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hjlf
3 years ago
12

29. All synthetic elements are...

Chemistry
1 answer:
lara31 [8.8K]3 years ago
6 0

Answer:

D

Explanation:

pretty sure it is D. useful in making plastics

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earth land assembling together to form single large landmass

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Saturns day is roughly 10 hours. it takes about 30 years for Saturn to return to the same point in space. How do saturns periods
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8 0
4 years ago
Calculate the mass of 12.044*10^23atom of carbon
Keith_Richards [23]

Answer: 24 gram is a final Answer.

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4 0
3 years ago
A compound is formed when 12.2 g Mg combines completely with 5.16 g N. What is the percent composition of this compound? Please
Viefleur [7K]
3Mg + N₂ → Mg₃N₂
n(Mg) = 12,2g÷24,4g/mol = 0,5mol - limiting reagente.
n(N₂) = 5,16g÷28g/mol = 0,18mol
n(Mg₃N₂):n(Mg) = 1:3, n(Mg₃N₂) = 0,166mol
m(Mg₃N₂) = 0,166mol·101,2g/mol = 16,8g.
%(N)= 2·Ar(N)÷Mr(Mg₃N₂) = 2·14÷101,2 = 27,66% = 0,2766
%(Mg) = 3·Ar(Mg)÷Mr(Mg₃N₂) = 3·24,4÷101,2 = 72,34%
              or 100% - 27,66% = 72,34%.
7 0
4 years ago
Would you classify the atoms in the table as pure substances?
ivann1987 [24]

Answer:

Yes

Explanation:

Atoms are generally classified as pure substances. A pure substance has the following properties:

  • All parts are the same throughout i.e. homogeneous
  • They have definite composition
  • The cannot easily be broken down into simpler substances by physical means.
  • Separation by physical methods is not easy.
  • They have unique sets of physical properties.

Elements and compounds are generally classified as pure substances. Since atoms are the building blocks of pure substances, they can be classified as one.

3 0
3 years ago
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