Answer:
--Acid is the substance when dissolved in water, increases the concentration of H+ ions.
--Such compound whose chemical formula begins with H, for example HCl (Hydrochloric acid), H3BO3 (Boric acid), CH2O3 (Carbonic
acid). Although CH3COOH (Acetic acid) is an exception.
--Its less than 7.
--Bases are the proton acceptor.
--Such compounds whose chemical formula ends with OH, for example KOH (Potassium hydroxide), NaOH (Sodium hydroxide).
--Its greater than 7.
Explanation:
Answer: The molarity of is 0.07 M
Explanation:
According to the neutralization law,
where,
= basicity = 1
= molarity of solution = ?
= volume of solution = 25.0 ml
= acidity of = 1
= molarity of solution = 0.1000 M
= volume of solution = 17.5 ml
Putting in the values we get:
Therefore, molarity of is 0.07 M
Materials are transferred between individual cells and their internal environment through the cell membrane by diffusion, osmosis, and active transport. During diffusion and osmosis, molecules move from a higher concentration to a lower concentration. Osmosis: Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. This would be the diffusion.
From the calculations, we can see that the half life of the material is 11.4 days
<h3>What is radioactivity?</h3>
The term radioactivity refers to the spontaneous disintegration of a radioactive nucleus. The time taken for half of the radioactive material to remain.
Given that;
N/No = (1/2)^t/t1/2
N = amount that remained
No = amount that remained in the beginning
t = time taken
t1/2 = half life of the substance
N =Noe^-kt
4.995 ×10^9 = 1.75 x 10^12e^-55k
3.5* 10-2=e^-55k
k = ln3.5* 10-2/-55
k =0.06095
t1/2 = 0.693/0.06095
t1/2 = 11.4 days
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The energy of an electromagnetic wave that has a wavelength of 4.2nm is 4.731 × 10-¹⁷ J.
<h3>How to calculate energy of a wave?</h3>
The energy of a wave can be calculated using the following formula:
E = hf
Where;
- E = energy
- h = Planck's constant (6.626 × 10-³⁴J/s)
- f = frequency of the wave
However, the frequency must be calculated first as follows:
λ = v / f
Where;
- λ = wavelength
- v = speed of light (3 × 10⁸m/s)
4.2 × 10-⁹ = 3 × 10⁸/f
f = 7.14 × 10¹⁶Hz
Energy = 6.626 × 10-³⁴ × 7.14 × 10¹⁶
Energy of the wave = 4.731 × 10-¹⁷ J
Therefore, the energy of an electromagnetic wave that has a wavelength of 4.2nm is 4.731 × 10-¹⁷ J.
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