The hotter the temperature the faster the molecules moves, and the colder the temperatures the slower the molecules moves. Hope this helps
Answer:
The compounds in the samples will leach into the pool of developing solvent resulting in poor resolution.
Explanation:
The aim of thin layer chromatography is the separation of a mixture. Usually, the stationary phase is spotted with the mixture. A mark is made with a pencil at the point to be spotted.
It is necessary to note that the solvent must be below the spot where the mixture is. This is because, if the solvent is above the spot of the mixture to be separated, the components of the mixture will dissolve away in the solvent resolution in poor separation. This is exactly what will happen when the sample is spotted at 1.0 cm above the bottom when the solvent is 1.2 cm above the bottom.
Answer:
transition metals have more than 1 oxidation numbers
Answer:In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure, that occurs naturally in pure form.
Explanation:
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Answer:</h3>
CaCl₂. 3H₂O
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Explanation:</h3>
We are given;
- Mass of calcium chloride hydrate as 2.246 g
- Mass of water of crystallization as 0.728 g
We are required to determine the formula of the hydrate;
First; we determine the mass of the anhydrous salt
Mass of anhydrous Calcium chloride = Mass of hydrate - mass of water
= 2.246 g - 0.728 g
= 1.518 g
Second; determine the moles of anhydrous salt and water
Moles = mass ÷ molar mass
Moles of anhydrous salt
Molar mass of CaCl₂ = 110.98 g/mol
Moles of CaCl₂ = 1.518 g ÷ 110.98 g/mol
= 0.0137 moles
Moles of water
Molar mass of water = 18.02 g/mol
Moles of water = 0.728 g ÷ 18.02 g/mol
= 0.0404 moles
Third; we determine the whole number mole ratio of anhydrous salt to water
CaCl₂ : H₂O
0.0137 moles : 0.0404 moles
0.0137/0.0137 : 0.0404/0.0137
1 : 2.95
1 : 3
Therefore, the formula of the hydrate is CaCl₂. 3H₂O
