I think it's Chlorine but, not 100% sure. so C.
Answer:
Protons= Positive charge
neutrons= neutral charge
electrons= negative charge
Protons and neutrons make up nucleus
Electron travels around the nucleus
Explanation:
Answer:
1.28 × 10²² atoms
Step-by-step explanation:
A common formula for determining the amount of sample remaining (N) in terms of its half-life (t_½) is
N =N₀(½)ⁿ
where n is the number of half-lives
n = t/t_½
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Data:
N₀ = 6.02 × 10²³ atoms
t = 20 da
t_½ = 3.6 da
=====
The calculation:
N₀ =6.02 × 10²³ atoms
n = 20/3.6
n= 5.56
N = 6.02 × 10²³ × (½)^5.56
N = 6.02 × 10²³ × 0.0212
N = 1.28 × 10²² atoms
The balanced equation for the neutralisation reaction is as follows
2NaOH + H₂SO₄ ---> Na₂SO₄ + 2H₂O
stoichiometry of NaOH to H₂SO₄ is 2:1
the number of moles of NaOH reacted - 0.126 mol/L x 0.0173 L = 0.00218 mol
if 2 mol of NaOH reacts with 1 mol of H₂SO₄
then 0.00218 mol of NaOH reacts with - 0.00218 / 2 = 0.00109 mol of H₂SO₄
molarity is the number of moles of solute in 1 L solution
therefore if 25 mL contains - 0.00109 mol
then 1000 mL contains - 0.00109 mol / 25 mL x 1000 mL = 0.0436 mol/L
therefore molarity of H₂SO₄ is 0.0436 M
The viscosity can be measured in viscosity lab indirectly by measuring the distance a liquid flowed in a given time.
Answer: Option B
<u>Explanation:</u>
Viscosity is the measure of drift velocity of any fluid. So depending upon viscosity, the thickness or the density of the fluid can be understood. A fluid with high density will be highly viscous in nature and so that fluid will be flowing slowly.
In lab, we can measure the viscosity by measuring the distance a liquid flowed in a given time. If the viscosity of fluid is high, then that fluid will be taking more time to cross the given distance. And if the fluid is having less viscosity then, the liquid will be flowed easily.