Answer:
i) Upwards delivery
ii) Downwards delivery
Explanation:
The methods used in the collection of gases are quite different depending on the state of the gas. The solubility and density of gases are the factors that determine the method of collection to be used.
Upwards delivery is used to collect gases that are soluble in water and lighter compared to air. Examples of these kind of gases include; Cl2 and SO2
Downwards delivery is used to collect gases that are soluble in water and denser than air. An example of this kind of gas is ammonia gas, NH4.
<span>Hydrolysis is the breaking down of bonds when water is involved in the reaction. </span>The net reaction for the hydrolysis of water yields hydrogen ions and hydroxide ions because these ions are dissociated upon solvolysis. This means they are completely dissolved and transformed into ions thereafter.
The reactants that would lead to a spontaneous reaction
are Mn2+ and Al3+. Al and Mn
are not because they are stable reactants. Mn and Al3+ are not because Mn is stable. Mn2+ and Al are
not because Al is stable.
<u>Answer:</u> The density of NaCl solution is 3.930 g/mL
<u>Explanation:</u>
We are given:
Mass of cylinder, 
= 21.577 g
Mass of NaCl and cylinder combined, M = 39.664 g
Mass of NaCl, 
= 
To calculate density of a substance, we use the equation:
We are given:
Mass of NaCl = 18.087 g
Volume of NaCl solution = 4.602 mL
Putting values in above equation, we get:
Hence, the density of NaCl solution is 3.930 g/mL
