It’s the process of detecting a change of a objects position relative to its surroundings
In Thomson's cathode-ray experiment,<span>He sucked all of the air out of the tube, so only the ray was inside. He then concluded that the ray was negatively charged because the ray came from the cathode ray and went to the positively charged anode ray, so the cathode had to be negative or else it would have deflected away from the anode.
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Answer:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
190.14 mL of the NaOH solution would be required.
Explanation:
The balanced reaction is:
- 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
Now we <u>calculate how many H₂SO₄ moles are there in 25.00 mL of a 5.400 M solution</u>, using the <em>definition of molarity</em>:
- Molarity = moles / liters
- Moles = Molarity * liters
- 25.00 mL * 5.400 M = 135 mmol H₂SO₄
Now we <u>convert H₂SO₄ moles into NaOH moles</u>, using the <em>stoichiometric coefficients of the balanced reaction</em>:
- 135 mmol H₂SO₄ * = 270 mmol NaOH
Finally we <u>calculate the volume of a 1.420 M solution that would contain 270 mmoles</u>:
- Molarity = moles / liters
- liters = moles / molarity
- 270 mmol / 1.420 M = 190.14 mL
Answer:
[KI] = 0.17 M
Explanation:
We determine the moles of solute:
Mass / Molar mass → 4.73 g / 166 g/mol = 0.0285 moles
Molarity (mol/L) is defined as moles of solute in 1L of solution
It is a sort of concentration
M = 0.0285 mol / 0.169L = 0.17 M
Instead of making the division (mol/L), we can also try this rule of three:
In 0.169 L we have 0.0285 moles of solute
in 1 L we must have ___ (1 . 0.0285) / 0.169 = 0.17 mol/L