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Fred Senese's user avatar
Fred Senese's user avatar
Fred Senese's user avatar
Fred Senese
  • Member for 9 years, 4 months
  • Last seen more than 4 years ago
45 votes

Is toothpaste solid or liquid?

34 votes

Are there any good examples of commonly ingested molecules that contain particular toxic individual elements?

23 votes
Accepted

Why would 1kW power supplies fail around Nitric acid (HNO3) gas?

22 votes
Accepted

What causes the really bad smell of rotten potatoes?

22 votes
Accepted

Are matrices a good way to do stoichiometry?

19 votes
Accepted

Formula of entropy change

17 votes
Accepted

Why Ca 2+ and not Ca +2

17 votes
Accepted

Why is beryllium transparent to x-rays?

16 votes

Can magnetic fields affect a chemical reaction?

14 votes

Does chemistry need machine learning?

14 votes
Accepted

Why can't alcohols turn blue litmus red?

13 votes
Accepted

How pure NaCl is typical table salt? How is it purified?

12 votes
Accepted

Temperature of an atom

11 votes
Accepted

Whats the difference between entropy and the (dis)order of a system?

10 votes

Why is it obligatory to cool down the container of a sample to measure its mass in a lab?

9 votes

What is the Ka of OH- and Kb of H3O+?

9 votes
Accepted

Why is aluminium carbide bent?

8 votes

Adding lemon to lentils changes color from black to pink, why?

8 votes

Would there be a difference if deuterium is embedded instead of protium (regular hydrogen) in acids?

7 votes
Accepted

Polyprotic acids and bases

7 votes
Accepted

How are pencil marks "adhered" to the paper?

7 votes
Accepted

Why does potassium form peroxides but sodium does not?

7 votes
Accepted

Actinides and Lanthanides group

7 votes

How does VSEPR theory explain the formation of different bond angles in PClâ‚…?

7 votes
Accepted

Enthalpy (H) formula: what is the pressure volume product

6 votes

Why 6.023x10^23 is not written as 6023x10^20?

6 votes
Accepted

For a system to undergo a spontaneous change at constant temperature and pressure the Gibbs free energy must decrease, but how?

6 votes

Incomplete Combustion products

6 votes
Accepted

Why is it not possible to determine the rate constant this way?

5 votes

Why is the rate of disappearance negative?