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2 years ago

9

Why do elements in the same group have similar chemical properties?

1 answer:

Sidana [21]2 years ago

4 0

Because their atoms have the same number of electron in the highest occupied level.

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What percentage of radioactive substance remains after two half-lives

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Answer:

After 2 half-lives there will be 25% of the original isotope, and 75% of the decay product. After 3 half-lives there will be 12.5% of the original isotope, and 87.5% of the decay product. After 4 half-lives there will be 6.25% of the original isotope, and 93.75% of the decay product.

Explanation:

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2 years ago

True or False. Electromagnetic waves travel fastest through a vacuum. Question 2 options: True False

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3 years ago

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5. __NH3 + __O2 >>>>>__ NO +__ H20

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2 NH3+ 2 O2 —> 2 NO+ 3 H2O

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3 years ago

Iron has a density of 7.86 g/cm3. Calculate the volume (in dL) of a piece of iron having a mass of 4.07 kg . Note that the densi

elena-s [515]

Answer:

The volume of the piece of iron is 5.18dL.

Explanation:

The density (ρ) is equal to the mass (m) divided the volume (V).

$\rho = \frac{m}{V}$

If we rearrange it, we have:

$V=\frac{m}{\rho }$

To express the volume in dL we will need the following relations:

1 dL = 0.1 L
1 kg = 10³ g
1 cm³ = 1 mL
1mL = 10⁻³L

Then,

$\rho = \frac{7.86g}{cm^{3} } .\frac{1cm^{3} }{1mL} .\frac{1mL}{10^{-3}L } .\frac{1kg}{10^{3}g } =7.86kg/L$

Finally,

$V=\frac{m}{\rho }=\frac{4.07kg}{7.86 kg/L} =0.518L.\frac{1dL}{0.1L} =5.18dL$

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Explanation: Hope this helps

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2 years ago

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