Answer:
A. Bubbles formed
Explanation:
When a student added a piece of limestone to a solution of hydrochloric acid, bubbles are formed.
The bubbles are as a result of the CO2 gas that is formed.
Below is the reaction:
CaCO3+2HCl → CO2+H2O + Ca++ + 2Cl-
From the left hand side, we can see that the reaction is with limestone and hydrochloric acid. Their reaction forms carbon dioxide gas (CO2), water (H2O), dissolved calcium (Ca++) and dissolved chlorine (Cl-) on the right hand side.
With due observation, bubbles will be seen evolving from the reaction. These bubbles formed is the carbon dioxide gas which reveals that a reaction is taking place.
Answer:
Visitors is used as in "guests" who payed for a service...
I hope this helps.. :3
Answer:
some financial knowledge, a worldwide overall economic aspects, trade import/export overview, exceptional culture and be a polyglot.
Explanation:
Well, I don't see a set of options, but this may help. Logos is the use of Logic in an argument. Whichever answer uses logic will be the correct one.
Answer:
D. The character who tries to achieve a particular purpose or goal
and who is usually the main character
Explanation:
a protagonist is the principal character in a literary work