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sasho [114]
3 years ago
10

Which of the following is not radiation ? A. baking in a metal pan in the oven , B. heat from a fire , C. microwaving food , or

D. suns rays

Chemistry
2 answers:
Dmitrij [34]3 years ago
7 0

Answer:

A. because it is conduction the transfer of heat through touching solids. Microwaving is wrong because rays of heat warm up the food. Radiation is the transfer through rays/gases.

Explanation:

IRISSAK [1]3 years ago
5 0

Answer:

C.

Explanation:

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2 years ago
How many neutrons does element X have if its atomic number is 30 and its mass number is 70?
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We can solve this by finding out the number of protons, and neutrons. Atomic number of an element means the number of protons in that element. So, the atom has 30 protons if the atomic number is 30.

On the other hand, mass number is the total number of protons and neutrons, but not electrons, because they're too light comparing to the other 2. Therefore, we can simply solve the number of neutrons in the atom by subtracting the number of protons from the mass number. 70 - 30 = 40.

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3 years ago
How many moles are in 9.8 grams of calcium?
kondor19780726 [428]
<span>when the number of moles Ca = mass of Ca / molar mass of Ca.

and we can get the molar mass of Ca, it is = 40 g/mol

and we have already the mass of Ca (given) = 9.8 g

so, by substitution: the moles Ca = 9.8 g / 40 g/mol

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4 0
3 years ago
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Which of the following statements correctly describes what happens in all chemical reactions?
azamat

Answer:

Bonds between atoms are broken/ or new bonds are formed

Explanation:

Due to chemical changes.

4 0
2 years ago
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