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Nat2105 [25]
3 years ago
11

Which group/family contains elements with the smallest radius within the same period?

Chemistry
1 answer:
nasty-shy [4]3 years ago
5 0

Answer:

Halogens

Explanation:

From the given choices, the halogens will have the smallest radius within the same period.

The size of an atom is estimated by the atomic radius. This is taken as half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state.

  • Across a period in the periodic table, atomic radii decrease progressively from left to right.
  • Down a group from top to bottom, atomic radii increase progressively due to the addition of successive shells.

Since halogen is the right most group from the choices given, it will have the smallest radius.

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Acid-base neutralization means having a pH of 7. true or false ?
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Answer:

True

Explanation:

A pH of 7 is greater than basic but lesser than acidic. Therefore, it's neutral

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The half life for the radioactive decay of rubidium-87 to strontium-87 is 4.88 × 10 years. Suppose nuclear chemical analysis sho
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Answer:

Most igneous, metamorphic, and sedimentary rocks contain rubidium (Rb) and strontium (Sr) in detectable amounts. However, the concentrations of these elements are almost always less than 1 percent, and they are therefore rarely determined in routine chemical analyses. Neither rubidium nor strontium is a major constituent in the common rock-forming silicate minerals, although strontium does form a carbonate (strontianite) and a sulfate (celestite) which are found in some hydrothermal deposits and certain sedimentary rocks, particularly carbonates.

Explanation:

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3 years ago
The Arrhenius equation shows the relationship between the rate constant k and the temperature T in kelvins and is typically writ
Alex17521 [72]

Answer:

T = 42.08  °C

Explanation:

Using the expression,

\ln \dfrac{k_{1}}{k_{2}} =-\dfrac{E_{a}}{R} \left (\dfrac{1}{T_1}-\dfrac{1}{T_2} \right )

Wherem  

k_1\ is\ the\ rate\ constant\ at\ T_1

k_2\ is\ the\ rate\ constant\ at\ T_2

E_a is the activation energy

R is Gas constant having value = 8.314 J / K mol

Thus, given that, E_a = 45.6 kJ/mol = 45600 J/mol (As 1 kJ = 1000 J)

k_2=2\times k_1

k_1=0.0160s^{-1}

T_1=30\ ^0C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

So,  

T = (30 + 273.15) K = 303.15 K  

T_1=303.15\ K

So,

\ln \dfrac{k_{1}}{2\times k_{1}} =-\dfrac{45600}{8.314} \left (\dfrac{1}{303.15}-\dfrac{1}{T_2} \right )

\ln \dfrac{1}{2} =-\dfrac{45600}{8.314} \left (\dfrac{1}{303.15}-\dfrac{1}{T_2} \right )

8.314\ln \left(2\right)=-45600\left(\frac{1}{303.15}-\frac{1}{T_2}\right)

8.314\ln \left(2\right)=-150.42058+\frac{45600}{T_2}

144.65775 =\frac{45600}{T_2}

T_2=\frac{45600}{144.65775}

T_2=315.23\ K

Conversion to °C as:

T(K) = T( °C) + 273.15  

So,  

315.23 = T( °C) + 273.15

<u>T = 42.08  °C</u>

3 0
3 years ago
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