The answer is SiO2
Since silicon has four valence electrons and each oxygen has 2, for every 1 silicon there must be 2 oxygen to fill in both element's outer shells satisfactorily. An alternative way to figure out the chemical formula is to simply swap the charges.
Silicon is a -4 and oxygen is a -2.
Oxygen's charge is brought down into subscript and set as the number of silicons in the chemical formula, making silicon Si2. Silicon's charge is brought down to make the number of oxygens in the chemical formula O4. The formula we have currently is Si2O4. Simplify it to get the empirical formula (divide by 2) and you get SiO2.
Answer:
The transformation that occurs when solid potassium nitrate dissolves in water:
![KNO_3(s)\rightarrow K^+(aq)+NO_3^{-} (aq)](https://tex.z-dn.net/?f=KNO_3%28s%29%5Crightarrow%20K%5E%2B%28aq%29%2BNO_3%5E%7B-%7D%20%28aq%29)
Explanation:
Electrolyte are those chemical compounds which oj dissolving water dissociates into ions and make the solution electrically conductive in nature.They are of two types:
- Strong electrolytes: Those compounds which get complete dissociated into ions.
- Weak electrolytes: Those compounds which get partially dissociated into ions.
When solid potassium potassium nitrate is dissolved in water it get dissociated into potassium ions and nitrate ions in an aqueous solution :
![KNO_3(s)\rightarrow K^+(aq)+NO_3^{-} (aq)](https://tex.z-dn.net/?f=KNO_3%28s%29%5Crightarrow%20K%5E%2B%28aq%29%2BNO_3%5E%7B-%7D%20%28aq%29)
You have to use the molar volume of gas which is 22.4L/mol at STP. To find the number of moles of from a given volume of gas at STP, you need to divide the given volume by 22.4L/mol.
44.4L/22.4L/mol=1.98mol of gas
Answer:
a. C₆H₅OH(aq)
Explanation:
The reaction of phenol with water is shown below as:-
![C_6H_5OH_{(aq)}+H_2O_{(l)}\rightarrow C_6H_5O^-_{(aq)}+H_3o^+_{(aq)}](https://tex.z-dn.net/?f=C_6H_5OH_%7B%28aq%29%7D%2BH_2O_%7B%28l%29%7D%5Crightarrow%20C_6H_5O%5E-_%7B%28aq%29%7D%2BH_3o%5E%2B_%7B%28aq%29%7D)
According to Arrhenius, The specie which furnish protons in solution is known as acid. In the above reaction, phenol,
acts as an acid by contributing a H⁺ ion to create H₃O⁺ in the chemical equation.
<u>a. C₆H₅OH(aq) is the answer</u>
Answer:
37.83 moles
Explanation:
moles = grams / formula weight = 454 grams / 12g/mol = 37.83 moles