It is <u>true</u> that ionic compounds are formed from atoms that have opposite charges.
<h3>What are ionic compounds?</h3>
Ionic compounds are chemical compounds made up of ions held together by electrostatic forces termed ionic bonding.
The ionic compound formed is neutrally charged but consists of positively charged ions called cations and negatively charged ions called anions.
For example, the sodium ions attract chloride ions and the chloride ion attracts sodium ions. The result is the formation of an ionic compound with cation Na+ and anion Cl– ions.
Therefore, it is true that an ionic compound is made up of positive and negative ions.
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Answer:
It changed from unsaturated to saturated solution
Explanation:
Before adding the spatula tip full amount, the solution was unsaturated, but as soon as the spatula tip full amount was added and couldn't dissolve, it became unsaturated because it could not dissolve any more solute having already dissolved it maximum number of solute
The least common multiples of 4, 10, and 16 is 80.
Answer:
c) bromthymol blue
Explanation:
An acidic solution has a pH value less than 7, while the pH is 7 for a neutral solution and grater than 7 for a basic solution.
Bromothymol blue is a pH indicator which is yellow in color when placed in an acid (pH under 7), the color is green in a neutral solution (pH of 7) and blue in an basic solution (pH over 7).
If bromthymol blue is added to a solution with an initial pH of 5.5 (acidic), the color would be yellow and as the pH changes to 8 (basic), the color changes to blue.
Explanation:
According to Clausius-Claperyon equation,
![ln (\frac{P_{2}}{P_{1}}) = \frac{-\text{heat of vaporization}}{R} \times [\frac{1}{T_{2}} - \frac{1}{T_{1}}]](https://tex.z-dn.net/?f=ln%20%28%5Cfrac%7BP_%7B2%7D%7D%7BP_%7B1%7D%7D%29%20%3D%20%5Cfrac%7B-%5Ctext%7Bheat%20of%20vaporization%7D%7D%7BR%7D%20%5Ctimes%20%5B%5Cfrac%7B1%7D%7BT_%7B2%7D%7D%20-%20%5Cfrac%7B1%7D%7BT_%7B1%7D%7D%5D)
The given data is as follows.
= (63.5 + 273) K
= 336.6 K
= (78 + 273) K
= 351 K
= 1 atm, 
= ?
Putting the given values into the above equation as follows.
![ln (\frac{1.75 atm}{1 atm}) = \frac{-\text{heat of vaporization}}{8.314 J/mol K} \times [\frac{1}{351 K} - \frac{1}{336.6 K}]](https://tex.z-dn.net/?f=ln%20%28%5Cfrac%7B1.75%20atm%7D%7B1%20atm%7D%29%20%3D%20%5Cfrac%7B-%5Ctext%7Bheat%20of%20vaporization%7D%7D%7B8.314%20J%2Fmol%20K%7D%20%5Ctimes%20%5B%5Cfrac%7B1%7D%7B351%20K%7D%20-%20%5Cfrac%7B1%7D%7B336.6%20K%7D%5D)
= 
= 
= 3813.1 J/mol
Thus, we can conclude that the heat of vaporization of ethanol is 3813.1 J/mol.
