The reason responsible for the variation in atomic radii in group 3A,4A,5A,6A is increasing size of the nuclear charge.
As we move across the period in the periodic table, the size of the nuclear charge is increased because more protons are added but there is no increase in the number of shells.
As such, the outermost electrons experience greater attraction for the nucleus from left to right across the period.
This increased attraction causes the atoms to become smaller across the period.
Hence, across the period, the atomic radii of elements in groups 3A,4A,5A,6A decreases steadily.
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Answer:
4
Explanation:
Applying,
pH = 14-pOH.................... Equation 1
But,
pOH = -log(OH⁻)
Where OH⁻ = Hydroxyl ion concentration of NaOH.
From the question,
Given: OH⁻ = (1×10⁻¹⁰) M
Substitute these values into equation 1
pH = 14-log((1×10⁻¹⁰)
pH = 14-10
pH = 4
Hence the pH of NaOH with a molarity of 1.0 x 10-10M = 4
Answer : S) 33.2 °C
Explanation : When the equal amounts of gases are placed in identical containers but subjected to different temperatures would exert pressure in different amount which will in turn increase the rate of collision between the molecules of gas.
So, when the temperature is increased to maximum greater amount of force would be exerted and the gas molecules will collide with a larger force. Hence the answer will be as the highest temperature i.e. 33.2 °C
Answer:
The temperature remains constant. after the change occurs and temp remains the same
Explanation:
Remains constant because the phase change is absorbing the energy, after the phase change occurs it is then increasing in temperature again.
Answer:
1.125 moles of H2S
Explanation:
From 2HCl(aq) + ZnS(s) ---------> H2S (g) + ZnCl2 (aq)
From the reaction equation;
2 moles of HCl produces 1 mole of H2S
Therefore 2.25 moles of HCl will produce 2.25 ×1/2 = 1.125 moles of H2S
Recall that it was explicitly stated in the question that ZnS is the reactant in excess. This implies that HCl is the limiting reactant and controls the amount of product obtained.
