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UkoKoshka [18]
3 years ago
15

28. When charcoal burns, it undergoes a chemical change that produces heat and light. Besides the charcoal,

Chemistry
1 answer:
Sophie [7]3 years ago
8 0
The answer is going to be (a) - oxygen. this is because, for this reaction, charcoal undergoes a combustion reaction, using the oxygen from the surrounding atmosphere to burn to heat, light and CO2.
hope this helps!!
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The isotope of an atom containing 31 protons and 39 neutrons suddenly has two neutrons added to it.
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Answer:

Gallium-72

Explanation:

The elements are identified by the number of protons of the atom, which is its atomic number.

In this case the number of protons 39 (atomic number 39) permit you to identify the element as gallium.

Now, to identify the isotope you tell the name of the element and add the mass number.

The mass number is the sum of the protons and the neutrons

In this case, the number of neutrons is the original 39 plus the 2 added suddenly, i.e. 39 + 2 = 41, so the mass number is 31 + 41 = 72

Therefore, the isotope is gallium - 72.

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