Which water sources contribute to a river system? Check all that apply.

Chemistry

2 answers:

garri49 [273]3 years ago

6 0

Ground water
Streams
Lakes

Rufina [12.5K]3 years ago

6 0

Explanation:

Larger networks of streams, lakes, rivers etc describe the river system as there are all part of a river's network.

Rivers, streams, and ground water move across the land and thus they contribute to the river system. Whereas a lake is defined as a large area of water which is surrounded by land and does not really contribute to river system.

Therefore, we can conclude that groundwater, rivers, and streams are the water sources that contribute to a river system.

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How many grams of MgCl2 (molar mass = 95.20 g/mol) will be formed from 25.6 mL of a 0.100 M HCL solution reacting with excess ma

lorasvet [3.4K]

The balanced equation for the above reaction is as follows;
Mg + 2HCl ---> MgCl₂ + H₂
stoichiometry of HCl to MgCl₂ is 2:1
we have been told that Mg is in excess therefore HCl is the limiting reactant
number of HCl moles reacted - 0.100 mol/L x 0.0256 L = 0.00256 mol
according to molar ratio, number of MgCl₂ moles formed - 0.00256/2
Therefore number of MgCl₂ moles formed - 0.00128 mol
mass of MgCl formed - 0.00128 mol x 95.20 g/mol = 0.122 g

3 0

3 years ago

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Draw the structure of the neutral product formed in the reaction of dimethyl malonate and methyl vinyl ketone.

Dmitriy789 [7]

Answer:

Explanation:

The reaction between dimethyl malonate which is an active methylene group with an (∝, β-unsaturated carbonyl compound) i.e methyl vinyl ketone is known as a Micheal Addition reaction. The reaction mechanism starts with the base attack on the β-carbon to remove the acidic ∝-hydrogens and form a carbanion. The carbanion formed(enolate ion) attacks the methyl vinyl ketone(i.e. a nucleophilic attack at the β-carbon) to give a Micheal addition product, this is followed by the protonation to give the neutral product.