Particles are moving from regions of high concentration to low concentration. Hence, option A is correct.
<h3>What is diffusion?</h3>
Diffusion is the movement of a substance from an area of high concentration to an area of lower concentration.
Diffusion results from the random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration.
This process can neither be stopped nor reversed. It occurs when the medium surrounding the cell has a higher water concentration than the cell.
Hence, option A is correct.
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Answer:
elements:4
Atoms:7
Explanation:
Elements: Na (Sodium), H (Hydrogen), C (Carbon), and O (Oxygen)
Atoms: 2*Na (Sodium), 1*H (Hydrogen), 1*C (Carbon), and O (Oxygen)*3
Answer:
1.46 moles NaCl
Explanation:
To find the moles of NaCl, you need to multiply the given value (0.731 moles BaCl₂) by the mole-to-mole ratio of the two relevant molecules. This ratio is made up of the coefficients in the balanced reaction. The numerator should contain moles NaCl to allow for the cancellation of moles BaCl₂. The final answer should have 3 sig figs to reflect the given value.
1 BaCl₂(aq) + Na₂SO₄(aq) ---> BaSO₄(s) + 2 NaCl(aq)
0.731 mole BaCl₂ 2 moles NaCl
--------------------------- x ------------------------- = 1.46 moles NaCl
1 mole BaCl₂
Answer:
All three are present
Explanation:
Addition of 6 M HCl would form precipitates of all the three cations, since the chlorides of these cations are insoluble: .
- Firstly, the solid produced is partially soluble in hot water. Remember that out of all the three solids, lead(II) choride is the most soluble. It would easily completely dissolve in hot water. This is how we separate it from the remaining precipitate. Therefore, we know that we have lead(II) cations present, as the two remaining chlorides are insoluble even at high temperatures.
- Secondly, addition of liquid ammonia would form a precipitate with silver: ; Silver hydroxide at higher temperatures decomposes into black silver oxide: .
- Thirdly, we also know we have in the mixture, since addition of potassium chromate produces a yellow precipitate: . The latter precipitate is yellow.