The correct answer is indeed Arsenic (As). This is the element that fits the description of being in period 4 and group 5, just like Krypton and Nitrogen.
<h3>
Answer:</h3><h3>a) 9.033 × 10²³ particles</h3><h3>b) 4.068 × 10²⁴ particles</h3><h3>c) 1.51 × 10²³ particles</h3>
Explanation:
For us to answer these questions, we have to know two formulas:
- Number of particles = moles × Avogadro's Number
- Moles = Mass ÷ Molar Mass
Therefore:
a) particles of Na = 1.50 mol × (6.022 × 10²³) particles/mol
= 9.033 × 10²³ particles
b) particles of Pb = 6.755 mol × (6.022 × 10²³) particles/mol
= 4.068 × 10²⁴ particles
c) particles of Si
= (7.02 g ÷ 28.085 g/mol) × (6.022 × 10²³) particles/mol
= 1.51 × 10²³ particles
Answer:
It allows for easier division of the sister chromatids into two identical chromosomes, one for each cell, and helps to prevent mistakes. You just studied 2 terms!
Explanation:
Answer: 5m
Explanation:
Given that:
Wavelength (λ)= ?
Frequency of wave (F) = 60MHz
[If 1 MHz = 1,000,000 Hz
60MHz = 60 x 1,000,000 = 6 x 10^7Hz]
Speed of wave (V) = 3 x 10^8 m/s
The wavelength is the distance covered by the wave in one complete cycle. It is measured in metres, and represented by the symbol λ.
So, apply the formula V = F λ
Make λ the subject formula
λ = V/ F
λ = 3 x 10^8 m/s / 6 x 10^7Hz
λ = 5m
Thus, the wavelength of an electromagnetic wave is 5 metres.
