Answer:
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Answer: Option (a) is the correct answer.
Explanation:
The stream that flows during or after the rainfall is called an ephemeral stream. This stream occurs in areas where there is less rainfall or deficiency of moisture.
The stream that flows only in flat lands is called as river.
Mechanical weathering results in the breaking of rocks causes ice wedging.
Chemical weathering results in the change in molecular structure of rocks and soil.
Thus, it can be concluded that option (a) is the correct answer.
Answer:
9.72 grams of Br
Explanation:
This is the salt: MgBr₂ (Magnesium bromide)
1 mol of MgBr₂ has 1 mol of Mg and 2 mol of Br
Molar mass MgBr₂ → 184.11 g/m
So the rule of three will be:
184.11 g of salt have 2 moles of Br
11.2 g of salt have (11.2 . 2)/184.11 = 0.122 moles of Br.
Molar mass Br = 79.9 g/m
Mol . molar mass = mass → 0.122 m . 79.9 g/m = 9.72 g
