Explanation:
X = Group 1 metal
Y = Group 7 Non metal
The dots basically signifies the group.
Metal loses electrons and non metal gains electron. The valency of X is 1 and that of Y is 7.
X atom loses one electron and Y atom gains one electron.
The bond that forms between a metal and a non metal is an ionic bond.
Hello!
It's actually easy to add a half drop of NaOH from the buret, you'll only need to be careful.
For doing that, you'll need to first open the flow of the buret until a little drop appears, and close it before it falls to the titrating flask. Then, you'll need to rinse the tip of the buret with deionized water to make the half drop fall into the titrating flask.
Don't worry about diluting your sample with the deionized water, since you are titrating the total moles of your analyte in the solution, and those won't change with concentration.
Have a nice day!
Since there is no "new" chemicals made during this process, it is considered a physical change. Distillation is a process of separating dissolved solids or liquids with different boiling points without chemically changing anything.
Color change, formation if a new substance or altering molecular structure are all general signs of chemical change.
Therefore, the last answer choice looks like the best answer.
Hope that helps!
The density of an object determines whether it will float or sink in another substance. An object will float if it is less dense than the liquid it is placed in. An object will sink if it is more dense than the liquid it is placed in.