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Tasya [4]
3 years ago
7

which statement is true about the elements in a compound? They maintain their chemical properties. They are composed of many mix

tures. They can be separated by physical methods. They can be sperarated by chemical methods.​
Chemistry
2 answers:
gizmo_the_mogwai [7]3 years ago
6 0

Answer:

they can be separated by chemical methods

Explanation:

follow me

JulsSmile [24]3 years ago
3 0

Answer:

They can be separated by chemical methods

Explanation:

The definition of Compounds states: a thing that is composed of two or more separate elements; a mixture.

Compounds are typically produced from chemical reactions and are classified by the different types of bonds such as Ionic, Covalent, and Metallic bonds.

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Answer:

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Explanation:

Let's introduce a strategy needed to solve any similar problem like this:

  • Apply the mass conservation law (assuming that this reaction goes 100 % to completion): the total mass of the reactants should be equal to the total mass of the products.

Based on the mass conservation law, we need to identify the reactants first. Our only reactant is sodium bicarbonate, so the total mass of the reactants is:

m_r=m_{NaHCO_3}=2.36 g

We have two products formed, sodium carbonate and carbonic acid. This implies that the total mass of the products is:

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Substitute the given variables:

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Rearrange for the mass of carbonic acid:

m_{H_2CO_3}=m_{NaHCO_3}-m_{Na_2CO_3}=2.36 g - 1.57 g=0.79 g

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