An error in estimation could arise owing to;
1) Inaccurate measurement of the volumes of the solutions
2) When the reaction vessels are not properly cleaned
<h3>What is error in an experiment?</h3>
Error could occur in an experiment when values are misread. The error could be random error or a systematic error.
The major ways in which an error can occur in the estimation of concentration of acetic acid in the vinegar are;
1) Inaccurate measurement of the volumes of the solutions
2) When the reaction vessels are not properly cleaned
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Answer:
The question is incomplete. The structures were not added to the question. Find attached of the structure and the given answer.
Explanation:
See the attached file for explanation
Answer:
Valence electrons are the most important electrons to an atom.
Explanation:
They will determine many of the atoms traits since they are involved in bonding with other atoms.
Answer: 
Explanation:
Heat of reaction or enthalpy change is the energy released or absorbed during the course of the reaction.
It is calculated by subtracting the enthalpy of reactants from the enthalpy of products.

= enthalpy change = ?
= enthalpy of products
= enthalpy of reactants
For the given reaction :



Answer:
The correct answer is a. chemical bond. See the explanation below, please.
Explanation:
The resulting electrostatic interaction is called ionic bond between ions of opposite charge (one negative and one positive). This allows the attraction between both charges, constituting a chemical compound. Eg the Sodium (Na +) ion combines with the Chlorine (Cl-) ion forming Nacl (sodium chloride, known as table salt).