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Evgesh-ka [11]
3 years ago
8

Which group on the periodic table are the last reactive? A alkali metals B alkaline earth metals C halogens D noble gases

Chemistry
1 answer:
alexgriva [62]3 years ago
8 0
<h3>Answer:</h3>

D. Noble gases

<h3>Explanation:</h3>
  • Noble gases are elements in the last group of the periodic table.

Why are they the least reactive elements?

  • Noble gases have an octet configuration, which means they have maximum number of electrons in their outermost energy levels.
  • This makes them stable, which means they are inert.
  • Examples of noble gases include neon, argon, krypton, etc.

What is the Trend in reactivity in the periodic table?

Down the group from top to bottom

  • The reactivity of metals in the periodic table increases down the group due the increase in the number of energy levels which makes it easier for them to lose electron(s).
  • Non-metals react by gaining electron(s), therefore, their reactivity decreases down the group because as the energy level increases the nuclear charge decreases.

Across the period from left to right.

  • Reactivity of metals decreases across the period because of an increase in nuclear charge which makes it more difficult for them to lose electron(s).
  • On the other hand, reactivity of non-metals increases across the period due to increased nuclear charge that makes it easier for them to gain electron(s).
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                     HNO3 --> H⁺  + NO₃⁻

Hence, the ions are H⁺, NO₃⁻. 
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Adding hydrogen atoms to an unsaturated fatty acid will make it __________.
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\text{g}&=\frac{\text{G}\frac{\text{M}}{2}}{\text{R}^{2} }}

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Barium sulfate is made by the following reaction.
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Answer:

                      %age Yield =   96 %

Explanation:

                    The balance chemical equation for given double replacement reaction is,

                      Ba(NO₃)₂ + Na₂SO₄ → BaSO₄ + 2 NaNO₃

Step 1: <u>Calculate moles of Ba(NO₃)₂:</u>

Moles  =  Mass / M.Mass

Moles  =  75.1 g / 261.33 g/mol

Moles  =  0.2873 moles of Ba(NO₃)₂

Step 2: <u>Find out moles of BaSO₄ formed:</u>

According to balance chemical equation,

                  1 mole of Ba(NO₃)₂ produced  =  1 mole of BaSO₄

So,

        0.2873 moles of Ba(NO₃)₂ will produce  =  X moles of BaSO₄

Solving for X,

                      X =  0.2873 mol × 1 mol / 1 mol

                       X =  0.2873 moles of BaSO₄

Step 3: Calculate Theoretical Mass of BaSO₄:

Mass  =  Moles × M.Mass

Mass  =  0.2873 mol × 233.38 g/mol

Mass  = 67.07 g of BaSO₄

Step 4: <u>Calculate %age Yield as:</u>

                 Theoretical Yield  =  67.07 g

                  Actual Yield  =  64.4 g

                  %age Yield  =  <u>???</u>

Formula Used:

                   %age Yield  =  (Actual Yield ÷ Theoretical Yield) × 100

Putting Values,

                   %age Yield  =  (64.4 g ÷ 67.07 g) × 100

                   %age Yield =  96.01 % ≈ 96 %

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