Astudent combined two colorless aqueous solutions. one of the solutions contained na2co3 as the solute and the other contained hcl. the chemical reaction that took place is represented by the equation above. what experimental result would be evidence that a chemical reaction took place when the solutions were combined?

So the evidence that a chemical reaction took place: the formation of bubbles

In the matter of a substance, there is a process of change.

2 changes occur in the mater: physical changes and chemical changes

Classification uses the principle of the initial and final state of the substance.

Physical changes are changes in the matter which in the process do not cause new substances. So the properties of the particles remain the same.

Generally, the physical changes that occur are changes in shape / size and changes due to heating, or changes in volume

Example: melting, freezing, boiling

Chemical changes are changes in the process that produce new substances that are different from the initial / forming substances. Chemical changes are usually known as chemical reactions. So there are products / reactions and reactants and there is a change in the molecule / particle

Chemical reactions can be known from the results of the reaction after the two solutions / compounds are mixed.

This chemical change can be :

New colors emerge from mixing 2 solutions

We use the Solubility Rules to determine whether a precipitation reaction will occur or not

Occurs in the exothermic or endothermic process

bubbles occur because the gas in the solution that comes out

The reaction between Na₂CO₃ and HCl:

2HCl + Na₂CO₃ -> 2NaCl + CO₂ + H₂O

From the reaction results obtained NaCl and CO₂

NaCl itself is a soluble compound salt that may not be visible after mixing occurs, while CO₂ is a gas that can be seen from the formation of bubbles in the solution

A double-replacement equation

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solute attractions

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substance loses electrons in a chemical reaction

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c (diamond),

sio2 (quartz)