generally the protons stay in the nucleus forever.

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Answer:

B. The temperature of the water when the food sample has finished burning completely.

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Calorimetry is the measurement of heat energy released or absorbed in a chemical  reaction. A calorimeter is used in calorimetry. The calorimeter operates on the Law of Conservation of Energy which states that energy is never created or destroyed but is transformed from one form to another or between objects.

In food calorimetry, the energy released when food is burned is measured by recording the rise in temperature of water in a calorimeter when a given mass of a food sample is burned completely.

Energy can be calculated using the formula: Q = mc ∆T

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The temperature of the water when the food sample has finished burning completely is taken as the final temperature of the water. The sample is allowed to smolder for sometime before recording the final  water temperature. This is because the water temperature will continue to rise after the  flame has gone out.

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This question is incomplete

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