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Sav [38]
3 years ago
9

the total energy value of a 100g cereal is 2000KJ. the boy requires 5500 KJ of energy per day. How many grams of cereal does he

need to eat in order to obtain this energy(assuming that he does not eat any other foods)?​
Biology
1 answer:
zvonat [6]3 years ago
4 0

Answer:

He need to eat 275 g

Explanation:

2000 = 100

5500 = 2000÷100= 20 = 5500÷20 = 275

He need to eat 275 g

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<span>ovaries
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All the wavelengths can not reach the earth's surface always.

Explanation:

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Answer:

chitin and murein

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7 0
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If an atom has 15 electrons, how many electrons are in the n=1 energy level?
IRISSAK [1]

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In the n=1 energy level, the atom has 2 electrons

Explanation:

Electrons orbit the nucleus of an atom in multiple rings (energy levels). The first ring of the electron can only hold 2 electrons. After that, electrons are added to the second ring. Excluding the first ring, all other rings can hold a maximum of 8 electrons.

For example, Oxygen is an atom with 6 electrons. The first energy level contains 2 electrons, and the second energy level contains 4 electrons. The second energy level has room for up to 4 more electrons.

In your example of an atom with 15 electrons, there would be 2 electrons in the first ring, 8 electrons in the second ring, and 5 electrons in the third and final ring.

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