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.
Supporting sentences are there to provide examples to the topic sentence so the reader has something to go off of rather than just a bunch of facts.
A concluding paragraph can help to give the reader a closing so they know the material is coming to an end and it helps the reader sum up and recollect back on what they just read
a works cited page is there purely to give credit to the people that you have learned from so that the teacher or professor knows that you are not just pulling things from thin air, and to help ensure that the material that you presented is actually yours.
paraphrasing things can be risky because you are not actually using your own ideas and thoughts you are just taking what someone has said and rewording it while summarizing things is concluding what you have just read and telling the reader what you understood about the material.
and i' m not sure what you meant in 9.
Answer:
Please excuse me while I am on a phone call.
The one of the left with all the colored rings :•)
