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:
distress is the odd one out
Since this is an open question with no choices, I am answering with what I think will best fill in the blank. Note: I do not know exactly what answer they are looking for.
The best answer is: REM
REM is the stage of sleep where dreaming occurs. REM stands for Rapid Eye Movement. Exactly as the title says, REM sleep is characterized by fast back and forth movement of the eyes.
This question is incomplete. Here's the complete question.
Read Hound of the Baskervilles, by Sir Arthur Conan Doyle.
Which statement BEST summarizes the central idea of the text?
A
Dr. Mortimer has no idea what happened to his friend, Sir Baskerville, but is
being nosy and trying to get true information from Sherlock Holmes by
feeding Holmes a few facts.
B. Dr. Mortimer is suspicious that something ghostly or superstitious had a hand in the death of his friend. Sir Baskerville.
C. Dr. Mortimer does not want Sherlock Holmes to continue his investigation, so he is giving Sherlock Holmes false information without Holmes realizing it.
D
. Dr Mortimer is attempting to convince Sherlock Holmes that Sir Baskerville's butler, Barrymore, lied to the police because he had a hand in the death of Sir Baskerville
Answer: B. Dr. Mortimer is suspicious that something ghostly or superstitious had a hand in the death of his friend. Sir Baskerville.
Explanation:
Dr. James Mortimer is a family friend as well as the doctor of the Baskervilles, and the estate executor of the recently departed Sir Charles Baskerville. The Baskerville family is believed to be cursed by a sinister black hound. Mortimer thinks that Charles´death may have had something to do with that curse.
