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leonid [27]
3 years ago
6

Please help. thanks :)

Chemistry
2 answers:
Anastasy [175]3 years ago
7 0

Answer:

2H_{2}+O_{2}  ⇒  2H_{2}O is balanced.

Explanation:

  • In the first equation number of oxygen is not balanced
  • In the second equation number of hydrogen is not balanced
  • In the third equation one oxygen is extra in RHS
  • The fourth equation is the balanced one.

sleet_krkn [62]3 years ago
6 0

The correct answer would be equation 4, because there are 4 Hydrogens and 2 Oxygens on each side of the equation making it balanced.

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Explanation:

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3 years ago
A cube of an unknown metal measures 0.200 cm on one side. The mass of the cube is 52 mg. Which of the following is most likely t
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Answer:

Option E. Zirconium

Explanation:

From the question given above, the following data were obtained:

Length of side (L) of cube = 0.2 cm

Mass (m) of cube = 52 mg

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Length of side (L) of cube = 0.2 cm

Volume (V) of the cube =?

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V = 0.2³

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Next, we shall convert 52 mg to g. This can be obtained as follow:

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Therefore,

52 mg = 52 mg × 1 g / 1000 mg

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Thus, 52 mg is equivalent to 0.052 g.

Next, we shall determine the density of the unknown metal. This can be obtained as follow:

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Comparing the density of the unknown metal i.e 6.5 g/cm³ with those given in table in the above, we can conclude that the unknown metal is zirconium

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konstantin123 [22]
The awnser is D or the 4th one
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Komok [63]

Answer:

This molecule is AgN3

Explanation:

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