Group 12 Elements have two valence electrons while Group 13 Elements have three valence electrons.
Number of valence electrons tend to determine factors like reactivity. So elements with different number of valence electrons will have different properties.
That is why G12 and G13 have different properties
Answer:
7.51 × 10¹⁷
Explanation:
1. Calculate the <em>energy of one photon</em>
The formula for the energy of a photon is
E = hc/λ
h = 6.626 × 10⁻³⁴ J·s; c = 2.998 × 10⁸ m·s⁻¹
λ = 531 nm = 531 × 10⁻⁹ m Insert the values
E = (6.626 × 10⁻³⁴ × 2.998× 10⁸)/(531 × 10⁻⁹)
E = 3.741× 10⁻¹⁹ J
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2. Calculate the number of photons
Divide the total energy by the energy of one photon.
No. of photons = 0.281 × 1/3.741 × 10⁻¹⁹
No. of photons = 7.51 × 10¹⁷ photons
Answer:
pH range of indicator is 5.4 to 7.4
Explanation:
An acid-base indicator are chemical substances that change in color when pH changes.
An indicator changes in color when the pH of the solution is equal to pKa of the indicator (Where pKa is defined as - log Ka).
<em>The pH range in which indicator changes in color is pKa ± 1.</em>
<em />
pKa of buffer is:
- log 4x10⁻⁷ = <em>6.4</em>
That means pH range of indicator is since 6.4 - 1 = <em>5.4</em> to 6.4 + 1 =<em> 7.4</em>.
<em>(5.4 - 7.4)</em>
Answer:
It is called Convection. Hope this helps!!!
To calculate the new pressure, we need to relate pressure with the temperature and the volume of the system. For simplification, we assume that it is an ideal gas so we use the equation PV = nRT where nR is a constant term. We calculate as follows:
P1V1/T1 = P2V2/T2
800(5.0) / 223.15 = P2 (7.0)/310.15
P2 = 794.21 mmHg